Hello all,
I a brand new to class D design. I pulled a schematic of the web and I am trying to duplicate it and make a working breadboard circuit. I have no test equipment to analyze the circuit I have been using multisim to simulate the circuit but it keeps erroring out. I must be designing wrong. Can anyone identify some issues with my circuit design. I will attach.
I a brand new to class D design. I pulled a schematic of the web and I am trying to duplicate it and make a working breadboard circuit. I have no test equipment to analyze the circuit I have been using multisim to simulate the circuit but it keeps erroring out. I must be designing wrong. Can anyone identify some issues with my circuit design. I will attach.
Attachments
It looks like the circuitry has been published in order to fool people.
- Single 60V power rail, but not a bridged design nor speaker series cap.
Global feedback connected to the low impedance output of the input buffer ==> R7 Almost meaningless.
- Triangle generator questionable: Inverting and non inverting inputs of two comparators tied together, but not connected to any meaning full signal. Poor reproduceability likely, or simply locks.
- C9 connected to a 36V supply instead to GND? Trouble, except V9 has low noise and low AC-impedance (which is given in SIM, but reality can become tricky).
- Gate resistors, as already mentioned by voltwide
- U6: Common is floating
Most likely there are more points, but already from above I am judging it as a bad joke.
You should definitely look for a proven design ( Schematic&PCB !) of which other DIYers confirm that they have build it with success.
- Single 60V power rail, but not a bridged design nor speaker series cap.
Global feedback connected to the low impedance output of the input buffer ==> R7 Almost meaningless.
- Triangle generator questionable: Inverting and non inverting inputs of two comparators tied together, but not connected to any meaning full signal. Poor reproduceability likely, or simply locks.
- C9 connected to a 36V supply instead to GND? Trouble, except V9 has low noise and low AC-impedance (which is given in SIM, but reality can become tricky).
- Gate resistors, as already mentioned by voltwide
- U6: Common is floating
Most likely there are more points, but already from above I am judging it as a bad joke.
You should definitely look for a proven design ( Schematic&PCB !) of which other DIYers confirm that they have build it with success.
I would forget a discrete version and go for something like an IRS2092 version.
You can adjust deadtime and over current detect.
It will also directly drive 4019 mosfets.
I would advise finding a ready made layout as layout and correct and close decoupling is vital for a working pcb.
IRAUDAMP series is worth looking up, there are various different ones with different powers.
It took me a couple of revisions of my own pcb design before I got a 2092 working properly. So a ready made pcb would be ideal.
You can adjust deadtime and over current detect.
It will also directly drive 4019 mosfets.
I would advise finding a ready made layout as layout and correct and close decoupling is vital for a working pcb.
IRAUDAMP series is worth looking up, there are various different ones with different powers.
It took me a couple of revisions of my own pcb design before I got a 2092 working properly. So a ready made pcb would be ideal.
I would suggest buying readily built IRAUD referemce designs cloned by sure electronics. A 2x125W Modul costs about U$35 and can easily be modified to 2x250W. And these modules do work.
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