BQ24610: BQ24610: ACFET can not turn on

Star Xu

Part Number: BQ24610

The customer design with 5 strings of 21V charging circuit, adapter voltage 24V, charging current 2A, pre-charging current 0.2A, adapter current 3A.

The problem is as follows: the adapter is not plugged in, the battery power supply is normal, and the battery voltage is 17.8V.

Plug in the adapter power supply and still use 17.8V battery power. Measure VREF=3.3V, VCC=23.6V, Vce = 3.3V, Vregn = 6V, and both STAT1 and STAT2 voltages are about 5V. However, the voltage of ACDRV is always close to the voltage of VCC, causing the ACFET can not turn on.

How to solve this problem?

Thanks

Star

over 3 years ago

0 Michael Emanuel35 over 3 years ago

TI__Mastermind 36245 points

Dear Star,

The customer programmed the battery voltage to be 16.8 V. If you plug in a 17.8 V battery, there will be no charging.

Thanks,

Mike Emanuel

Please click "Resolved" if this answered your question.

0 Star Xu over 3 years ago in reply to Michael Emanuel35

TI__Genius 9645 points

Hi Mike

Thanks for your reply.

When the adapter is not plugged in, the battery power supply is normal, and the battery voltage is 17.8V.

Plug in the adapter 24V/3A, the battery can not charge. ACFET not turn on.

Thanks

Star

0 Michael Emanuel35 over 3 years ago in reply to Star Xu

TI__Mastermind 36245 points

Dear Star,

As stated before, if you have a 17.8 V battery and the programmed regulation voltage is 16.8 V there will be no charging because you are above the regulation voltage.

Thanks,

Mike Emanuel

Please click "Resolved" if this answered your question.

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BQ24610: BQ24610: ACFET can not turn on