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TPA3138D2: sync question about TPA3138D2

Part Number: TPA3138D2
Other Parts Discussed in Thread: TPA3100D2, TPA3118D2

Hi Sir,

 My customer is interesting about sync function in TPA3138D2. Please help to check below questions.

1. Why there need 4.7k resistor between two TPA3138D2?

2. Is there need a resistor between TPA3100D2 for device sync?

3. Can TPA3100D2 sync with TPA3138D2?


Best regards,

Gary Teng