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LMR33620: Vout = Vin

Torbjörn Pettersson
Prodigy 30 points
Part Number: LMR33620

My LMR33620ARNX is switching at 140kHz with SW high 99.5% of the time. So Vout is close to Vin and FB is kept at 3V (when Vin=15V).

Is the device broken or is there another explanation?

  • 0
    TI__Guru* 78200 points

    Hi Torbjorn,

    Thank you for using our products.  It sounds like the IC is compromised somehow, and the circuit is operating in open loop. I do not see nay obvious problem from the schematic. 

    Could you replace the IC and re-test?  Please make sure the IC is handled carefully without being damaged by ESD and/or overheating during soldering.

    Best Regards,

    Youhao

  • 0 in reply to Youhao Xi
    TI__Guru* 78200 points

    Hi Torbjorn,

    May I assume the issue is resolved and we can close this thread?  You can re-open it by adding a new post.

    Thanks,

    Youhao