LM51581-Q1: LM51581-Q1 output negative voltage

jeno.zhang

Part Number: LM51581-Q1
Other Parts Discussed in Thread: LM51581, LMR38025

HI,

Can LM51581-Q1 output negative voltage and is there a solution design? The customer's requirement is to have an input of 12V, an output of -36V, and a current of around 150mA. Is there a good solution that can be provided？

Thanks！

10 months ago

0 Niklas Schwarz 10 months ago

TI__Mastermind 23140 points

Hi Jeno,

Thanks for using the e2e forum.
You could use LM51581 in a flyback topology, to generate a negative output voltage, but if no isolation and only one output rail is required, a simpler and cheaper solution might be an inverter or inverting buck-boost topology.
For this, a buck part with high side switch would be suited.
An example for this should ber LMR38025.
https://www.ti.com/product/LMR38025-Q1
As this buck device is part of a different product line, I strongly recommend to set up a new e2e thread with this device number, so you get redirected to the according experts, which might give you even better part recommendations.

Application notes for building this design can be found here:
https://www.ti.com/lit/an/snva856b/snva856b.pdf
https://www.ti.com/lit/an/slyt286/slyt286.pdf

If you have additional questions please let me know.

Best regards,
Niklas

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LM51581-Q1: LM51581-Q1 output negative voltage