M50D060S Datasheet??? - Page 2

Inch-o · 4th August 2009, 10:55 AM

Ah...

And I did ordered the IGBTs from Farnell. I used the FGH50N6S2D...
As well replaced the cap at the input of the small psu(4.7uF/450V), put the protection diodes in place(BYV26+P6KE170A), replaced the two 22ohm/10W resistors...

JonathonReinhart · 16th October 2009, 01:39 AM

Hey everyone. I'm working on a PMP3000. Here's the schematic of the power supply that I've put together so far: http://jonathon.onthefive.com/temp/pmp3000psu.png

Upon firing it up after replacing a broken fuse holder, I smoked one of the large ceramic resistors at the input (R12). As it was red hot, I assumed there was a short somewhere. Measuring across (+) and (-) at the output of the rectifier, sure enough there was a short (~0 Ohms). I confirmed that IGBTs T3 and T4 are both appear to be shorted from Collector to Emitter.

Is this the same mode of failure you saw in your mixer? How does the small PSU work? And also, can you give more details of the protection diodes? It seems like that would be a good idea to prevent transients from damaging the IGBTs.

My band has practically no money, so fixing this mixer for practically nothing would be fantastic :-)

Thanks a lot,
Jonathon Reinhart

JonathonReinhart · 16th October 2009, 03:06 PM

Also, It looks like all of these IGBTs that we've been considering for replacement have built-in reverse-protection diodes. Are these sufficient?

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4th August 2009, 10:55 AM	#11
Inch-o diyAudio Member Join Date: Aug 2008	Ah... And I did ordered the IGBTs from Farnell. I used the FGH50N6S2D... As well replaced the cap at the input of the small psu(4.7uF/450V), put the protection diodes in place(BYV26+P6KE170A), replaced the two 22ohm/10W resistors...

16th October 2009, 01:39 AM	#12
JonathonReinhart diyAudio Member Join Date: Oct 2009	Hey everyone. I'm working on a PMP3000. Here's the schematic of the power supply that I've put together so far: http://jonathon.onthefive.com/temp/pmp3000psu.png Upon firing it up after replacing a broken fuse holder, I smoked one of the large ceramic resistors at the input (R12). As it was red hot, I assumed there was a short somewhere. Measuring across (+) and (-) at the output of the rectifier, sure enough there was a short (~0 Ohms). I confirmed that IGBTs T3 and T4 are both appear to be shorted from Collector to Emitter. Is this the same mode of failure you saw in your mixer? How does the small PSU work? And also, can you give more details of the protection diodes? It seems like that would be a good idea to prevent transients from damaging the IGBTs. My band has practically no money, so fixing this mixer for practically nothing would be fantastic :-) Thanks a lot, Jonathon Reinhart

16th October 2009, 03:06 PM	#13
JonathonReinhart diyAudio Member Join Date: Oct 2009	Also, It looks like all of these IGBTs that we've been considering for replacement have built-in reverse-protection diodes. Are these sufficient?

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