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TPA3255: TPA3255如何实现闭环反馈?

Part Number: TPA3255

TPA3255如何实现闭环反馈?根据TPA324x and TPA325x Post-Filter Feedback文档画好PCB,电路无法正常工作(PWM振荡一下就停止了),把反馈回路断开就能正常工作。有哪些地方需要注意?有没有关于反馈回路更详细的设计参考?