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LM2678, Increasing current

Andreson Williams
Prodigy 135 points
Other Parts Discussed in Thread: LM2678

Greetings,

I have been successful with LM2678 -ADJ to achieve around 4.8 amps to be used as a battery charging circuit.
I was thinking that can the current rating be increased by using an external switch(transistor or mosfet) on "pin 1-switch output"?
Sufficiently i want to double the current rating to atleast 10 amps.

  • 0
    TI__Genius 16025 points

    Hi Andreson,

    The switch output is not commutable to the gate of an external switch in a regulator or converter, simply because it wasn't designed to do this. The output from the regulator's switch pin are large voltage spikes that can easily reach Vin. Most FET's are not capable of a gate voltage that is that high.

    However, hypothetically if we had a MOSFET that could handle the High SW node voltages, it would be a crude method of increasing output current, because stability of the circuit would work on a case by case basis and there is no guarantee that this will work reliably in all corner cases.

    My suggestion is to use Webench to source a controller for your design or even more simply a power module to meet your needs.

    Thanks,

    Anston