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LMR23630: For PFM version, how the dual MOSFET work?

Bella (GZ) Li
Intellectual 1040 points
Part Number: LMR23630

Hi team,

 I learned from the LMR23630 datasheet  how the dual MOSFET work between the PWM and PFM .

I  know when the inductor current drop to  IL_ZC, dual switches will be turned off.

But I didn't find any information about the time between  the dual switches off and HS switch on.

Can you tell me some information about this?

Thank you! Looking forward to your reply.

  • 0
    TI__Mastermind 27256 points

    Hi Bella

    When circuit enters DCM, after iL reaches IL_ZC, LS turns off. As the frequency is fixed, the HS will turn on when next period comes.

    When the load is even lighter, the frequency is decreased, after HS turns off, VFB decrease , and when VFB reaches Vref, HS turns on again.

    Hope that helps.

    Thank you.