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FAN4800AS 数据表(PDF) 6 Page - Fairchild Semiconductor |
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FAN4800AS 数据表(HTML) 6 Page - Fairchild Semiconductor |
6 / 19 page © 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN4800AS/CS/01S/02S • Rev. 1.0.1 6 Pin Configuration Figure 7. Pin Configuration (Top View ) Pin Definitions Pin # Name Description 1 IEA Output of PFC Current Amplifier . The signal from this pin is compared with an internal sawtooth to determine the pulse width for PFC gate drive. 2 IAC Input AC Current . For normal operation, this input provides current reference for the multiplier. The suggested maximum IAC is 100µA. 3 ISENSE PFC Current Sense . The non-inverting input of the PFC current amplifier and the output of multiplier and PFC ILIMIT comparator. 4 VRMS Line-Voltage Detection . The pin is used for the PFC multiplier. 5 SS PWM Soft-Start . During startup, the SS pin charges an external capacitor with a 10µA constant current source. The voltage on FBPWM is clamped by SS during startup. If a protection condition occurs and/or PWM is disabled, the SS pin is quickly discharged. 6 FBPWM PWM Feedback Input . The control input for voltage-loop feedback of PWM stage. 7 RT/CT Oscillator RC Timing Connection . Oscillator timing node; timing set by RT and CT. 8 RAMP PWM RAMP Input . In current mode, this pin functions as the current-sense input; when in voltage mode, it is the feedforward sense input from PFC output 380V (feedforward ramp). 9 ILIMIT Peak Current Limit Setting for PWM . The peak current limits setting for PWM. 10 GND Ground . 11 OPWM PWM Gate Drive . The totem-pole output drive for PWM MOSFET. This pin is internally clamped under 19V to protect the MOSFET. 12 OPFC PFC Gate Drive . The totem-pole output drive for PFC MOSFET. This pin is internally clamped under 15V to protect the MOSFET. 13 VDD Supply . The power supply pin. The threshold voltages for startup and turn-off are 11V and 9.3V, respectively. The operating current is lower than 10mA. 14 VREF Reference Voltage . Buffered output for the internal 7.5V reference. 15 FBPFC Voltage Feedback Input for PFC . 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. 16 VEA Output of PFC Voltage Amplifier . The error amplifier output for PFC voltage feedback loop. A compensation network is connected between this pin and ground. |
类似零件编号 - FAN4800AS |
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类似说明 - FAN4800AS |
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