Class-D Detex IRS-1500D - No & Low Level input Problem

Hi guys..this is my IRS1K5 , it has problem with lower level signal input (or no input signal - volume=0) . as you can see with low level signal input (like low volume) the amp doesn't start to oscillate and that blue led shows this. i want to show this problem to others specially in DIYAUDIO and ask us for help.

more info :


http://www.diyaudio.com/forums/class-...
http://www.diyaudio.com/forums/class-...

Thanks For Watching :)

• Category

  Science & Technology

[adonis pitos]

Hi hexfet247,what is your working voltage?dc bias current e.g.(12VDC) so that we can calculate your RSS,value of inductor your using,comparator IC TL071 work's between 15ma to 20ma current supply,this amp. work well give some details of your amp and maybe i can help you.

[HEXFET247]

Hi adonis ,

sorry for delay...

my amp running with +/- 55~60v

value of inductor is 46~48 uH

dc bias current ? i'm using lab psu set to 12v and current consumption during the operation is 0.07A

you built this amp ? don't have same problem ?

thanks for help

[adonis pitos]

Hi HEXFET247,i build the IRS200 i got the same problem,using -/+ 90VDC with external 12 vdc bias,what i done,i change the resistor parallel to the output which is 1k to 470 ohm's RSS i prefer to use 8.2k to give a minimal current to the comparator (TL071) and that's it,i think one reason on this design doesn't oscillate immediately is when you put a lot of current to the op-amp.this is base on my experience on this type of class D-amp,hope to hear from you.

[HEXFET247]

Thanks adonis. i didn't think about that paralleled resistor before. in my irs1500 it's 1K5. also i'm using 4K7 for RSS. I'm going to test what you said and tell you the result. more info on my problem can be find in two new links which i add to video description.

Thanks for Help

[Mert Şenay]

high side mosfet driver POWER diode MUR120-460 Problem :)

[TheBinray]

you dont have enough gain in your feedback loop what type of loop are you using ?

[Luiz C. Pimenta]

Também tive esse problema...