开云体育

Hi Jerry,

Right.? The choke is in series with the converter module input.? The cap is after the choke connected input to ground of the converter.? I made the swap to 10uF but I don't see a significant change?.? Curious: Why the reduction in capacitance?? It seems to me that reducing the frequency range of the DC bus (via 1000uF cap) develops a better condition for the buck regulator to operate.? If I understand these buck converters right, the choke of the converter is charged and then discharged into the output when the charger FET is turned off.? The result is a pulsing DC? ?

To be clear, the waveforms I've been sending are of the converter output, zoomed into the the ripple only of the 5.3xx vdc output.? In general, the frequency of the ripple is above 200KHz with a p-p magnitude of about 50mV.? That's about 1% DC regulation at a pretty high frequency.? It seems to me that if the noise is above the audible range that the audio amplifier(s) may boost it but it will never get heard.? Or is it a desired condition to drive the noise frequency to a specific range?

I'm a long time UPS guy.? I have good knowledge of rectifiers, inverters, solid state switch schemes and battery technology but DC use in an audio to RF environment is still new to me.??
I do appreciate your thoughts.

Thanks again, Scott


? ?