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SPI-8010A データシート(PDF) 6 Page - Allegro MicroSystems |
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SPI-8010A データシート(HTML) 6 Page - Allegro MicroSystems |
6 / 9 page SPI-8010A 3 A, DC/DC Step-Down Converter 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 Switching Regulators 6 APPLICATIONS INFORMATION (cont.) Soft-Start Capcitor (C4). Soft start is enabled by connecting a capacitor between terminal 4 and ground. The device may be turned off (chip enable) by decreasing the terminal 4 voltage below 0.5 V with either an npn small- signal transistor or the output of open-collector TTL. If both a large soft-start capacitor and chip on/off control are desired, collector current limiting must be used to prevent transistor damage. No external voltage can be applied to terminal 4. Overcurrent Protection. The SPI-8000A series has a built-in fold-back type overcurrent protection circuit, which limits the output current at a start-up mode. It thus cannot be used in applications that require current at the start-up mode such as: (1) constant-current load, (2) power supply with positive and negative outputs to common load (a center-tap type power supply), or (3) raising the output voltage by putting a diode or a resistor between the device ground and system ground. Parallel Operation. Parallel operation to increase load current is not permitted. Thermal Protection. Circuitry turns off the device when the junction temperature rises above 170°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 exposed pad. Therefore, it is very effective for heat radiation to enlarge the copper area that is connected to the pad. The graph on page 2 illustrates 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 θJL) + TL where P D = VIII – VOIO – VFIO(1 – [VO/VI]), V F = the Schottky diode forward voltage, and RθJL = 18°C/W. Layout Guideline |
同様の部品番号 - SPI-8010A |
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同様の説明 - SPI-8010A |
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