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DRV8876: DRV8876 - Independent Half-Bridge
Part Number: DRV8876
I'm having a problem with the circuit attached.
The datasheet specifies the current capability as 3.5A of Peak, but when I test my circuit with a valve of 12V/0,5A , the fault pin goes to LOW and the voltage on valve fall to 0.4V.
I'd like to know if there is something wrong with my circuit? Any suggestion to resolve the problem.
We need to go over the Fault table to identify where the fault comes from.
Hector HernandezMotor Applications Team
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In reply to Hector Hernandez Luque:
I'd like to know if there are some recommendations to control a valve in full-bridge (+VBAT=ON, -VBAT=OFF) operating in independent mode.
OUT1 --- ( + VALVE - ) --- OUT2
The following sequence does not work:
(IN1, IN2)= (OUT1, OUT2)
(0V, 0V) = (0.4V, 0.4V) for 0.25s
(3,3v, 0V) = (13.8V, 13.2V) for 3s -> Wrong
(3,3V, 3,3V) = (13.8V, 14V) for 0.25s
(0V, 3,3V) = (0.4V, 14V) for 3s
NFAULT Stay Hiz in all condictions.
If I use the sequence above the LOW SIDE of half bridge STUCK in GND.
(3,3v, 0V) = (13.8V, 0.4V) for 5s
(0V, 3,3V) = (0.00V, 14V) for 5s - Low Side Stuck to GND
(3,3v, 0V) = (13.8V, 0.0V) for 5s - Low Side Stuck to GND
After that both low side was Stucked in GND.
Do you have any recommendation sequence or hardware protection control the valve and avoid damage on H-Bridge?
In reply to LEANDRO SCHMITZ:
I found the problem.
Pin 9 is missing, It must be connected to VSS.
Thank you for help.
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