BQ25756EVM: IAC_ADC Value error

Vamsi Tungala

Part Number: BQ25756EVM

Tool/software:

Hi

I am using BQ25756EVM, when i am charging a battery 4s, Input current in bench power supply showing 1250mA but the IC is showing 390mA. what might be the issue here.

5mOhms sense resistor is there on EVM.

Thank you

6 months ago

0 Ethan Galloway 6 months ago

TI__Mastermind 31095 points

Hello Vamsi,

Thanks for working on this.

The ADC is intended to be used as a general indicator of the voltage and current. For better accuracy, I would recommend a current sense amplifier or a current meter.

You can see this FAQ for more details. We also have a general FAQ for the BQ2575X part family here.

Let me know if you have any other questions about the part.

Best Regards,
Ethan Galloway

0 Vamsi Tungala 6 months ago in reply to Ethan Galloway

Prodigy 55 points

Thank you for the clarification.
So, A s per my understanding we should not depend on that ADC values for input current values, instead we better use external sensor to get accurate values.
please correct me if i am wrong.

+1 Ethan Galloway 6 months ago in reply to Vamsi Tungala

TI__Mastermind 31095 points

Hello Vamsi,

Yes, that is correct.

Best Regards,
Ethan Galloway

Power management

Power management forum

BQ25756EVM: IAC_ADC Value error