PMP40182测试板BUCK和BOOST模式转换

user4824708

Other Parts Discussed in Thread: TL594, PMP40182

PMP40182在BUCK和BOOST转换时，TL594是如何切换PWM信号的，原理图上未看明白，请指教！

0 Johnsin Tao over 6 years ago

Hi
应该和J2的Vsn/Vsp有关，感觉这一块电路图中不完整。

0 user4824708 over 6 years ago in reply to Johnsin Tao

是的，需要专业人士来解答一下！

0 Yuan Tan63 over 6 years ago

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.

0 Yuan Tan63 over 6 years ago

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.

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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