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Hi
Customer do some test with BQ4050.
BQ4050 was in sleep mode, and the DSG MOS is open. doing the short test and found that the short circuit will recover briefly.
Please refer to the following waveform.
Does this normal, waiting for your reply.
Thanks
Star
Hello Star,
Star Xu said:BQ4050 was in sleep mode, and the DSG MOS is open
I believe you meant DSG FET is closed based on your scope plots. DSG is going from ON to OFF when the short circuit is applied.
Star Xu said:Does this normal, waiting for your reply
Yes the behavior is normal based on the recovery time. Then the DSG FET turns off the short circuit current drops to 0 then the fault clears and the DSG FET turns ON, since the short circuit condition is still present it will cause the DSG FET to turn OFF again. The DSG FET will continue to toggle ON and OFF. There's a way to make the DSG FET latch OFF after toggling a number of times ASCDL. For OCD it can be latched by setting the recovery current threshold positive, which would require a charger current to recovery from the condition.
Please refer to TRM: http://www.ti.com/lit/ug/sluuaq3/sluuaq3.pdf
Hi Damian Lewis
Thanks for your reply.
But the time grid of the waveforms is 2ms, the recovery delay we set is 60s, I don't think it recovers normally.
Based on the settings, the expected behavior is, DSG FET turns off when short occur, after 60s, if the short circuit condition is still present, DSG FET turns off again, until 5 times, the DSG GET is latched off.
While known form the pic I posted, DSG FET recovers in about 6ms after short protection. Is it possible that the firmware turns on DSG FET by mistake when exitting sleep mode?
Thanks Star
Hello Star,
What is you OCD protection set to? Are you logging Safety Status A + B to determine which protection that was tripped? Please check all possible protection delays and recovery as ASCD, etc.
If you want to share gg we can look at it as well, but it's best to know which protection is triggered by the short circuit event. It will help you to find the answer/explanation.
Hi
Attached the gg file for your reference.
* Texas Instruments Data Flash File * File created Tue Mar 10 09:38:32 2020 * * Device Number 9E34 * Firmware Version 0.01 * Build Number 22 * Order Number 0 * * bqz Device Number 9e34 * bqz Firmware Version 0.01 * bqz Build Number 22 * * Field Order: Class name, Subclass name, Parameter name, Parameter Value, Display Units "Calibration","Voltage","Cell Gain","12154","-" "Calibration","Voltage","Pack Gain","49540","-" "Calibration","Voltage","BAT Gain","49161","-" "Calibration","Current","CC Gain","0.992","mOhm" "Calibration","Current","Capacity Gain","0.992","mOhm" "Calibration","Current Offset","CC Offset","0","-" "Calibration","Current Offset","Coulomb Counter Offset Samples","64","-" "Calibration","Current Offset","Board Offset","0","-" "Calibration","Current Offset","CC Auto Config","07","hex" "Calibration","Current Offset","CC Auto Offset","281","-" "Calibration","Temperature","Internal Temp Offset","0","°C" "Calibration","Temperature","External1 Temp Offset","0.3","°C" 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Thanks
Star
Hello Star,
Is the short circuit test a pulsed short every 6ms or so? I'm looking at the DSG VGS an it doesn't correlate with the pulses on the current and output voltage. Can you also include the CHG VGS?
