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参数资料
| 型号： | SG6901ASZ |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 5/19页 |
| 文件大小： | 714K |
| 描述： | IC PFC CTLR AVERAGE CURR 20SOIC |
| 标准包装： | 1 |
| 模式： | 平均电流 |
| 频率 - 开关： | 65kHz |
| 电流 - 启动： | 10µA |
| 电源电压： | 12 V ~ 20 V |
| 工作温度： | -30°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC |
| 包装： | 标准包装 |
| 其它名称： | SG6901ASZDKR |
?2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
SG6901A " Rev. 1.0.2
5
Pin Definitions
Pin # Name Description
1
VRMS
Line voltage detection. The pin is used for PFC multiplier, RANGE control of PFC output
voltage, and brownout protection. For brownout protection, the controller is disabled after a
delay time when the VRMS voltage drops below a threshold.
2
RI
Reference setting. One resistor connected between RI and ground determines the switching
frequency. The switching frequency is equal to [1560 / RI] KHz, where R
I
is in K? For example,
if RI is equal to 24K? the switching frequency is 65KHz.
3
OTP
Over-temperature protection. A constant current is output from this pin. An external NTC
thermistor must be connected from this pin to ground. The impedance of the NTC thermistor
decreases whenever the temperature increases. Once the voltage of the OTP pin drops below
the OTP threshold, the SG6901A is disabled.
4
IEA
PFC current amplifier output. The signal from this pin is compared with an internal sawtooth
to determine the pulse width for PFC gate drive.
5
IPFC
The inverting input of the PFC current amplifier. Proper external compensation circuits result
in excellent input power factor via average-current-mode control.
6
IMP
The non-inverting input of the PFC current amplifier and the output of multiplier. Proper
external compensation circuits results in excellent input power factor via average-current-mode
control.
7
ISENSE Current limit. A resistor from this pin to GND sets the current limit.
8
FBPWM
The control input for voltage-loop feedback of PWM stage. It is internally pulled high
through a 6.5k?resistance. Usually an external opto-coupler from secondary feedback circuit is
connected to this pin.
9
IPWM
The current-sense input for the flyback PWM. Via a current sense resistor, this pin provides
the control input for peak-current-mode control and cycle-by-cycle current limiting.
10
AGND
Signal ground.
11
SS
Soft start. During startup, the SS pin charges an external capacitor with a 50?/SPAN>A (R
I
=24K?
constant current source. The voltage on FBPWM is clamped by SS during startup. In the event
of a protection condition occurring and/or PWM being disabled, the SS pin is quickly
discharged.
12
OPWM
The totem-pole output drive for the flyback PWM MOSFET. This pin is internally clamped under
17V to protect the MOSFET.
13
GND
Power ground.
14
OPFC
The totem-pole output drive for the PFC MOSFET. This pin is internally clamped under 17V
to protect the MOSFET.
15
VDD
The power supply pin.
16
RANGE
The RANGE pin has high impedance whenever the V
RMS
voltage is lower than a threshold.
The PFC output voltage at low line can be reduced to improve efficiency.
17
OVP
The PFC stage over-voltage input. The comparator disables the PFC output driver if the
voltage at this input exceeds a threshold. This pin can be connected to FBPFC or it can be
connected to the PFC boost output through a divider network.
18
FBPFC
The feedback input for PFC voltage loop. The inverting input of PFC error amplifier. This pin
is connected to the PFC output through a divider network.
19
VEA
The error amplifier output for PFC voltage feedback loop. A compensation network (usually
a capacitor) is connected between this pin and ground. A large capacitor value results in a
narrow bandwidth and improves the power factor.
20
IAC
This input is used to provide current reference for the multiplier.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SG6902 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green-Mode PFC / Flyback-PWM Controller |
| SG6902SZ | 功能描述:开关变换器、稳压器与控制器 Grn Mode PFC/Flyback PWM Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SG6903SZ | 功能描述:开关变换器、稳压器与控制器 Highly-Integrated Grn Mode PWM Cntrl RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SG6905 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green mode PFC/Flyback-PWM Controller |
| SG6905SY | 制造商:Rochester Electronics LLC 功能描述: 制造商:Fairchild Semiconductor Corporation 功能描述: |
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