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Original question:

LM5177: LM5177 High Voltage Input Problems

LM5177: Nothing Happening on power up?

Drey Platt
Prodigy 110 points
Part Number: LM5177

I used the ti webdesigner to create the attached schematic. I designed it to allow 12v input with 57v output. When I power the board and apply 12v I see barely 1 volt output. What is wrong on the schematic to prevent start up? Additionally the total power draw is about 10 mA.

  • 0
    TI__Guru 58641 points

    Hi Drey,

    thank you for using the E2E forum.

    As the average current limit is not used please connect IMONOUT to VCC to disable the limiter or just use an Resistor for Current Monitor configuration.

    For further debugging please check following signals:

    - VIN stable

    - SS ramping up

    - SW1 and SW2 - is the controller starting operation with switching this signals

    - COMP pin

    Best regards,

     Stefan