I am using a half bridge (BTN8962TA) to provide PWM to a small coil. It works flawless for the most part. I decided to use the BTN8962TA to provide feed back to the microcontroller and I have a H bridge using the same BTN8962TA. The problem is when or if the main ground gets disconnected from my entire controller ground gets provided through the half bridge and the coil. The coil normally pulled low and is always grounded, gets pulled high to energize. I have it wired as shown in attachment other then I'm not using the reverse polarity protection. I am afraid if I ever have a bad ground I may burn up the coil. I know there is a easy solution but I am over looking it, Any help would be great.
I think that it is a perceived problem that doesn't really exist.
Why should the coil "burn up"?
Surely nothing can happen that is any "worse" than setting the duty cycle of the PWM signal to 100%, and you can do that safely - can't you?
If the ground is disconnected how can current flow?
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