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UCC12040: Powe supply design

Maor Matityahu
Intellectual 380 points
Part Number: UCC12040
Other Parts Discussed in Thread: UCC14131EVM-070, UCC14130-Q1

Tool/software:

Hello,

I need to develop power supply of the following conditions:

1. Isolated

2. 12V to 12V

3. Max output power 3W

4. At no output load, this power supply needs to consume 5mW max from the input

5. The output voltage can vary from 12V to 15V (load regulation doesnt matter)

What is the best solution suitable for this? Flyback? Forward? Anoter?

What IC do you suggest to use?

Thank you

  • 0
    TI__Mastermind 25895 points

    Maor,

    The no load power consumption of 5mW is difficult. Low, no load power consumption is a feature you see with some off-line flyback controllers used in applications such as AC/DC adaptors. At VIN=12V, features targeting low, no load power consumption are not present. Any general purpose PWM controller such as UCC28C42-Q1, can be used to design a standard flyback converter. Forward converter is way overkill for 3W.

    The closest integrated isolated bias (IIB) DC/DC module with integrated transformer, for 12V-to-12V operation would be UCC14130-Q1 but the max output power is rated 1.5W. Is it possible to partition the 3W output power so that you could use 2x independent UCC14130-Q1 (not recommended to parallel the outputs)? The UCC14131EVM-070 no load power consumption is 250mW at VIN=12V, VOUT=12V.

    You might also consider UCC25800-Q1 which is a transformer driver that can be set up for 12V-to-12V isolated conversion. Transformer drivers operate as open loop converters with integrated MOSFETs but require an external transformer. Since the output is unregulated, the input voltage range must be considered or post regulation added to the secondary side is also often used. There is a UCC25800 EVM available but the no load power consumption is not specified so I'm not sure?

    Regards,

    Steve