This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Part Number: BQ2970
I'm posting this question on behalf of my customer.
I am considering using the bq2970 protection chip on an up-coming battery project. The battery may deliver current pulses higher than the over current discharge but only for a fraction of a millisecond, less than the OCD trip time. I do not want the OCD to trip for this known pulse. The concern is if two high current pulses 20ms apart could accidentally trip the protection.
I wanted to verify, during an over current event, does the bq2970 continually monitor the voltage across the FETs? (Instead of only checking on the voltage at the start and end of the over current delay time)
The device's behavior during over current discharge is described in section 9.4.4 of the datasheet. For this fault to be triggered, the difference between the V- pin and the VSS pin has to be greater than Vocd for a time longer than the discharge over current delay. This delay value is programmable and can be 8 ms, 16 ms, 20 ms, or 48 ms. If the fault only occurs for a fraction of a millisecond, the fault should not trigger. Even if the two faults happened at exactly 20 ms apart (if that is your programmed delay), I doubt the fault will trigger.
TI provides design resources and design advice (including technical, schematic, code and/or system review) “as is” and with all faults. All information in this or related correspondence is provided subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.