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9 / 20 page 9/16 TSZ02201-0RDR0GZ00310-1-2 © 2015 ROHM Co., Ltd. All rights reserved. 08.Jan.2015 Rev.001 www.rohm.com TSZ22111 • 15 • 001 BU4551B BU4551BF BU4551BFV Power Dissipation Power dissipation (total loss) indicates the power that can be consumed by IC at TA=25°C(normal temperature). IC is heated when it consumed power, and the temperature of IC chip becomes higher than ambient temperature. The temperature that can be accepted by IC chip depends on circuit configuration, manufacturing process, and consumable power is limited. Power dissipation is determined by the temperature allowed in IC chip(maximum junction temperature) and thermal resistance of package(heat dissipation capability). The maximum junction temperature is typically equal to the maximum value in the storage temperature range. Heat generated by consumed power of IC radiates from the mold resin or lead frame of the package. The parameter which indicates this heat dissipation capability(hardness of heat release)is called thermal resistance, represented by the symbol θJA (°C/W).The temperature of IC inside the package can be estimated by this thermal resistance. Figure 17 shows the model of thermal resistance of the package. Thermal resistance θJA, ambient temperature TA, maximum junction temperature TJmax, and power dissipation PD can be calculated by the equation below: θJA = (TJmax - TA) / PD (°C/W) Derating curve in Figure 18 indicates power that can be consumed by IC with reference to ambient temperature. Power that can be consumed by IC begins to attenuate at certain ambient temperature. This gradient is determined by thermal resistance θJA. Thermal resistance θJA depends on chip size, power consumption, package, ambient temperature, package condition, wind velocity, etc even when the same of package is used. Thermal reduction curve indicates a reference value measured at a specified condition. I/O Equivalent Circuits Pin No. Control Input Terminal Input / Output Terminals 9 1,2,3,4,5,6,10,11,12,13,14,15 Equivalence Circuit VDD VDD GND GND Figure 18. Derating Curve Figure 17. Thermal Resistance 周囲温度 Ta [℃] チップ 表面温度 Tj [℃] 消費電力 P [W] Ambient temperature TA (℃) Chip surface temperature TJ(℃) θJA =( Tjmax - TA)/ PD (°C/W) VDD VDD VDD VDD GND 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 25 50 75 100 125 150 Ambient Temperature [℃] BU4551B (DIP16) BU4551BFV (SSOP-B16) BU4551BF (SOP16) 85 VSS VEE VSS |
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