TPS92515HVEVM-749: TPS92515HVEVM-749

Sana rezgui

Intellectual 400 points

Part Number: TPS92515HVEVM-749
Other Parts Discussed in Thread: TPS92515

Hello,

I have tried to connect PWM (after having set the right jumpers) and it damaged the board.

Any insights?

Thanks.

Sana

over 6 years ago

0 Irwin Nederbragt over 6 years ago

TI__Mastermind 28655 points

Hello Sana,

Did you remove R14?

"3.2.1.5 TP3, PWM
The PWM test point connects directly to the PWM pin of the TPS92515. Leave R14 connected for normal
operation. If PWM dimming is used, remove R14 and apply a square wave with a low level of GND and a
high level of between 2.5 V and 5 V. The dimming frequency range is 100 Hz to 10k Hz."

did you make sure the signal was below 5.5V and referenced correct?

Best Regards,

0 Sana rezgui over 6 years ago in reply to Irwin Nederbragt

Intellectual 400 points

Hi Irwin,

I did all of that. The signal was 0-5V, freq. 10KHz.

Thanks.

Sana

0 Sana rezgui over 6 years ago in reply to Sana rezgui

Intellectual 400 points

Hi Irwin,

Just a minor correction, I did not remove R14. I was not planning to carry on with teh EVM recommendations but because of the failure more, I've stopped.

Thanks.

Sana

0 Irwin Nederbragt over 6 years ago in reply to Sana rezgui

TI__Mastermind 28655 points

Hello Sana,

R14 is a zero ohm resistor, PWM is shorted to VCC. It cannot dim this way. I am not sure what will happen if you drive PWM when it is shorted to VCC. It would depend on the impedance of the PWM source.

Best Regards,

0 Sana rezgui over 6 years ago in reply to Irwin Nederbragt

Intellectual 400 points

Hi Irwin,

I did not remove R14 before connecting it to the PWM. That is what probably damaged the part. This resolves the issue. Thanks.

Sana

Power management

Power management forum

TPS92515HVEVM-749: TPS92515HVEVM-749