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DRV8837: Short-circuit protection

Jason_Wei
Prodigy 40 points
Part Number: DRV8837

Hi,Team

I need some help on the current limit for the DRV8837. Here is the problem description.

My application for DRV8837 is shown as below.R1 is not used. VCC=4V，IN1 and nSLEEP is pull high by VCC, A PWM signal (4V,50%Duty)  is provided to IN2.

 OUT1 is short to OUT2 .The captures are shown as below.

VM=2.5V,PWM 50KHz

VM=2.5V,PWM 10KHz

VM=1.5V,PWM 10KHz

There are my questions:

1. When OUT1 is short to OUT2,is the device protected by OCP?

2. If the OCP is occurred, why is OCP released so fast(PWM50KHz:6.3us; PWM10KHz:9.2us)?

3. Why is the time between pulse to pulse(IOUT) changed following PWM frequency?

Thanks!

Jason wei

  • 0
    TI__Guru** 114905 points
    Hi Jason,

    It appears you may not have enough capacitance to maintain the VM voltage.

    If this is true, you may be experiencing undervoltage events. Please increase the capacitance to avoid undervoltage events.

    Once undervoltage is no longer seen, the OCP event should operate as expected.