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VOUT modulation through a PWM signal into the FB

Vincenzo Pizzolante
Mastermind 22776 points
Other Parts Discussed in Thread: LM61440, LM76003

hi,

I'm looking for a suitable 36Vin, 12Vout, 3A out buck converter with the ability to change the output while superimposing a DC signal on the FB divider.

the DC signal will be the average (LP) output of a PWM input.

I'm looking at the new LM7600x.

Do you see any drawback in such implementation?

thansk a lot in advance

KR

Vincenzo

  • 0
    TI__Mastermind 49537 points

    Hi Vincenzo,

    Also consider our new LM61440 low EMI converter family. But if you need 60V input, then the LM76003 is the way to go. Adjusting VOUT by injecting a current into FB should be fine -- just verify compensation at the Vout extremes as effective value of ceramic Cout reduces with voltage.

    Regards,

    Tim