Yes Sir, Mr. Thimios, at your service😉.
Would you rather prefer the rectifier in GBPC package or SIP package like Vishay PB3510 package? 🙂
reg
Prasi
Dear All,
Merry Xmas all !I received the PCBs from X. I have all the parts except the IRFP240. In India, we have available the following Mosfets. Can you recommend any one of them for use in this amp ?
Infineon - IRF2807 75V 82A 13mOhm MOSFET
Infineon - IRF3205 55V 98A 8mOhm 97.3nC MOSFET
Infineon - IRF3710 100V 57A 23mOhm 86.7nC MOSFET
Vishay - IRF530 N-Chan 100V 14 Amp MOSFET
Vishay - IRF540 N-Chan 100V 28 Amp MOSFET
Vishay - IRFP150 N-Chan 100V 41 Amp MOSFET
Vishay - IRFP250 N-Chan 200V 30 Amp MOSFET
Vishay - IRFP260 N-Chan 200V 46 Amp MOSFET
--gannaji.
Merry Xmas all !I received the PCBs from X. I have all the parts except the IRFP240. In India, we have available the following Mosfets. Can you recommend any one of them for use in this amp ?
Infineon - IRF2807 75V 82A 13mOhm MOSFET
Infineon - IRF3205 55V 98A 8mOhm 97.3nC MOSFET
Infineon - IRF3710 100V 57A 23mOhm 86.7nC MOSFET
Vishay - IRF530 N-Chan 100V 14 Amp MOSFET
Vishay - IRF540 N-Chan 100V 28 Amp MOSFET
Vishay - IRFP150 N-Chan 100V 41 Amp MOSFET
Vishay - IRFP250 N-Chan 200V 30 Amp MOSFET
Vishay - IRFP260 N-Chan 200V 46 Amp MOSFET
--gannaji.
Great to hear that the boards finally made it to India! 🙂
I think IRFP250 should work fine - just next generation of IRFP240. Good luck on the build!
Cheers,
X
IRFP 240 vs 250
Vishay - IRF530 N-Chan 100V 14 Amp MOSFET
Vishay - IRF540 N-Chan 100V 28 Amp MOSFET
Vishay - IRFP150 N-Chan 100V 41 Amp MOSFET
Vishay - IRFP250 N-Chan 200V 30 Amp MOSFET
Vishay - IRFP260 N-Chan 200V 46 Amp MOSFET
Mosfet Ciss Coss Crss in pf @Vgs = 0, Vds = 25, F = 1 MHz
IRFP240 1300 400 130
IRFP250 2800 780 250
IRFP260 5200 1200 310
IRFP150 2800 1100 280
IRF530 670 250 60
IRF540 1700 560 120
So, which one is suitable ? 😕
--gannaji
Vishay - IRF530 N-Chan 100V 14 Amp MOSFET
Vishay - IRF540 N-Chan 100V 28 Amp MOSFET
Vishay - IRFP150 N-Chan 100V 41 Amp MOSFET
Vishay - IRFP250 N-Chan 200V 30 Amp MOSFET
Vishay - IRFP260 N-Chan 200V 46 Amp MOSFET
Mosfet Ciss Coss Crss in pf @Vgs = 0, Vds = 25, F = 1 MHz
IRFP240 1300 400 130
IRFP250 2800 780 250
IRFP260 5200 1200 310
IRFP150 2800 1100 280
IRF530 670 250 60
IRF540 1700 560 120
So, which one is suitable ? 😕
--gannaji
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Hi All,
My 2 cents 😉
IRF530 (as well as IRF540) has got smaller die and smaller package (TO-220). As a result - roughly 2 times lower capacitances and half the power rating. Also note the voltage - it's only 100V maximum.
So, talking about the equivalent replacement for IRFP240, I would consider 2 x IRF530 in parallel (with separate gate stoppers and source resistors for proper current sharing), assuming your rails don't exceed some +/-48V (each output transistor sees almost rail-to-rail at high swing).
IRFP250 and IRFP260 are not just the "next generation" - they have got bigger dies, roughly 1.5x times bigger for IRFP250 and 2x bigger for IRFP260 (same, as the power rating). However, the capacitances grow at higher scale, appearing 2x for IRFP250 and 4x for IRFP260. So... these guys are powerful, but may require the driver stage redesign (higher charging current capability) and possibly compensation amendments.
The whole IR HexFET product line analysis is showing that IRFP240 is somewhat ... unique in terms of linear audio applications due to the following combination of reasons:
- It's got a complementary IRFP9240;
- It's got a relatively high power rating (150W) and good voltage rating (200V);
- It's got relatively low capacitances for this power rating (still requiring proper driver stage);
- It's inexpensive, making the whole amp economically efficient, especially if multiple output pairs are used.
Cheers,
Valery
My 2 cents 😉
IRF530 (as well as IRF540) has got smaller die and smaller package (TO-220). As a result - roughly 2 times lower capacitances and half the power rating. Also note the voltage - it's only 100V maximum.
So, talking about the equivalent replacement for IRFP240, I would consider 2 x IRF530 in parallel (with separate gate stoppers and source resistors for proper current sharing), assuming your rails don't exceed some +/-48V (each output transistor sees almost rail-to-rail at high swing).
IRFP250 and IRFP260 are not just the "next generation" - they have got bigger dies, roughly 1.5x times bigger for IRFP250 and 2x bigger for IRFP260 (same, as the power rating). However, the capacitances grow at higher scale, appearing 2x for IRFP250 and 4x for IRFP260. So... these guys are powerful, but may require the driver stage redesign (higher charging current capability) and possibly compensation amendments.
The whole IR HexFET product line analysis is showing that IRFP240 is somewhat ... unique in terms of linear audio applications due to the following combination of reasons:
- It's got a complementary IRFP9240;
- It's got a relatively high power rating (150W) and good voltage rating (200V);
- It's got relatively low capacitances for this power rating (still requiring proper driver stage);
- It's inexpensive, making the whole amp economically efficient, especially if multiple output pairs are used.
Cheers,
Valery
You should be able to get IRFP240. Look around. I've never seen it disappear so far ! Chennai has it and so do Bangalore shops. Someone in Hyderabad should have it. You can use the IRFP250 for sure . You should have enough current driving the Crss of the IRFP250 MOSFET. However not by a very large margin.
You can always increase the driver stage bias to have additional current if required. Only need to change a few resistors.
So just get the IRFP250 and finish the assembly. Test it out and see if all's well. If everything sounds fine ( at high volume !) then leave things as they are !
someone indeed does have IRFP240 Hyderabad, https://www.eightaudio.in/collections/transistors-fets/products/irfp240-20a-200v-n-channel-mosfet
reg
Prasi
reg
Prasi
I use the TO-220 IRFxxx series on another project that has the main rails fixed at +-25V; however, I wouldn't recommend a TO-220 output for any amp rated for > 45W.
You didn't say what voltage rails you are running but assuming +-40-45V then the IRFP150 is sailing a little too close to the wind with Vds = 100V. I'd probably settle for the IRFP250 in your situation... try it and let us know how it performs 😉
Thank you Prasi for ref to Eight Audio in Hyderabad itself. Placing the order for 240.
A lot of good advice from other members which is a good learning experience in choosing critical parts. Thanks to M/s Ranchu, Ashok, Valeri, X and Dacz.
A lot of good advice from other members which is a good learning experience in choosing critical parts. Thanks to M/s Ranchu, Ashok, Valeri, X and Dacz.
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