CCS/BQ40Z50-R1: BQ40Z50-R1 short problem

user4005074

Part Number: BQ40Z50-R1
Other Parts Discussed in Thread: BQ40Z50

Tool/software: Code Composer Studio

BQ40Z50-R1 short circuit in discharge voltage is 0.2V maximum when RSNS set 1, and negatinve resistance is 0.001 ohm. It's means the maximum detection current is 200A when short. So, if we have a big capcity battery, like 50Ah, when we test short, the current must bigger than 200A. now, what happens?

Can BQ40Z50-R1 detects a voltage greater than 0.2V and activates short circuit protection or not detect this voltage and do nothing?

In addition, BQ20Z95 short circuit voltage is 0.475V and BQ2095 has ASRP ASRN can do partial voltage when short circuit is bigger than 0.475V.

Why BQ40Z50-R1 short circuit voltage is designed to be so small?

over 4 years ago

0 user4005074 over 4 years ago

Prodigy 60 points

And when we have a big battery , like 50Ah, how do we design it

0 Nick Brylski over 4 years ago in reply to user4005074

TI__Mastermind 19195 points

Hi,

We have an app note here that discusses design configuration for high capacity/ high discharge. These will also apply for bq40z50, you will need to manually scale current.

slua760_BQ34Z100-G1-High Cell Count and High Capacity.pdf

Best,

0 user4005074 over 4 years ago in reply to Nick Brylski

Prodigy 60 points

Pls answer the below questions

1. Can BQ40Z50-R1 detect discharge short circuit voltage when it's small than -0.2V and act short circuit protection turn off CHG and DSG MOS FET or DO NOT detect discharge short circuit voltage and do nothing?

2. IF NOT, when the discharge short circuit voltage is small than -0.2V, how do we design it.

3. In addition, BQ20Z95 short circuit voltage is -0.475V and BQ2095 has ASRP ASRN can do partial voltage when short circuit is bigger than 0.475V.

Why BQ40Z50-R1 short circuit voltage is designed to be so large?

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CCS/BQ40Z50-R1: BQ40Z50-R1 short problem