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UCC256403: UCC256403 Technical issues

Part Number: UCC256403

Tool/software:

Dear Sir,

We have developed a battery charger using UCC256403 from your reference design all other stages are working according to your specification ,

but with DC to DC convertor (LLC) we are facing the problem and we are not getting the output mosfit  are not switching. We are attaching the circuit & pin voltages. Kindly

revert back how to solve the problem. 

Regards

Empower Technologies

#45,434, 4th cross , S.G.Kaval, Hanumanthanagar

Sunkadakatte ,Bangalore-560 091

U3 Voltage Readings May 30th.pdf

Pin Voltages

  • Hi,

    Can you please provide me waveforms of

    1. Voltage between TP2 Point- HS pin  of IC,

    2. Voltage between TP3 Point-Ground pin of IC,

    3. Gate-source voltages of Q7 and Q8,

    4. Drain-source voltages of Q7 and Q8, 

    5. Voltage across Boot capacitor C34.

    Regards,

    Sougata