BQ2970: bq2970 OCP Test

Ian Wang

Mastermind 29750 points

Part Number: BQ2970

Hi Sir,

Customer asked how to test bq2970 OCP and test condition?

Would you pls help for sharing?

Thanks, Ian.

over 4 years ago

0 WM5295 over 4 years ago

TI__Guru 54715 points

Hi Ian,

For the BQ2970 device the overcharge current protection OCP or charge overcurrent detection can be tested as described in the data sheet section 8.2 https://www.ti.com/document-viewer/BQ2970/datasheet/test-circuits-slusbu95242#SLUSBU95242 item 18 using circuit 5 in https://www.ti.com/document-viewer/BQ2970/datasheet/test-circuit-diagrams-slusbu95215#SLUSBU95215

In practice with a board assembly you may need to provide power to the battery side through a resistor and connect an electronic load set to limit the voltage either at a slight higher or lower voltage than the supply depending on how much current you want to allow in the resistor. Then apply a high current/voltage charger on the PACK side to force current through the circuit into the load causing the threshold to trip. You may have 2 passes, one increasing current slowly to find the threshold, another applying a step above the threshold to check the response time.

Hope this helps.

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BQ2970: bq2970 OCP Test