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.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Voltmeter circuit
Single IC chip Motor Driver for robots
Rs232c-led-circuit
Potentiometer-Position V/F Converter
simple common emitter amplifier
Light sensor using Op Amp
Original Macintosh 512K Logic Board Schematic
reference design digitally controlled sine wave generator
Frequency counter Oscillator schematic
TWH9205 by the integrated circuit consisting of a temperature control circuit automatically



Top