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TIDA-01503: operation problem, analysis

jaeyup jung
Intellectual 570 points
Part Number: TIDA-01503
Other Parts Discussed in Thread: UCC28704

I don't have a normal output

1 waveform - primary side output (15V)

2 waveform - secondary side output (15V)

3 waveform - secondary side output (5V)


1. No load condition

2. Secondary 15V output power load (0.2A)

1 waveform - primary side output (15V)

2 waveform - secondary side output (15V)

3 waveform - secondary side output (5V)


When loading the secondary output power (15 V), the following waveform is output:

Normal output does not come out

The transformer was manufactured by reference.


Why does the output voltage not come out normally?

Help me, Thank you

  • 0
    TI__Intellectual 940 points

    Hi

    based on your waveform, the primary 15V output is not normal. It seems like the auxiliary winding doesn't take over the VDD power supply of the UCC28704. The waveform of primary 15V should be the same as secondary 15V. I think you may need to check your aux winding rectifier circuit and also increase C4 and C13 to see if it's a little helpful.