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APPNOTESMP9100 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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APPNOTESMP9100 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
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1 / 2 page  T Heat Sink Temperature R Thermal Resistance - Heat Sink to Ambient Air or Reference Temperature T Ambient or Reference Temperature P D T Resistor Film Temperature (Max. 175 °C) R Thermal Resistance - Resistor Film to Exposed Ceramic Case Interface T Case Temperature (Exposed Ceramic Surface) R Thermal Resistance - Case to Heat Sink Surface (Pad or Thermal Grease) Detail of Cross Section Center Line through Center of Ceramic Element Mounting Screw Belleville Washer Thermal Grease or Pad J ØJC C ØCS S ØSA A Heat Sink (mounting surface) CAD K DOC Applications Engineering Note: AEN-0102 Understanding the Power Rating of Caddock MP9100 Resistors Understanding the Power Rating The maximum power rating of the Caddock MP9100 (TO-247 type) resistor is specified with the ceramic surface maintained at 25 °C using the same method established and proven by power semiconductor manufacturers over many years. Caddock’s careful design practices and thorough re- liability testing assure the user that the part will per- form to all published specifications as long as its case temperature (T C) does not exceed that specified in Figure 1. Surge ratings must be observed. In high power applications, the actual power dissipa- tion capability of the resistor will be greatly depen- dent on the heat sink, mounting method, interface ma- terial characteristics and ambient temperature, (T A). The maximum continuous power rating (100 Watts) for the Caddock MP9100 resistor is based on a case tem- perature (T C) of 25°C measured at the center of the exposed ceramic surface. The Caddock MP9100 re- sistor has a thermal resistance of 1.5 °C/watt (R ØJC), from the junction (resistor film) to the case (exposed ceramic case interface). For a case temperature (T C) above 25 °C, derating is necessary. Allowable power dissipation (P D, watts) may be deter- mined by the following equation. Equation 1 P D = Using the information provided in Fig 2, allowable power dissipation and temperature gradients can be estimated. Typical thermal resistance of various ma- terials can be found in Table 1 on the next page. It should be noted that material characteristics are those provided by the manufacturers and these can vary greatly if careful manufacturing processes are not ob- served. Caddock suggests that actual temperature measurements should be made under worst case con- ditions to assure maximum reliability of a design. CAD K DOC © Caddock Electronics, 2002 Figure 2 MP9100 with Mounting Screw and Belleville Washer Figure 1 A copy of this Application Note can be obtained at www.caddock.com (R ØJC + RØCS + RØSA) T J - TA 100 % 80 % 60 % 40 % 20 % 0 25 100 175 Case Temperature (T , °C) g C MP9100 Derating Curve Release Date: 9/20/02, Rev. A, Rev. Date: 9/20/02 Page 1 of 2 |
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