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    IR2153 SMPS Low Current

    Hi, I have built my first SMPS. I use IR2153 oscilator 50 kHz and 2x EE4215 ferrite core. Primary turn 40 turn (0.5mm 3 strand) and secondary turn 4 turn (0.5mm 8 strand). My first target is only 15V 20A, but when I attach load (DC Vacum Cleaner 12V 100Watt), output current only 3.5A. What's...
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