DRV8244-Q1: Simulation problems

Marin Stevic

Part Number: DRV8244-Q1

Hi,

I am having trouble with simulating the DRV8244-Q1 H variant.

I have made a simple schematic that you can see below. The problem is that there is almost nothing on the output.

The NFAULT pin goes HIGH after sending the correct startup sequence on the NSLEEP pin (30us LOW, so that means that it clears faults and doesn't go to sleep).

Also the MODE pin is directly connected to GND which means it is operating in the PH/EN mode.

If someone can check the schematic and give any input it would be appreciated.

Below is the differential voltage between OUT1 and OUT2 from the simulation:

Regards,

Marin

over 2 years ago

0 Audrey Kuehler over 2 years ago

TI__Intellectual 1040 points

Hello Marin,

I'm going to look into this, but one initial observation - why do you have a pull-down resistor on DRVOFF?

0 Marin Stevic over 2 years ago in reply to Audrey Kuehler

Prodigy 20 points

Hi Audrey,

I accidentally left that resistor there on the DRVOFF when I was testing something, but even when it is removed and DRVOFF is connected directly to GND it still doesn't work as intended.

0 Audrey Kuehler over 2 years ago in reply to Marin Stevic

TI__Intellectual 1040 points

Hello Marin,

Can you try the following debug steps one at a time.

1. Disable ITRIP by tying to ground and run the simulation

2. Test the polarity on the output and confirm the voltage on OUT1 and OUT2

3. Confirm the voltage on the inputs (EN/IN1, PH/IN2, and V1)

4.Remove the load and run the simulation again

I have attached a screenshot of what the outputs/inputs are supposed to look like.

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DRV8244-Q1: Simulation problems