Author Topic: Push-Pull Output with 500mA@12V  (Read 1208 times)

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Offline DomonokyTopic starter

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Push-Pull Output with 500mA@12V
« on: March 06, 2019, 02:23:12 pm »
Hello,

I have a project where i need an output which can push up to 500mA at 12V and also sink up to 500mA of current. And the circuit for this should use as minimal power as possible while nothing is connected to the output. As this is battery powered and should run as long as possible in standby.
The Output does not need to switch fast. There is now PWM or so planned for this.

The input for this circuit is a 3.3V signal from a flip flop with also has a push-pull output, but only +-20mA @ 3.3V.

Can anybody recommend a circuit/chip for this Levelshifter/Push-pull type thing which uses as little power as possible ?

In a first try is used a MCP1416 MOSFET driver, which works, but uses ~0.5mA when nothing is connected to the output. Also it looks like i have broken one when i pushed to much current into it, even with the PTC fuse in front of the MOSFET driver.

Any help is welcome  :)
« Last Edit: March 06, 2019, 02:28:04 pm by Domonoky »
 

Offline Jeroen3

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Re: Push-Pull Output with 500mA@12V
« Reply #1 on: March 06, 2019, 03:34:23 pm »
Mosfet drivers probably can't do continous 0.5A. See if you can find a half-bridge driver and some small mosfets.
Or an integrated half bridge driver for that matter. (eg: motor driver)
 

Online Zero999

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Re: Push-Pull Output with 500mA@12V
« Reply #2 on: March 06, 2019, 04:47:02 pm »
Yes, it won't be able to drive 500mA continuously.

You could try a higher current MOSFET driver. Both sections of the TC4424 wired in parallel should be able to take 500mA continuously, without any problems, especially the DFN package on a large copper plane.
 

Offline magic

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Re: Push-Pull Output with 500mA@12V
« Reply #3 on: March 06, 2019, 06:43:37 pm »
If you can live with only about 1-11V output swing under load, some low power CMOS opamp or comparator like TLC3702 (20µA supply current) could be used to amplify the waveform and buffered by a bd139/bd140 totem pole to drive the current.
 


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