BQ24073: Whether the charging current can be changed.

Downey Kim

Expert 2675 points

Part Number: BQ24073

Hi TI,

I want to set the charging current differently depending on the temperature.

A circuit that synthesizes parallel resistors with TR was constructed. See circuit below.

Is there any problem changing the ISET resistance value during charging?

Does the charging current change when the resistance value is changed during charging?

Please check it..

Thanks,

Downey Kim

0 Raheem over 5 years ago

Hello,

Yes you can change the charge current while charging.

Can you upload a higher quality mage. That one is hard to read.

0 Downey Kim over 5 years ago in reply to Raheem

Expert 2675 points

Hi Raheem,

Thank you for your answer.

Attached SCH(PDF).

We will modify R47, R12.

R47 -> 3.9k

R12 -> 8.9k

Normal operation : MCU turn on Q6. set charging current with R47, R12 parallel resistors.

Operates at temperatures below 10 : Turn off Q6. set charging current with R12 resistor.

Please check if there are any problems.

Thanks,

Downey Kim.

0 Raheem over 5 years ago in reply to Downey Kim

Hello,

I dont see any issues with the schematic.

However, the open drain pins of PGOOD and CHG dont need capacitor.

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