A maximum of 38V is listed in the datasheet and 50V as stress test value. Keep in mind that supply voltage will fluctuate under load, so local spikes might be even higher than your supply of 39V, depending on how your supply is made. Also keep in mind your primary +/-10-15% variation and the influence on output voltage.
Oh, +15% can actually mean 45 volts on secondary in the worst case scenario.
Adding a regulator circuit should be necessary, right?
Adding a regulator circuit should be necessary, right?
Matt, is it that the LME49720 OP amp is picking up noise from the surroundings? I read on another board that the TO99 package provides a bit of shielding also.
I'd say any noise is conducted rather than radiated since it's located pretty far away on the other side of the board from switching components.
Until now there is no evidence that the spikes you saw on the scope cause any audible harm. And there is a good chance they to not at all. So, what is the problem?
That's how these amplifiers clip and the noise the result of the ultrasonic switching that the fundamental operation of the amplifier is based on. The inductors in TIs evm are oversized, if memory serves, and TI have gone to great lengths to ensure the correct functioning of the chip.
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