High Effi ciency Integrated Driver
SC440
High Efficiency Integrated Driver for 6-Strings of 30mA LEDs
POWER MANAGEMENT Features
Wide input range 4.5V to 21...
Description
SC440
High Efficiency Integrated Driver for 6-Strings of 30mA LEDs
POWER MANAGEMENT Features
Wide input range 4.5V to 21V 36V maximum output voltage with adjustable OVP for smaller output capacitor Drives up to 60 WLEDs in 6 strings Programmable WLED current for up to 30mA per string 1% string-to-string current matching www.DataSheet4U.com 2.5A integrated power switch Up to 91% efficiency 0.2% to 100% PWM dimming Analog dimming 800KHz switching frequency for small external component Open/short LED protection Short LED protection disable <1uA shut-down current Thermal protection 4mm x 4mm x1mm MLPQ-24 package (WEEE & RoHS compliant)
Description
The SC440 is a high-efficiency multiple string WLED driver with an integrated boost converter. It operates over a wide input range from 4.5V to 21V with a maximum output voltage of 36V and a 2.5A internal power switch. It can drive up to 36V output voltage in 6 strings with current up to 30mA per string. The string-to-string current matching is 1% typical, 3% maximum and 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: 1. The 800kHz switching frequency enables the user to optimize the external component sizes for high efficiency. When there are fewer LEDs in each string, users can use a lower output voltage protection level which yields an allowable reduction in associated costs, size...
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