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Requesting for a Switching Regulator

Kiran A
Intellectual 610 points
Other Parts Discussed in Thread: LM25017

Hi,

We are looking for a single IC with multiple outputs with below requirements:

Input : 28V

Output 1: 5 V & 300 mA

Output 2: (-12 V) & 50 mA

  • 0
    Guru 316440 points

    Something like the LT8471?

    It does not appeat that any of TI's single-chip split-rail converters does what you want.

    Why can't you use two ICs?

  • 0
    TI__Mastermind 39980 points
    Hello Kiran,

    You could use a FlyBuck boost converter with 28V in and -12V output on the primary. the switcher is set up as a buck boost inverter with a coupled winding. Use a 1:0.5 turns ratio transformer to yield ~5.5V on the secondary. You can then use an LDO to post regulate to 5V. If you dont want to use an LDO you can use a 1:0.458 turn ratio to supply ~5V on the secondary. Please note that a 5% accuracy on the secondary can only be achieved in the most ideal of circumstances. Consider the LM25017.

    If you need better accuracy will need to post regulate the 5V or use 2 separate converters.

    Hope this helps?