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SC441DEVB 数据表(PDF) 1 Page - Semtech Corporation |
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SC441DEVB 数据表(HTML) 1 Page - Semtech Corporation |
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1 / 21 page  High Efficiency Integrated Driver for 4-Strings of 150mA LEDs SC441D POWER MANAGEMENT Revision 2.0 Features Wide input voltage range from 4.5V to 27V 42V maximum output voltage Drives up to 40 WLEDs in 4 strings Programmable LED current for up to 150mA per string +/- 2% string-to-string current matching Up to 90% efficiency Wide 0.2% to 00% PWM dimming range Possible analog dimming Integrated 3.0A power switch 700KHz switching frequency for small size Adjustable OVP for cost-effective output cap selection Open/short LED protection Short LED protection disable Thermal protection with auto-recovery Thermally enhanced TSSOP-20 EDP package Lead-free, Halogen-Free and WeEE/RoHS Compliant Description The SC44D is a high-efficiency multiple string WLED driv- er with an integrated boost converter. It operates over a wide input range from 4.5V to 27V with a maximum out- put voltage of 42V and a 3.0A internal power switch. It can drive up to forty WLEDs in 4 strings with current up to 50mA per string. The string-to-string current match- ing is 2% typical, 3% maximum. The overall efficiency is greater than 90% due to the low current sense voltage and a low-impedance internal power switch. The wide PWM dimming range boasts a ratio of 500: . The 700KHz switching frequency enables the user to op- timize the external component sizes for efficiency. When there are fewer than 0 LEDs in each string, users can ad- just the output voltage protection yielding an allowable reduction in associated costs, size and voltage ratings of the output capacitor. The SC44D also features comprehensive open and short-circuit LED protection functions. It disables the cor- responding strings with LED open or LED short conditions while maintaining normal operation of other, unaffected LED strings. This feature allows LCD panels to remain view- able even under LED failure, wire disconnect, or short-cir- cuit conditions. The internal thermal shutdown protects the IC from overheating at abnormal conditions. The SC44D is available in a thermally-enhanced TSSOP- 20 EDP package. Typical Application Circuit 1 4 VOUT SS PGND IOSET IO1-4 COMP OVPIN AGND VIN SW PWM EN SW FFLAG PGND IOGND SC441D 4 Strings 1 12 Vin (4.5V -27V) 2 EDP PGND IOSET IO1- 4 COMP SS AGND VOUT OVPIN SCP_EN Applications Medium-sized LCD panel Notebook Display Automotive Car Navigation Display Sub-Notebook and Tablet Computer Displays Portable Media Players |
类似零件编号 - SC441DEVB |
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类似说明 - SC441DEVB |
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