LTC3783EFE#TRPBF

LTC3783 is a current mode LED driver and boost, flyback and SEPIC controller that drives both an N-channel power MOSFET and an N-channel load PWM switch. When using an external load switch, the PWMIN input not only drives PWMOUT, but also enables controller GATE switching and error amplifier operation, allowing the controller to store load current information while PWMIN is low. This feature (patent pending) provides extremely fast, true PWM load switching with no transient overvoltage or undervoltage issues, LED dimming ratios of 3000:1 can be achieved digitally, avoiding the colour shift normally associated with LED current dimming. For low- to medium-power applications, no RSENSE mode can utilize the power MOSFET’s on-resistance to eliminate the current-sense resistor, thereby maximizing efficiency. Applications include high voltage LED arrays, telecom power supplies, 42V automotive systems, 24V industrial controls, IP phone power supplies.

• True colour PWM™ delivers constant colour with 3000:1 dimming ratio
• Fully integrated load FET driver for PWM dimming control of high power LEDs
• 100:1 dimming from analogue inputs, wide FB voltage range from 0V to 1.23V
• 1% 1.23V internal voltage reference, 2% RUN pin threshold with 100mV hysteresis
• Programmable operating frequency (20KHz to 1MHz) with one external resistor
• Synchronizable to an external clock up to 1.3fOSC
• Internal 7V low dropout voltage regulator, programmable output overvoltage protection
• Programmable soft-start
• Can be used in a no RSENSE™ mode for VDS <lt/> 36V
• 16-lead plastic TSSOP package, -40°C to 85°C temperature range

บันทึก

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