Hi Max, Thanks a lot for sharing the guide. This is a pretty elaborated description about the calibration methodology and the advantages of the newer devices with advanced current sensing technique, which make the calibration easier. I am also impressed to see the option for "no calibration", where the "typical" slope and offset correction factors could be used from the datasheet instead of adding a calibration process during production...this is good for the application where accuracy is not that important. Thanks!
@Aubrey: Re:Do you know if there is a data sheet available? Perhaps it is still preliminary.
Yes, the datasheet is in Max's inbox - I asked him to forward it to you since I didn't have your email address readily available :-)
Correct, the part does not launch in production until Dec13/Jan14, so the datasheet is still a Target datasheet and the Final datasheet has not been released on the website yet. However, samples are available!
Unfortunate that the only units with status indication, the ZXMS6002G and ZXMS6003G have a feeble 500mohm Rds , what kind of automative load only uses 1A? , heck a simple PTC placed in close proximity to the MOSFET tab would provide sufficient protection for a 12v / 1A load.
Have you seen the DRV101 , in a TO220 5pin package , meant for solenoid driver, hits it hard at first then throttles back to PWM, interestingly it has a fault output for both under and overcurrent.
I've also looked at using the UC2845 (usually a current mode flyback PWM driver) driving any old mosfet. If you average the PWM signal (while it's running closed loop) as an analog voltage , you can determine whether it is open or short circuit. But it won't go to 100% duty so only good for bulbs and coils / motors.
Underdriving the gate is a big MOSFET killer , so some kind of de-saturation detector would be helpful.
I've also looked at using the UC2845 (usually a current mode flyback PWM driver) driving any old mosfet. If you average the PWM signal (while it's running closed loop) as an analog voltage , you can determine whether it is open or short circuit.
This is a great idea. You shoul;d submit it to EDN's Design Ideas- make yourself a few bucks.
Have you seen the DRV101
Thnaks for the pointer. I recently saw a TI part, but was only rated to 20V, for automotive applications. This one I can use!