PMP40182: how the TL594 change PWM signals

Yuan Tan63

Part Number: PMP40182

Hi ,

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

thanks!

0 David Ji over 5 years ago

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.

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