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TPS53219A / Start up issue due to improper ripple injection

Other Parts Discussed in Thread: TPS53219A

Hi Everyone,

Our customer is facing startup issue by using TPS53219A as attached. They found that the behavior is resolved by resoldering resistor and capacitor used at ripple injection circuit. Then please give your comment for following question.

[Situation]

  • The switching is stopped during startup.
  • The switching frequency is approx. 2MHz before stopping switching.
  • This behavior is resolved by resoldering ripple injection component R7 and C1.

[Question]

  • Is this operation expected due to opened or shorted R7 or C1?
  • Can you explain the reason (mechanism) of 2MHz switching before stopping operation?

TPS53219A Start up issue due to improper ripple injection.pdf

Best Regards,

Sonoki / Japan Disty