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TPS61196: Measuring method phase margin

T Kishi
Genius 4425 points
Part Number: TPS61196

Hi

My customer has question.Please cooperate me.

Customers want to measure the phase margin of TPS61196.
How should I measure to measure with TPS61196?
If I can not measure it, how should I determine the stability?

Regard

T Kishi

  • 0
    TI__Mastermind 22745 points
    Hi TK,
    Yes, it's ok to test the phase margin with TPS61196. But there are some limitions as below:
    1. Since TPS61196 was designed with direct PWM dimming method, you can only test the phase margin at the 100% duty cycle. You can't test the phase margin with differnet PWM duty cycle.
    2. You need to serial connect a 50ohm resistor between the Vout and Fb to inject a AC source.
    Regards
    Sean
  • 0 in reply to Sean Zhou
    TI__Mastermind 22745 points
    HI TK,
    I'm sorry that You need to serial connect a 50ohm resistor between the Vout and OVP to inject a AC source to test the phase margin.
    regards
    Sean