Part Number:DRV8704
Hi,
I use the DRV8704 H-Bridge Driver and some Mosfets to drive 24V DC Motors.
The IC is configurated to force Slow Decay mode on an overcurrent event.
This worked quiet well to limit the current. No I asked myself how I can detect this overcurrent event.
To detect if the H-Bridge Driver enter Constant Current Mode I came up with this Idea:
Both low side gate driver Pins (A1LS/A2LS) are Connected to an Diode-AND.
The output of the Diode AND is Connected to the uC.
If the DRV enter the CC mode A1LS and A2LS get both high and I can detect the event.
In normal operation A1LS is driven by the PWM and A2LS is Low. In this case the Diode AND theoretically supplies a current to A2LS, this also will happen when the motor is breaking.
Is there an chance does the DRV get damaged by an current to A2LS/A1LS ?
I think A1LS/A2LS are probably push pull outputs and here is no problem, but there is no evidence in the Datasheet for that.
Did you see any problems with this detection circuit or can I design it into my product?