pulse current survivability of small BJTs - Page 2

AndrewT · 12th October 2006, 08:42 AM

Hi,
the first datasheet I pulled out was a Zetex zdt1048. 8DIL

I am sure there are many others from Zetex (who seem to specialise in high current small devices) and different manufacturers.

They talk about 150MHz & 60pF.
Ic <=5A & 20Apk.
2W @ DC & 200Wpk @ 100uS
Vce(sat) @1A ~=60mV @ 100degC
switching low 100s nS

zilog · 12th October 2006, 09:02 AM

Quote:

Originally posted by peranders
You haven't thought of using a mosfet driver?

I dont want to use mosfet drivers since I dont need fast rise times, only fast turn-off. Besides, driver ICs have no place in a fully discrete UcD.

For the discussion on RS/Farnell, these dont sell to DIY:ers. I am a consultant but I unfortunately have no company to place the order from :/

djQUAN · 12th October 2006, 09:23 AM

I have driven seven IRFZ44 mosfets with 22 ohm gate resistors with a totem pole using 2N3904/2N3906 at 56kHz for a car SMPS (14 in all). so far, they have survived. not sure if they would be fine in the long run though.

the transistors do feel a little warm but not burning hot during operation.

AndrewT · 12th October 2006, 09:28 AM

Hi Zilog,
both RS and Farnell supply to me as a private buyer.

I just registered online.

I still prefer Rapid & Dalbani.

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12th October 2006, 08:42 AM	#11
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, the first datasheet I pulled out was a Zetex zdt1048. 8DIL I am sure there are many others from Zetex (who seem to specialise in high current small devices) and different manufacturers. They talk about 150MHz & 60pF. Ic <=5A & 20Apk. 2W @ DC & 200Wpk @ 100uS Vce(sat) @1A ~=60mV @ 100degC switching low 100s nS

12th October 2006, 09:23 AM	#13
djQUAN diyAudio Member Join Date: May 2004 Location: manila	I have driven seven IRFZ44 mosfets with 22 ohm gate resistors with a totem pole using 2N3904/2N3906 at 56kHz for a car SMPS (14 in all). so far, they have survived. not sure if they would be fine in the long run though. the transistors do feel a little warm but not burning hot during operation.

12th October 2006, 09:28 AM	#14
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi Zilog, both RS and Farnell supply to me as a private buyer. I just registered online. I still prefer Rapid & Dalbani.