About this amp, I wanted to make you a question.
I'm building a IRAUDAMP9 amplifier, using irs2092 and 6 x irfb4227.
The only thing I have to say is that I'm making only the amplifier and the feedback network with two resistors 1k and 120k and the capacitor 150pF, without regulators and protectors.
Tensions +/- 5v and 12v I get them from other external power supplies that start as soon as I turn on the bus voltages.
The gate driver (ZXTN25100BFH ZXTP25100BFH +) have been replaced with d44vh10 + d45vh10.
There is a very strange problem.
At power in the speaker you hear a click that is repeated endlessly, but the amplifier does not start and therefore not sound.
The bus voltage is set at +/- 77v and 5v +/- dual voltages are obtained from the bus voltage by using two 3.9k resistors and two 5.6V Zener diodes, while the 12vdc voltage is obtained from a secondary winding on the transformer power that provides the bus voltages referred to ground with -B.
All voltages are present and correct. but there is no way to operate the amplifier.
In my stock I have 3 irs2092 normal and 4 irs2092 in smd version, I tried them all, and the problem persists.
The mosfets are all new and working, purchased from TME website.
what do you think?
I'm building a IRAUDAMP9 amplifier, using irs2092 and 6 x irfb4227.
The only thing I have to say is that I'm making only the amplifier and the feedback network with two resistors 1k and 120k and the capacitor 150pF, without regulators and protectors.
Tensions +/- 5v and 12v I get them from other external power supplies that start as soon as I turn on the bus voltages.
The gate driver (ZXTN25100BFH ZXTP25100BFH +) have been replaced with d44vh10 + d45vh10.
There is a very strange problem.
At power in the speaker you hear a click that is repeated endlessly, but the amplifier does not start and therefore not sound.
The bus voltage is set at +/- 77v and 5v +/- dual voltages are obtained from the bus voltage by using two 3.9k resistors and two 5.6V Zener diodes, while the 12vdc voltage is obtained from a secondary winding on the transformer power that provides the bus voltages referred to ground with -B.
All voltages are present and correct. but there is no way to operate the amplifier.
In my stock I have 3 irs2092 normal and 4 irs2092 in smd version, I tried them all, and the problem persists.
The mosfets are all new and working, purchased from TME website.
what do you think?
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What is your base frequency? What is the average DC offset at the junction of your power fets? What does the drive waveform look like?
hi jonsnell electronic.
My switching frequency is 300khz, as it says on the datasheet, but
unfortunately I do not have an oscilloscope, for this reason, I can not verify the actual switching frequency.
But surely I can see what my dc offset at the output. USING MY METER, how should I set the positive and negative probe?
the positive probe, definitely on the output, while the negative where I put it?
Have you made a PCB for this amp, or are you trying to run it wired on a breadboard? What you are describing sounds like the IRS2092 is trying to start but then immediately senses a fault condition, so it is going into a hiccup cycle which is causing the repetitive clicks. Are you sure that what you built is identical to the IRSAUDAMP9 schematic, minus the external protection and regulators? Have you checked that all of your power supplies are coming up in the sequence shown in the app note?
Hi ungie, I've realized a pcb using Fidocad software and press'n'pell method to transfer the circuit to the board. All identical to iraudamp9 circuit with feedback and without the regulators and protections.
I don't know if the boot sequence is identical to iraudamp9 original design but I don't think because in the original design the regulators generate vaa, vss and vcc (vcc voltage have the negative refferred to - vbus) in sync.
In my design this voltages are generate by external three secondary windings that produce the voltages at v-bus power on.
Honestly i don't think that this can be a problem....
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