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TPA0211: A leak sound from a speaker during SE Mode.

Part Number: TPA0211

I am using TPA0211 for new design. I have a problem which a leak sound from a BTL tied speaker during Earphone mode. Sound volum is not so big ,but semms strange. The swicching circuit of SE/nBTE is same as Datasheet.  It seems Output impedance of VO- is enough high.

1)Are there any check point or advices?

2) Is there a specification of leakage sound raio between BTL and SE.

* Condition 

VDD=4.5V,SP:8ohm,Ear-phone: 16ohm

VSE(Hi)=4.45V,VSE(Lo)=0.05V

/ Hiroshi Furuno