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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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SC4524ASETRT Fiches technique(PDF) 1 Page - Semtech Corporation |
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SC4524ASETRT Fiches technique(HTML) 1 Page - Semtech Corporation |
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1 / 18 page  POWER MANAGEMENT November 2, 2007 28V 2A Step-Down Switching Regulator SC4524A Typical Application Circuit Features Wide input range: 3V to 28V 2A Output Current 200kHz to 2MHz Programmable Frequency Precision V Feedback Voltage Peak Current-Mode Control Cycle-by-Cycle Current Limiting Hiccup Overload Protection with Frequency Foldback Soft-Start and Enable Thermal Shutdown Thermally Enhanced 8-pin SOIC Package Fully RoHS and WEEE compliant Applications XDSL and Cable Modems Set Top Boxes Point of Load Applications CPE Equipment DSP Power Supplies LCD and Plasma TVs Description The SC4524A is a constant frequency peak current-mode step-down switching regulator capable of producing 2A output current from an input ranging from 3V to 28V. The switching frequency of the SC4524A is programmable up to 2MHz, allowing the use of small inductors and ceramic capacitors for miniaturization, and high input/ output conversion ratio. The SC4524A is suitable for next generation XDSL modems, high-definition TVs and various point of load applications. Peak current-mode PWM control employed in the SC4524A achieves fast transient response with simple loop compensation. Cycle-by-cycle current limiting and hiccup overload protection reduces power dissipation during output overload. Soft-start function reduces input start- up current and prevents the output from overshooting during power-up. The SC4524A is available in SOIC-8 EDP package. Figure 1. 1MHz 10V-28V to 5V/2A Step-down Converter Efficiency 40 45 50 55 60 65 70 75 80 85 90 0 0.5 1 1.5 2 Load Current (A) VIN = 24V SS270 REV 4 VIN = 12V Efficiency of the 1MHz 10V-28V to 5V/2A Step-Down Converter (Front Page) 12 12 SC4524A GND IN SW BST L1 8.2mH C1 0.1mF SS/EN COMP FB D2 20BQ030 10.5k R6 42.2k 10nF C8 10pF C5 2.2nF L1: Coiltronics DR73-8R2 OUT 5V/2A D1 1N4148 10V – 28V ROSC C2: Murata GRM31CR60J226K C4 2.2mF C4: Murata GRM31CR71H225K VIN C2 22mF C7 R4 18.2k R5 28.0k R7 1MHz 10V-28V to 5V/2A Step-Down Converter (Front Page Schematic) |
Numéro de pièce similaire - SC4524ASETRT |
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Description similaire - SC4524ASETRT |
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