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TPS23754EVM-383: I have some questions about tps23754 and would like to consult

Part Number:TPS23754EVM-383Other Parts Discussed in Thread:TPS23731, TPS23751

1.What is the function of inductance L3 and is it necessary?

2.What is the function of CL1?

Johnsin Tao:

Hi

    1,  必须的,正激的电路配置(类似buck电路功能上的电感)。

    2.   CL1用于短路,就是不用到B1100.

,

?? ?:

你好,请教一下,如果我VCC输入使用反激式,这个L3就不需要了吧,同时GATE2也不需要接MOS了吧?有源钳位正向和反激式对效率有多大的影响呢?

另外变压器副边输出是否也是可以使用二极管反激输出?

,

Johnsin Tao:

Hi

    这个设计是有缘钳位,是驱动2个MOS.   如果你只是反激,是不需要L3,  也只是驱动一个MOS.

,

?? ?:

OK,thanks. Can you help me check the schematic design?

vx700ar_230600.pdf

,

Johnsin Tao:

HI

    做成反激吗?  如果是反激,其实可以选择TPS23731之类的芯片。

,

?? ?:

Yes,It's made into a flyback type.Please help confirm if there are any issues with the current design first.

Are there significant differences in efficiency between these two schemes?Because the customer has specified a solution, it is currently uncertain whether to change the solution.

,

?? ?:

Our design requires an output voltage of 12V,The design output of TPS23751 is 5V

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