IRS2092 DT pin

[steppler]

Hello, I have Class D amp with IRS2092 from China. There is a pin9 (DeadTime) connected to pin10 (-B). Is it normal? I haven't seen it anywhere.

 

[nigelwright7557]

I have done the same on my 2092 circuit.
That's the setting for max dead time.

 

[steppler]

The amplifier is generally weird. It's 2 x (IRS2092+2xIRFP4227) bridge mode. Input circuit is like a radio jammer. It's Aliexpress IRAUD2000. The sound is good but the terrible interference !!! When I disconnect input signal cable interference is gone. But cable is OK. It's awful.

 

[nigelwright7557]

System needs a single earth in it.
Does input connect to zero volts too ?

 

[steppler]

Of course

 

[chchyong89]

try check if there is any ground loop when connected with source.

 

[steppler]

When I compare board and recommended schematic:

C1 missing
C2; C3 only 4u7 ceramic SMD
C4 missing
C8; C9 only 4u7 ceramic SMD

It's strange

 

[steppler]

My experience ....IRS2092 is a very problematic circuir, and I don't want anything to do with him.

 

[chchyong89]

i have made few tenth variants of class D from 200w to 1kw with irs2092s in the market and running fine until today. Just that you need to understand it.😱

 

[nigelwright7557]

My experience ....IRS2092 is a very problematic circuit, and I don't want anything to do with him.

Class D is fussy about layout and decoupling.
Also, gate driver and dead time takes a lot of care.

My early attempts at getting it working failed badly.

Even after I got it working with irf4227's on power down it would squeal then give an an almighty bang through the speakers !
IR said I had to much smoothing so answer was a reset circuit that monitored VCC and if out of spec held 2092 in reset.

 

[steppler]

Hello.

When I move the input signal connector and the amplifier has the voltage „on“. Sometimes a mosfet is destroyed.
Bridge mode output still cca 1,3 - 1,7V DC.