HA17385 switching power supply integrated controller internal equivalent circuit diagram

The HA17385 switching power supply integrated controller adopts an 8-pin DIP package. The picture shows the internal equivalent circuit block diagram. It can be seen from the equivalent circuit block diagram that the HA17385 chip has a 5V reference voltage regulator, oscillator (triangular wave generator), error amplifier and power MOSFET drive circuit, etc. All circuits required to form a switching power supply. The maximum duty cycle of the PWM wave is set by the resistor and capacitor connected to the RT and T terminals of the oscillator.

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