BTN8982ta Current calculation

saran · ‎Oct 04, 2021

I am using BTN8982TA IC. In that IC, i am getting voltage as 1.93 in IS pin, and i am using Rs as 3.6K.

How to calculate IL load current by using these values?

How to find the dkilis value?

MMA · ‎Oct 05, 2021

Hi,
please have a look at the datasheet of the device. You can find it under below link. Rs of 3k6 seems too high. We usually recommend 1k. The IS pin provides a current which consists of two components:
- offset current
- sense current which is ILOAD/dKilis.

The offset current can be measured when the low side switch is active (IN =0) and this value need to be substracted form the IS when high side is active. Current sensing is only active when high side switch is active.
https://www.infineon.com/cms/en/product/power/motor-control-ics/brushed-dc-motor-driver-ics/single-h...

On the above web page you can find application notes and simulation tools in addition.
Best regards

mma

View solution in original post

MMA · ‎Oct 05, 2021

Hi,
please have a look at the datasheet of the device. You can find it under below link. Rs of 3k6 seems too high. We usually recommend 1k. The IS pin provides a current which consists of two components:
- offset current
- sense current which is ILOAD/dKilis.

The offset current can be measured when the low side switch is active (IN =0) and this value need to be substracted form the IS when high side is active. Current sensing is only active when high side switch is active.
https://www.infineon.com/cms/en/product/power/motor-control-ics/brushed-dc-motor-driver-ics/single-h...

On the above web page you can find application notes and simulation tools in addition.
Best regards

mma

BTN8982ta Current calculation

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Re: BTN8982ta Current calculation