TIDA-010208: 48V BMIC BQ76952 Design

sung jin park

Prodigy 130 points

Part Number: TIDA-010208
Other Parts Discussed in Thread: BQ76952,

Tool/software:

For the design of 48V BMIC BQ76952, we are referring to TIDA-010208.

When you do cell balancing with an external FET

Where should I change the resistance value to adjust the current capacity?

Can you let me know based on the picture below?

10 months ago

0 Abhijith V Narayan 10 months ago

Intellectual 626 points

Hello Sung Jin Park,

R1, R2 are your bleed resistors and modifying the value of this adjusts the balancing current. Two resistors are used in parallel here to share the power dissipation.

Please check the Cell Balancing With BQ769x2 Battery Monitors app note for further information.

Best,
Abhijith

0 sung jin park 10 months ago in reply to Abhijith V Narayan

Prodigy 130 points

I want to replace the resistance of 40.3 ohms, which is the composite resistance of R1,R2.

What do you think of replacing it with the 50 ohm resistance of the Wide terminal type?

Don't you recommend it?

0 Abhijith V Narayan 10 months ago in reply to sung jin park

Intellectual 626 points

Yes,

Based on your balancing current requirement you can size the resistors. No concerns from the AFE side for 50Ohms as the value or the package.

Best,

Abhijith

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TIDA-010208: 48V BMIC BQ76952 Design