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Circuit and chip for low power isolated step down SMPS

Mike Koens
Prodigy 40 points


Hi all, Looking for a suitable controller IC to use, and a circuit, to make a small power supply to power parts of a larger solar power batery charging regulator. The PSU will be powered directly from the solar panel input, 120 - 180 volts DC, and I need two independant and floating outputs, each capable of 12 volts DC at about 0.5 amp. These will supply the MOSFET drivers of the two output stages of the overall circuit. I am happy to wind my own transformer for the output of this small SMPS.

Any help would be appreciated. If you want the block diagram of the overall design, let me know, I'll attach it here.

Cheers, Mike.

  • 0
    Intellectual 410 points

    Hi Mike,

    I have one tested circuit (10W @120-300Vdc)  with 14.7v and 2x12.6V.  If 10W is good for your application I'l give you sch. I am curies to see block diagram of you project.

    Dragan

  • 0 in reply to dragan svalina
    Prodigy 40 points

    Hi Dragan, Thanks, I would appreciate it. I have already ordered a couple of DC-DC converters, nom 48VDC in, 15VDC out, however, they are rated to run up to 80V input, so I am going to put their inputs in series, with a 70V zener across each input, to prevent one or the other from forcing the voltage on the other one higher, and a constant current source supplying them from the 140-180V input. They have good isolation, so each one will power one of the driver stages. However, it was an expensive solution, with each one costing over $25. So I still want to build my own small smps with dual outputs, within the main circuit.

    How can I send you my block diagram, what's your email?

     

    Cheers, Mike.

  • 0 in reply to Mike Koens
    Intellectual 410 points

    Hi Mike,

    I am glad that I can help you in your “solar project”

    Dragan,  dragan@dpipower.com