Magnum md250.4 irs2092

[ray9043]

Hi everyone. Im working on a 4 channel class d amp with irs2092 ic and irfb4227 oitpit mosfets.
The 5v regulators has failed, so all 4 ics fail. Im waiting for the irs2092, now i have only one channel working.

The problem is it had 2 diodes shorted on 2 left channels, and i dont know the value. In the picture the diode is the d6. Its conected to csh pin with a 6.8k ohm resistor.

Irs2092 datasheet says use bav19ws diode, others diagrams use mur120.

Anyone have info about this diode?

Thanks

 

[Perry Babin]

I was hoping that someone else would know definitively.

The diode needs to be able to withstand at least full rail to rail voltage.

I'd use something rated for 200ma or more (it will never likely need more).

It needs to be a fast recovery diode (25-35ns Trr).

 

[ray9043]

Ok. Im testing wit bav99 diode. Replace the others 3 irs2092, 2 channel with the original diode, 2 with the bav99.
3 channels working now. One with the bav99 has 4-5 volts at output, with and without mosfets in place. Only a pulse when i hook up the speaker. Replace the irs2092 with another same result. Double checked all resistors and diode. Tomorrow i will check voltages between a working channel and this not working channel

 

[ray9043]

No luck with this amp. The bad channel has the same voltages like the others, now i have 2 output mosfets blown and only 1 irs2092 live. I need to buy more irs to test it.