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Thread: 400w current-mode boost UC3845

  1. #1

    400w current-mode boost UC3845

    i design this circuit and build it.under no load condition input is 15 and output is 36 without problem.but when i connetct a 6 ohm load out put voltage drop to about 14.5v and output current about 2.4amps.
    inductors are self made 31turns/2.5mm gap/er28(pc40 material)55uh
    under no load condition when i connetct input its take about 4-5 seconds to output set 36 volts.
    do you know what is problem?

  2. #2
    .... Silvio's Avatar
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    Apr 2015
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    Have you tried a larger output capacitor? For the output you need to put a light load for the output voltage to settle quicker.

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