LM25184-Q1: the loop stability test

Colt Zhang

Expert 5035 points

Part Number: LM25184-Q1
Other Parts Discussed in Thread: LM25184

my customer has the problem about the loop stability test of LM25184-Q1. They can’t measure valid data.

Equivalent resistance is 5Ω，interference signal is 200mV, the wiring diagram is as follows:

Could you help analyze the problems and provide ways to test loop stability of LM25184-Q1.thanks

over 3 years ago

0 Richard Fu22 over 3 years ago

TI__Mastermind 31315 points

Hi Colt,

Let me check with the team internally, and then I will get back to you on this in the next few days. In the meanwhile, I've recommended this method in this thread. Can you try it?

e2e.ti.com/.../lm25184-q1-loop-stability-test

Regards,

Richard

0 Richard Fu22 over 3 years ago

TI__Mastermind 31315 points

Hi Colt,

I just got feedback from the team, and so loop measurement is not possible with a PSR flyback. A few possibilities to measure is to examine it via simulation, or by doing load-transient tests.

Regards,

Richard

+1 Colt Zhang over 3 years ago in reply to Richard Fu22

TI__Expert 5035 points

Okay, could you tell me how to do loop measurement test of PSR flyback(LM25184) , what the specific solution.

0 Richard Fu22 over 3 years ago in reply to Colt Zhang

TI__Mastermind 31315 points

Hi Colt,

Usually the best way to tell as of now is to try a load transient test per the specifications and see if performance is met. I've attached a document here:

www.ti.com/.../snoa507.pdf

Regards,

Richard

Power management

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LM25184-Q1: the loop stability test