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Old 6th July 2012, 10:28 PM   #1591
Salas is offline Salas  Greece
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That is 126C. Too hot especially for the semi. Are you using a contact thermocouple to read the temp?
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Old 6th July 2012, 10:29 PM   #1592
mjock3 is offline mjock3  United States
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No infared.
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Old 6th July 2012, 10:32 PM   #1593
Salas is offline Salas  Greece
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In what room temp, CCS setting, load dummy? Are you aiming the black part of the semi's case from about 15cm (half foot) distance?
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Old 6th July 2012, 10:36 PM   #1594
mjock3 is offline mjock3  United States
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Room temp. is about 80. I have just shy of 1 amp that I am shooting for. I grabbed a thermocouple and am checking with that now. It is showing 188 F.
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Old 6th July 2012, 10:41 PM   #1595
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Thermo is now showing about 200 F. I use it for roating coffee so I am not sure it is accurate in this situation as it is .188 in diameter. Infared is still showing about 260-270 F.
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Old 6th July 2012, 10:44 PM   #1596
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Yes it is about a half a foot. It was doing it with dummy load. Which was 5R5. I have since hooked it up. I have now unplugged it seeing as how you say that is too hot.
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Old 6th July 2012, 10:46 PM   #1597
Salas is offline Salas  Greece
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Best case 188F=87C. Junction to case is 1.7C/W in that semi (IR datasheet), so you are at 100C junction temp for say 5W. (Meltdown @ usually around 175C). Either you got a very small sink for that setting, or you are using a dummy load that isn't simulating as strong current draw as the destination load's average and too much is burned on the Mosfet. Your voltage setting and dummy load value please? Also some info about your sink (C/W) or photo?
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Old 6th July 2012, 10:57 PM   #1598
mjock3 is offline mjock3  United States
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Voltage setting is 5 volts.
Click the image to open in full size.Not sure how to upload picture. When I had a dummy load hooked up it was 5r5 15 watt
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Old 6th July 2012, 11:04 PM   #1599
Salas is offline Salas  Greece
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Go Advanced under reply messages, there is upload pics menu. Make it say 1024X768 first.
Something here does not compute. If you got 1A CCS setting and a 5.5R dummy, then 0.9A should have gone to the dummy @ 5V. The output Mosfet should dissipate only 0.1A*5V=0.5W. But yours is suspiciously hot. Maybe you run much higher CCS? You will know by voltage across the CCS setting resistor divided by its value. Is the dummy hot at all?
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Old 6th July 2012, 11:04 PM   #1600
mjock3 is offline mjock3  United States
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Heat sinks I am using are Aavid Thermalloy 8C/W P/N 531302B02500G
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