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Inverting output current of PTN78020A

Thiago Finotti
Intellectual 580 points
Other Parts Discussed in Thread: PTN78020A

We are developing a speed controller for fans, from 7V to 12V, 0,3A per fan, up to 4 fans.

Source power is ATX PSU.

There is no power module with positive adjustable output voltage, supplied by 12V and that gives at least 1,5A. However, PTN78020A gives a range of -3 to -15V, 2.1A for Vout=-12V.

Since fans are isolated loads, is PTN78020A able to invert the current circuit, e.g., connecting GND of PTN78020A to V+ of fans and Vout of PTN78020A to GND of fans?

What do you think?

Thanks

  • 0
    TI__Mastermind 38230 points

    PTN78020A will function  as stated However:

    "Since fans are isolated loads, is PTN78020A able to invert the current circuit, e.g., connecting GND of PTN78020A to V+ of fans and Vout of PTN78020A to GND of fans?"

    The only requirement is all of the other output components must be isolated and have the  same ground polarity  capaciitor and external control as does the fan function.