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Freyguy · 09-22-2011, 02:52 PM

twotires,
Glad you figured out to measure DC/DC output side reference power ground. I burned myself on that one when I first bench tested my controller.
The +12V draw of the controller should be in the 110mA range (zero throttle).

I think your U7 might be bad versus U6. Reason I say this is that U7 is an inverting MOSFET driver. If you see 0.7V on U6 pin 6 (and therefore U7 pin 2), the output pins of U7 should be +12V and driving those mosfets on. U7 pin 1 measures +12V, correct? I think U7 pin 2 is internally shorted and may be pulling R16 low. Remove U6 then power up the board. U7 pin 2 should measure +12V. If it’s still at 0.7, then U7 is bad and U6 is probably fine.

09-22-2011, 02:52 PM	#9 (permalink)
Freyguy EV Builder Join Date: Nov 2010 Location: Macungie, PA Posts: 157 Thanks: 15 Thanked 64 Times in 40 Posts	twotires, Glad you figured out to measure DC/DC output side reference power ground. I burned myself on that one when I first bench tested my controller. The +12V draw of the controller should be in the 110mA range (zero throttle). I think your U7 might be bad versus U6. Reason I say this is that U7 is an inverting MOSFET driver. If you see 0.7V on U6 pin 6 (and therefore U7 pin 2), the output pins of U7 should be +12V and driving those mosfets on. U7 pin 1 measures +12V, correct? I think U7 pin 2 is internally shorted and may be pulling R16 low. Remove U6 then power up the board. U7 pin 2 should measure +12V. If it’s still at 0.7, then U7 is bad and U6 is probably fine.