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Power Tip 22: Avoid These Common Error Amp Pitfalls

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re: Power Tip 22: Avoid These Common Error Amp Pitfalls
brunotje   4/16/2010 3:38:53 PM
Well done Robert.Give us more of that.

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re: Power Tip 22: Avoid These Common Error Amp Pitfalls
Splinter60089   4/15/2010 12:54:22 PM
At last, the problem of the error amplifier driving capability was spoken out. I encountered this issue when using the TL5001 converter IC. The application note recommended the feedback loop components values, which were unacceptable for the design and the impedances were to increase by the factor of 20. If the load capability of an error amplifier is violated a start-up overshoot and undershoot are to be anticipated. This may deteriorate the power supply and its load viability. The TI app engineers I had spoken to agreed on that but the application note for the TL5001 has not been corrected yet. It is very important to obtain the expression for the feedback loop with the assumption of the finite bandwidth of the error amplifier, which would allow for formalizing the design process. Something has been done by the author of these lines but the expression comes out to be very complicated. Those who are interested in may try on their own.

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