SG5841JDZ-F116 [FAIRCHILD]
Switching Regulator/Controller;
| 型号： | SG5841JDZ-F116 |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Switching Regulator/Controller |
| 文件： | 总14页 (文件大小：495K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Product Specification
Highly Integrated Green-Mode PWM Controller
SG5841/J
FEATURES
DESCRIPTION
Green-Mode PWM Controller
Low Start-Up Current (14µA)
Low Operating Current (4mA)
Programmable PWM Frequency with Hopping
Peak-Current-Mode Control
The highly integrated SG5841/J series of PWM
controllers provides several features to enhance the
performance of flyback converters.
To minimize standby power consumption, a proprietary
green-mode function provides off-time modulation to
continuously decrease the switching frequency at
light-load conditions. This green-mode function enables
the power supply to meet international power
conservation requirements. To further reduce power
consumption, SG5841/J is manufactured using the
BiCMOS process. This allows a low start-up current,
around 14µA, and an operating current of only 4mA. As a
result, a large start-up resistance can be used.
Cycle-by-Cycle Current Limiting
Synchronized Slope Compensation
Leading-Edge Blanking
Constant Output Power Limit
Totem Pole Output with Soft Driving
V
DD Over-Voltage Clamping
Programmable Over-Temperature Protection (OTP)
Internal Open-Loop Protection
V
DD Under-Voltage Lockout (UVLO)
The SG5841/J built-in synchronized slope compensation
achieves stable peak-current-mode control. The
proprietary internal sawtooth power-limiter ensures
constant output power limit over a wide range of AC input
voltages, from 90VAC to 264VAC.
GATE Output Maximum Voltage Clamp (18V)
APPLICATIONS
General-purpose switch-mode power supplies and
flyback power converters, including:
SG5841/J provides many protection functions. In addition
to cycle-by-cycle current limiting, the internal open-loop
protection circuit ensures safety should an open-loop or
output-short-circuit failure occur. PWM output is disabled
until VDD drops below the UVLO lower limit, then the
controller starts again. An external NTC thermistor can be
applied for over-temperature protection.
Power Adapters
Open-Frame SMPS
SG5841/J is available in an 8-pin DIP or SOP package.
TYPICAL APPLICATION
SG5841/J
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 1 -
www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
Product Specification
Highly Integrated Green-Mode PWM Controller
SG5841/J
MARKING DIAGRAMS
PIN CONFIGURATION
H: J = with Frequency Hopping
GND
FB
GATE
VDD
Null = without Frequency
Hopping
T: D = DIP, S = SOP
P: Z = Lead Free
SG5841HTP
XXXXXXXXYWWV
Null=regular package
XXXXXXXX: Wafer Lot
Y: Year; WW: Week
V: Assembly Location
VIN
RI
SENSE
RT
ORDERING INFORMATION
Part Number
Frequency Hopping Pb-Free
Package
SG5841JSZ
Yes
Yes
No
8-Pin SOP
8-Pin DIP
8-Pin SOP
8-Pin DIP
SG5841JDZ
SG5841SZ
SG5841DZ
No
PIN DESCRIPTIONS
Pin No. Symbol Function
Description
1
GND
Ground
Ground.
The signal from the external compensation circuit is fed into this pin. The PWM duty cycle is
determined in response to the signal from this pin and the current-sense signal from Pin 6. If FB
voltage exceeds the threshold, the internal protection circuit disables PWM output after a
predetermined delay time.
2
FB
Feedback
For start-up, this pin is pulled high to the rectified line input via a resistor. Since the start-up
3
4
VIN
RI
Start-Up Input current requirement of the SG5841/J is very small, a large start-up resistance can be used to
minimize power loss.
A resistor connected from the RI pin to GND pin provides the SG5841/J with a constant current
source. This determines the center PWM frequency. Increasing the resistance reduces PWM
frequency. Using a 26KΩ resistor results in a 65KHz center PWM frequency.
Reference
Setting
For over-temperature protection. An external NTC thermistor is connected from this pin to the
GND pin. The impedance of the NTC decreases at high temperatures. Once the voltage of the
RT pin drops below a fixed limit, PWM output is disabled.
Temperature
Detection
5
6
RT
Current sense. The sensed voltage is used for peak-current-mode control and cycle-by-cycle
SENSE
Current Sense
current limiting.
7
8
VDD
Power Supply Power supply. If VDD exceeds a threshold, the internal protection circuit disables PWM output.
GATE
Driver Output
The totem-pole output driver for the power MOSFET, which is internally clamped below 18V.
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 2 -
www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
Product Specification
Highly Integrated Green-Mode PWM Controller
SG5841/J
BLOCK DIAGRAM
5841J only
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 3 -
www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
Product Specification
Highly Integrated Green-Mode PWM Controller
SG5841/J
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter
Value
30
Unit
V
VVDD
VVIN
VFB
Supply Voltage
Input Terminal
30
V
Input Voltage to FB Pin
Input Voltage to SENSE Pin
Input Voltage to RT Pin
Input Voltage to RI Pin
-0.3 to 7.0
-0.3 to 7.0
-0.3 to 7.0
-0.3 to 7.0
DIP
V
VSENSE
VRT
V
V
VRI
V
800.0
400.0
82.5
PD
Power Dissipation (TA < 50°C )
mW
SOP
DIP
R
Thermal Resistance (Junction-to-Air)
Thermal Resistance (Junction-to-Case)
°C/W
°C/W
ΘJA
SOP
141.0
59.7
DIP
ΘJC
R
SOP
80.8
TJ
Operating Junction Temperature
-40 to +125
-55 to +150
260
°C
°C
°C
KV
V
TSTG
TL
Storage Temperature Range
Lead Temperature (Wave Soldering or Infrared, 10 Seconds)
VESD,HBM Electrostatic Discharge Capability, Human Body Model
VESD,MM Electrostatic Discharge Capability, Machine Model
3.0
250
* All voltage values, except differential voltages, are given with respect to GND pin.
* Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Value
Unit
TA
Operating Ambient Temperature
-20 to +85
°C
* For proper operation.
ELECTRICAL CHARACTERISTICS
VDD = 15V, TA = 25°C, unless otherwise noted.
VDD Section
Symbol
VDD-OP
Parameter
Test Condition
Min.
Typ.
Max.
24.7
17
Unit
V
Continuously Operating Voltage
Start Threshold Voltage
Minimum Operating Voltage
Start-up Current
VDD-ON
VDD-OFF
IDD-ST
15
9
16
10
14
V
11
V
VDD=VDD-ON–0.16V
VDD=15V, RI=26KΩ,
GATE=OPEN
30
µA
IDD-OP
Operating Supply Current
4
5
mA
VDD-CLAMP
VDD Over-Voltage-Clamping Level
28
50
29
V
tD-VDDCLAMP
VDD Over-Voltage-Clamping Debounce Time RI=26KΩ
100
200
µs
RI Section
Symbol
RINOR
Parameter
RI Operating Range
Test Condition
Min.
15.5
Typ.
Max.
36.0
Unit
KΩ
RIMAX
Maximum RI Value for Protection
Minimum RI Value for Protection
230
10
KΩ
RIMIN
KΩ
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 4 -
www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
Product Specification
Highly Integrated Green-Mode PWM Controller
SG5841/J
Oscillator Section
Symbol
Parameter
Test Condition
RI=26KΩ
Min.
62
Typ.
65
Max.
68
Unit
Center Frequency
Hopping Range
FOSC
Normal PWM Frequency
KHz
RI=26KΩ (5841J only)
RI=26KΩ (5841J only)
RI=26KΩ
±3.7
3.9
±4.2
4.4
±4.7
4.9
25
tHOP
FOSC-G
FDV
Hopping Period
ms
KHz
%
Green-Mode Frequency
18
22
Frequency Variation vs. VDD Deviation
VDD=11.5V to 24.7V
5
FDT
Frequency Variation vs. Temperature Deviation TA=-20 to +85°C
5
%
Feedback Input Section
Symbol
AV
Parameter
FB Input to Current Comparator Attenuation
Test Condition
Min.
1/3.75
4
Typ.
1/3.20
Max.
1/2.75
7
Unit
V/V
KΩ
V
ZFB
Input Impedance
VFB-OPEN
VFB-OLP
tD-OLP
FB Output High Voltage
FB pin open
5
6
FB Open-Loop Trigger Level
Delay Time of FB pin Open-Loop Protection
Green-Mode Entry FB Voltage
Green-Mode Ending FB Voltage
4.2
26
4.5
4.8
32
V
RI=26KΩ
RI=26KΩ
RI=26KΩ
29
ms
V
VFB-N
1.9
2.1
2.3
VFB-G
VFB-N-0.5
V
Current-Sense Section
Symbol
ZSENSE
Parameter
Input Impedance
Test Condition
Min.
Typ.
12
Max.
Unit
KΩ
V
VSTHFL
Current Limit Flatten Threshold Voltage
Current Limit Valley Threshold Voltage
0.85
0.90
0.22
0.95
VSTHVA
VSTHFL–VSTHVA
V
tPD
Propagation Delay to GATE Output
Leading-Edge Blanking Time
RI=26KΩ
150
270
200
350
ns
ns
tLEB
RI=26KΩ
200
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 5 -
www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
Product Specification
Highly Integrated Green-Mode PWM Controller
SG5841/J
GATE Section
Symbol Parameter
Test Condition
Min.
60
Typ.
65
Max.
70
Unit
%
DCYMAX
Maximum Duty Cycle
Output Voltage Low
Output Voltage High
Rising Time
VGATE-L
VDD=15V, IO=50mA
VDD=12.5V, IO=50mA
VDD=15V, CL=1nF
VDD=15V, CL=1nF
VDD=15V, GATE=6V
VDD=24.7V
1.5
V
VGATE-H
7.5
150
30
V
tr
tf
250
50
350
90
ns
ns
mA
V
Falling Time
IO
Peak Output Current
230
VGATE-CLAMP Gate Output Clamping Voltage
18
19
RT Section
Symbol Parameter
Test Condition
RI=26KΩ
Min.
92
Typ.
100
Max.
108
Unit
µA
V
IRT
Output Current of RT Pin
VRTTH
VRT-RLS
tD-OTP
Trigger Voltage for Over-Temperature Protection
OTP Release Voltage
0.585
0.620
0.655
VRTTH +0.03
100
V
Over-Temperature Debounce
RI=26KΩ
60
140
µs
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 6 -
www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
Product Specification
Highly Integrated Green-Mode PWM Controller
SG5841/J
TYPICAL CHARACTERISTICS
Start-up Current (IDD-S T) vs Temperature
Operating Supply Current (IDD-OP) vs
Temperature
30
5.0
4.5
4.0
3.5
3.0
2.5
26
22
18
14
10
-40
-25
-10
5
20
35
50
65
80
95
110 125
-40
-25
-10
5
20
35
50
65
80
95
95
95
110 125
110 125
110 125
Temperature (℃)
Temperature (℃)
Start Threshold Voltage (VDD-ON) vs
Temperature
Operation Current (IDD-OP) vs VDD Voltage
15
12
9
17.0
16.5
16.0
15.5
15.0
GATE = 1000pF
6
GATE = OPEN
3
0
-40
-25
-10
5
20
35
50
65
80
11
13
15
17
19
21
23
25
27
29
Temperature (℃)
VDD Voltage (V)
PWM Frequency (Fosc) vs Temperature
Min. Operating Voltage (VDD-OFF) vs Temperature
68
67
66
65
64
63
62
11.0
10.5
10.0
9.5
9.0
-40
-25
-10
5
20
35
50
65
80
95
110 125
-40
-25
-10
5
20
35
50
65
80
Temperature (℃)
Temperature (℃)
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 7 -
www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
Product Specification
Highly Integrated Green-Mode PWM Controller
SG5841/J
Trigger Voltage for Over-temperature Protection
(V RTTH) vs Temperature
Max. Duty C ycle (DC YMAX.) vs T emperature
70
0.66
0.65
0.64
0.63
0.62
0.61
0.60
0.59
0.58
68
66
64
62
60
-40
-25
-10
5
20
35
50
65
80
95
110 125
-40
-25
-10
5
20
35
50
65
80
95
110 125
Temperature (℃)
Temperature (℃)
Output C urrent of RT pin (IRT) vs Temperature
108
104
100
96
92
-40
-25
-10
5
20
35
50
65
80
95
110 125
Temperature (℃)
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 8 -
www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
Product Specification
Highly Integrated Green-Mode PWM Controller
SG5841/J
OPERATION DESCRIPTION
Start-up Current
Current Sensing / PWM Current Limiting
Peak-current-mode control is utilized in SG5841/J to
regulate output voltage and provide pulse-by-pulse
current limiting. The switch current is detected by a sense
resistor into the SENSE pin. The PWM duty cycle is
determined by this current sense signal and the feedback
voltage. When the voltage on the SENSE pin reaches
around VCOMP = (VFB–1.0)/3.2, a switch cycle is
terminated immediately. VCOMP is internally clamped to a
variable voltage around 0.85V for output power limit.
Typical start-up current is only 14µA, so that a high
resistance and low-wattage start-up resistor can be used to
minimize power loss. For an AC/DC adapter with
universal input range, a 1.5MΩ, 0.25W start-up resistor
and a 10µF/25V VDD hold-up capacitor are enough for
this application.
Operating Current
Operating current is around 4mA. The low operating
current enables better efficiency and reduces the
requirement of VDD hold-up capacitance.
Leading-Edge Blanking
Each time the power MOSFET is switched on, a turn-on
spike occurs at the sense-resistor. To avoid premature
termination of the switching pulse, a leading-edge
blanking time is built in. During this blanking period, the
current-limit comparator is disabled and cannot switch off
the gate drive.
Green-Mode Operation
The proprietary green-mode function provides off-time
modulation to continuously decrease the PWM frequency
under light-load conditions. To avoid acoustic noise
problems, the minimum PWM frequency is set above
22kHz. This green-mode function dramatically reduces
power consumption under light-load and zero-load
conditions. Power supplies using a SG5841/J controller
can meet even the most restrictive international
regulations regarding standby power consumption.
Under-Voltage Lockout (UVLO)
The turn-on and turn-off thresholds of SG5841/J are fixed
internally at 16V/10V. During start-up, the hold-up
capacitor must be charged to 16V through the start-up
resistor for the IC to be enabled. The hold-up capacitor
continues to supply VDD before the energy can be
delivered from auxiliary winding of the main transformer.
Oscillator Operation
VDD must not drop below 10V during this start-up process.
A resistor connected from the RI pin to the GND pin
generates a constant current source for the SG5841/J
controller. This current is used to determine the center
PWM frequency. Increasing the resistance reduces PWM
frequency. Using a 26KΩ resistor, RI, results in a
corresponding 65KHz PWM frequency. The relationship
between RI and the switching frequency is:
This UVLO hysteresis window ensures that hold-up
capacitor is adequate to supply VDD during start-up.
Gate Output / Soft Driving
The SG5841/J BiCMOS output stage is a fast totem pole
gate driver. Cross conduction has been avoided to
minimize heat dissipation, increase efficiency, and
enhance reliability. The output driver is clamped by an
internal 18V Zener diode to protect power MOSFET
transistors against undesirable gate over-voltage. A soft
driving waveform is implemented to minimize EMI.
1690
----------------------------
(KHz)
(1)
fPWM =
RI (KΩ)
The range of the PWM oscillation frequency is designed
as 47KHz ~ 109KHz.
Built-in Slope Compensation
The sensed voltage across the current-sense resistor is
used for peak-current-mode control and pulse-by-pulse
current limiting. Built-in slope compensation improves
stability or prevents sub-harmonic oscillation. SG5841/J
inserts a synchronized, positive-going ramp at every
switching cycle.
SG5841J also integrates frequency hopping function
internally. The frequency variation ranges from around
62KHz to 68KHz for a center frequency of 65KHz. The
frequency hopping function helps reduce EMI emission of
a power supply with minimum line filters.
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 9 -
www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
Product Specification
Highly Integrated Green-Mode PWM Controller
SG5841/J
When VDD goes below the turn-off threshold (e.g., 10V)
the controller is totally shut down. VDD is charged up to
the turn-on threshold voltage of 16V through the start-up
resistor until PWM output is restarted. This protection
feature remains activated as long as the over-loading
condition persists. This prevents the power supply from
overheating due to over loading conditions.
Constant Output Power Limit
When the SENSE voltage across the sense resistor, RS,
reaches the threshold voltage, around 0.85V, the output
GATE drive is turned off after delay tPD. This delay
introduces additional current, proportional to tPD • VIN / LP.
The delay is nearly constant regardless of the input voltage
VIN. Higher input voltage results in larger additional
current and the output power limit is higher than under low
input line voltage. To compensate this variation for a wide
AC input range, a sawtooth power-limiter (saw limiter) is
designed to solve the unequal power-limit problem. The
Noise Immunity
Noise on the current sense or control signal may cause
significant pulse width jitter, particularly in the
continuous-conduction mode. Slope compensation helps
alleviate this problem. Good placement and layout
practices should be followed. Avoiding long PCB traces
and component leads, locating compensation and filter
components near to the SG5841/J, and increasing the
power MOS gate resistance improves performance.
saw limiter is designed as a positive ramp signal (Vlimit_ramp
)
and fed to the inverting input of the OCP comparator. This
results in a lower current limit at high-line inputs than at
low-line inputs.
VDD Over-Voltage Clamping
VDD over-voltage clamping has been built in to prevent
damage due to abnormal conditions. Once the VDD
voltage is over the VDD over-voltage clamping voltage
(VDD-CLAMP) and lasts for tD-VDDCLAMP, the PWM pulses are
disabled until the VDD voltage drops below the VDD
over-voltage clamping voltage.
Thermal Protection
An NTC thermistor RNTC in series with a resistor RA can
be connected from pin RT to ground. A constant current
IRT is output from pin RT. The voltage on the RT pin can
be expressed as VRT = IRT × (RNTC + RA), in which IRT = 2
x (1.3V / RI). At high ambient temperature, RNTC is
smaller, such that VRT decreases. When VRT is less than
0.62V, the PWM is completely turned off.
Limited Power Control
The FB voltage increases every time the output of the
power supply is shorted or over loaded. If the FB voltage
remains higher than a built-in threshold longer than tD-OLP
,
PWM output is turned off. As PWM output is turned off,
the supply voltage VDD begins decreasing.
----------------- (2)
tD - OLP (ms) = 1.115 ×R (KΩ)
I
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 10 -
www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
Product Specification
Highly Integrated Green-Mode PWM Controller
SG5841/J
REFERENCE CIRCUIT
Q1
F1
BD1
R1
R2
CN1
1
3
1
2
3
L3
L1
L2
2
1
2
C1
C2
T1
4
1
Vo+
D1
VZ1
TR1
R5
R7
R3
C3
C4
D3
+
C7
+
+C8
C6
R4
C5
R6
D2
D4
Q2
U1
GND GATE
1
8
7
6
5
1
R12
2
3
FB
VDD
R16
VIN SENSE
4
RI
RT
R11
R9
R10
SG5841/J
C9
+
C11
R8
THER2
U2
C12
R13
R
C10
R14
U3
VO+
R15
BOM
Reference
BD1
C1
Component
BD 4A/600V
Reference
Q2
Component
MOS 7A/600V
XC 0.68µF/300V
XC 0.1µF/300V
CC 0.01µF/500V
EC 120µ/400V
YC 222p/250V
CC 1000pF/100V
EC 1000µF/25V
EC 470µF/25V
EC 10µF/50V
R1,R2
R3
R 1Mohm 1/4W
R 100Kohm 1/2W
R 47ohm 1/4W
R 750Kohm 1/4W
R 2Kohm 1/8W
R 0.3ohm 2W
C2
C3
R4
C4
R5,R7
R6
C5
C6
R8
C7
R9
R 33Kohm 1/8W
C8
R10
R11
R12
R13
R14
R15
R16
THER2
T1
R 4.7Kohm 1/8W 1%
R 470ohm 1/8W
R 0 ohm 1/8W
C9
C10
C11
C12
D1
CC 222pF/50V
CC 470pF/50V
R 4.7Kohm 1/8W
R 154Kohm 1/8W
R 39Kohm 1/8W
R 100ohm 1/8W
Thermistor TTC104
CC 102pF/50V(Option)
LED
D2
Diode BYV95C
TVS P6KE16A
Diode FR103
D3
D4
Transformer (600µH-PQ2620)
IC SG5841/J
IC PC817
F1
FUSE 4A/250V
Choke (900µH)
Choke (10mH)
Inductor (2µH)
Diode 20A/100V
U1
L1
U2
L2
U3
IC TL431
L3
VZ1
VZ 9G
Q1
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 11 -
www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
Product Specification
Highly Integrated Green-Mode PWM Controller
SG5841/J
PACKAGE INFORMATION
8PINS-DIP (D)
D
Θ
8
1
5
4
e
B
E
L
b1
b
e
Dimensions
Millimeters
Min.
Inches
Symbol
Typ.
Max.
Min.
Typ.
Max.
A
5.334
0.210
A1
A2
b
0.381
3.175
0.015
0.125
3.302
1.524
0.457
9.271
7.620
6.350
2.540
3.302
9.017
7˚
3.429
0.130
0.060
0.018
0.365
0.300
0.250
0.100
0.130
0.355
7˚
0.135
b1
D
9.017
6.223
10.160
6.477
0.355
0.245
0.400
0.255
E
E1
e
L
2.921
8.509
0˚
3.810
9.525
15˚
0.115
0.335
0˚
0.150
0.375
15˚
eB
θ˚
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 12 -
www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
Product Specification
Highly Integrated Green-Mode PWM Controller
SG5841/J
8PINS-SOP(S)
C
8
5
H
E
F
1
4
b
e
D
Θ
L
A
A1
Dimensions
Millimeter
Min.
1.346
Inch
Symbol
Typ.
Max.
1.752
0.254
Min.
0.053
0.004
Typ.
Max.
0.069
A
A1
b
0.101
0.010
0.406
0.203
0.016
0.008
c
D
E
e
4.648
3.810
1.016
4.978
3.987
1.524
0.183
0.150
0.040
0.196
0.157
0.060
1.270
0.050
F
0.381X45°
0.015X45°
H
L
5.791
0.406
0°
6.197
1.270
8°
0.228
0.016
0°
0.244
0.050
8°
θ˚
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 13 -
www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
Product Specification
Highly-Integrated Green-Mode PWM Controller
SG5841/J
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 14 -
www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
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