BQ24616EVM: NO charging

Amir Eshraghi

Expert 1270 points

Part Number: BQ24616EVM

I just purchase the BQ24616EVM and the unit is not charging and stat light is off.

* Vin is 20V-24V,

* Battery is 4 cell series 3.7V per cell. Vbat is set for 15.2V

* ACDRV , CE, PG Led is ON.

* No current is drawn from VIN

* It seems the charging is been disable.

* REGN is 6V

* Stat1 and 2 is 1.7V

* ISet1 is 0.599

* ISet2 is 0.299

Please let me know if you need any other data

What could be the issue?

Thank you

over 5 years ago

0 Kedar Manishankar over 5 years ago

TI__Mastermind 24075 points

Hi Amir,

Is TS pin voltage in the valid range to charge?

0 Kedar Manishankar over 5 years ago in reply to Kedar Manishankar

TI__Mastermind 24075 points

Also 3.7V is usually nominal battery voltage and not max charge regulation voltage. The divider on VFB has to be adjust such that it is equivalent to max charge regulation voltage.

0 Amir Eshraghi over 5 years ago in reply to Kedar Manishankar

Expert 1270 points

Hi Kedar,

TS pin is 2.525V when Supply between TS and GND is off.

Base on test setting I suppose to keep supply off.

Also, I set charge voltage to be 15.28V did not work, even default 20V still nothing.

Note: My battery unit is 4 cell battery pack with BMS unit.

Thank you

0 Amir Eshraghi over 5 years ago in reply to Amir Eshraghi

Expert 1270 points

I think I found out ts level is too high.

0 Kedar Manishankar over 5 years ago in reply to Amir Eshraghi

TI__Mastermind 24075 points

Hi Amir,

Turn the TS supply on, and make sure that the TS voltage is within the spec as defined in the thermistor comparator section of the datasheet.

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BQ24616EVM: NO charging