BQ25820: Battery Manager

Manfred Wachter

Part Number: BQ25820

Tool/software:

Hallo

We are using the BQ25820 similar as on the EV-Kit. Which solution could you suggest to implement a soft start at the Q5 to reduce the inrush current during switch on of Q5.

Thanks

Manfred

2 months ago

0 Christian Moyer 2 months ago

TI__Mastermind 35246 points

Hello Manfred,

C9, needs to be experimentally derived to slow down the Q5 and Q6 turn-on time.

Best Regards,

Christian.

0 Manfred Wachter 2 months ago in reply to Christian Moyer

Prodigy 165 points

Hello Christian

Thanks for answering.

Is it correct, that this FET should turn on as soon as VAC reaches the 4.4V (if the ACUV pin is connected to VAC, and the ACOV pin is connected to PGND) or is there a delay between ?

Does it make a difference in switching on (voltage/timing), if the pins ACUV and ACOV are connectet with resistors (R21/R30 to VAC /PGND and R27 removed)

Thanks

Manfred

0 Christian Moyer 2 months ago in reply to Manfred Wachter

TI__Mastermind 35246 points

Thanks for posting. It was US holiday on Monday. A team member will look into this and get back to you tomorrow

0 Christian Moyer 2 months ago in reply to Christian Moyer

TI__Mastermind 35246 points

Hello Manfred,

Manfred Wachter said:
Is it correct, that this FET should turn on as soon as VAC reaches the 4.4V (if the ACUV pin is connected to VAC, and the ACOV pin is connected to PGND) or is there a delay between ?

Yes, This is correct the FET should turn on as soon as VAC reaches the 4.4V. There will be a short deglitch time of 5-10ms.

Manfred Wachter said:
Does it make a difference in switching on (voltage/timing), if the pins ACUV and ACOV are connectet with resistors (R21/R30 to VAC /PGND and R27 removed)

The voltage will be based on ACUV not 4.4V. The timing should be the same.

Best Regards,

Christian.

Power management

Power management forum

BQ25820: Battery Manager