TPS2493: Strange behaveor of UVEN and OV pins

Ole Martin Vister

Part Number: TPS2493

Hi.

We are using the TPS2493PWR for a hotswap circuit. The application voltage is set to 24V, with undervoltage enable at 18V and over voltage at 32V.
When we use the guide in the datasheet, we get the following values for R1, R2 and R3: 220k, 6.8k and 10k.

However when we are testing the design in the lab, we see that UVEN and OV actually triggers at 2V, instead of 1.25-1.35 stated in the datasheet.
This means that the opperating window is from 29V and upwards, which is too high for our application.

Is this an error in the datasheet, or is this an error in the batch of TPS2493PWR we got?

over 1 year ago

0 Avishek Pal over 1 year ago

TI__Mastermind 38870 points

Thanks for reaching out.
Please measure the following voltage on another three different TPS2493 devices. I'd like to see the repeatability.

1) Reduce the VIN from 24V to 0V and measure or capture the UVEN pin voltage at the instant the GATE starts drooping
2) Increase the VIN from 24V to 40V (suppose) and measure or capture the OV pin voltage the instant the GATE starts drooping