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MCP1824 датащи(PDF) 23 Page - Microchip Technology |
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MCP1824 датащи(HTML) 23 Page - Microchip Technology |
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23 / 34 page ![]() © 2007 Microchip Technology Inc. DS22070A-page 23 MCP1824/MCP1824S 5.3.1.2 Junction Temperature Estimate To estimate the internal junction temperature, the calculated temperature rise is added to the ambient or offset temperature. For this example, the worst-case junction temperature is estimated below: 5.3.1.3 Maximum Package Power Dissipation at 60°C Ambient Temperature From this table, you can see the difference in maximum allowable power dissipation between the SOT-223-5 package and the SOT-23-5 package. TJ =TJRISE + TA(MAX) TJ = 19.1°C + 60.0°C TJ =79.1°C SOT-223-5 (62°C/W R θJA): PD(MAX) = (125°C – 60°C) / 62°C/W PD(MAX) = 1.048W SOT-23-5 (256°C/Watt R θJA): PD(MAX) = (125°C – 60°C)/ 256°C/W PD(MAX) = 0.254W |
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