The 1608b power chip has a total of 8 pins and the maximum operating voltage is 20 volts.
Pin 1: The feedback voltage is used for overvoltage and undervoltage protection
Pin 2: The control pin is the output of the internal error amplifier
Pin 3: Ct pin provides current to charge external timing capacitors
Pin 4: CS pin Limited loop? Pass? Circulate current through the power switch
Pin 5: Sensing the voltage of the auxiliary winding
Pin 6: Grounding
Pin 7: Output drive
Pin 8: Power supply VCC input
Pin 1 is the voltage input and pin 2 is the voltage output. Pin 3 is the voltage input, pin 4 is the voltage output, pin 5 is the power supply, and pin 6 is grounded. The main function of the power chip is to control the voltage stability of the switch.
1 pin zero voltage detection, 2 pin for overcurrent detection, 3 feedback current input, 4 grounding, 5 pin drive signal output, 6 power input overvoltage protection, 7 pin empty pin, 8 start current input end