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#1
September 26th 06, 01:33 PM
posted to rec.radio.cb
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Thought this was puzzling...
LeIand C. Scot wrote:
Tacking the diodes on to the case of the transistor works better than attaching them to the heat sink due to the relatively slow thermal response, the heat sink changes temperature slower than the cap on the transistor. That's simply not true... while the heat sinks response might be a bit slower... it's a much better indicator of the temp of the transistor die. The ceramic cap on those transistors will overshoot the die temp in both directions because of it's poor thermal contact with the die. www.telstar-electronics.com |
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#2
September 26th 06, 01:49 PM
posted to rec.radio.cb
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Thought this was puzzling...
On a sunny day (26 Sep 2006 05:33:33 -0700) it happened "Telstar Electronics"
wrote in .com: LeIand C. Scot wrote: Tacking the diodes on to the case of the transistor works better than attaching them to the heat sink due to the relatively slow thermal response, the heat sink changes temperature slower than the cap on the transistor. That's simply not true... while the heat sinks response might be a bit slower... it's a much better indicator of the temp of the transistor die. The ceramic cap on those transistors will overshoot the die temp in both directions This is not correct. there is no 'overshoot' in temp possible. Unless you know how to heat solder to 250C with a 200C soldering iron? An other Telstar miracle ;-)? The thermal response will be faster, resulting in better protection. A slower response could result in reducing current too late. |
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#3
September 26th 06, 02:04 PM
posted to rec.radio.cb
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Thought this was puzzling...
Jan Panteltje wrote:
This is not correct. there is no 'overshoot' in temp possible. Unless you know how to heat solder to 250C with a 200C soldering iron? An other Telstar miracle ;-)? The thermal response will be faster, resulting in better protection. A slower response could result in reducing current too late. You're right... overshoot was the wrong word. I think you knew what I meant... but if you didn't... I'll clarify. There is no friggin' way... having a sensing device on the ceramic cap of those transistors tracks the die temp as good as having that same tracking device in close proximity on the geat sink. www.telstar-electronics.com |
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