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Topic: How do you make the current draw from a device gradual instead of instant? (Read 986 times) previous topic - next topic

dhenry

Quote
What simple, cheap device will do that for me up to 12v 3.5amps?


1. serial inductors.
2. thermisters / inrush current limiters.
3. ptc resistors.
4. a mcu.
...

Grumpy_Mike


Quote from: Grumpy_Mike on January 11, 2013, 11:02:35 PM
Look for a feature called "soft start", you fin it on a lot of power regulators and switches.
Quote
I'm trying but can't find anything that fits the bill


A google search for "soft start circuit" comes up with hundreds of designs.
https://www.google.co.uk/search?q=soft+start+circuit&hl=en&client=firefox-a&hs=Ijn&tbo=u&rls=org.mozilla:en-US:official&tbm=isch&source=univ&sa=X&ei=rL3xUJzIEvCU0QWRhIDQBg&ved=0CDAQsAQ&biw=1078&bih=670

For example this one:-
http://www.circuitstoday.com/soft-start-power-supply-circuit
Replace the LM317 with a 3A regulator, or use the output of the LM317 to drive a transistor to boost the output.

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