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LT1083CP-5 Datasheet(PDF) 9 Page - Linear Technology |
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LT1083CP-5 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LT1083/LT1084/LT1085 Fixed 1083ffd case- to-heat sink interface, and heat sink resistance itself. New thermal resistance specifications have been devel- oped to more accurately reflect device temperature and ensure safe operating temperatures. The data section for these new regulators provides a separate thermal resis- tance and maximum junction temperature for both the Control Section and the Power Section. Previous regula- tors, with a single junction-to-case thermal resistance specification, used an average of the two values provided here and therefore could allow excessive junction tem- peratures under certain conditions of ambient tempera- ture and heat sink resistance. To avoid this possibility, calculations should be made for both sections to ensure that both thermal limits are met. Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. This is the lowest resistance path for heat flow. Proper mounting is required to ensure the best possible thermal flow from this area of the package to the heat sink. Thermal compound at the case-to-heat sink interface is strongly recommended. If the case of the device must be electroni- cally isolated, a thermally conductive spacer can be used as long as its added contribution to thermal resistance is considered. Note that the case of all devices in this series is electronically connected to the ouput. For example, using a LT1083-5CP (TO-3P, Commercial) and assuming: VIN(max continuous) = 9V, VOUT = 5V, IOUT = 6A, TA = 75°C, θHEAT SINK = 1°C/W, θCASE-TO-HEAT SINK = 0.2°C/W for P package with thermal compound. Power dissipation under these conditions is equal to: PD = (VIN – VOUT) (IOUT) = 24W Junction temperature will be equal to: TJ = TA + PD (θHEAT SINK + θCASE-TO-HEAT SINK + θJC) For the Control Section: TJ = 75°C + 24W (1°C/W + 0.2°C/W + 0.5°C/W) = 118 °C 118 °C < 125°C = TJMAX (Control Section Commer- cial Range) For the Power Transistor: TJ = 75°C + 24W (1°C/W + 0.2°C/W + 1.6°C/W) = 142 °C 142 °C < 150°C = TJMAX (Power Transistor Commer- cial Range) In both cases the junction temperature is below the maximum rating for the respective sections, ensuring reliable operation. High Efficiency Regulator – + 28V INPUT 28V 470 Ω 28V 4N28 1N914 1N914 LT1011 10k 10k 10k 1k 1M MR1122 1mH 10,000 μF OUTPUT LT1083-5 OUT IN GND LT1083/4/5 TA03 + APPLICATIO S I FOR ATIO TYPICAL APPLICATIO S Paralleling Regulators LT1083-5 OUT IN VIN VOUT = 5V IOUT = 0A TO 15A GND LT1083-5 0.015 Ω OUT 2 FEET #18 WIRE* IN GND *THE #18 WIRE ACTS AS BALLAST RESISTANCE INSURING CURRENT SHARING BETWEEN BOTH DEVICES LT1083/4/5 TA04 |
Similar Part No. - LT1083CP-5 |
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Similar Description - LT1083CP-5 |
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