# What is "Power Supply Pumping"?

I recently came across the term "Power Supply Pumping" in an answer provided to me in return to one of my questions. Although I tried googling I didn't have good luck with it. I would appreciate if someone can explain how I could utilize this concept to drive multiple high impedance amplifier inputs efficiently (about 10, 9 KOhm each) by an MP3 player output.

• Wikipedia article on Class-D Amplifier en.wikipedia.org/wiki/Class-D_amplifier section on "Design challenges", "Power supply design" talks about this issue. I've never seen it referred to as "power supply pumping", that seems like an inexact term... the actual problem is that driving a reactive load (like an inductive speaker coil, or the audio low-pass filter) can cause energy to be fed back into the power supply. Mar 7, 2015 at 9:44