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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC2440 датащи(PDF) 1 Page - Semtech Corporation |
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SC2440 датащи(HTML) 1 Page - Semtech Corporation |
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1 / 26 page  1 www.semtech.com SC2440 2.5 MHz Dual Switching Regulator with Integrated 2A Switches POWER MANAGEMENT Revision: March 5, 2007 Description Features Applications Typical Application Circuit u Up to 2.5 MHz/Channel Programmable Switching Frequency u Fixed Frequency Current-mode Control u Wide Input Voltage Range 2.8V to 20V u Out of Phase Switching Reduces Ripple u Cycle-by-cycle Current-limiting u Independent Shutdown/soft-start Pins u Independent Hiccup Overload Protection u Independent Power-Good Indicators u Two 2A Integrated Switches u External Synchronization u Thermal Shutdown u Thermally Enhanced 16-pin TSSOP Package The SC2440 is an adjustable frequency dual current- mode switching regulator with 2A integrated switches. Its high frequency operation allows the use of small inductors and capacitors, resulting in very compact power supplies. The SC2440 is suitable for next generation XDSL modems requiring operating frequencies in excess of 1.5 MHz. The two channels operate at 180° out of phase for reduced input voltage ripples. Separate soft start/ shutdown pins allow independent control and output sequencing for latch-up prevention. The SC2440 can also be externally synchronized up to 2.5 MHz per channel. Current-mode PWM control allows fast transient response with simple loop compensation. Cycle-by-cycle current limiting and hiccup overload protection reduce power dissipation during overload. u XDSL and Cable Modems u Set-up Boxes u Point of Load Applications u CPE Equipment u DSP Power Supplies u Disk Drives C15 10 µF R3 40.2K SC2440 GND SS2 IN SW1 FB2 ROSC COMP2 C9 10pF R7 24.3K BOOST1 C1 10 µF BOOST2 SW2 L1 3.3 µH C2 0.1 µF L2 4.4 µH C4 0.1 µF PGOOD2 SS1 PGOOD1 COMP1 FB1 C3 10 µF D1 UPS120 D2 UPS120 R8 100K R6 100K R9 15K OUT1 3.3V/2A 10K R4 10K R2 R1 23.3K C7 22nF C10 22nF C8 220pF C6 10pF R5 15.4K C5 470pF D4 1N4148 SYNC L1: Sumida CR43 L2: F alco D04012 OUT2 5V/2A D3 1N4148 VIN 12V Efficiency vs Load Current Figure 1. 1.3MHz 12V to 3.3V and 5V Step-down Converter 50 55 60 65 70 75 80 85 90 95 0 0.5 1 1.5 2 Load Current (A) VOUT2 = 5V VOUT1 = 3.3V VIN = 12V |
Аналогичный номер детали - SC2440 |
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Аналогичное описание - SC2440 |
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