OPA4277 Troubleshooting and Application Analysis
Explore OPA4277 issues in ESS systems and solutions. Understand parameters causing faults, compare with OPA4171, and get recommendations for usage in buffering and signaling. Discover why OPA4171 excels in similar applications.
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Presentation Transcript
OCP Fault Triggered During Battery is discharged on Storage System TI Confidential NDA Restrictions
Application: ESS system Customer: WW Class Device: OPA4277 TI Confidential NDA Restrictions
Problem 1: Issue Description: When battery is in discharge mode, the over current protection would be fault Triggered. Schematic of the Current feedback TI Confidential NDA Restrictions Confidential 3
Verification Test to problem 1: ~ 20KHz freq. Ch2(Red) Inductor Current Ch3(Blue) Feedback signal of the IBTMAX) Good N.G 1st Source(OPA4171AIDR) Waveform Analysis 1. The freq. of the abnormal waveform is 20KHz which is identical to system inverter s working freq. 2. It looks the OPA4277 device is influenced by the inverter system s PWM working frequency. It leads to the feedback signal of the IBTMAX abnormal and general the spike to cause the fault over current protection. 2nd Source(OPA4277UA/2K5) TI Confidential NDA Restrictions Confidential 4
Problem 2: Issue Description: When using OPA4277UA as the buffer stage with 3.3V input, the measured voltage is close to 2V at C2000 s Pin 35/37/53/55. However, when using OPA4171AIDR The voltage measurement is 3.3V. C2000 TI Confidential NDA Restrictions
Summary: 1. What re the parameters of the OPA to cause the problem possibly? 2. Is the OPA4277 able to use on applications of the ref. Buffer, signaling and so on? What s suggestion? 3. Why OPA4171 has No problem with this application? TI Confidential NDA Restrictions
