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PMP40182: how the TL594 change PWM signals

Part Number: PMP40182

Hi ,

In PMP40182 , when mode changes between Buck and boost, how the TL594 change PWM signals?

thanks!

  • Hi, Yuan,

    Buck Mode:

    Q3 is main FET and Q4 is the freewheel FET. the PWM duty cycle(Q3 turn on time )is increasing as output current increases.

    Boost Mode:

    Q4 is main FET and Q3 is the freewheel FET. the PWM duty cycle(Q4 turn on time )is increasing as output current increases.