DRV8873-Q1: Overcurrent Detection Function about DRV8873-Q1 Evaluation Board

Hi Fukazawa-san,

Can you provide additional information?

1) What was this a DRV8873S-Q1EVM or DRV8873H-Q1EVM?
2) Can you provide a picture of the EVM
3) What were the GUI settings prior to Disable → Enable?
4) What is the VM voltage
5) How did the motor behave wrong?
6) How was motor configured to operate?
a) Was the motor connected across both outputs or one output to either VM or GND?

We had one report of a damaged EVM, but the customer was not able to replicate the scenario.

Hi Rick-san,

I am covering for Fukazawa. He is my colleague.

1) What was this a DRV8873S-Q1EVM or DRV8873H-Q1EVM?
They use the DRV8873H-Q1EVM

2) Can you provide a picture of the EVM
I asked the customer to take a picture of the EVM

3) What were the GUI settings prior to Disable → Enable?
I will explain it as below.

4) What is the VM voltage
24V

5) How did the motor behave wrong?
The motor do not rotate, but slightly vibration.

6) How was motor configured to operate?
One BrushedDC motor is connected between OUT1 and OUT2.
The specification of the motor : R = 1.58ohm , L=3mH

I explain the situation of the customer.
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At first, they configure the DRV8873H by GUI.
Operation mode : PWM → PH/EN
Wake : Disable → Enable
ITRIP : Enable → Disable ( They do not use the ITRIP function!)
IN1 Duty Cycle : 0% → 100%
Slew Rate : 53.2 → 2.6V/us
Motor Controls : Forward → Reverse

The customer start the motor
Motor Control : Stop → Start
(Perhaps, they change the Output State, too : Disable → Enable)
Then the motor rotate normally.

Next, they stop the motor.
Motor Control : Start → Stop
Wake : Enable → Disable

10 seconds past, they start the motor again.
Wake : Disable → Enable
(They change only Wake button. They do not change the Motor Control)
Then the motor do not rotate, but slightly vibration.

They repeated to change the Wake button : Disable → Enable → Disable → ...... several time.
Then the DRV8873H burn out. It occur at OUT2 ( 14, 15 pin)
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If I get a picture of the EVM, I will let you know.

Best Regards,
Naoki Aoyama

Hi Rick-san,

I got a picture of the EVM.

I attach it.

Could you check the board?

(The DRV8873 has been removed in above picture.)

Best Regards,

Naoki Aoyama

Hi Rick-san,

Thank you for your investigation.
I will suggest the customer to use 13V/us or 53.2V/us.
They should use the current regulation for a large start up current.

Thanks,
Naoki Aoyama