Hello,
We are going to do an SMPS for a Class D audio guitar amplifier.
The Power level that we wish to choose, is that power level which is the maximum possible power level that can be done with a cheap flyback.
So do you know what that power level is?
The Class D amplifier will be of the half-bridge variety.
Vin = 90-265VAC.
We are going to do an SMPS for a Class D audio guitar amplifier.
The Power level that we wish to choose, is that power level which is the maximum possible power level that can be done with a cheap flyback.
So do you know what that power level is?
The Class D amplifier will be of the half-bridge variety.
Vin = 90-265VAC.
I've seen a NCP1651 based, single-stage PFC/flyback do 54V at 10A from a 85-264V input. Transformer was huge, output had horrible 120Hz ripple on it... but it was a battery charger so it didn't matter.
No reason you can't do the same, just make sure the class D section provides plenty of power supply rejection at 100/120Hz.
No reason you can't do the same, just make sure the class D section provides plenty of power supply rejection at 100/120Hz.
If you want cheap and higher power, you can't beat what's in a lot of LCD TVs nowadays.
Generic PFC stage, producing a "regulated" 400V, followed by an unregulated half-bridge forward converter running at maximum duty cycle. No output inductors, and the only feedback is overvoltage protection.
Generic PFC stage, producing a "regulated" 400V, followed by an unregulated half-bridge forward converter running at maximum duty cycle. No output inductors, and the only feedback is overvoltage protection.
sorry Sawyer, but ti.com disagree with you.heres a 150 Watt flyback.......
http://www.ti.com/lit/ml/slup078/slup078.pdf
http://www.ti.com/lit/ml/slup078/slup078.pdf
Why are you so insistent on proving people wrong? He said "not typically used above 100W or so" instead of "it's impossible", and besides it's been 3 months since anyone posted in the thread.
I'm pretty sure you could build a flyback capable of 100KW if you really wanted to. It'd be the most impractical power supply on the planet, completely pointless to build, but I wouldn't call it impossible.
Ja ja ja, a big mutually coupled inductor, a very big MOSFET array, a very big MOSFET driver, a ton of aluminium heat sink, and finally, a big PCB!!!
A 100W flyback with conventional magnetics and good coupling requires ETD29, otherwise it's ok (>=150W will require >=ETD39). The advantage over forward converter is lower part count.
PI TOPSWITCH ICs (and others) allow to make 100W-200W flybacks with low part count without compromises in protection or regulation, but be careful with pulse skip modes at low power because they can make poor class D circuits sing
PI TOPSWITCH ICs (and others) allow to make 100W-200W flybacks with low part count without compromises in protection or regulation, but be careful with pulse skip modes at low power because they can make poor class D circuits sing
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