Let's Make Robots!

12V-30V Arduino Power Supply

So one project that I've been working on lately is a 24V Brushed Motor Controller Shield for Arduino. One of the features that the shield must implement is a power supply capable of power the Arduino with more than 15V, activates the Arduino when the input voltage is greater than 12V, and power any necessary gate driver circuitry. I finished Rev 1 of the power supply and plan to add one more revision to the power supply circuit before designing the reminding parts of the shield. 

 

The one revision I plan to make is to clamp the gate voltage at VN10LP so it will not get damaged. I plan to release more schematics I make as the project progresses.

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You should probably keep your image width dimensions under about 500px. You can actually make the image a link to the full size pic once you have added the "thumbnail".

OddBot: The circuit is intended for controlling higher voltage motors (24V motors). For controlling higher voltage motors, you need gate drive circuits which must be switched with at least 12V.  I thought rather than building a 5V circuit for the Arduino and a 12V supply for the arduino, I could use the 12V circuit as a pre-regulator for the Arduino's 5v supply

bdk6: I agree with the MOSFETs. I wanted the use the bss123lt1 mosfet, but it was in a SMD package. As for the oscillations and overvoltage lockout, you provide a good point. I plan to modify the cicuit anyway.

OT: I apologize for the picture and will fix it in the future.

One more note. This is not the full power supply circuit. There's still the matter of adding bulk capacitors to the input power. But I appeciate the suggestions about the on/off voltage shutoff and the overvoltage problem.

One more note. This is not the full power supply circuit. There's still the matter of adding bulk capacitors to the input power. But I appeciate the suggestions about the on/off voltage shutoff and the overvoltage problem.