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.
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?? ?:
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?
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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.
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?? ?:
OK,thanks. Can you help me check the schematic design?
vx700ar_230600.pdf
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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。
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?? ?:
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.
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?? ?:
Our design requires an output voltage of 12V,The design output of TPS23751 is 5V