Here is my modification. Any suggestion? The original one from Manojtm , can not run at high power rail . When connect +-80VDC and turn on the amp the power level is raise up to +-145VDC .That is not normal. So I have change the resistor at the emmiter of 2N5401 form 1K to 4.7K. The power level is steady at +-80VDC now. But I can not adjust the fsw by adjust resistor . If I decrease 1K to any lower value, the power level is raise up again.
How to solve this problem?
How to solve this problem?
I have one IRS500 used with the same SMPS .There is not any problem like this. So I do not think SMPS is cuase of the problem.
i used bd243 and bd244 on irs4k5 without issues i used was +/-75vlts .
once i tried +/-90 vlts on irs 4k5 but it failed with 4ohm load (but it played loud for about 20 mins) and another channel without a load my outputs were irfp260n . i guess it was because of latching explained on ir design tip DT 99-7 also maybe my frequency 🙁 🙁 but the gate drivers were o.k they did not get damaged in all the amp failures.
once i tried +/-90 vlts on irs 4k5 but it failed with 4ohm load (but it played loud for about 20 mins) and another channel without a load my outputs were irfp260n . i guess it was because of latching explained on ir design tip DT 99-7 also maybe my frequency 🙁 🙁 but the gate drivers were o.k they did not get damaged in all the amp failures.
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Hi opor,
For High supply design, level shifter should be properly aligned.
for +/-75v OR +/-85V supply change Resistor to 10K
check SMPS voltage without load
do not connect AMP without SP protect
Regards
MANOJ
Hi Manojtm,
Thank you . I have change resistor as your suggestion, so It can run at high supply rail. Even I decrease resistor to 560R to increase fsw. But there is new problem .Lower resistor than 820R ,there is DC out from amp that make hum. May be need dc offset adjustment circuit?
Thank you . I have change resistor as your suggestion, so It can run at high supply rail. Even I decrease resistor to 560R to increase fsw. But there is new problem .Lower resistor than 820R ,there is DC out from amp that make hum. May be need dc offset adjustment circuit?
I am quite happy with its performance. No audible noise while IRS500 still has some noise. I can say your aud600 or aud900 give better sound. But I never run it for long period so I can not guarantee.
Hi opor,
Decreasing resistor will lower fsw.
filter use gaped ferrite OR T106-2 / T157-2 core
Regards
MANOJ
Hi Manojtm,
As per your schematic ,why do you mention that R*** for fsw adjustment? And lower value make higher fsw?
BR
Opor
As per your schematic ,why do you mention that R*** for fsw adjustment? And lower value make higher fsw?
BR
Opor
very true with protection board connected this amp will give you the best service and it will not have issues at all.
Hi opor,
sorry for the printing mistake,and FSW depends not a single resistor its depends inverter chip(7404/14,4069), capacitor (2x 1nf and 56pF),FB resistor,filter coil,MOSFET and Supply rail.
Regards
MANOJ
Hi opor,
You want high fsw @400KHz choose
AUD600 rev 1.1 with resistor 680R, 74HC04,IRFZ540,22uH(T157-2 or Coilcraft coil)supply rail +/-45V
Regards
MANOJ
You want high fsw @400KHz choose
AUD600 rev 1.1 with resistor 680R, 74HC04,IRFZ540,22uH(T157-2 or Coilcraft coil)supply rail +/-45V
Regards
MANOJ