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APL5302-32B Datasheet(PDF) 11 Page - Anpec Electronics Coropration |
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APL5302-32B Datasheet(HTML) 11 Page - Anpec Electronics Coropration |
11 / 19 page Copyright ANPEC Electronics Corp. Rev. B.1 - Mar., 2004 APL5301/2 www.anpec.com.tw 11 Thermal protection limits total power dissipation in the device. When the junction temperature exceeds T J=+150°C, the thermal sensor generates a logic sig- nal to turn off the pass transistor and allows IC to cool. When the IC’s junction temperature is down by 10 °C, the thermal sensor will turn the pass transistor on again, resulting in a pulsed output during continu- ous thermal protection. Thermal protection is designed to protect the APL5301/2 in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction temperature of T J=+150°C. Operating Region and Power Dis- sipation The thermal resistance of the case to circuit board, and the rate of air flow all control the APL5301/2’s maximum power dissipation. The power dissipation across the device is P D = IOUT (VIN-VOUT) and the maxi- mum power dissipation is: P DMAX = (TJ-TA) / (θJC +θCA) where T J-TA is the temperature difference between the junction and ambient air, θ JC is the thermal resistance of the package, and θ CA is the thermal resistance through the printed circuit board, copper traces, and other materials to the ambient air. The GND pin of the APL5301 and APL5302 that the packages ard SOT-23-5, SOT-89-5 AND SOP-8 pro- vide an electrical connection to ground and channel- ing heat away. If power dissipation is large, connect the GND pin to ground using a large pad or ground plane, can improve the problem of over heat of IC. Thermal Protection |
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