The LTC3783EFE#PBF is a current mode LED driver and boost flyback and SEPIC Controller 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 provides extremely fast, true PWM load switching with no transient over-voltage or under-voltage issues, LED dimming ratios of 3000:1 can be achieved digitally, avoiding the colour shift normally associated with LED current dimming. The FBP pin allows analogue dimming of load current, further increasing the effective dimming ratio by 100:1 over PWM alone. In applications where output load current must be returned to VIN, optional constant current/constant voltage regulation controls either output current or output voltage and provides a limit for the other.
- Fully integrated load FET driver for PWM dimming control of high power LEDs
- Constant current or constant voltage regulation
- Programmable operating frequency with one external resistor
- Synchronizable to an external clock up to 1.3 x fOSC
- Internal 7V low dropout voltage regulator
- Programmable output over-voltage protection
- Programmable soft-start
- Can be used in a No RSENSE? Mode for VDS <36V
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