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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MIC2033 датащи(PDF) 14 Page - Microchip Technology |
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MIC2033 датащи(HTML) 14 Page - Microchip Technology |
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14 / 28 page  MIC2033 DS20005539C-page 14 2018 - 2022 Microchip Technology Inc. and its subsidiaries. 4.7 Thermal Measurements It is always wise to measure the IC’s case temperature to make sure that it is within its operating limits. Although this might seem like a very elementary task, it is very easy to get erroneous results. The most common mistake is to use the standard thermal couple that comes with the thermal voltage meter. This thermal couple wire gauge is large, typically 22 gauge, and behaves like a heatsink, resulting in a lower case measurement. There are two suggested methods for measuring the IC case temperature: a thermal couple or an infrared thermometer. If a thermal couple is used, it must be constructed of 36 gauge wire or higher to minimize the wire heatsinking effect. In addition, the thermal couple tip must be covered in either thermal grease or thermal glue to make sure that the thermal couple junction is making good contact to the case of the IC. This thermal couple from Omega (5SC-TT-K-36-36) is adequate for most applications. To avoid this messy thermal couple grease or glue, an infrared thermometer is recommended. Most infrared thermometers’ spot size is too large for an accurate reading on small form factor ICs. However, an IR thermometer from Optris has a 1 mm spot size, which makes it ideal for the 2 mm x 2 mm DFN package. Also, get the optional stand. The stand makes it easy to hold the beam on the IC for long periods of time. |
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