Hi,
I got 250W Class D IRS2092 amplifier form Sure Electronic (Carbon copy of IRAUDAMP7S-200 reference design). I use the amp to drive two sub-woofers. But i found below issues when the amplifier is run.
1- Amp was generated very high heat when it runs several minute. This has happen though the volume level is zero and even without a load. I read a post in this forum site regarding heat issue and adjusted the 2 blue pots so that the value to be 265 ohm as mentioned in that post. it worked. but it still generate bit high heat if the amp is run around 1 hour. is this the behavior of this type of amp? If not, can you pls assist me to over come this issue adjusting to correct value for blue pots (I don't have a oscilloscope)?
2- When i turn the volume level up, the blue LEDs start to switch off and amp stop working. This happen when the volume level is almost half of level( out put voltage at this point around 15V). This happens some time on both channels or some time only one channel. amp start working again when turn the volume down. Pls let me know the reason for this too. My power supply is AC 44V, 700VA and sub-woofer impedance is 6 ohm. (Amp got blow one time after happened several time on off the blue LEDs). Pls can you help me to avoid this issue since i'm waiting to put more volume to hear deep base from sub-woofers?
I got 250W Class D IRS2092 amplifier form Sure Electronic (Carbon copy of IRAUDAMP7S-200 reference design). I use the amp to drive two sub-woofers. But i found below issues when the amplifier is run.
1- Amp was generated very high heat when it runs several minute. This has happen though the volume level is zero and even without a load. I read a post in this forum site regarding heat issue and adjusted the 2 blue pots so that the value to be 265 ohm as mentioned in that post. it worked. but it still generate bit high heat if the amp is run around 1 hour. is this the behavior of this type of amp? If not, can you pls assist me to over come this issue adjusting to correct value for blue pots (I don't have a oscilloscope)?
2- When i turn the volume level up, the blue LEDs start to switch off and amp stop working. This happen when the volume level is almost half of level( out put voltage at this point around 15V). This happens some time on both channels or some time only one channel. amp start working again when turn the volume down. Pls let me know the reason for this too. My power supply is AC 44V, 700VA and sub-woofer impedance is 6 ohm. (Amp got blow one time after happened several time on off the blue LEDs). Pls can you help me to avoid this issue since i'm waiting to put more volume to hear deep base from sub-woofers?
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IRS2092 design can be a minefield.
Over heating of mosfets probably means frequency is too high or there is cross conduction.
Over heating of output filter inductor is probably wrong core material.
Resetting on high volume settings sounds like over current detector cutting in and resetting 2092. The over current setting resistors are possibly wrong.
I would be inclined to ask for my money back or a "working" replacement.
Over heating of mosfets probably means frequency is too high or there is cross conduction.
Over heating of output filter inductor is probably wrong core material.
Resetting on high volume settings sounds like over current detector cutting in and resetting 2092. The over current setting resistors are possibly wrong.
I would be inclined to ask for my money back or a "working" replacement.
Hi,
Yes, Over Heating issue due inaccurate frequency. I need to set self oscillation Frequency to it's optimum value. But the issue is i don't have a oscilloscope to adjust this. So i need your help to get accurate value of the resistor that the adjustable resistors s/be kept it's optimum frequency.
I also think the over current protection may be activate when increasing the volume level. But i can't realize why the protection get active during such a low volume level. According to International Rectifier data sheet, IRFI 4020 doesn't support below 8ohm. Is this due to speaker impedance? I checked the resistors which related to over current sensing. But values of those are correct.
You should really be using an 8 ohm speaker with those mosfets.
6 ohms is too low, could explain why the 2092 is resetting.
6 ohms is too low, could explain why the 2092 is resetting.
I also think speaker impedance could be the issue. But i have read some other forum sites and some people mentioned there that they drive 4 ohm speakers with the same type amp. Do you think it will help to over come the issue to some extend if i increase the resistor values of over current protection slightly?
You are already trying to get 340WRMS out of a 250WRMS pcb.
If you start messing over current resistors you are going end up blowing mosfets.
See if it works with the right power supply and 8 ohms.
If it doesn't ask for your money back and buy a better amplifier.
If you start messing over current resistors you are going end up blowing mosfets.
See if it works with the right power supply and 8 ohms.
If it doesn't ask for your money back and buy a better amplifier.
Hi,
Yes. Trying to change the original values of resistors may be caused to result unexpected malfunctions or blown the amp. I will check the amp with 8 ohm system and see the result.
Hi,
I have another issue with the Class D amp and Radio. My radio get too noisy and unclear when i switch my class D amp on. Radio back to work when switch the class D amp off. Can you any one help me to rectify this issue?
I have another issue with the Class D amp and Radio. My radio get too noisy and unclear when i switch my class D amp on. Radio back to work when switch the class D amp off. Can you any one help me to rectify this issue?
Put your amplifier in a shielded case that is earthed.
Make sure output filter is close to output of amplifier.
If the output filter components aren't correct you can get significant carrier on the output which will cause interference.
Make sure output filter is close to output of amplifier.
If the output filter components aren't correct you can get significant carrier on the output which will cause interference.
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