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Allegromicro 高效白光LED驱动方案

消耗积分:5 | 格式:rar | 大小:1110 | 2010-12-21

吴湛

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Features and Benefits
• Wide input voltage range: 5 to 40 V
• Maximum LED current of 120 mA
• TSSOP-16 (LP) package; exposed pad offers best-in-class
thermal performance
• Typical LED accuracy of 0.5%, and 0.5% for
LED-to-LED matching
• Internal bias supply for single-supply operation (typically
between VIN = 8 to 24 V)
• Integrated boost converter with 60 V DMOS switch with
overvoltage protection (OVP)
• Drives up to 12 series LEDs in 2 parallel strings
• Single PWM pin interface for both PWM dimming
and enable function
• Sync function to synchronize boost converter switching
frequencies up to 2.25 MHz, this gives the designer the
ability minimize component size
• Provides driver for external PMOS input disconnect switch
• Protection features:
▫ Open or shorted VLED pin protection
▫ Open Schottky protection
▫ Cycle-by-cycle current limit
▫ Overtemperature protection (OTP)
▫ Output short circuit protection

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