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switching power supply fault? irf's...
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Old 1st June 2010, 07:13 PM   #1
xeclipse is offline xeclipse  Kenya
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Join Date: May 2010
Location: Where the world's best tea come from:Kericho Kenya
Default switching power supply fault? irf's...

Hi guys,
am new to switching power supply.I visited several guys repairing car amps,all the amps had burnt out irfz34n's.
What's the main cause of this?I would like to build one myself,but i would not like to own a pcb of smoking irfs!
if there are no sparks,it probably doesn't work!
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Old 1st June 2010, 07:16 PM   #2
luka is offline luka  Slovenia
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switching power supply fault? irf's...
they are dead most likely because of short somewhere
home page @ http://www.classdaudio.tk/ @ 24/7 all year long
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Old 1st June 2010, 07:19 PM   #3
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
The power supply FETs typically fail because the amp is improperly connected (speakers or power) or improperly fused. It's virtually impossible to eliminate the possibility that the FETs will fail but if you use proper fusing and a good overall design, your power supply shouldn't fail.

If you're really new to switching supplies, visit the following page. it's not complete but it covers a lot of the basics. Let me know if you find something that needs to be explained in more detail.

Basic Switching Power Supply Design Tutorial
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