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TIDA-01505: How to change output voltage

Til Schoengarth
Prodigy 185 points
Part Number: TIDA-01505
Other Parts Discussed in Thread: TL431-Q1

Hello everyone,

I am currently selecting a flyback converter for a traction inverter emergency supply.

I am happy with the voltage input range of TIDA-01505, but I would like an output of 10V with a current of up to 3.5A.

What do I need to change from the given design for the 15V output to achieve a 10V output? 

Thanks in advance and best regards

Til

  • 0
    TI__Intellectual 1450 points

    Hi Til, the modification is very simple. As long as the transformer is able to support the required input voltage range, you need to just change the feedback divider such the FB_PSR stays 2.5V. Just change R78 or R28. I don't expect much effect to the loop compensation. For the optocoupler-based version, you need to change R73 or R69 around the TL431-Q1.

    This is a standard Flyback converter. You can learn more from the excellent PSDS seminar submission "Under the Hood of Flyback SMPS Designs"

    https://www.ti.com/seclit/ml/slup261/slup261.pdf

    I hope this helps. Best regards, Jiri