Published:2011/7/10 6:17:00 Author:chopper | Keyword: internal, equivalent, switching power supply, integrated controller | From:SeekIC
HA17385 switching power supply integrated controller uses ⑧-pin DIP package,the figure shows the internal equivalent circuit.From the equivalent circuit,we can learn that HA17385 chip includes all circuits composed of switching power supply like 5V reference voltage regulator, oscillator (triangle wave generator), the error amplifier and power MOSFET drive circuit.The maximum duty ratio of PWM wave is determined by the resistor and capacitor connected to RT/CT end of oscillator.
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