DRV8163-Q1: R(IPROPI) Calculation

Anjana Vijayan

Prodigy 80 points

Part Number: DRV8163-Q1

Tool/software:

For DRV8163-Q1 designed for a 48V system with SPI communication, how is R(IPROPI) calculated ?

5 months ago

0 Joshua Horlander Cruz 5 months ago

TI__Mastermind 24260 points

Hi Anjana,

The below calculation can be used to calculate an appropriate value for R(IPROPI):

ITRIP is the current regulation point, V(ITRIP) is a user selected setting in the CONFIG2 register (0xB) bits 0-2, and A(IPROPI) is ~212 uA/A.

Let me know if any more assistance is needed.

Regards,

Joshua

0 Anjana Vijayan 4 months ago in reply to Joshua Horlander Cruz

Prodigy 80 points

For our application load current is only of 0.3A (ITRIP), taking VITRIP as 1.65 and A(IPROPI) as 202uA/A, the R(IPROPI) is about 27kohm. Is this resistor value feasible for the proper working of the half bridge?

0 Joshua Horlander Cruz 4 months ago in reply to Anjana Vijayan

TI__Mastermind 24260 points

Hi Anjana,

There should be no issues with using a 27kOhm resistor on IPROPI, the only issue maybe a decrease in IPROPI accuracy. I would recommend testing this on our DVR8163S-Q1EVM to make sure that the performance of the DRV8163-Q1 with this large of a resistor will meet your requirements https://www.ti.com/tool/DRV8163S-Q1EVM.

Regards,

Joshua

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DRV8163-Q1: R(IPROPI) Calculation