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GM1117-5.0TB3T Datasheet(PDF) 8 Page - Gamma Microelectronics Inc. |
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GM1117-5.0TB3T Datasheet(HTML) 8 Page - Gamma Microelectronics Inc. |
8 / 13 page 8 The thermal characteristics of an IC depend four fac- tors: 1. Maximum Ambient Temperature T (°C) A 2. Power Dissipation P (Watts) D 3. Maximum Junction Temperature T (°C) J 4. Thermal Resistance Junction to ambient R JA Q (°C/W) The relationship of these four factors is expressed by equation (1): Maximum ambient temperature and power dissipa- tion are determined by the design while the maximum junction temperature and thermal resistance depend on the manufacturer and the package type. The maximum power dissipation for a regulator is ex- pressed by equation (2): where: V is the maximum input voltage, IN(max) V is the minimum output voltage, OUT(min) I is the maximum output current OUT(max) I is the maximum quiescent current at I . Q OUT(max) A heat sink effectively increases the surface area of the package to improve the flow of heat away from the IC into the air. Each material in the heat flow path between the IC and the environment has a thermal re- sistance. Like series electrical resistances, these re- sistance are summed to determine R , the total QJA thermal resistance between the junction and the air. This is expressed by equation (3): Where all of the following are in °C/W: R is thermal resistance of junction to case, QJC R is thermal resistance of case to heat sink, QCS R is thermal resistance of heat sink to ambient air QSA The value for R is calculated using equation (3) QJA and the result can be substituted in equation (1). The value for R is 3.5°C/W for a given package type QJC based on an average die size. For a high current reg- ulator such as the GM1117 the majority of the heat is generated in the power transistor section. T = T + P X R ........ JAD JA (1) Q P = { V - V } I + V I ) D(max) IN(max) OUT(min) OUT(max IN(max) Q ........(2) R = R + R + R JA JC CS SA ........(3) QQQQ A A MICROELECTRONICS GM1117 1.0A LOW DROPOUT PRECISION LINEAR REGULATORS Power Management |
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