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TPA3255: output power with 4ohm load

Part Number: TPA3255

Hi:

My customer use TPA3255 PBTL for mono 130W with 8ohm load and 160W with 4ohm load output. For 8ohm load the output power can output 130w normal, but change to 4ohm load, the output cliped around 130W output. the 4ohm load cliped video as below. I let customer checked the heat sink and the ocp setting, there is no erro. could you help analysis where I will check ?171203 MKA-100BT AMP(tpa3255) SCH.pdf