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Thanks for all the terrific suggestions!
I seem to be having success using a small flake of mica insulator between the tab and the thermocouple. This and some thermal grease between everything is giving fairly accurate results- within a few degrees I suspect.
I do have access to an IR...
method measure fet temp
Does anyone know of a good thermal probe for measuring FET temperature in a live circuit? I need to monitor FET case temperature in my full-bridge SMPS. I'm using a Fluke 80TK- the kind that connects to a DMM, but it's giving me erroneous readings when the circuit is...
I have a question about losses on a SMPS I'm developing. This is a 2000W full-bridge SMPS for an audio amp- hard-switched at 100kHz.
If I drive the FET gates full on as fast as I can, I get this large voltage ringing on the output secondary diodes that comes close, if not exceeding, the...
I should clarify that I meant it is uncommon to have a via in the middle of a surface mount pad. A through-hole pad basically is a via. A large one maybe, but still is capable of passing a signal from top to bottom of board. You are right, they are usually always plated as far as what I've designed.
It is not common practice to place a via in a pad. If it is an SMT pad, though, I would think when printing the solder paste the via would effectively be filled with paste as well as pasting the pad. When in reflow, the via is plugged with solder so it would not wick from the pad. On the other...
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