Datasheet FL7740 (ON Semiconductor) - 3

FL7740 FUNCTION DESCRIPTION Pin No. Pin Name Function Description
1 VDD IC Supply IC operating current and MOSFET driving current are supplied using this pin. 2 GND Ground Controller ground pin. 3 GATE PWM Driver This pin uses the internal totem−pole output driver to drive the power MOSFET. Output 4 CS Current Sense Connected to a current sense resistor to detect the MOSFET current for pulse− by− pulse current limit. 5 VS Voltage Sense This pin is connected to the auxiliary winding of the transformer via a resistor divider to detect the output voltage. 6 PF Power Factor This pin is connected to a resistor to optimize power factor. 7 BIAS Internal Circuit Bypass pin for the internal supply, which powers all control circuitry on the IC. BIAS 8 COMV Loop This pin is connected to a capacitor between COMV and GND for compensation. Compensation 9 NC No Connection 10 HV High Voltage This pin is connected to the rectified input voltage via a resistor for fast startup.
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