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LM1117LDX-1.8 Folha de dados(PDF) 11 Page - Texas Instruments |
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LM1117LDX-1.8 Folha de dados(HTML) 11 Page - Texas Instruments |
11 / 32 page LM1117-N, LM1117I www.ti.com SNOS412M – FEBRUARY 2000 – REVISED MARCH 2013 Figure 22. Regulator with Protection Diode HEATSINK REQUIREMENTS When an integrated circuit operates with an appreciable current, its junction temperature is elevated. It is important to quantify its thermal limits in order to achieve acceptable performance 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 environment. A one-dimensional steady-state model of conduction heat transfer is demonstrated in Figure 23. 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 environment. Below is a list of variables that may affect the thermal resistance and in turn the need for a heatsink. R θJC (Component Variables) R θCA (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 Ambient Temperatue Shape of Mounting Pad The case temperature is measured at the point where the leads contact with the mounting pad surface Figure 23. Cross-Sectional View of Integrated Circuit Mounted on a Printed Circuit Board The LM1117-N regulators have internal thermal shutdown to protect the device from over-heating. Under all possible operating conditions, the junction temperature of the LM1117-N must be within the range of 0°C to 125°C. A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. To determine if a heatsink is needed, the power dissipated by the regulator, PD , must be calculated: IIN = IL + IG (2) Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM1117-N LM1117I |
Nº de peça semelhante - LM1117LDX-1.8 |
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Descrição semelhante - LM1117LDX-1.8 |
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