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LM341T-5.0 数据表(PDF) 6 Page - National Semiconductor (TI) |
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LM341T-5.0 数据表(HTML) 6 Page - National Semiconductor (TI) |
6 / 11 page Typical Performance Characteristics (Continued) Design Considerations The LM78MXX/LM341XX fixed voltage regulator series has built-in thermal overload protection which prevents the de- vice from being damaged due to excessive junction tem- perature. The regulators also contain internal short-circuit protection which limits the maximum output current, and safe-area pro- tection for the pass transistor which reduces the short-circuit current as the voltage across the pass transistor is in- creased. Although the internal power dissipation is automatically lim- ited, the maximum junction temperature of the device must be kept below +125˚C in order to meet data sheet specifica- tions. An adequate heatsink should be provided to assure this limit is not exceeded under worst-case operating condi- tions (maximum input voltage and load current) if reliable performance is to be obtained). 1.0 Heatsink Considerations When an integrated circuit operates with appreciable cur- rent, its junction temperature is elevated. It is important to quantify its thermal limits in order to achieve acceptable per- formance and reliability. This limit is determined by summing the individual parts consisting of a series of temperature rises from the semiconductor junction to the operating envi- ronment. A one-dimension steady-state model of conduction heat transfer is demonstrated in The heat generated at the device junction flows through the die to the die attach pad, through the lead frame to the surrounding case material, to the printed circuit board, and eventually to the ambient envi- ronment. Below is a list of variables that may affect the ther- mal resistance and in turn the need for a heatsink. RθJC(Component Variables) Rθ CA(Application Variables) Leadframe Size & Material Mounting Pad Size, Material, & Location No. of Conduction Pins Placement of Mounting Pad Die Size PCB Size & Material Die Attach Material Traces Length & Width Molding Compound Size and Material Adjacent Heat Sources Volume of Air Air Flow Ambient Temperature Shape of Mounting Pad Quiescent Current DS010484-16 Output Impedance DS010484-17 Line Transient Response DS010484-7 Load Transient Response DS010484-8 www.national.com 6 |
类似零件编号 - LM341T-5.0 |
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类似说明 - LM341T-5.0 |
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