High Efciency Integrated Driver For 4-Strings Of 150mA LEDs

The SC44A is a high-efciency multiple string WLED driv- er with an integrated boost converter. It operates over a wide input range from 4.5V to 2V with a maximum out- put voltage of 36V and a 2.5A 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 efciency 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 efciency. 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. By Semtech Corporation
SC441A 's PackagesSC441A 's pdf datasheet

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SC441A Application circuits
SC441A circuits
This is one application circuit of SC441A,If you need more circuits,please download SC441A's pdf datasheet.

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