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Old 6th July 2012, 11:09 PM   #1601
mjock3 is offline mjock3  United States
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Here's a picture
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Old 6th July 2012, 11:13 PM   #1602
Salas is offline Salas  Greece
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Quote:
Originally Posted by mjock3 View Post
Heat sinks I am using are Aavid Thermalloy 8C/W P/N 531302B02500G
Tiny in any case. How hot is the sink itself?
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Old 6th July 2012, 11:17 PM   #1603
Salas is offline Salas  Greece
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Here's a picture
Mount the Mosfet higher on top mounting hole. Half its back ain't touching it seems. That can explain it if I see well.
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Old 6th July 2012, 11:18 PM   #1604
mjock3 is offline mjock3  United States
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I is hot. How much larger sink do I need? Sorry I thought they were ok.
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Old 6th July 2012, 11:19 PM   #1605
mjock3 is offline mjock3  United States
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Mount the Mosfet higher on top mounting hole. Half its back ain't touching it seems. That can explain it if I see well.
OK I will try that. Later tonight. Thank you.
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Old 6th July 2012, 11:23 PM   #1606
Salas is offline Salas  Greece
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I is hot. How much larger sink do I need? Sorry I thought they were ok.
You could do OK if something like 60-65C can be measured on them after CCS setting for the purpose, dummy, and mounting are good. I generally prefer no more than 50-55C for long term, heatwave periods etc. but ~150F on sink itself is decently reliable for such semis.
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Old 6th July 2012, 11:23 PM   #1607
mjock3 is offline mjock3  United States
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Salas,

I also bought some heatsinks that are 5C/W, would that help?
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Old 6th July 2012, 11:24 PM   #1608
Salas is offline Salas  Greece
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How much voltage there is across the blue 2.5R ?
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Old 6th July 2012, 11:26 PM   #1609
mjock3 is offline mjock3  United States
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It was 2.45 volts.
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Old 6th July 2012, 11:26 PM   #1610
Salas is offline Salas  Greece
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Salas,

I also bought some heatsinks that are 5C/W, would that help?
If they mount better use them. Contact quality between semi's full back and sink is of main importance, think about the lengths overclocking PC users go for CPU compounds, optimal spread, you get the importance, same stuff but more tolerable here.
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