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LM5116 as a DC step-down regulator for solar PV application

Other Parts Discussed in Thread: LM5116

I have a solar tracking application requiring 12-24VDC power output direct from a 48V photo-voltaic array for running DC brushed motors (5-10A), 250W max.

The 100V rating of the LM5116 seems fine for up to ~48V solar PV systems, and with the right external MOSFETs it should be able to handle the motor current (if the inductor can keep up).

I was wondering if there were any issues I should be aware of for this application, or if perhaps someone knows how to save me from reinventing a wheel...

Right now I'm leaning towards trying an experimental pcb and see if the LM5116 will work paired with the HC2LP-6R0 inductor suggesting on the eval board BOM. Haven't tried to pick the N-channel MOSFETs. Suggestions appreciated.

Cheers,

Mark

  • Hi
    When you adjust the output voltage, please adjust the low-side feedback resistor. In this way, your compensation loop will not be affected by changing the output voltage.
    About MOSFET selection, please try CSD18531, 32 or 40. 12V margin might not be enough if your board layout is not optimized.
    Regards