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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC4541 датащи(PDF) 1 Page - Semtech Corporation |
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SC4541 датащи(HTML) 1 Page - Semtech Corporation |
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1 / 19 page  © 2011 Semtech Corporation High Frequency LED Driver with Integrated Schottky and Simple Interconnect SC4541 POWER MANAGEMENT 1 Typical Application Circuit IN EN FB OUT SW GND SC4541 PWM Dimming VIN 2.9V to 22V VOUT Up to 25V C1 1μF 10μF Boost Topology IOUT up to 100mA C2 RS 10Ω 1μF 7 WLED @ 20mA L1 Features V IN Range — 2.9V to 22V V OUT Range — Up to 25V I OUT Range: Up to 100mA (Boost) Up to 200mA (Buck) Drives Up to 7 Series WLEDs (Boost) Drives Up to 5 Series WLEDs (Buck) Integrated Schottky Rectifier Single-Wire LED Connect Current Mode Control Frequency — 2.0MHz No External Compensation Direct PWM Dimming 100:1 Range at 500Hz Open-LED Protection — 27V Low Shutdown Current < 1µA Package Options: Low Profile MLPD-UT, 6-pin 2x2 x0.6(mm) SOT23, 6-pin 2.9x2.8 x1.45(mm) Lead-free, Halogen-Free and WeEE/RoHS Compliant Applications Keypad Illumination DSC and DSLR Display Backlight Cellular Handsets Automotive Lighting Description The SC4541 is a fully integrated, high voltage boost (step- up) and buck (step-down) LED driver. The input voltage range is 2.9V to 22V with output voltage up to 25V. The device is capable of driving up to 7 white LEDs. The high side sense enables a single-wire LED connection by taking advantage of the available system ground. This reduces connector cost and complexity. The device includes a current mode PWM controller, 260mA power switch, and high performance Schottky rectifier. The LED driver eliminates external compensation components for minimum solution size. The wide input voltage range and low standby current are ideal for portable devices. The high input voltage allows direct connection to multi-cell battery packs which increases operating efficiency and extends battery life. Output current is programmed with an external sense resistor up to 100mA (Boost) or 200mA (Buck). The device provides ±5% constant current accuracy across the entire operating temperature range. A logic level PWM dimming signal may be applied directly to the enable (EN) pin - for direct PWM dimming with a wide dimming range. Output OVP (over voltage protec- tion) protects the SC4541 from open circuit faults in the LED string or connector. External OVP programming resistors are not required. The SC4541 is available in low profile MLPD-UT and SOT23,6-pin packages. The device is rated across the temperature range -40°C to +85°C. Version 1.3 |
Аналогичный номер детали - SC4541 |
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Аналогичное описание - SC4541 |
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