power MOSFET on/off switch -- asking for critique


Posted on Feb 4, 2014

A `power button` that is actually two buttons; one on, one off. This needs to switch on the order of 15 V and up to 10 A, for a LiFePO4 battery powered device. I don`t want to use a hardwired switch where this is mechanical, because I later also want soft (MCU-based) control of the same on/off functions. I don`t want to use a relay because60 mA for a typical coil


power MOSFET on/off switch -- asking for critique
Click here to download the full size of the above Circuit.

current is a lot (the typical load is perhaps 500 mA, but peak load on the device is 10 A. ) This is the best I could come up with. De-bouncing the buttons is not needed. When first connected, I think it enters "off" state because the gate is weakly pulled to ground through the load (output) - and even if it isn`t, the main power P-channel FET isn`t going to have any gate charge. If you want to spend a few minutes helping out a poor n00b on circuit design, please critique this design and suggest whatever you think needs improving in this circuit. (Three FETs really ) If you think my diagram is hard to read (I got that last time :-) then please at least critique exactly what you think is poor about the diagram, so that I can better communicate in the future.




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