TPS92515-Q1: IL-Peak Different when Test with Same Board

Xiaowei Zhang

Part Number: TPS92515-Q1

Tool/software:

Hi team,

My customer Valeo are using TPS92515-Q1 for their project. And they found when test with same board at different power cycle, they found the IL-peak sometimes is different, causing output current accuracy can't meet requirement.

Refer to the formula in the datasheet, it seems related to VCST_Offset, tDEL. So my question is for the specific single IC on customer's board, will the VCST_Offset, tDEL value changed at different test power cycle, Power cycle means power on and off? If not , can you please provide more ideals about why this happen?

Best Regards,

Xiaowei Zhang

5 months ago

0 Xiaoguang 5 months ago

TI__Genius 17520 points

Hi, Xiaowei,

You already listed factors that might affect current accuracy in the formula. For example, Rsense, inductance else varies with temperature and types.

Also, trace resistance can have an impact on accuracy, so care should be used when routing the traces to VIN and CSN from the sense resistor. Because the sense resistor value is typically in milli-ohms, use a short kelvin connection to CSN and place the sense resistor as close as possible to VIN.

The measured accuracy is +/-2.6%, it seems fine.