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Old 7th July 2012, 12:13 AM   #1601
Salas is online now Salas  Greece
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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 7th July 2012, 12:17 AM   #1602
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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 7th July 2012, 12:18 AM   #1603
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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 7th July 2012, 12:19 AM   #1604
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Originally Posted by Salas View Post
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 7th July 2012, 12:23 AM   #1605
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Originally Posted by mjock3 View Post
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 7th July 2012, 12:23 AM   #1606
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 7th July 2012, 12:24 AM   #1607
Salas is online now Salas  Greece
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How much voltage there is across the blue 2.5R ?
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Old 7th July 2012, 12:26 AM   #1608
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It was 2.45 volts.
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Old 7th July 2012, 12:26 AM   #1609
Salas is online now 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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Old 7th July 2012, 12:29 AM   #1610
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It was 2.45 volts.
0.98A if it is 2.5R spot on, so no mistake there. Should be the mounting back gap. Solve that first. Was the dummy hot also? I wanna know that current flows to dummy for sure too.
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