Impact of Abnormal Output PWM on Product Damage and Solutions
Discover the diagnostic procedures and simulation tests conducted on abnormal output PWM PCBA, identifying the cause as the BQ8050 chip. While attempting to reproduce the abnormality on normal PCBAs, the impact of product damage is evident, posing risks of a full recall. Explore possible solutions and suggestions from TI in mitigating the issue.
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Presentation Transcript
schematic diagram Schematics PWM connection circuit
PWM waveform of normal sample and abnormal PWM waveform of damaged sample Normal PWM waveform Abnormal PWM waveform
Diagnosis procedure(including swap test) on the output PWM abnormal PCBA 1.In the PC6 output PWM abnormal PCBA,We test to check if the cause of the PCBA abnormal is the BQ8050 chip itself a) Change the RC6 pin output PWM abnormal BQ8050 to the good PCBA for testing, and the good PCBA PWM function is abnormal. b) Change the RC6 pin output PWM normal BQ8050 to the bad PCBA for testing, and the bad PCBA PWM function is normal. c) Change the RC6 pin output PWM abnormal BQ8050 to the other bad PCBA for testing, and the bad PCBA PWM function is abnormal. 2.In addition to the RC6 pin function is abnormal, the other pins function is normal,such as communication, sampling Conclusion:The cause of the PCBA abnormal is the BQ8050 chip itself
Other simulation tests on the output PWM normal PCBA We also did other simulated damage tests on the output PWM normal PCBA ,try to reproduced this phenomenon 1.Test ESD :From contact 6K, air 8K, gradually increase to 24K, 2.Short-circuit :Pin RC6 with PWM output is short-circuited to B- 1 hour 3.External high positive voltage:Apply a positive voltage of 10V to RC6 externally for 30 minutes 4.External high negative voltage:Apply a negative voltage of 5V to RC6 externally for 10 minutes However, the PWM abnormal can t be reproduced
The impact of the output PWM abnormal product There was massive product damage(up to 4%) have risking of a full recall. Does TI have any suggestions or solutions? Thanks
