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Full-bridge motor/coil driver recommendations with external sense resistor
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uer166:
Does anyone have any good single or (ideally) dual full-bridge driver recommendations? Requirements are:
* 200mA drive at 3.3V-9V voltage input range
* Can support external current sense resistor (important)
* Does NOT do any constant-frequency (e.g. TI DRV8833), or constant-off time (e.g. DRV8833C) current regulation from external resistor
* Either does cycle-by-cycle current regulation, basically re-setting output at current limit and re-enabling at new PWM input rising edge, OR:
* Does not do any current regulation, but still supports external current sense resistor
The issues with these requirements that I found:
* Plenty of ICs do current regulation with the external sense resistor which I don't want
* Plenty of ICs don't do any current regulation, but they don't support shunt resistor explicitly. I'd be scared of putting a shunt resistor in GND reference path since that would shift the control voltages into negatives
What I'm trying to do is bipolar excitation of an inductor into saturation at around 5KHz, that external resistor is there to detect the saturation and also as sensor feedback. Are the above requirements mutually exclusive? Sounds like I really want a simple (low) power stage instead of a fully integrated motor driver. Don't want to go discrete either since the current solution is a mess of FETs/BJTs.
langwadt:
the ancient L298? hough the voltages are a bit low
as for putting a shunt resistor in GND reference path, if you keep the sense voltage less than a diode voltage you might stay within spec of most ICs
uer166:
--- Quote from: langwadt on December 31, 2019, 01:44:31 am ---as for putting a shunt resistor in GND reference path, if you keep the sense voltage less than a diode voltage you might stay within spec of most ICs
--- End quote ---
I need something like 0.5V of range, outside of diode voltage. I think it may still work with current limiting resistors in the signal paths but still sketchy.
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