LT3491EDC#TRMPBF

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The LT3491EDC#TRMPBF is a versatile LED driver from Linear Technology\'s family of LED drivers and is part of the Parametric Multi-Channel Integration Circuit (PMIC), offered by the company. Designed for applications such as general illumination, industrial and medical lighting, the LT3491EDC#TRMPBF is a high efficiency boost regulator specifically designed for driving LEDs. It also provides an adjustable output voltage and over-temperature protection.

The LT3491EDC#TRMPBF is a very efficient part that can drive up to 36 LEDs in series. The device is composed of an integrated N-Channel MOSFET power switch, a high voltage current source and a PWM control architecture. It includes a low quiescent current current-mode boost switching regulator with a zero voltage switching (ZVS) variable frequency, fixed off-time controller. The LT3491EDC#TRMPBF also integrates a unique auto-restart feature that ensures system stability and safety.

The LT3491EDC#TRMPBF has a wide range of adjustable output voltages from 6 to 40V and can support up to 3A of current. The device also offers excellent dimming capabilities with leading edge, trailing edge, and analog dimming. With its wide dimming range, the LT3491EDC#TRMPBF can be used for a variety of applications such as intelligent lighting systems, lighting displays, and low power LED applications.

The device has an integrated thermal protection that shutdowns the LED driver when the junction temperature exceeds 140°C. The LT3491EDC#TRMPBF also offers a built-in soft-start feature that prevents the LED driver from starting up with a large inrush current, thereby protecting the LED against overcurrent. Additionally, the device has an input undervoltage lockout (UVLO) that ensures that the LED driver only operates within a certain voltage range.

The LT3491EDC#TRMPBF utilizes a synchronous buck-boost converter architecture with a current-mode, variable frequency, fixed off-time controller. In this topology, the MOSFET switch is quickly turned on and off at the switching frequency, allowing for high efficiency and zero voltage switching of the LED. The LED current is maintained constant by the current source controlled by the off-time, which is determined by the current-sense comparator, the switching frequency and the inductor value.

The LT3491EDC#TRMPBF is available in a 6 by 8-mm PQFN package, making it ideal for a variety of LED lighting applications. With its wide dimming capabilities and excellent efficiency, the device is a reliable, high performance LED driver solution.

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