TNY290KG-TL [POWERINT]
Energy-Efficient, Off-Line Switcher With Line Compensated Overload Power; 高能效，离线式开关本着补偿过载功率
| 型号： | TNY290KG-TL |
| 厂家： | 
Power Integrations |
| 描述： | Energy-Efficient, Off-Line Switcher With Line Compensated Overload Power |
| 文件： | 总26页 (文件大小：2282K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TNY284-290
™
TinySwitch-4 Family
Energy-Efficient, Off-Line Switcher With
Line Compensated Overload Power
Product Highlights
+
+
Lowest System Cost with Enhanced Flexibility
•ꢀ 72ꢀ V rated MOSFET
DC
Output
•ꢀ Increases BV de-rating margin
Wide-Range
High-Voltage
DC Input
•ꢀ Line compensated overload power – no additional components
•ꢀ Dramatically reduces max overload variation over universal
input voltage range
•ꢀ ±ꢀ5 turn on UV threshold: line voltage sense with single
external resistor
D
S
EN/UV
BP/M
TinySwitch-4
•ꢀ Simple ON/OFF control, no loop compensation needed
•ꢀ Selectable current limit through BP/M capacitor value
•ꢀ Higher current limit extends peak power or, in open frame
applications, maximum continuous power
•ꢀ Lower current limit improves efficiency in enclosed
adapters/chargers
PI-6578-101411
Figure 1. Typical Standby Application.
•ꢀ Allows optimum TinySwitch-4 choice by swapping devices
with no other circuit redesign
•ꢀ Tight I2f parameter tolerance reduces system cost
•ꢀ Maximizes MOSFET and magnetics utilization
•ꢀ ON-time extension – extends low-line regulation range/hold-up
time to reduce input bulk capacitance
SO-8C (D Package)
DIP-8C (P Package)
eSOP-12B (K Package)
Figure 2. Package Options.
•ꢀ Self-biased: no bias winding or bias components
•ꢀ Frequency jittering reduces EMI filter costs
•ꢀ Pin-out simplifies heat sinking to the PCB
•ꢀ SOURCE pins are electrically quiet for low EMII
Output Power Table
230 VAC 1ꢀ5
8ꢀ-26ꢀ VAC
Product3
Peak or
Open
Peak or
Adapter1
Adapter1
Open
Frame2
Frame2
Enhanced Safety and Reliability Features
•ꢀ Accurate hysteretic thermal shutdown protection with auto-
matic recovery eliminates need for manual reset
•ꢀ Auto-restart delivers <35 of maximum power in short-circuit
and open loop fault conditions
•ꢀ Output overvoltage shutdown with optional Zener
•ꢀ Fast AC reset with optional UV external resistor
•ꢀ Very low component count enhances reliability and enables
single-sided printed circuit board layout
•ꢀ High bandwidth provides fast turn-on with no overshoot and
excellent transient load response
•ꢀ Extended creepage between DRAIN and all other pins improves
field reliability
TNY284P/D/K
TNY285P/D
TNY285K
TNY286P/D
TNY286K
TNY287D
TNY287P
TNY287K
TNY288P
TNY288K
TNY289P
TNY289K
TNY290P
TNY290K
6 W
8.ꢀ W
11 W
10 W
13.ꢀ W
11.ꢀ W
13 W
18 W
16 W
23 W
18 W
2ꢀ W
20 W
28 W
11 W
1ꢀ W
ꢀ W
6 W
8.ꢀ W
11.ꢀ W
11.ꢀ W
1ꢀ W
1ꢀ W
7.ꢀ W
7 W
19 W
19 W
9.ꢀ W
7 W
1ꢀ W
23.ꢀ W
23.ꢀ W
23.ꢀ W
28 W
18 W
8 W
18 W
11 W
10 W
14.ꢀ W
12 W
17 W
14 W
20 W
16 W
21.ꢀ W
21.ꢀ W
2ꢀ W
28 W
EcoSmart™– Extremely Energy Efficient
•ꢀ Easily meets all global energy efficiency regulations
•ꢀ No-load <30 mW with bias winding, <1ꢀ0 mW at 26ꢀ VAC
without bias winding
•ꢀ ON/OFF control provides constant efficiency down to very light
loads – ideal for mandatory CEC regulations and EuP standby
requirements
32 W
32 W
2ꢀ W
36.ꢀ W
36.ꢀ W
28.ꢀ W
28.ꢀ W
Table 1. Output Power Table.
Notes:
1. Minimum continuous power in a typical non-ventilated enclosed adapter
measured at +ꢀ0 °C ambient. Use of an external heat sink will increase power
capability.
2. Minimum peak power capability in any design or minimum continuous power in
an open frame design (see Key Applications Considerations).
3. Packages: D: SO-8C, P: DIP-8C, K: eSOP-12B. See Part Ordering Information.
Applications
•ꢀ PC Standby and other auxiliary supplies
•ꢀ DVD/PVR and other low power set top decoders
•ꢀ Supplies for appliances, industrial systems, metering, etc
•ꢀ Chargers/adapters for cell/cordless phones, PDAs, digital
cameras, MP3/portable audio, shavers, etc.
www.powerint.com
September 2012
TNY284-290
BYPASS/
MULTI-FUNCTION
(BP/M)
DRAIN
(D)
REGULATOR
5.85 V
LINE UNDER-VOLTAGE
115 μA
25 μA
FAULT
PRESENT
BYPASS PIN
UNDER-VOLTAGE
+
-
AUTO-
RESTART
COUNTER
BYPASS
CAPACITOR
SELECT AND
CURRENT
LIMIT STATE
MACHINE
5.85 V
4.9 V
VILIMIT
LINE
RESET
COMPENSATION
6.4 V
CURRENT LIMIT
COMPARATOR
-
ENABLE
1.0 V + VT
1.0 V
+
JITTER
CLOCK
THERMAL
SHUTDOWN
DC
MAX
OSCILLATOR
S
R
Q
Q
ENABLE/
UNDER-
VOLTAGE
(EN/UV)
LEADING
EDGE
OVP
BLANKING
LATCH
SOURCE
(S)
PI-6639-113011
Figure 3. Functional Block Diagram.
Pin Functional Description
D Package (SO-8C)
DRAIN (D) Pin:
EN/UV 1
BP/M 2
8 S
This pin is the power MOSFET drain connection. It provides
internal operating current for both start-up and steady-state
operation.
7 S
6 S
5 S
P Package (DIP-8C)
BYPASS/MULTI-FUNCTION (BP/M) Pin:
D 4
This pin has multiple functions:
•ꢀ It is the connection point for an external bypass capacitor for
the internally generated ꢀ.8ꢀ V supply.
EN/UV 1
BP/M 2
8 S
7 S
Exposed Pad (On Bottom)
Internally Connected to
SOURCE Pin
•ꢀ It is a mode selector for the current limit value, depending on
the value of the capacitance added. Use of a 0.1 μF capaci-
tor results in the standard current limit value. Use of a 1 μF
capacitor results in the current limit being reduced to that of
the next smaller device size. Use of a 10 μF capacitor results
in the current limit being increased to that of the next larger
device size for TNY28ꢀ-290.
•ꢀ It provides a shutdown function. When the current into the
bypass pin exceeds ISD, the device latches off until the BP/M
voltage drops below 4.9 V, during a power-down or, when the
UV function is employed with external resistors connected to
the BP/UV pin, by taking the UV/EN pin current below IUV
minus the reset hysteresis (Typ. 18.7ꢀ μA). This can be used
6 S
5 S
K Package
(eSOP-12B)
D 4
EN/UV 1
12 S
11 S
10 S
9 S
BP/M 2
N/C 3
N/C 4
8 S
D 6
7 S
PI-6577-053112
Figure 4. Pin Configuration.
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TNY284-290
to provide an output overvoltage function with a Zener
connected from the BYPASS/MULTI-FUNCTIONAL pin to a
bias winding supply.
Oscillator
The typical oscillator frequency is internally set to an average of
132 kHz. Two signals are generated from the oscillator: the
maximum duty cycle signal (DCMAX) and the clock signal that
indicates the beginning of each cycle.
ENABLE/UNDERVOLTAGE (EN/UV) Pin:
This pin has dual functions: enable input and line undervoltage
sense. During normal operation, switching of the power
MOSFET is controlled by this pin. MOSFET switching is
terminated when a current greater than a threshold current is
drawn from this pin. Switching resumes when the current being
pulled from the pin drops to less than a threshold current. A
modulation of the threshold current reduces group pulsing. The
threshold current is between 7ꢀ μA and 11ꢀ μA.
The oscillator incorporates circuitry that introduces a small
amount of frequency jitter, typically 8 kHz peak-to-peak, to
minimize EMI emission. The modulation rate of the frequency
jitter is set to 1 kHz to optimize EMI reduction for both average
and quasi-peak emissions. The frequency jitter should be
measured with the oscilloscope triggered at the falling edge of
the DRAIN waveform. The waveform in Figure ꢀ illustrates the
frequency jitter.
The ENABLE/UNDERVOLTAGE pin also senses line
undervoltage conditions through an external resistor connected
to the DC line voltage. If there is no external resistor connected
to this pin, TinySwitch-4 detects its absence and disables the
line undervoltage function.
Enable Input and Current Limit State Machine
The enable input circuit at the ENABLE/UNDERVOLTAGE pin
consists of a low impedance source follower output set at 1.2 V.
The current through the source follower is limited to 11ꢀ μA.
When the current out of this pin exceeds the threshold current,
a low logic level (disable) is generated at the output of the
enable circuit, until the current out of this pin is reduced to less
than the threshold current. This enable circuit output is
sampled at the beginning of each cycle on the rising edge of the
clock signal. If high, the power MOSFET is turned on for that
cycle (enabled). If low, the power MOSFET remains off
(disabled). Since the sampling is done only at the beginning of
each cycle, subsequent changes in the ENABLE/UNDER-
VOLTAGE pin voltage or current during the remainder of the
cycle are ignored.
SOURCE (S) Pin:
This pin is internally connected to the output MOSFET source
for high-voltage power return and control circuit common.
TinySwitch-4 Functional Description
TinySwitch-4 combines a high-voltage power MOSFET switch
with a power supply controller in one device. Unlike conventional
PWM (pulse width modulator) controllers, it uses a simple
ON/OFF control to regulate the output voltage.
The controller consists of an oscillator, enable circuit (sense and
logic), current limit state machine, ꢀ.8ꢀ V regulator, BYPASS/
MULTI-FUNCTION pin undervoltage, overvoltage circuit, and
current limit selection circuitry, over-temperature protection,
current limit circuit, leading edge blanking, and a 72ꢀ V power
MOSFET. TinySwitch-4 incorporates additional circuitry for line
undervoltage sense, auto-restart, adaptive switching cycle
on-time extension, and frequency jitter. Figure 3 shows the
functional block diagram with the most important features.
The current limit state machine reduces the current limit by
discrete amounts at light loads when TinySwitch-4 is likely to
switch in the audible frequency range. The lower current limit
raises the effective switching frequency above the audio range
and reduces the transformer flux density, including the
associated audible noise. The state machine monitors the
sequence of enable events to determine the load condition and
adjusts the current limit level accordingly in discrete amounts.
Under most operating conditions (except when close to
no-load), the low impedance of the source follower keeps the
voltage on the ENABLE/UNDERVOLTAGE pin from going much
below 1.2 V in the disabled state. This improves the response
time of the optocoupler that is usually connected to this pin.
600
500
VDRAIN
400
5.85 V Regulator and 6.4 V Shunt Voltage Clamp
300
The ꢀ.8ꢀ V regulator charges the bypass capacitor connected
to the BYPASS pin to ꢀ.8ꢀ V by drawing a current from the
voltage on the DRAIN pin whenever the MOSFET is off. The
BYPASS/MULTI-FUNCTION pin is the internal supply voltage
node. When the MOSFET is on, the device operates from the
energy stored in the bypass capacitor. Extremely low power
consumption of the internal circuitry allows TinySwitch-4 to
operate continuously from current it takes from the DRAIN pin.
A bypass capacitor value of 0.1 μF is sufficient for both high
frequency decoupling and energy storage.
200
100
0
136 kHz
128 kHz
0
5
10
In addition, there is a 6.4 V shunt regulator clamping the
BYPASS/MULTI-FUNCTION pin at 6.4 V when current is
provided to the BYPASS/MULTI-FUNCTION pin through an
Time (µs)
Figure 5. Frequency Jitter.
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Rev. A 09/12
TNY284-290
external resistor. This facilitates powering of TinySwitch-4
externally through a bias winding to decrease the no-load
consumption to well below ꢀ0 mW.
is pulled low. If the ENABLE/UNDERVOLTAGE pin is not pulled
low for 64 ms, the power MOSFET switching is normally
disabled for 2.ꢀ seconds (except in the case of line undervoltage
condition, in which case it is disabled until the condition is
removed). The auto-restart alternately enables and disables the
switching of the power MOSFET until the fault condition is
removed. Figure 6 illustrates auto-restart circuit operation in the
presence of an output short-circuit.
BYPASS/MULTI-FUNCTION Pin Undervoltage
The BYPASS/MULTI-FUNCTION pin undervoltage circuitry
disables the power MOSFET when the BYPASS/MULTI-
FUNCTION pin voltage drops below 4.9 V in steady state
operation. Once the BYPASS/MULTI-FUNCTION pin voltage
drops below 4.9 V in steady state operation, it must rise back to
ꢀ.8ꢀ V to enable (turn-on) the power MOSFET.
In the event of a line undervoltage condition, the switching of
the power MOSFET is disabled beyond its normal 2.ꢀ seconds
until the line undervoltage condition ends.
Over Temperature Protection
The thermal shutdown circuitry senses the die temperature.
The threshold is typically set at 142 °C with 7ꢀ °C hysteresis.
When the die temperature rises above this threshold the power
MOSFET is disabled and remains disabled until the die
temperature falls by 7ꢀ °C, at which point it is re-enabled. A
large hysteresis of 7ꢀ °C (typical) is provided to prevent over-
heating of the PC board due to a continuous fault condition.
Adaptive Switching Cycle On-Time Extension
Adaptive switching cycle on-time extension keeps the cycle on
until current limit is reached, instead of prematurely terminating
after the DCMAX signal goes low. This feature reduces the
minimum input voltage required to maintain regulation, extending
hold-up time and minimizing the size of bulk capacitor required.
The on-time extension is disabled during the start-up of the
power supply, until the power supply output reaches regulation.
Current Limit
The current limit circuit senses the current in the power
MOSFET. When this current exceeds the internal threshold
(ILIMIT), the power MOSFET is turned off for the remainder of that
cycle. The current limit state machine reduces the current limit
threshold by discrete amounts under medium and light loads.
Line Undervoltage Sense Circuit
The DC line voltage can be monitored by connecting an
external resistor from the DC line to the ENABLE/
UNDERVOLTAGE pin. During power-up or when the switching
of the power MOSFET is disabled in auto-restart, the current
into the ENABLE/UNDERVOLTAGE pin must exceed 2ꢀ μA to
initiate switching of the power MOSFET. During power-up, this
is accomplished by holding the BYPASS/MULTI-FUNCTION pin
to 4.9 V while the line undervoltage condition exists. The
BYPASS/MULTI-FUNCTION pin then rises from 4.9 V to ꢀ.8ꢀ V
when the line undervoltage condition goes away. When the
switching of the power MOSFET is disabled in auto-restart
mode and a line undervoltage condition exists, the auto-restart
counter is stopped. This stretches the disable time beyond its
normal 2.ꢀ seconds until the line undervoltage condition ends.
The leading edge blanking circuit inhibits the current limit
comparator for a short time (tLEB) after the power MOSFET is
turned on. This leading edge blanking time has been set so
that current spikes caused by capacitance and secondary-side
rectifier reverse recovery time will not cause premature
termination of the switching pulse.
Auto-Restart
In the event of a fault condition such as output overload, output
short-circuit, or an open loop condition, TinySwitch-4 enters
into auto-restart operation. An internal counter clocked by the
oscillator is reset every time the ENABLE/UNDERVOLTAGE pin
The line undervoltage circuit also detects when there is no
external resistor connected to the ENABLE/UNDERVOLTAGE
pin (less than ~2 μA into the pin). In this case the line
undervoltage function is disabled.
300
TinySwitch-4 Operation
TinySwitch-4 devices operate in the current limit mode. When
enabled, the oscillator turns the power MOSFET on at the
beginning of each cycle. The MOSFET is turned off when the
current ramps up to the current limit or when the DCMAX limit is
reached. Since the highest current limit level and frequency of
a TinySwitch-4 design are constant, the power delivered to the
load is proportional to the primary inductance of the transformer
and peak primary current squared. Hence, designing the
supply involves calculating the primary inductance of the
transformer for the maximum output power required. If the
TinySwitch-4 is appropriately chosen for the power level, the
current in the calculated inductance will ramp up to current limit
before the DCMAX limit is reached.
200
100
0
10
5
0
2500
5000
0
Time (ms)
Figure 6. Auto-Restart Operation.
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TNY284-290
Enable Function
TinySwitch-4 senses the ENABLE/UNDERVOLTAGE pin to
determine whether or not to proceed with the next switching
cycle. The sequence of cycles is used to determine the current
limit. Once a cycle is started, it always completes the cycle
(even when the ENABLE/UNDERVOLTAGE pin changes state
half way through the cycle). This operation results in a power
supply in which the output voltage ripple is determined by the
output capacitor, amount of energy per switch cycle and the
delay of the feedback.
The ENABLE/UNDERVOLTAGE pin signal is generated on the
secondary by comparing the power supply output voltage with
a reference voltage. The ENABLE/UNDERVOLTAGE pin signal
is high when the power supply output voltage is less than the
reference voltage. In a typical implementation, the ENABLE/
UNDERVOLTAGE pin is driven by an optocoupler. The collector
of the optocoupler transistor is connected to the ENABLE/
UNDERVOLTAGE pin and the emitter is connected to the
SOURCE pin. The optocoupler LED is connected in series with
V
V
EN
EN
CLOCK
CLOCK
DC
DC
MAX
MAX
I
I
DRAIN
DRAIN
V
V
DRAIN
DRAIN
PI-2749-082305
PI-2667-082305
Figure 7. Operation at Near Maximum Loading.
Figure 8. Operation at Moderately Heavy Loading.
V
V
EN
EN
CLOCK
CLOCK
DC
DC
MAX
MAX
I
I
DRAIN
DRAIN
V
V
DRAIN
DRAIN
PI-2661-082305
PI-2377-082305
Figure 10. Operation at Very Light Load.
Figure 9. Operation at Medium Loading.
5
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Rev. A 09/12
TNY284-290
a Zener diode across the DC output voltage to be regulated.
When the output voltage exceeds the target regulation voltage
level (optocoupler LED voltage drop plus Zener voltage), the
optocoupler LED will start to conduct, pulling the ENABLE/
UNDERVOLTAGE pin low. The Zener diode can be replaced by
a TL431 reference circuit for improved accuracy.
At near maximum load, TinySwitch-4 will conduct during nearly
all of its clock cycles (Figure 7). At slightly lower load, it will
“skip” additional cycles in order to maintain voltage regulation at
the power supply output (Figure 8). At medium loads, cycles
will be skipped and the current limit will be reduced (Figure 9).
At very light loads, the current limit will be reduced even further
(Figure 10). Only a small percentage of cycles will occur to
satisfy the power consumption of the power supply.
ON/OFF Operation with Current Limit State Machine
The internal clock of the TinySwitch-4 runs all the time. At the
beginning of each clock cycle, it samples the ENABLE/
UNDERVOLTAGE pin to decide whether or not to implement a
switch cycle, and based on the sequence of samples over
multiple cycles, it determines the appropriate current limit. At
high loads, the state machine sets the current limit to its highest
value. At lighter loads, the state machine sets the current limit
to reduced values.
The response time of the ON/OFF control scheme is very fast
compared to PWM control. This provides tight regulation and
excellent transient response.
Power-Up/Down
The TinySwitch-4 requires only a 0.1 μF capacitor on the
BYPASS/MULTI-FUNCTION pin to operate with standard
200
200
V
V
100
100
DC-INPUT
DC-INPUT
0
0
10
10
V
V
5
5
BYPASS
BYPASS
0
0
400
400
200
200
V
DRAIN
0
0
1
2
0
1
2
0
Time (ms)
Time (ms)
Figure 12. Power-Up without Optional External UV Resistor
Connected to EN/UV Pin.
Figure 11. Power-Up with Optional External UV Resistor (4 MW)
Connected to EN/UV Pin.
200
200
V
100
0
100
0
DC-INPUT
400
300
400
300
200
100
0
V
200
100
0
DRAIN
2.5
5
0
.5
1
0
Time (s)
Time (s)
Figure 14. Slow Power-Down Timing with Optional External (4 MW)
Figure 13. Normal Power-Down Timing (without UV).
UV Resistor Connected to EN/UV Pin.
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Rev. A 09/12
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TNY284-290
current limit. Because of its small size, the time to charge this
capacitor is kept to an absolute minimum, typically 0.6 ms. The
time to charge will vary in proportion to the BYPASS/MULTI-
FUNCTION pin capacitor value when selecting different current
limits. Due to the high bandwidth of the ON/OFF feedback,
there is no overshoot at the power supply output. When an
external resistor (4 MW) is connected from the positive DC input
to the ENABLE/UNDERVOLTAGE pin, the power MOSFET
switching will be delayed during power-up until the DC line
voltage exceeds the threshold (100 V). Figures 11 and 12 show
the power-up timing waveform in applications with and without
an external resistor (4 MW) connected to the ENABLE/
UNDERVOLTAGE pin. Under start-up and overload conditions,
when the conduction time is less than 400 ns, the device
reduces the switching frequency to maintain control of the peak
drain current.
and associated components. Secondly, for battery charger
applications, the current-voltage characteristic often allows the
output voltage to fall close to 0 V while still delivering power.
TinySwitch-4 accomplishes this without a forward bias winding
and its many associated components. For applications that
require very low no-load power consumption (ꢀ0 mW), a resistor
from a bias winding to the BYPASS/MULTI-FUNCTION pin can
provide the power to the chip. The minimum recommended
current supplied is 1 mA. The BYPASS/MULTI-FUNCTION pin
in this case will be clamped at 6.4 V. This method will eliminate
the power draw from the DRAIN pin, thereby reducing the
no-load power consumption and improving full-load efficiency.
Current Limit Operation
Each switching cycle is terminated when the DRAIN current
reaches the current limit of the device. Current limit operation
provides good line ripple rejection and relatively constant power
delivery independent of input voltage.
During power-down, when an external resistor is used, the
power MOSFET will switch for 64 ms after the output loses
regulation. The power MOSFET will then remain off without any
glitches since the undervoltage function prohibits restart when
the line voltage is low.
BYPASS/MULTI-FUNCTION Pin Capacitor
The BYPASS/MULTI-FUNCTION pin can use a ceramic
capacitor as small as 0.1 μF for decoupling the internal power
supply of the device. A larger capacitor size can be used to
adjust the current limit. For TNY28ꢀ-290, a 1 μF BYPASS/
MULTI-FUNCTIONAL pin capacitor will select a lower current
limit equal to the standard current limit of the next smaller
device and a 10 μF BYPASS/MULTI-FUNCTIONAL pin capacitor
will select a higher current limit equal to the standard current
limit of the next larger device. The higher current limit level of
the TNY290 is set to 8ꢀ0 mA typical. The TNY284 MOSFET
does not have the capability for increased current limit so this
feature is not available in this device.
Figure 13 illustrates a typical power-down timing waveform.
Figure 14 illustrates a very slow power-down timing waveform
as in standby applications. The external resistor (4 MW) is
connected to the ENABLE/UNDERVOLTAGE pin in this case to
prevent unwanted restarts.
No bias winding is needed to provide power to the chip
because it draws the power directly from the DRAIN pin (see
Functional Description). This has two main benefits. First, for a
nominal application, this eliminates the cost of a bias winding
40
TNY290
TNY280
35
30
25
20
85 100 115 130 145 160 175 190 205 220 235 250 265
Input Voltage (VAC)
Figure 15. Comparison of Maximum Overpower for TinySwitch-4 and
TinySwitch-III as a Function of Input Voltage (Data Collected from
RDK-295 20 W Reference Design).
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Rev. A 09/12
TNY284-290
R3
4.7
C5
Ω
1.5 nF
C13
1/2 W 100 V
2.2 nF
250 VAC
C6, C7
1500 µF
10 V
C8
1000 µF
10 V
5 V, 4 A
RTN
1
9,10
L2
2.2 µH
D4
C3
2.2 nF
1 kV
STPS30L60CT
VR1
P6KE150A
BR1
2KBP10M
1000 V
7,8
4
R1
22
Ω
D3
R2
C2
1/2 W
1N4937
8.2
Ω
68 µF
R6
3
5
450 V
R9
47
D1
10 kΩ
T1
EE22
Ω
UF4006-E3
C4
100 µF
50 V
VR2
1N5254
27 V
1%
R4
30 k
1/8 W
R12
2 M
R13
2 M
Ω
Ω
Ω
R15
L1
10 mH
1.5 M
Ω
D
S
1/8 W
EN/UV
BP/M
TinySwitch-4
U1
TNY290PG
R8
RT1
1 k
Ω
6
Ω
1/8 W
U3
C10
R14
PC817
C1
47 nF
100 V
3.3 k
Ω
100 nF
C9
C16
100 nF
100 V
1/8 W
F1
5 A
275 VAC
10 µF
16 V
C11
2.2
µF
R7
U2
TL431
50 V
10 k
Ω
90 - 295
VAC
1%
PI-6559-062012
In a PC standby application input stage
will be part of main power supply input
Figure 16. TNY290PG, 5 V, 4 A Universal Input Power Supply.
Applications Example
cycles decreases, lowering the effective switching frequency
and scaling switching losses with load. This provides almost
constant efficiency down to very light loads, ideal for meeting
energy efficiency requirements.
The circuit shown in Figure 16 is a low cost, high efficiency,
flyback power supply designed for ꢀ V, 4 A output from
universal input using the TNY290PG.
As the TinySwitch-4 devices are completely self-powered, there
is no requirement for an auxiliary or bias winding on the
transformer. However by adding a bias winding, the output
overvoltage protection feature can be configured, protecting the
load against open feedback loop faults.
The supply features undervoltage lockout, primary sensed
output overvoltage latching shutdown protection, high
efficiency (>805), and very low no-load consumption (<ꢀ0 mW
at 26ꢀ VAC). Output regulation is accomplished using a simple
Zener reference and optocoupler feedback.
When an overvoltage condition occurs, such that bias voltage
exceeds the sum of VR2 and the BYPASS/MULTIFUNCTION
(BYPASS/MULTI-FUNCTIONAL) pin voltage, current begins to
flow into the BYPASS/MULTI-FUNCTIONAL pin. When this
current exceeds ISD the internal latching shutdown circuit in
TinySwitch-4 is activated. This condition is reset when the
ENABLE/UNDERVOLTAGE pin current flowing through R12 and
R13 drop below 18.7ꢀ μA each AC line half-cycle. The
configuration of Figure 16 is therefore non-latching for an
overvoltage fault. Latching overvoltage protection can be
achieved by connecting R12 and R13 to the positive terminal of
C2, at the expense of higher standby consumption. In the
example shown, on opening the loop, the OVP trips at an
output of 17 V.
The rectified and filtered input voltage is applied to the primary
winding of T1. The other side of the transformer primary is
driven by the integrated MOSFET in U1. Diode D1, C3, R1, and
VR1 comprise the clamp circuit, limiting the leakage inductance
turn-off voltage spike on the DRAIN pin to a safe value.
The output voltage is regulated by TL431 U2. When the output
voltage ripple exceeds the sum of the U2 (CATHODE D6) and
optocoupler LED forward drop, current will flow in the
optocoupler LED. This will cause the transistor of the
optocoupler to sink current. When this current exceeds the
ENABLE pin threshold current the next switching cycle is
inhibited. When the output voltage falls below the feedback
threshold, a conduction cycle is allowed to occur and, by
adjusting the number of enabled cycles, output regulation is
maintained. As the load reduces, the number of enabled
For lower no-load input power consumption, the bias winding
may also be used to supply the TinySwitch-4 device. Resistor
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TNY284-290
R4 feeds current into the BYPASS/MULTI-FUNCTIONAL pin,
inhibiting the internal high-voltage current source that normally
maintains the BYPASS/MULTI-FUNCTIONAL pin capacitor
voltage (C7) during the internal MOSFET off-time. This reduces
the no-load consumption of this design from 140 mW to 40 mW
at 26ꢀ VAC.
Function
TinySwitch-III
TinySwitch-4
BVDSS
700 V
N/A
72ꢀ V
Yes
Line Compensated OCP
Typical OCP Change from
8ꢀ VAC to 26ꢀ VAC
>405
<1ꢀ5
UV Threshold
2ꢀ μA ±105
2ꢀ μA ±ꢀ5
Undervoltage lockout is configured by Rꢀ connected between
the DC bus and ENABLE/UNDERVOLTAGE pin of U1. When
present, switching is inhibited until the current in the ENABLE/
UNDERVOLTAGE pin exceeds 2ꢀ μA. This allows the start-up
voltage to be programmed within the normal operating input
voltage range, preventing glitching of the output under abnormal
low voltage conditions and also on removal of the AC input.
VBP Reset Voltage
2.6 V Typical
3.0 V Typical
DIP-8C (P),
eSOP-12B (K),
SO-8C (D)
DIP-8C (P),
SMD-8C (G)
Packages
Table 2.
Comparisons Between TinySwitch-III and TinySwitch-4.
In addition to the simple input pi filter (C1, L1, C2) for differential
mode EMI, this design makes use of E-Shield™ shielding
techniques in the transformer to reduce common mode EMI
displacement currents, and R2 and C4 as a damping network
to reduce high frequency transformer ringing. These techniques,
combined with the frequency jitter of TNY288, give excellent
conducted and radiated EMI performance with this design
achieving >12 dBμV of margin to ENꢀꢀ022 Class B conducted
EMI limits.
TinySwitch-4 Design Considerations
Output Power Table
The data sheet output power table (Table 1) represents the
minimum practical continuous output power level that can be
obtained under the following assumed conditions:
1. The minimum DC input voltage is 100 V or higher for 8ꢀ VAC
input, or 220 V or higher for 230 VAC input or 11ꢀ VAC with
a voltage doubler. The value of the input capacitance should
be sized to meet these criteria for AC input designs.
2. Efficiency of 7ꢀ5.
For design flexibility the value of C7 can be selected to pick one
of the 3 current limits options in U1. This allows the designer to
select the current limit appropriate for the application.
3. Minimum data sheet value of I2f.
4. Transformer primary inductance tolerance of 105.
ꢀ. Reflected output voltage (VOR) of 13ꢀ V.
•ꢀ Standard current limit (ILIMIT) is selected with a 0.1 μF BYPASS/
MULTI-FUNCTIONAL pin capacitor and is the normal choice
for typical enclosed adapter applications.
•ꢀ When a 1 μF BYPASS/MULTI-FUNCTIONAL pin capacitor is
used, the current limit is reduced (ILIMITred or ILIMIT-1) offering
reduced RMS device currents and therefore improved
efficiency, but at the expense of maximum power capability.
This is ideal for thermally challenging designs where dissipa-
tion must be minimized.
•ꢀ When a 10 μF BYPASS/MULTI-FUNCTIONAL pin capacitor is
used, the current limit is increased (ILIMITinc or ILIMIT+1), extending
the power capability for applications requiring higher peak
power or continuous power where the thermal conditions allow.
6. Voltage only output of 12 V with a fast PN rectifier diode.
7. Continuous conduction mode operation with transient KP*
value of 0.2ꢀ.
8. Increased current limit is selected for peak and open frame
power columns and standard current limit for adapter columns.
9. The part is board mounted with SOURCE pins soldered to a
sufficient area of copper and/or a heat sink is used to keep
the SOURCE pin temperature at or below 110 °C.
10. Ambient temperature of ꢀ0 °C for open frame designs and
40 °C for sealed adapters.
*Below a value of 1, KP is the ratio of ripple to peak primary
current. To prevent reduced power capability due to premature
termination of switching cycles a transient KP limit of ≥0.2ꢀ is
recommended. This prevents the initial current limit (IINIT) from
being exceeded at MOSFET turn-on.
Further flexibility comes from the current limits between
adjacent TinySwitch-4 family members being compatible. The
reduced current limit of a given device is equal to the standard
current limit of the next smaller device and the increased
current limit is equal to the standard current limit of the next
larger device.
For reference, Table 3 provides the minimum practical power
delivered from each family member at the three selectable
current limit values. This assumes open frame operation (not
thermally limited) and otherwise the same conditions as listed
above. These numbers are useful to identify the correct current
limit to select for a given device and output power requirement.
Key Application Considerations
TinySwitch-4 vs. TinySwitch-III
Table 2 compares the features and performance differences
between TinySwitch-4 and TinySwitch-III. TinySwitch-4 is pin
compatible to TinySwitch-III with improved features. It requires
minimum design effort to adapt into a new design. In addition
to the feature enhancement, TinySwitch-4 offers two new
packages; eSOP-12B (K) and SO-8C (D) to meet various
application requirements.
Overvoltage Protection
The output overvoltage protection provided by TinySwitch-4
uses an internal latch that is triggered by a threshold current of
approximately ꢀ.ꢀ mA into the BYPASS/MULTI-FUNCTIONAL
pin. In addition to an internal filter, the BYPASS/MULTI-
FUNCTIONAL pin capacitor forms an external filter providing
noise immunity from inadvertent triggering. For the bypass
9
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capacitor to be effective as a high frequency filter, the capacitor
should be located as close as possible to the SOURCE and
BYPASS/MULTI-FUNCTIONAL pins of the device.
practically eliminates audible noise. Vacuum impregnation of
the transformer should not be used due to the high primary
capacitance and increased losses that result. Higher flux
densities are possible, however careful evaluation of the audible
noise performance should be made using production
transformer samples before approving the design.
Peak Output Power Table
230 VAC 1ꢀ5
8ꢀ-26ꢀ VAC
ILIMIT ILIMIT+1
Product
Ceramic capacitors that use dielectrics such as ZꢀU, when
used in clamp circuits, may also generate audio noise. If this is
the case, try replacing them with a capacitor having a different
dielectric or construction, for example a film type.
ILIMIT-1 ILIMIT ILIMIT+1 ILIMIT-1
TNY284P
9.1 W 10.9 W 9.1 W 7.1 W 8.ꢀ W 7.1 W
10.8 W 12 W 1ꢀ.1 W 8.4 W 9.3 W 11.8 W
11.8 W 1ꢀ.3 W 19.4 W 9.2 W 11.9 W 1ꢀ.1 W
1ꢀ.1 W 19.6 W 23.7 W 11.8 W 1ꢀ.3 W 18.ꢀ W
TNY285P
TNY286P
TNY287P
TNY288P
TNY289P
TNY290P
TinySwitch-4 Layout Considerations
Layout
19.4 W 24 W
28 W 1ꢀ.1 W 18.6 W 21.8 W
See Figure 17 for a recommended circuit board layout for
TinySwitch-4.
23.7 W 28.4 W 32.2 W 18.ꢀ W 22 W 2ꢀ.2 W
28 W 32.7 W 36.6 W 21.8 W 2ꢀ.4 W 28.ꢀ W
Single Point Grounding
Use a single point ground connection from the input filter
capacitor to the area of copper connected to the SOURCE pins.
Table 3.
Minimum Practical Power at Three Selectable Current Limit Levels.
For best performance of the OVP function, it is recommended
that a relatively high bias winding voltage is used, in the range of
1ꢀ V - 30 V. This minimizes the error voltage on the bias
winding due to leakage inductance and also ensures adequate
voltage during no-load operation from which to supply the
BYPASS/MULTI-FUNCTIONAL pin for reduced no-load
consumption.
Bypass Capacitor (CBP)
The BYPASS/MULTI-FUNCTIONAL pin capacitor must be
located directly adjacent to the BYPASS/MULTI-FUNCTIONAL
and SOURCE pins.
If a 0.1 μF bypass capacitor has been selected it should be a
high frequency ceramic type (e.g. with X7R dielectric). It must
be placed directly between the ENABLE and SOURCE pins to
filter external noise entering the BYPASS pin. If a 1 μF or 10 μF
bypass capacitor was selected then an additional 0.1 μF
capacitor should be added across BYPASS and SOURCE pins
to provide noise filtering (see Figure 17).
Selecting the Zener diode voltage to be approximately 6 V
above the bias winding voltage (28 V for 22 V bias winding)
gives good OVP performance for most designs, but can be
adjusted to compensate for variations in leakage inductance.
Adding additional filtering can be achieved by inserting a low
value (10 W to 47 W) resistor in series with the bias winding
diode and/or the OVP Zener as shown by R7 and R3 in Figure 16.
The resistor in series with the OVP Zener also limits the
maximum current into the BYPASS/MULTI-FUNCTIONAL pin.
ENABLE/UNDERVOLTAGE Pin
Keep traces connected to the ENABLE/UNDERVOLTAGE pin
short and, as far as is practical, away from all other traces and
nodes above source potential including, but not limited to, the
bypass, drain and bias supply diode anode nodes.
Reducing No-load Consumption
As TinySwitch-4 is self-powered from the BYPASS/MULTI-
FUNCTIONAL pin capacitor, there is no need for an auxiliary or
bias winding to be provided on the transformer for this purpose.
Typical no-load consumption when self-powered is <1ꢀ0 mW at
26ꢀ VAC input. The addition of a bias winding can reduce this
down to <ꢀ0 mW by supplying the TinySwitch-4 from the lower
bias voltage and inhibiting the internal high-voltage current
source. To achieve this, select the value of the resistor (R8 in
Figure 16) to provide the data sheet DRAIN supply current. In
practice, due to the reduction of the bias voltage at low load,
start with a value equal to 405 greater than the data sheet
maximum current, and then increase the value of the resistor to
give the lowest no-load consumption.
Primary Loop Area
The area of the primary loop that connects the input filter
capacitor, transformer primary and TinySwitch-4 should be kept
as small as possible.
Primary Clamp Circuit
A clamp is used to limit peak voltage on the DRAIN pin at
turn-off. This can be achieved by using an RCD clamp or a
Zener (~200 V) and diode clamp across the primary winding.
To reduce EMI, minimize the loop from the clamp components
to the transformer and TinySwitch-4.
Thermal Considerations
The SOURCE pins are internally connected to the IC lead frame
and provide the main path to remove heat from the device.
Therefore all the SOURCE pins should be connected to a
copper area underneath the TinySwitch-4 to act not only as a
single point ground, but also as a heat sink. As this area is
connected to the quiet source node, this area should be
maximized for good heat sinking. Similarly for axial output
diodes, maximize the PCB area connected to the cathode.
Audible Noise
The cycle skipping mode of operation used in TinySwitch-4 can
generate audio frequency components in the transformer. To
limit this audible noise generation the transformer should be
designed such that the peak core flux density is below
3000 Gauss (300 mT). Following this guideline and using the
standard transformer production technique of dip varnishing
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TNY284-290
Maximize hatched copper
Safety Spacing
areas (
) for optimum
heat sinking
Y1-
Capacitor
Output
Rectiꢀer
+
Output Filter
Capacitor
High-Voltage
-
Input Filter Capacitor
PRI
T
r
a
n
s
f
o
r
m
e
r
SEC
BIAS
PRI
D
S
S
S
S
BP/M
BIAS
TOP VIEW
EN/
UV
CBP
*CHF/CBP
Opto-
coupler
DC
-
+
OUT
*CHF is a 0.1 µF high frequency noise bypass capacitor (the high frequency 0.1 µF capacitor eliminates need for CBP if ILIMIT selection requires 0.1 µF).
PI-6651-060612
Figure 17. Recommended Circuit Board Layout for TinySwitch-4 with Undervoltage Lock Out Resistor.
Y Capacitor
Parasitic leakage currents into the ENABLE/UNDERVOLTAGE
pin are normally well below this 1 μA threshold when PC board
assembly is in a well controlled production facility. However, high
humidity conditions together with board and/or package
contamination, either from no-clean flux or other contaminants,
can reduce the surface resistivity enough to allow parasitic
currents >1 μA to flow into the ENABLE/UNDERVOLTAGE pin.
These currents can flow from higher voltage exposed solder
pads close to the ENABLE/UNDERVOLTAGE pin such as the
BYPASS/MULTI-FUNCTIONAL pin solder pad preventing the
design from starting up. Designs that make use of the
undervoltage lockout feature by connecting a resistor from the
high-voltage rail to the ENABLE/UNDERVOLTAGE pin are not
affected.
The placement of the Y capacitor should be directly from the
primary input filter capacitor positive terminal to the common/
return terminal of the transformer secondary. Such a placement
will route high magnitude common mode surge currents away
from the TinySwitch-4 device. Note – if an input π (C, L, C) EMI
filter is used then the inductor in the filter should be placed
between the negative terminals of the input filter capacitors.
Optocoupler
Place the optocoupler physically close to the TinySwitch-4 to
minimizing the primary-side trace lengths. Keep the high
current, high-voltage drain and clamp traces away from the
optocoupler to prevent noise pick up.
Output Diode
For best performance, the area of the loop connecting the
secondary winding, the output diode and the output filter
capacitor, should be minimized. In addition, sufficient copper
area should be provided at the anode and cathode terminals of
the diode for heat sinking. A larger area is preferred at the quiet
cathode terminal. A large anode area can increase high
frequency radiated EMI.
If the contamination levels in the PC board assembly facility are
unknown, the application is open frame or operates in a high
pollution degree environment and the design does not make
use of the undervoltage lockout feature, then an optional
390 kW resistor should be added from ENABLE/UNDERVOLTAGE
pin to SOURCE pin to ensure that the parasitic leakage current
into the ENABLE/UNDERVOLTAGE pin is well below 1 μA.
PC Board Leakage Currents
Note that typical values for surface insulation resistance (SIR)
where no-clean flux has been applied according to the
suppliers’ guidelines are >>10 MW and do not cause this issue.
TinySwitch-4 is designed to optimize energy efficiency across
the power range and particularly in standby/no-load conditions.
Current consumption has therefore been minimized to achieve
this performance. The ENABLE/UNDERVOLTAGE pin under-
voltage feature for example has a low threshold (~1 μA) to
detect whether an undervoltage resistor is present.
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Quick Design Checklist
As with any power supply design, all TinySwitch-4 designs
should be verified on the bench to make sure that component
specifications are not exceeded under worst case conditions.
The following minimum set of tests is strongly recommended:
1. Maximum drain voltage – Verify that VDS does not exceed
67ꢀ V at highest input voltage and peak (overload) output
power. The ꢀ0 V margin to the 72ꢀ V BVDSS specification
gives margin for design variation.
2. Maximum drain current – At maximum ambient temperature,
maximum input voltage and peak output (overload) power,
verify drain current waveforms for any signs of transformer
saturation and excessive leading edge current spikes at
start-up. Repeat under steady-state conditions and verify
that the leading edge current spike event is below ILIMIT(MIN) at
the end of the tLEB(MIN). Under all conditions, the maximum
drain current should be below the specified absolute
maximum ratings.
3. Thermal Check – At specified maximum output power,
minimum input voltage and maximum ambient temperature,
verify that the temperature specifications are not exceeded
for TinySwitch-4, transformer, output diode, and output
capacitors. Enough thermal margin should be allowed for
part-to-part variation of the RDS(ON) of TinySwitch-4 as
specified in the data sheet. Under low-line, maximum
power, a maximum TinySwitch-4 SOURCE pin temperature
of 110 °C is recommended to allow for these variations.
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TNY284-290
Absolute Maximum Ratings(1,4)
DRAIN Voltage ...................................................-0.3 V to 72ꢀ V Notes:
DRAIN Peak Current: TNY284......................... 400 (7ꢀ0) mA(2) 1. All voltages referenced to SOURCE, TA = 2ꢀ °C.
TNY28ꢀ....................... ꢀ60 (10ꢀ0) mA(2) 2. The higher peak DRAIN current is allowed while the DRAIN
TNY286....................... 720 (13ꢀ0) mA(2)
voltage is simultaneously less than 400 V.
TNY287....................... 880 (16ꢀ0) mA(2) 3. Normally limited by internal circuitry.
TNY288..................... 1040 (19ꢀ0) mA(2) 4. 1/16 in. from case for ꢀ seconds.
TNY289..................... 1200 (22ꢀ0) mA(2) ꢀ. Maximum ratings specified may be applied one at a time,
TNY290..................... 1360 (2ꢀꢀ0) mA(2)
EN/UV Voltage ...................................................... -0.3 V to 9 V
EN/UV Current .............................................................. 100 mA
BP/M Voltage .................................................. ......-0.3 V to 9 V
Storage Temperature ...................................... -6ꢀ °C to 1ꢀ0 °C
Maximum Junction Temperature(3)................... -40 °C to 1ꢀ0 °C
Lead Temperature(4) .........................................................260 °C
without causing permanent damage to the product. Exposure
to Absolute Rating conditions for extended periods of time
may affect product reliability.
Thermal Resistance
Thermal Impedance: P Package:
Notes:
(qJA) ................................70 °C/W(2); 60 °C/W(3) 1. Measured on the SOURCE pin close to the plastic interface.
(qJC)(1) ..................................................11 °C/W 2. Soldered to 0.36 sq. in. (232 mm2), 2 oz. (610 g/m2) copper clad.
D Package:
3. Soldered to 1 sq. in. (64ꢀ mm2), 2 oz. (610 g/m2) copper clad.
(qJA) ..............................100 °C/W(2); 80 °C/W(3) 4. The case temperature is measured at the bottom-side
(qJC)(1) ..................................................30 °C/W
K Package:
exposed pad.
(qJA) ................................4ꢀ °C/W(2); 38 °C/W(3)
(qJC)(4) ....................................................2 °C/W
Conditions
SOURCE = 0 V; TJ = -40 to 12ꢀ °C
See Figure 18
Parameter
Symbol
Min
Typ
Max
Units
(Unless Otherwise Specified)
Control Functions
Average
124
132
8
140
Output Frequency
in Standard Mode
TJ = 2ꢀ °C
See Figure ꢀ
fOSC
kHz
5
Peak-to-peak Jitter
Maximum Duty Cycle
DCMAX
S1 Open
62
67
EN/UV Pin Upper
Turnoff Threshold
Current
IDIS
-1ꢀ0
-122
-90
μA
IEN/UV = 2ꢀ μA
IEN/UV = -2ꢀ μA
1.8
0.8
2.2
1.2
2.6
1.6
EN/UV Pin
Voltage
VEN
V
EN/UV Current > IDIS
(MOSFET Not Switching) See Note A
IS1
330
μA
TNY284
TNY28ꢀ
360
410
430
ꢀ10
61ꢀ
71ꢀ
87ꢀ
400
440
470
ꢀꢀ0
6ꢀ0
800
930
EN/UV Open
TNY286
DRAIN Supply Current
(MOSFET
Switching at fOSC
IS2
TNY287
μA
)
TNY288
TNY289
TNY290
See Note B
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Conditions
SOURCE = 0 V; TJ = -40 to 12ꢀ °C
Parameter
Symbol
Min
Typ
Max
Units
See Figure 18
(Unless Otherwise Specified)
Control Functions (cont.)
VBP/M = 0 V, TJ = 2ꢀ °C
See Note C, D
ICH1
-6.ꢀ
-4.ꢀ
-2.ꢀ
BP/M Pin
Charge Current
mA
VBP/M = 4 V, TJ = 2ꢀ °C
See Note C, D
ICH2
-4.7
ꢀ.6
-2.8
ꢀ.8ꢀ
0.9ꢀ
-1.4
6.3
BP/M Pin Voltage
VBP/M
VBP/MH
VSHUNT
ILUV
See Note C
V
V
BP/M Pin
Voltage Hysteresis
0.80
1.20
BP/M Pin
Shunt Voltage
IBP = 2 mA
TJ = 2ꢀ °C
6.0
6.4
2ꢀ
6.8ꢀ
V
EN/UV Pin Line Under-
voltage Threshold
23.7ꢀ
26.2ꢀ
μA
EN/UV Pin – Reset
Hysteresis (Following
Latch Off with BP/M
Pin Current >ISD)
TJ = 2ꢀ °C
See Note G
3
ꢀ
8
μA
Circuit Protection
di/dt = ꢀ0 mA/μs
TJ = 2ꢀ °C
See Note E
TNY284P/D/K
TNY28ꢀP/D/K
TNY286P/D/K
TNY287P/D/K
TNY288P/K
233
2ꢀ6
326
419
ꢀ12
60ꢀ
698
2ꢀ0
27ꢀ
3ꢀ0
4ꢀ0
ꢀꢀ0
6ꢀ0
7ꢀ0
267
294
374
481
ꢀ88
69ꢀ
802
di/dt = ꢀꢀ mA/μs
TJ = 2ꢀ °C
See Note E
di/dt = 70 mA/μs
TJ = 2ꢀ °C
See Note E
Standard Current Limit
(BP/M Capacitor =
0.1 μF) See Note D
di/dt = 90 mA/μs
TJ = 2ꢀ °C
ILIMIT
mA
See Note E
di/dt = 110 mA/μs
TJ = 2ꢀ °C
See Note E
di/dt = 130 mA/μs
TJ = 2ꢀ °C
TNY289P/K
See Note E
di/dt = 1ꢀ0 mA/μs
TJ = 2ꢀ °C
TNY290P/K
See Note E
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Conditions
SOURCE = 0 V; TJ = -40 to 12ꢀ °C
Parameter
Symbol
Min
Typ
Max
Units
See Figure 18
(Unless Otherwise Specified)
Circuit Protection (cont.)
di/dt = 42 mA/μs
TJ = 2ꢀ °C
See Note E
TNY284P/D/K
TNY28ꢀP/D/K
TNY286P/D/K
TNY287P/D/K
TNY288P/K
196
233
2ꢀ6
326
419
ꢀ12
60ꢀ
196
326
419
ꢀ12
60ꢀ
698
791
210
2ꢀ0
27ꢀ
3ꢀ0
4ꢀ0
ꢀꢀ0
6ꢀ0
210
3ꢀ0
4ꢀ0
ꢀꢀ0
6ꢀ0
7ꢀ0
8ꢀ0
233
277
30ꢀ
388
499
610
721
233
388
499
610
721
833
943
di/dt = ꢀ0 mA/μs
TJ = 2ꢀ °C
See Note E
di/dt = ꢀꢀ mA/μs
TJ = 2ꢀ °C
See Notes E
Reduced Current Limit
(BP/M Capacitor =
1 μF) See Note D
di/dt = 70 mA/μs
TJ = 2ꢀ °C
See Notes E
ILIMITred
mA
di/dt = 90 mA/μs
TJ = 2ꢀ °C
See Notes E
di/dt = 110 mA/μs
TJ = 2ꢀ °C
TNY289P/K
See Notes E
di/dt = 130 mA/μs
TJ = 2ꢀ °C
TNY290P/K
See Notes E
di/dt = 42 mA/μs
TJ = 2ꢀ °C
See Notes E, F
TNY284P/D/K
TNY28ꢀP/D/K
TNY286P/D/K
TNY287P/D/K
TNY288P/K
di/dt = 70 mA/μs
TJ = 2ꢀ °C
See Notes E
di/dt = 90 mA/μs
TJ = 2ꢀ °C
See Notes E
Increased Current Limit
(BP/M Capacitor =
10 μF) See Note D
di/dt = 110 mA/μs
TJ = 2ꢀ °C
ILIMITinc
mA
See Notes E
di/dt = 130 mA/μs
TJ = 2ꢀ °C
See Notes E
di/dt = 1ꢀ0 mA/μs
TJ = 2ꢀ °C
TNY289P/K
See Notes E
di/dt = 170 mA/μs
TJ = 2ꢀ °C
TNY290P/K
See Notes E
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Conditions
SOURCE = 0 V; TJ = -40 to 12ꢀ °C
Parameter
Symbol
Min
Typ
Max
Units
See Figure 18
(Unless Otherwise Specified)
Circuit Protection (cont.)
Standard Current
2
Limit, I2f = ILIMIT(TYP)
0.9 ×
I2f
1.12 ×
I2f
TNY284-290
× fOSC(TYP)
I2f
I2f
I2f
TJ = 2ꢀ °C
Reduced Current
Limit, I2f = ILIMITred(TYP)
2
0.9 ×
I2f
1.16 ×
I2f
Power Coefficient
I2f
TNY284-290
× fOSC(TYP)
A2Hz
TJ = 2ꢀ °C
Increased Current
Limit, I2f = ILIMITinc(TYP)
2
0.9 ×
I2f
1.16 ×
I2f
TNY284-290
× fOSC(TYP)
TJ = 2ꢀ °C
See Figure 20
TJ = 2ꢀ °C, See Note G
0.7ꢀ ×
ILIMIT(MIN)
Initial Current Limit
IINIT
tLEB
tILD
mA
ns
Leading Edge
Blanking Time
TJ = 2ꢀ °C
See Note G
170
21ꢀ
1ꢀ0
142
7ꢀ
Current Limit
Delay
TJ = 2ꢀ °C
See Note G, H
ns
Thermal Shutdown
Temperature
TSD
TSDH
ISD
13ꢀ
1ꢀ0
°C
°C
mA
Thermal Shutdown
Hysteresis
BP/M Pin Shutdown
Threshold Current
4
6.ꢀ
9
BP/M Pin Power-Up
Reset Threshold
Voltage
VBP/M(RESET)
1.6
3.0
3.6
V
Output
TJ = 2ꢀ °C
TNY284
28
42
19
29
14
21
32
48
22
33
16
24
ID = 2ꢀ mA
TJ = 100 °C
TJ = 2ꢀ °C
TNY28ꢀ
ON-State
Resistance
RDS(ON)
W
ID = 28 mA
TJ = 100 °C
TJ = 2ꢀ °C
TNY286
ID = 3ꢀ mA
TJ = 100 °C
16
Rev. A 09/12
www.powerint.com
TNY284-290
Conditions
SOURCE = 0 V; TJ = -40 to 12ꢀ °C
Parameter
Symbol
Min
Typ
Max
Units
See Figure 18
(Unless Otherwise Specified)
Output (cont.)
TJ = 2ꢀ °C
TNY287
7.8
11.7
ꢀ.2
7.8
3.9
ꢀ.8
2.6
3.9
9.0
13.ꢀ
6.0
9.0
4.ꢀ
6.7
3.0
4.ꢀ
ID = 4ꢀ mA
TJ = 100 °C
TJ = 2ꢀ °C
TNY288
ID = ꢀꢀ mA
TJ = 100 °C
ON-State
Resistance
RDS(ON)
W
TJ = 2ꢀ °C
TNY289
ID = 6ꢀ mA
TJ = 100 °C
TJ = 2ꢀ °C
TNY290
ID = 7ꢀ mA
TJ = 100 °C
TNY284-286
TNY287-288
TNY289-290
ꢀ0
VBP/M = 6.2 V
VEN/UV = 0 V
VDS = ꢀ60 V
TJ = 12ꢀ °C
See Note I
IDSS1
100
200
μA
OFF-State Drain
Leakage Current
VDS = 37ꢀ V,
TJ = ꢀ0 °C
See Note G, I
VBP/M = 6.2 V
VEN/UV = 0 V
IDSS2
1ꢀ
Breakdown
Voltage
VBP = 6.2 V, VEN/UV = 0 V,
See Note J, TJ = 2ꢀ °C
BVDSS
72ꢀ
ꢀ0
V
V
DRAIN Supply
Voltage
Auto-Restart
ON-Time at fOSC
TJ = 2ꢀ °C
See Note K
tAR
64
3
ms
5
Auto-Restart
Duty Cycle
DCAR
TJ = 2ꢀ °C
17
www.powerint.com
Rev. A 09/12
TNY284-290
NOTES:
A. IS1 is an accurate estimate of device controller current consumption at no-load, since operating frequency is so low under these
conditions. Total device consumption at no-load is the sum of IS1 and IDSS2
.
B. Since the output MOSFET is switching, it is difficult to isolate the switching current from the supply current at the DRAIN. An
alternative is to measure the BYPASS/MULTI-FUNCTIONAL pin current at 6.1 V.
C. BYPASS/MULTI-FUNCTIONAL pin is not intended for sourcing supply current to external circuitry.
D. To ensure correct current limit it is recommended that nominal 0.1 μF / 1 μF / 10 μF capacitors are used. In addition, the BP/M
capacitor value tolerance should be equal or better than indicated below across the ambient temperature range of the target
application. The minimum and maximum capacitor values are guaranteed by characterization.
Tolerance Relative to Nominal
Nominal BP/M
Capacitor Value
Pin Cap Value
Min
Max
+1005
+1005
NA
0.1 μF
1 μF
-605
-ꢀ05
-ꢀ05
10 μF
E. For current limit at other di/dt values, refer to Figure 2ꢀ.
F. TNY284 does not have an increased current limit value, but with a 10 μF BYPASS/MULTI-FUNCTIONAL pin capacitor the current
limit is the same as with a 1 μF BYPASS/MULTI-FUNCTIONAL pin capacitor (reduced current limit value).
G. This parameter is derived from characterization.
H. This parameter is derived from the change in current limit measured at 1X and 4X of the di/dt shown in the ILIMIT specification.
I. IDSS1 is the worst case OFF state leakage specification at 805 of BVDSS and maximum operating junction temperature. IDSS2 is a
typical specification under worst case application conditions (rectified 26ꢀ VAC) for no-load consumption calculations.
J. Breakdown voltage may be checked against minimum BVDSS specification by ramping the DRAIN pin voltage up to but not
exceeding minimum BVDSS
.
K. Auto-restart on time has the same temperature characteristics as the oscillator (inversely proportional to frequency).
18
Rev. A 09/12
www.powerint.com
TNY284-290
470 Ω
5 Ω
S2
470 Ω
S
S
D
S1
2 MΩ
50 V
S
S
BP/M
10 V
EN/UV
150 V
0.1 µF
NOTE: This test circuit is not applicable for current limit or output characteristic measurements.
PI-4079-080905
Figure 18. General Test Circuit.
DC
(internal signal)
MAX
t
P
EN/UV
t
EN/UV
V
DRAIN
1
tP
=
fOSC
PI-2364-012699
Figure 19. Duty Cycle Measurement.
Figure 20. Output Enable Timing.
Typical Performance Characteristics
1.10
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
TJ = 25 °C
TJ = 25 °C
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
Typical
Minimum
Maximum
Typical
Minimum
Maximum
0.60
0.60
0
1
2
3
4
5
6
0
1
2
3
4
5
6
TON (µs)
TON (µs)
Figure 22. Current Limit vs. TON for TNY288~290.
Figure 21. Current Limit vs. TON for TNY284~287.
19
www.powerint.com
Rev. A 09/12
TNY284-290
Typical Performance Characteristics (cont.)
1.1
1.05
1.00
95
90
1.0
0.9
85
80
-50 -25
0
25 50 75 100 125 150
-40 -20
0
20 40 60 80 100 120
Junction Temperature (°C)
Temperature (C)
Figure 23. Breakdown vs. Temperature.
Figure 24. Standard Current Limit vs. Temperature.
300
1.4
1.2
Scaling Factors:
TNY284 1.0
250
TNY285 1.5
TNY286 2.0
TNY287 3.5
TNY288 5.6
TNY289 7.9
TNY290 11.2
1.0
0.8
0.6
0.4
0.2
200
Normalized
di/dt = 1
150
TNY284
TNY285
TNY286
TNY287
50 mA/μs
55 mA/μs
70 mA/μs
90 mA/μs
Note: For the
100
normalized current
limit value, use the
typical current limit
speciꢀed for the
appropriate BP/M
capacitor.
TCASE=25 °C
TCASE=100 °C
TNY288 110 mA/μs
TNY289 130 mA/μs
TNY290 150 mA/μs
50
0
0
0
2
4
6
8
10
1
2
3
4
Normalized di/dt
DRAIN Voltage (V)
Figure 25. Standard Current Limit vs. di/dt.
Figure 26. Output Characteristic.
1000
40
Scaling Factors:
TNY284 1.0
Scaling Factors:
TNY285 1.5
TNY284 1.0
TNY285 1.5
TNY286 2.0
TNY287 3.5
TNY288 5.6
TNY289 7.9
TNY290 11.2
30
TNY286 2.0
TNY287 3.5
TNY288 5.6
TNY289 7.9
100
10
1
20
TNY290 11.2
10
0
0
100 200 300 400 500 600
0
100 200 300 400 500 600
Drain Voltage (V)
Drain Voltage (V)
Figure 27. COSS vs. Drain Voltage.
Figure 28. Drain Capacitance Power.
20
Rev. A 09/12
www.powerint.com
TNY284-290
Typical Performance Characteristics (cont.)
1.2
1.0
0.8
0.6
0.4
0.2
0
-50 -25
0
25 50 75 100 125
Junction Temperature (°C)
Figure 29. Undervoltage Threshold vs. Temperarture.
21
www.powerint.com
Rev. A 09/12
TNY284-290
DIP-8C
⊕D S .004 (.10)
Notes:
-E-
1. Package dimensions conform to JEDEC specification
MS-001-AB (Issue B 7/85) for standard dual-in-line (DIP)
package with .300 inch row spacing.
2. Controlling dimensions are inches. Millimeter sizes are
shown in parentheses.
.240 (6.10)
.260 (6.60)
3. Dimensions shown do not include mold flash or other
protrusions. Mold flash or protrusions shall not exceed
.006 (.15) on any side.
4. Pin locations start with Pin 1, and continue counter-clock-
wise to Pin 8 when viewed from the top. The notch and/or
dimple are aids in locating Pin 1. Pin 3 is omitted.
5. Minimum metal to metal spacing at the package body for
the omitted lead location is .137 inch (3.48 mm).
6. Lead width measured at package body.
Pin 1
-D-
.367 (9.32)
.387 (9.83)
7. Lead spacing measured with the leads constrained to be
perpendicular to plane T.
.057 (1.45)
.068 (1.73)
(NOTE 6)
.125 (3.18)
.145 (3.68)
.015 (.38)
MINIMUM
-T-
SEATING
PLANE
.008 (.20)
.015 (.38)
.120 (3.05)
.140 (3.56)
.300 (7.62) BSC
(NOTE 7)
.100 (2.54) BSC
.048 (1.22)
.053 (1.35)
.137 (3.48)
MINIMUM
P08C
.300 (7.62)
.390 (9.91)
.014 (.36)
.022 (.56)
⊕T E D S .010 (.25) M
PI-3933-100504
22
Rev. A 09/12
www.powerint.com
TNY284-290
SO-8C (D Package)
0.10 (0.004)
A-B
2X
C
2
DETAIL A
B
4
4.90 (0.193) BSC
A
4
D
8
5
GAUGE
PLANE
SEATING
PLANE
3.90 (0.154) BSC
6.00 (0.236) BSC
2
0 - 8o
C
0.25 (0.010)
BSC
1.04 (0.041) REF
0.10 (0.004)
C D
0.40 (0.016)
1.27 (0.050)
2X
1
4
Pin 1 ID
0.20 (0.008) C
2X
7X 0.31 - 0.51 (0.012 - 0.020)
1.27 (0.050) BSC
0.25 (0.010)
M
C A-B D
1.35 (0.053)
1.75 (0.069)
1.25 - 1.65
(0.049 - 0.065)
DETAIL A
H
0.10 (0.004)
0.25 (0.010)
0.10 (0.004)
C
7X
SEATING PLANE
0.17 (0.007)
0.25 (0.010)
C
Reference
Solder Pad
Dimensions
+
Notes:
1. JEDEC reference: MS-012.
2. Package outline exclusive of mold flash and metal burr.
3. Package outline inclusive of plating thickness.
4. Datums A and B to be determined at datum plane H.
2.00 (0.079)
4.90 (0.193)
5. Controlling dimensions are in millimeters. Inch dimensions
+
+
+
are shown in parenthesis. Angles in degrees.
1.27 (0.050)
0.60 (0.024)
D07C
PI-4526-040110
23
www.powerint.com
Rev. A 09/12
TNY284-290
eSOP-12B (K Package)
0.010 [0.25]
Ref.
0.356 [9.04]
Ref.
0.055 [1.40] Ref.
0.010 [0.25]
2
0.004 [0.10] C A 2X
0.400 [10.16]
0.325 [8.26]
H
Pin #1 I.D.
Max.
(Laser Marked)
7
2X
7
12
0.004 [0.10] C B
Gauge Plane
Seating Plane
0.059 [1.50]
Ref, Typ
C
°
°
0 - 8
0.034 [0.85]
0.026 [0.65]
2
0.225 [5.72]
Max.
0.460 [11.68]
0.350 [8.89]
7
0.059 [1.50]
Ref, Typ
DETAIL A (Scale = 9X)
B
0.049 [1.23]
0.046 [1.16]
1
2
3
4
6
6
1
0.008 [0.20] C
2X, 5/6 Lead Tips
0.028 [0.71]
Ref.
3
11×
4
0.120 [3.05] Ref
0.023 [0.58]
0.018 [0.46]
0.070 [1.78]
0.010 (0.25) M C A B
TOP VIEW
BOTTOM VIEW
0.019 [0.48]
Ref.
0.020 [0.51]
Ref.
0.022 [0.56]
Ref.
0.092 [2.34]
0.086 [2.18]
0.098 [2.49]
0.086 [2.18]
0.032 [0.80]
0.029 [0.72]
3
0.016 [0.41]
0.011 [0.28]
11×
Seating
Plane
C
0.306 [7.77]
0.006 [0.15]
0.000 [0.00]
0.004 [0.10] C
Ref.
Detail A
Seating plane to
package bottom
standoff
SIDE VIEW
END VIEW
Land Pattern
Dimensions
0.067 [1.70]
0.217 [5.51]
Notes:
1. Dimensioning and tolerancing per ASME Y14.5M-1994.
1
2
3
4
12
11
10
2. Dimensions noted are determined at the outermost
extremes of the plastic body exclusive of mold flash,
tie bar burrs, gate burrs, and interlead flash, but
including any mismatch between the top and bottom of
the plastic body. Maximum mold protrusion is 0.007
[0.18] per side.
0.028 [0.71]
3. Dimensions noted are inclusive of plating thickness.
4. Does not include interlead flash or protrusions.
5. Controlling dimensions in inches [mm].
0.321 [8.15]
9
8
7
6. Datums A and B to be determined at Datum H.
7. Exposed pad is nominally located at the centerline of
Datums A and B. “Max” dimensions noted include both
size and positional tolerances.
6
0.429 [10.90]
PI-5748a-100311
24
Rev. A 09/12
www.powerint.com
TNY284-290
Part Ordering Information
• TinySwitch Product Family
• Series Number
• Package Identifier
P
D
K
Plastic DIP-8C
SO-8C
eSOP-12B
• Lead Finish
G
RoHS compliant and Halogen Free
• Tape & Reel and Other Options
Blank
TL
Standard Configuration
TNY 288 P G - TL
Tape & Reel, 1000 pcs min./mult.
25
www.powerint.com
Rev. A 09/12
Revision Notes
Date
A
Code A data sheet.
09/12
For the latest updates, visit our website: www.powerint.com
Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability. Power
Integrations does not assume any liability arising from the use of any device or circuit described herein. POWER INTEGRATIONS MAKES
NO WARRANTY HEREIN AND SPECIFICALLY DISCLAIMS ALL WARRANTIES INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS.
Patent Information
The products and applications illustrated herein (including transformer construction and circuits external to the products) may be covered
by one or more U.S. and foreign patents, or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A
complete list of Power Integrations patents may be found at www.powerint.com. Power Integrations grants its customers a license under
certain patent rights as set forth at http://www.powerint.com/ip.htm.
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POWER INTEGRATIONS PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR
SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF POWER INTEGRATIONS. As used herein:
1. A Life support device or system is one which, (i) is intended for surgical implant into the body, or (ii) supports or sustains life, and (iii)
whose failure to perform, when properly used in accordance with instructions for use, can be reasonably expected to result in significant
injury or death to the user.
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause
the failure of the life support device or system, or to affect its safety or effectiveness.
The PI logo, TOPSwitch, TinySwitch, LinkSwitch, LYTSwitch, DPA-Switch, PeakSwitch, CAPZero, SENZero, LinkZero, HiperPFS, HiperTFS,
HiperLCS, Qspeed, EcoSmart, Clampless, E-Shield, Filterfuse, StakFET, PI Expert and PI FACTS are trademarks of Power Integrations, Inc.
Other trademarks are property of their respective companies. ©2012, Power Integrations, Inc.
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