Class D BandWith DC to 10KHz

[mederic]

hello
I try to realize an amplifier with a bandwidth of 0Hz(DC) to 10Khz

I am using the IRAUDAMP7D (irs2092)

I simply remove DCP (dcprotect) and DC Block input capacitor

my amp goes into over current protec below 4Hz


Is anyone could help me to understand is mystery?


(I work in research and the amp is designed to control coils)

 

[darkfenriz]

Rail pumping:
The amplifier starts to act as a boost converter pumping the energy from one rail into another so that the differential voltage at rails increases up to mosfet's avalanche.

 

[ssanmor]

The best solution for playing very low frequencies and high power is to use two amplifiers in bridge mode (fed by the same PSU), this way bus pumping from one channel automatically compensates the opposite pumping from the other.
Otherwise with half-bridge designs you will have to use extremely large supply capacitors and you may gain little improvement.

 

[mederic]

thank you for your reply
it looks working well in bridge mode