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LM5000: Usable max voltage; also HV eval board?

Ray Zeune
Prodigy 110 points
Part Number: LM5000

I need an unusual boost converter for a proof-of-concept design.

The input will be a 4S LiPo battery pack, 12-17VDC.

The output is dual rail, +/-65V at 200mA.

The LM5000 looks like it will work for the positive side, but the output voltage is pretty close to 75V max. Is this too close to the max to be reliable?

Also, are there any demo boards that could be modified to evaluate this design?

Any ideas for the negative side (-65V)?

  • 0
    TI__Mastermind 46905 points
    the engineer supporting this device will answer your question after back to office
  • 0
    TI__Mastermind 34201 points
    Hi Ray,

    The maximum Voltage on SW pin is 80V. Take care of the layout and add a resistor-capacitor snubber network across the high-side N-channel MOSFET device will reduce the ringing and spikes at the switching node. Then 65V output voltage is fine for LM5000.
    Right now TI only has LM5000 non isolated flyback evm.
    To get the negative side, you can use WEBENCH and input the Vin, Vo and load current. Then you will get a suggestion.

    Regards,
    Zack