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TL2218-285PWRG4 bảng dữ liệu(PDF) 6 Page - Texas Instruments |
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TL2218-285PWRG4 bảng dữ liệu(HTML) 6 Page - Texas Instruments |
6 / 13 page TL2218285, TL2218285Y EXCALIBUR CURRENT MODE SCSI TERMINATOR SLVS072C − DECEMBER 1992 − REVISED OCTOBER 1995 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 8−6 THERMAL INFORMATION The need for smaller surface-mount packages for use on compact printed-wiring boards (PWB) causes an increasingly difficult problem in the area of thermal dissipation. In order to provide the systems designer with a better approximation of the junction temperature rise in the thin-shrink small-outline package (TSSOP), the junction-to-lead thermal resistance (RθJL) is provided along with the more typical values of junction-to-ambient and junction-to-case thermal resistances, RθJA and RθJC. RθJL is used to calculate the device junction temperature rise measured from the leads of the unit. Consequently, the junction temperature is dependent upon the board temperature at the leads, RθJL, and the internal power dissipation of the device. The board temperature is contingent upon several variables, including device packing density, thickness, material, area, and number of interconnects. The RθJL value depends on the number of leads connecting to the die-mount pad, the lead-frame alloy, area of the die, mount material, and mold compound. Since the power level at which the TSSOP can be used is highly dependent upon both the temperature rise of the PWB and the device itself, the systems designer can maximize this level by optimizing the circuit board. The junction temperature of the device can be calculated using the equation TJ = (PD × RθJL) + TL where TJ = junction temperature, PD = power dissipation, RθJL = junction-to-lead thermal resistance, and TL = board temperature at the leads of the unit. The values of thermal resistance for the TL2218-285 PW are as follows: Thermal Resistance Typical Junction Rise RθJA 151 °C/W RθJC 31 °C/W RθJL 50.5 °C/W TYPICAL CHARACTERISTICS Table of Graphs FIGURE IO Output current vs Input voltage 4 VO Output voltage vs Input voltage 5 IO Output current vs Junction temperature 6 VO Output voltage vs Junction temperature 7 |
Số phần tương tự - TL2218-285PWRG4 |
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Mô tả tương tự - TL2218-285PWRG4 |
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