BQ24032A Charging Termination

Jake Jung

Expert 1915 points

Hi Tiers.

My schematic is below.

When USB Input, charging termination is good at 11mA.

But When AC Input, charging termination is not completed. charging state under 11mA and keep charging on.

So I changed R195 (7.4K Ohm -> 5.1Kohm), and then charging termination is completed under AC input.

I want to know why.

Please let me know.

Thank you.

over 7 years ago

0 Jing Zou over 7 years ago

TI__Mastermind 19430 points

I am assuming you are referring to R198 not R195. Seems like when using AC input, the output is hitting DPPM threshold. Termination is disabled in DPPM mode.

What is your configuration on PSEL? there are two resistors on PSEL. one pulled up and one pulled down. Which one of those is installed?

Can you provide scope capture on VBAT, VOUT, IBAT, IBAT, preferably on the same scope capture?

0 Jake Jung over 7 years ago in reply to Jing Zou

Expert 1915 points

PSEL is pulled down.

When using USB input, why this issue is not occured?
What resistor value you recommend?

0 Jing Zou over 7 years ago in reply to Jake Jung

TI__Mastermind 19430 points

What is your current limit setting on the power supply? Can you show the scope capture on VBAT, VOUT, IBAT, IBAT when the load is turned on for AC only and USB only?

Power management

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BQ24032A Charging Termination