BQ24650EVM charge current

Gaurav Sharma2

I have tried to use the above mentioned EVM for charging a 12.6 V battery which is discharged to 11.5 V in the starting.

i observed that voltage at the output of the EVM was as mentioned 12.6 V but the current in circuit was almost 0 Amp.

please tell me the possible reasons. i have also tried to connect the above EVM from two different power sources and i got the same results.

i.e current is not flowing into the circuit. Whereas as per factory setting i should see 0.2 Amp in starting which becomes 2 Amps after 30 mins.

Thanks

0 Charles Mauney over 11 years ago

Look at the VFB pin and make sure it is lower than 2.1V (if above the charger things the battery is above full).

Look at the TS pin and make sure it is within the operating range (needs 10k thermistor).

IS the term en pin pulled to VREF?

Is the MPPSET above 1.2V (below 1.2V it thinks the source is overloaded and reduces the charge.

0 Hyeon-Bo Park over 11 years ago in reply to Charles Mauney

Excuse me..

We have a same problem.

But I can't understand your answer..

What is VFB pin???

And IS TS pin [J2 TS] or [TEST POINTS TS]?

Can you explain how to check in detail??

0 Martha Davel over 11 years ago in reply to Hyeon-Bo Park

Hey buddy to get more information regarding the VFB pin, please refer the manual.

0 Hyeon-Bo Park over 11 years ago in reply to Martha Davel

Thank you!!

I found VFB pin by searching internet.

But I have a one more question.

How to connect thermistor???

I can't find how to connect thermistor in datasheet.

Can you tell me how to connect this??

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