suppliers of AT27C020-12JI and PDF data of AT27C020-12JI

The LT1587-1.5 protects the device under overload condi- tions with internal power and thermal limiting circuitry. However, for normal continuous load conditions, do not exceed maximum junction temperature ratings. It isimpor- tant to consider all sources of thermal resistance from junction-to-ambient. These sources include the junction- to-case resistance, the case-to-heat sink interface resis- tance, and the heat sink resistance. Thermal resistance specifications have been developed to more accurately reflect device temperature and ensure safe operating tem- peratu res. The electrical characteristics section provides a separate thermal resistance and maximum junction tem- perature for both the control circuitry and the power transistor. Older regulators with a single junction-to-case thermal resistance specification, use an average of the two values provided here and allow excessive junction tem- peratu res under certain conditions of ambient temperature and heat sink resistance. Calculate the maximum junction temperature for both sections to ensure that both thermal limits are met.