DRV8244-Q1: Brake operation of brushed DC motor in PWM mode

Hello,

My customer is evaluating DRV8244-Q1 with the EVM.

Then they are facing a problem for the brake operation with a brushed DC motor.

According to the datasheet, the required IN1 and IN2 pattern in the PWM mode for brake operation is opposite, 0/0 for production sample and 1/1 for pre-production sample.

I’m not sure which sample is put on the EVM they are using, but they tested both IN1/IN2 = 0/0 and 1/1. It means they have tested both OUT1/2 = Hi-Z/Hi-Z and HIGH/HIGH.

Then then couldn’t see so much difference in both 0/0 and 1/1 setting and both were not like a brake operation. The motor continued to spin by its inertia in both setting.

So they couldn’t feel so-called brake operation with both setting.

DRV8244-Q1 uses high-side recirculation.

Then they tested with other motor driver IC using low-side recirculation like DRV8701(EVM) and others.

With these devices, the motor stopped soon after setting LOW/LOW outputs.

Then they have 2 questions.

1.

Regarding the brake effect, is there so much difference between high side recirculation and low side recirculation?

2.

They couldn’t feel brake effect in DRV8244-Q1.

Do you know the reason?

Regards,

Oba