BQ24171: the battery is not charged, the indicator light flashes

Tonyx.wu

Part Number: BQ24171

Charging IC startup test results: MOS is normally turned on, VREF (3.3V), vregn (6V), TS pin voltage is about 2.6V, SW has no waveform and is in the state of continuously pulling up 7.8v

over 3 years ago

0 Michael Emanuel35 over 3 years ago

TI__Mastermind 40305 points

Hello,

The issue here is the TS pin is not properly biased. Currently the TS pin is 2.6 V, or 78.79% of VREF. At this voltage the TS pin suspends charge (any % of VREF above 70.8% typical). Please use a thermistor to bias the TS pin correctly for battery temperature sensing, or permanently bias the TS pin in the valid voltage range. Please refer to Section 9.3.18 for more details.

Thanks,

Mike Emanuel

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0 Tonyx.wu over 3 years ago in reply to Michael Emanuel35

Genius 3895 points

TS modifies the permanent bias to charge, but it will stop charging after charging to 8.31v. Please help to see what causes it. thank you!

0 Michael Emanuel35 over 3 years ago in reply to Tonyx.wu

TI__Mastermind 40305 points

Hello,

Can you please measure the FB pin when this is happening? What is the STAT pin doing? What is the input voltage at this time?

Thanks,

Mike Emanuel

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BQ24171: the battery is not charged, the indicator light flashes