Hello,
My application drives several valves with a DRV8231A. IN1 and IN2 signals are controlled by a 0V or 3V signal from a microcontroller.
A valve needs 1.2A to open or to close. Power supply is 6V. VREF is set to 2.5V (Itrip=1.4A). The command is applied during about a bit more than 100msec. This is enough to control the valve.
In some cases, I can't explain the behavior of the 2 outputs of the DRV8231A.
The schematic is :
The power supply is activated juste a few msec (12msec) before controlling IN1 or IN2 :
A normal behavior of the outputs OUT1 & OUT2 (named OUTx) is shown in the capture below. According to IN1 or IN2, the voltage across the valve is 6V or -6V :
But sometimes, I observe that OUT1=OUT2 and consequently, there is no voltage across the valve :
Why ?
Can someone help me to understand this ?
Thank you
