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SC4525EEVB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4525EEVB Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 23 page  HIGH-RELIABILITY PRODUCTS 28V 3A Step-Down Switching Regulator SC4525EM © 207 Semtech Corporation Typical Application Circuit Features Wide Input Voltage Range: 3V to 28V 3A 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 Military Temperature Range: -55°C to +25°C Applications Point of Load Applications Description The SC4525EM is a constant frequency peak current-mode step-down switching regulator capable of producing 3A output current from an input ranging from 3V to 28V. The switchingfrequencyoftheSC4525EMcanbeprogrammed up to 2MHz for component miniaturization or it can be set at lower frequencies to accommodate high step-down ratios. The SC4525EM is suitable for various point of load applications. Peak current-mode PWM control employed in the SC4525EM 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 SC4525EM is available in SOIC-8 EDP package. Figure 1. 1MHz 10V - 28V to 5V/3A Step-down Converter Efficiency of the 1M Hz 10V-28V to 5V/3A Step-Down Converter (Front Page) Efficie ncy 40 50 60 70 80 90 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Load Current (A) VIN = 24V SC 4525A VIN = 12V Rev. 2.0 SC4525EM G ND IN SW BST L1 5.2mH C1 0.33 mF SS/EN CO M P FB D2 20BQ 030 8.25k R6 33.2k 22nF C8 22pF C 5 2.2nF L1: Coiltronics CD 1- 5R 2 O UT 5V/3A D1 1N4148 10V – 28V RO SC C2: M urata G RM 31CR60J106K C4 4.7mF C4: M urata G RM 32ER71H475K V IN C2 10mFX3 C7 R4 15.8k R 5 12.7k R7 R 8 10 C9 470pF |
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