Hi there,
I desoldered these parts from a MEGA SMPS BOARD.
IRF1405 - 55V 330W Power Dissip
IRF840A
32CTQ030 30A 25-30V SCHOTTKY RECTIFIER
42CTQ030 40A 30V SCHOTTKY RECTIFIER
40L15CT 40A 15V SCHOTTKY RECTIFIER
R860P2 - single diode for flyback use
STPS40H100CW 40A 100V High voltage SCHOTTKY RECTIFIER
IRFP450A
2x etd39/20/13
-----------
Firstly I need to know what is the maximum Power for these etd39/20/13 trafos. I searched internet with no luck and results.
They look like big enough for 1kw each ? Is ETD49 more powerful ?
My plan is to make 2x1kW stereo class D amplifier. Or 2x500W in the bad case.
The amplifier will be single supply and i will be able to use voltage regulation.
Is these calculations right ?:
a * 8 ohm = v
a*a = 1000W/8ohm
a= 11A
v= 11*8 = 88Vrms == 124.43 Vpeak == 249 Vpp (supply voltage for the class D amp) for 1000Wrms power.
Or for 1000Wpeak -> 88*2 = 176V supply
Or average between rms and peak 249+88*2/2 == 213Vpp
-----------
Which one from these inductors to use for the amplifier output inductor ?
And which one for the supply filtering ?
--
What is better two pairs of IRF840 or one pair IRFP450 ?
--------
I know its not good to use big capacitors for filtering because they short circuits the smps.
How to calculate what is the maximum capacitance I can use to not short circuit the board ?
I desoldered these parts from a MEGA SMPS BOARD.
IRF1405 - 55V 330W Power Dissip
IRF840A
32CTQ030 30A 25-30V SCHOTTKY RECTIFIER
42CTQ030 40A 30V SCHOTTKY RECTIFIER
40L15CT 40A 15V SCHOTTKY RECTIFIER
R860P2 - single diode for flyback use
STPS40H100CW 40A 100V High voltage SCHOTTKY RECTIFIER
IRFP450A
2x etd39/20/13
-----------
Firstly I need to know what is the maximum Power for these etd39/20/13 trafos. I searched internet with no luck and results.
They look like big enough for 1kw each ? Is ETD49 more powerful ?
My plan is to make 2x1kW stereo class D amplifier. Or 2x500W in the bad case.
The amplifier will be single supply and i will be able to use voltage regulation.
Is these calculations right ?:
a * 8 ohm = v
a*a = 1000W/8ohm
a= 11A
v= 11*8 = 88Vrms == 124.43 Vpeak == 249 Vpp (supply voltage for the class D amp) for 1000Wrms power.
Or for 1000Wpeak -> 88*2 = 176V supply
Or average between rms and peak 249+88*2/2 == 213Vpp
-----------
Which one from these inductors to use for the amplifier output inductor ?
And which one for the supply filtering ?
--
What is better two pairs of IRF840 or one pair IRFP450 ?
--------
I know its not good to use big capacitors for filtering because they short circuits the smps.
How to calculate what is the maximum capacitance I can use to not short circuit the board ?