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Message: <blockquote data-quote="tropos_net" data-source="post: 514758" data-attributes="member: 2595">you are completely confused of what Vcc and Vs values mean which are stated there in the spec sheets.- Vs is source voltage which is refering to the outside of the box voltage requirement ie. batt feed (pin#9)- Vcc is the positive rail which goes into the chip. the chip gets fed by the DC/DC convertor not pin#9 i have point out that pin#9 of the head unit DOES NOT go directly into Vcc pin of chip because the chip does not work with 12.2 - 14.4 Vdc.   the TDA7560 needs 10amps at full power whereas the TDA7385 needs 5amps at full power. there is a 100% increase in input current requirement so go figure if "it needs a littke more current".</blockquote>