1. Why?
2. That really depends on the behavior of the power supply, the specific Class D implementation/IC, and the supporting circuitry.
The TI TPA3116/3118 have undervoltage protection built in, as far as that goes.
2. That really depends on the behavior of the power supply, the specific Class D implementation/IC, and the supporting circuitry.
The TI TPA3116/3118 have undervoltage protection built in, as far as that goes.
I am attempting to repair a plate amp that uses a class d amp (using mosfet output transistors) and is powered by a switching power supply. i was just wondering if once I get everything I find bad replacing if I could/should slowly bring it up with a variac in hopes if i miss something that all my work doesn't go up in smoke.
Usually the control circuit will lock out operation if under voltage. The service manual should discuss this.
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The manufacturer will not provide the schematic nor parts list much less a manual, which is why I am inquiring about whether I can use this added precaution. Chances are given the lack of manufacturer support documents that my repair attempted won't be successful but nothing ventured nothing gained. FYI, stay away from Yung International products...you'll be on your own.
If you are using a switching power supply you won't be able to slowly bring the power supply voltage up. The supply is probably rated for an input range of 85-265 volts. That means when your variac hits 85 volts the power supply will put out the full rated voltage. Below 85 volts it may not output anything.
On the other hand, a linear supply could be used to slowly bring the voltage up.
On the other hand, a linear supply could be used to slowly bring the voltage up.
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