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SI-8090JD Folha de dados(PDF) 6 Page - Allegro MicroSystems |
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SI-8090JD Folha de dados(HTML) 6 Page - Allegro MicroSystems |
6 / 10 page SI-8090JD Step-Down to 9.0 V, 1.5 A, DC/DC Converter 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 Switching Regulators 6 Layout Guideline APPLICATIONS INFORMATION (cont.) Thermal Protection. Circuitry turns off the switching transistor when the junction temperature rises above 150°C. It is intended only to protect the device from failures due to excessive junction temperatures and should not imply that output short circuits or continuous overloads are permitted. Heat Radiation and Reliability. The reliability of the IC is directly related to the junction temperature (T J) in its operation. Accordingly, careful consideration should be given to heat dissipation. The inner frame on which the integrated circuit is mounted is connected to the GND terminal (pin 3). Therefore, it is very effective for heat radiation to enlarge the copper area that is connected to the GND terminal. The graph illus- trates the effect of the copper area on the junction-to- ambient thermal resistance (RθJA). The junction temperature (T J) can be determined from either of the following equations: T J = (PDR θJA) + TA or T J = (PDR θJC) + TC where P D = VIII – VOIO – VFIO(1 – [VO/VI]) or the adjacent graph, V F = the Schottky diode forward voltage, and RθJC =3°C/W. |
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