I have a Planet Audio 4 channel that was playing fine and simply cut off. It does not power up at all so I popped the top an traced the fault to the S494P PWM chip where the ign +12 voltage stops at pin #12 vcc input.

Imagine that, a pulse width modulation chip that is used in switching power supplies as the main building block, and me with an amp that won't turn on..... I bet that's never happened before. :laugh:

So anywho, I've been out of the game for a good while, but looks like I remember everything. The repair won't be an issue, just drop a new IC in it.

Now my question.......

#1- anyone else have issues with this IC?

#2- anyone have a recommended distributor that'll ship me just one hassle free?


Thanks!

 

Never used this IC before. McIntosh amps use their own in house PWM switching array. That's why they still keep cranking after many many decades.

As for a distributor, IF Digikey carries them, they're usually excellent. Do they give a distributor listing?