We recently used a TPS54334 to repair a Sony SA-CT290 Active Subwoofer with Bluetooth sound bar
The TPS54334 is a 28-V, 3-A, low quiescent supply current (IQ), synchronous monolithic buck converter with integrated MOSFETs.
The TPS54334 enables small designs by integrating the MOSFETs and implementing current mode control to reduce external component count.
DataSheet: Click here
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