AP8269M8R [AITSEMI]
PWM CONTROLLER GREEN MODE;
| 型号： | AP8269M8R |
| 厂家： | 
AiT Semiconductor |
| 描述： | PWM CONTROLLER GREEN MODE |
| 文件： | 总11页 (文件大小：230K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP8269
PWM CONTROLLER
GREEN MODE
AiT Semiconductor Inc.
www.ait-ic.com
DESCRIPTION
FEATURES
The AP8269 is available in SOP8 Packages.
Frequency jitter function to improve EMI
performance of power supply
No-audible-noise green mode Control
External Programmable PWM Switching
Frequency
ORDERING INFORMATION
Internal Slope Compensation
Low VCC Startup Current and Low Operating
Current
Package Type
SOP8
Part Number
AP8269M8R
AP8269M8VR
M8
Leading Edge Blanking
R: Tape & Reel
Note
UVLO
V: Halogen free Package
Gate Max Output Voltage Clamp at 18V
Overload Protection (OLP)
Line Compensation Over Current Protection
(OCP)
AiT provides all RoHS products
Suffix “ V “ means Halogen free Package
With or without VCC OVP
External programmable OTP
Available in SOP8 Packages
TYPICAL APPLICATION
APPLICATION
Offline AC/DC flyback converter for
Battery Charger
Power Adaptor
Set-Top Box Power Supplies
Open-frame SMPS
REV1.1
- JUN 2010 RELEASED, JUL 2012 UPDATED –
- 1 -
AP8269
PWM CONTROLLER
GREEN MODE
AiT Semiconductor Inc.
www.ait-ic.com
PIN DESCRIPTION
Top View
Ground
Pin #
1
Symbol
GND
I/O
P
Function
Feedback input pin. The PWM duty cycle is determined by
voltage level into this pin and the current-sense signal at
Pin sense.
2
CMP
I
3
4
VIN
RT
I
I
Star up supply and line sense Pin
Internal Oscillator frequency setting pin. A resistor
connected between RI and GND sets the PWM frequency.
5
6
TS
CS
I
I
OTP sense pin, connect a NTC resistor to GND.
Current sense input pin. Connected to MOSFET current
sensing resistor node.
7
8
VCC
P
Chip DC power supply pin.
GATE
O
Totem-pole gate drive output for the power MOSFET.
REV1.1
- JUN 2010 RELEASED, JUL 2012 UPDATED –
- 2 -
AP8269
PWM CONTROLLER
GREEN MODE
AiT Semiconductor Inc.
www.ait-ic.com
ABSOLUTE MAXIMUM RATINGS
VCC/VIN, DC Supply
30V
VCC_Clamp+0.1V
10mA
VCC, Zener Clamp Voltage
VCC, Clamp Continuous Current
VCMP, Input Voltage
-0.3 to 7V
VCS, Input Voltage to CS Pin
VTS, Input Voltage to TS Pin
VRT, Input Voltage to RT Pin
TJ, Min/Max Operating Junction Temperature
TSTG, Min/Max Storage Temperature
Lead Temperature (Soldering, 10secs)
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
-20℃ to 150℃
-55℃ to 150℃
260℃
Stresses above may cause permanent damage to the device. These are stress ratings only and functional operation of the device at
these or any other conditions beyond those indicated in the Electrical Characteristics are not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITION
Parameter
VCC Supply Voltage
Symbol
VCC
Min
12
Max
23
Unit
V
RT Resistor Value
RT
24
31
KΩ
℃
Operating Ambient Temperature
TA
-20
85
REV1.1
- JUN 2010 RELEASED, JUL 2012 UPDATED –
- 3 -
AP8269
PWM CONTROLLER
GREEN MODE
AiT Semiconductor Inc.
www.ait-ic.com
ELECTRICAL CHARACTERISTICS
TA = 25℃, VCC=16V, RT=24KΩ, unless otherwise specified
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Supply Voltage (VCC)
VCC Under Voltage Lockout
Enter
VCC Under Voltage Lockout Exit
(Startup)
VCC Over Voltage Protection
Enter
UVLO(Enter)
UVLO(Exit)
OVP(ON)
9.5
10.5
16.5
25
12. 0
17.5
26.5
V
V
V
15.5
23.5
VCC Over Voltage Protection Exit
(Recovery)
OVP(OFF)
OVP_Hys
22.0
-
23.5
1.5
25.0
-
V
V
OVP Hysteresis
OVP(ON)-OVP(OFF)
VCC OVP Debounce time
VCC Zener Clamp Voltage
TD _OVP
-
-
80
-
-
uS
V
VCC_Clamp
I(VCC)=5mA
VCC =15V, Measure
current into VCC
34.5
VCC Start up Current
I_VCC_Startup
-
-
5.5
2.3
20
-
uA
Operation Current
I_VCC_Operation VCMP =3V
mA
Feedback Input Section(CMP Pin)
PWM Input Gain
VCMP Open Voltage
AVCS1
VCMP_Open
ΔVCMP /Δ VCS1
-
-
2.8
6.4
-
-
V/V
V
Short CMP pin to
GND, measure
current
CMP pin short circuit current
ICMP_Short
-
0.64
-
mA
Zero Duty Cycle CMP Threshold
Voltage
Burst Mode CMP Threshold
Voltage
Power Limiting CMP Threshold
Voltage
Power limiting Debounce Time
Input Impedance
VTH _0D
VTH _BM
VTH _PL
-
-
-
-
1. 6
V
V
V
2.2
4.4
-
-
TD_PL
ZCMP_IN
-
-
80
7.2
-
-
mS
KΩ
Current Sense input(CS Pin)
CS Input Leading Edge Blanking
Time
T_blanking
ZCS_IN
-
-
-
250
30
-
-
-
nS
KΩ
nS
Sense Input
Over Current Detection and
Control Delay
TD _OC
120
Current Limiting Threshold at No
Compensation
Current Limiting Threshold at
Compensation
VTH _OC_0
VTH _OC_1
0.85
-
0.93
0.83
0.98
-
V
V
REV1.1
- JUN 2010 RELEASED, JUL 2012 UPDATED –
- 4 -
AP8269
PWM CONTROLLER
GREEN MODE
AiT Semiconductor Inc.
www.ait-ic.com
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Oscillator
Normal Oscillation Frequency
Frequency Temperature Stability
Frequency Voltage Stability
FOSC
60
-
65
2%
2%
70
-
KHz
-
Δf_Temp
Δf_VCC
-20℃ to 100℃
VCC = 12-25V
-
-
Operating RT Range
RT open voltage
RT_range
V_RT_open
F_BM
12
-
24
2
60
-
KΩ
V
Burst Mode Base Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Gate Drive Output
-
22
80
-
-
KHz
%
DC_max
DC_min
75
-
85
0
-
Output Low Level
VOL
VOH
IOUT = -20mA
IOUT= +20mA
VCC=22V
-
11
-
-
-
0.3
V
V
Output High Level
-
-
-
-
Output Clamp Voltage Level
Output Rising Time
VG_Clamp
T_r
20
255
35
V
CL = 1nf
-
nS
nS
Output Falling Time
T_f
CL = 1nf
-
Over Temperature Protection
Output Current of TS pin
OTP Threshold Voltage
I_TS
-
70
-
uA
V
VTH_OTP
1.015 1.065 1.115
OTP Recovery Threshold
Voltage
VTH_OTP_off
-
1.165
-
V
OTP De-bounce Time
TS Pin Open Voltage
Frequency Shuffling
TD_OTP
-
-
100
-
-
uS
V
V_TS_Open
3.75
Frequency Modulation range
Shuffling Frequency
Δf_OSC
-3
-
-
3
-
%
Freq_Shuffling
RT=24KΩ
32
Hz
REV1.1
- JUN 2010 RELEASED, JUL 2012 UPDATED –
- 5 -
AP8269
PWM CONTROLLER
GREEN MODE
AiT Semiconductor Inc.
www.ait-ic.com
BLOCK DIAGRAN
REV1.1
- JUN 2010 RELEASED, JUL 2012 UPDATED –
- 6 -
AP8269
PWM CONTROLLER
GREEN MODE
AiT Semiconductor Inc.
www.ait-ic.com
DETAILED INFORMATION
Over-view description
The AP8269 includes all necessary function to build an easy and cost effective solution for low power supplies
to meet the international power conservation requirements.
Start-up current
Startup current of AP8269 is designed to be very low so that VCC could be charged up above UVLO (exit)
threshold level and device starts up quickly. Also a large value startup resistor can be used to minimize the
power loss.
Green Mode Operation
At light load or no load condition, the switch loss become the major loss of the power supply, to reduce the
power wasted in light and no load condition, based on a special designed voltage controlled oscillator, green
mode operation of the power supply can be achieved by using AP8269. The controller will judge the load
condition base on the voltage of CMP pin. In light load the CMP voltage will decrease, when VCMP is lower
than a set threshold voltage, a CMP depending time (TR2) will be generated by the oscillator and decrease
the operating frequency of the power supply, the minimum frequency is set about 22KHZ. The function block
and the working waveform can be depicted as below:
When VCMP decrease further, the power supply will enter into burst mode operation to decrease the power
consumed at no load condition. Besides there is no audible noise in any load condition.
REV1.1
- JUN 2010 RELEASED, JUL 2012 UPDATED –
- 7 -
AP8269
PWM CONTROLLER
GREEN MODE
AiT Semiconductor Inc.
www.ait-ic.com
Oscillator Operation
A resistor from RT pin to ground will generate a constant current source for AP8269. This current is used to
charge/discharge an internal capacitor and hence the internal clock and switching frequency are determined.
Increase the resistance will decrease the current source and reduce the switching frequency. The relation
between RI and switching frequency is:
Built-in Slope Compensation
The sensed voltage across the sense resistor is used for PWM control, and pulse by pulse current limit,
built-in slope compensation circuit adds a voltage ramp onto the current sense input voltage. This greatly
improves the close loop stability and prevents the sub-harmonic oscillation of peak current mode PWM control
scheme.
Leading Edge Blanking
Each time when the power MOSFET is switched on, a turn-on spike will inevitably occur on the sense-resistor.
To avoid premature termination of the switching pulse, a 250nSec leading-edge blanking time is built in.
Conventional RC filtering can therefore be omitted. During this blanking period, the current-limit comparator is
disabled and it can’t switch off the gate driver.
Gate Driver
The output stage of AP8269 is a fast totem pole gate driver. Cross conduction has been avoided to minimize
heat dissipation, increases efficiency and enhances reliability. The output driver is clamped by an internal 18V
Zener diode in order to protect power MOSFET transistors against undesirable gate over voltage. A soft
driving waveform is implemented to minimize EMI.
Frequency Jitter
The frequency jitter function is integrated in the controller, the jitter is modulated by a periodic signal, the
modulate signal frequency is much smaller than the oscillator frequency, By this way，the EMI noise has a
wider spectrum with lower amplitudes.
REV1.1
- JUN 2010 RELEASED, JUL 2012 UPDATED –
- 8 -
AP8269
PWM CONTROLLER
GREEN MODE
AiT Semiconductor Inc.
www.ait-ic.com
Over Temperature Protection
A NTC resistor in series with a regular resistor should connect between TS and GND for temperature sensing
and protection. NTC resistor value becomes lower when the ambient temperature rises. With the fixed internal
current ITS flowing through the resistors, the voltage at TS pin becomes lower at high temperature. The
internal OTP circuit is triggered and shutdown the MOSFET when the sensed input voltage is lower than
VTH_OTP.
Protect Functions
To increase the reliability of power supply system many protection functions is integrated in this controller,
including Cycle-by-Cycle current limiting (OCP), Over Load Protection (OLP) and over voltage clamp, Under
Voltage Lockout on VCC (UVLO). At overload condition when CMP input voltage exceeds power limit threshold
value for more than TD_PL (power limit debounce time), the controller reacts to shut down the output power
MOSFET. Device restarts when VCC voltage drops below UVLO limit. VCC is supplied by transformer auxiliary
winding output. It is clamped when VCC is higher than threshold value. The power MOSFET is shut down
when VCC drops below UVLO limit and device enters power on start-up sequence thereafter.
REV1.1
- JUN 2010 RELEASED, JUL 2012 UPDATED –
- 9 -
AP8269
PWM CONTROLLER
GREEN MODE
AiT Semiconductor Inc.
www.ait-ic.com
PACKAGE INFORMTION
Dimension in SOP8 Package (Unit: mm)
Symbol
Min
Max
A
A1
A2
b
1.350
0.100
1.250
0.380
1.750
0.250
1.400
0.510
c
0.25(BSC)
D
E
4.800
3.800
5.800
5.000
4.000
6.200
E1
e
1.270(BSC)
L
0.450
0°
0.800
8°
θ
REV1.1
- JUN 2010 RELEASED, JUL 2012 UPDATED –
- 10 -
AP8269
PWM CONTROLLER
GREEN MODE
AiT Semiconductor Inc.
www.ait-ic.com
IMPORTANT NOTICE
AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to
discontinue any integrated circuit product or service without notice, and advises its customers to obtain the
latest version of relevant information to verify, before placing orders, that the information being relied on is
current.
AiT Semiconductor Inc.'s integrated circuit products are not designed, intended, authorized, or warranted to
be suitable for use in life support applications, devices or systems or other critical applications. Use of AiT
products in such applications is understood to be fully at the risk of the customer.
As used herein may
In order to
involve potential risks of death, personal injury, or servere property, or environmental damage.
minimize risks associated with the customer's applications, the customer should provide adequate design and
operating safeguards.
AiT Semiconductor Inc. assumes to no liability to customer product design or application support. AiT
warrants the performance of its products of the specifications applicable at the time of sale.
REV1.1
- JUN 2010 RELEASED, JUL 2012 UPDATED –
- 11 -
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