LT3791EFE#TRPBF

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A power management IC (PMIC), such as the LT3791EFE#TRPBF, offers a wide set of features for monitoring, controlling, and managing power for various applications, such as LED drivers. It provides integrated over-voltage protection and current monitoring for LEDs, as well as a variety of features to provide accurate, safe, and energy-efficient power solutions for LED applications. This article will discuss the application field and working principle of the LT3791EFE #TRPBF.

Application Field

The LT3791EFE#TRPBF is a monolithic constant current regulator designed for driving high current LEDs. It employs a ground-referenced, current side feedback architecture with integrated driver FETs and power transistors to provide superior performance in LED applications. It is suitable for use with wide input voltage sources, up to 40 V, and can drive LEDs up to a total current of 25 A. The device also features adjustable slew rate control, allowing users to select fast, medium, or slow current transitions and can be used with power supplies ranging from 4.5 V to 40 V.

The LT3791EFE#TRPBF can be used with multiple LED strings in series or in parallel, with each channel operating independently while being monitored for current and temperature. It features a highly accurate current sink that can provide a stable and consistent LED current at up to 2-3% accuracy. The device also offers several protections for LED fault conditions, such as LED over-current, LED open/short, LED over-temperature, LED under-voltage, and LED over-voltage protection.

The LT3791EFE#TRPBF can also be used to drive RGB LEDs in RGB LED applications, providing up to 25 A per string to power all three color channels simultaneously. It supports a wide range of color temperatures and enables adjustable PWM dimming to provide smooth and consistent dimming over a wide range. The device also features a high 100 KHz output frequency that allows faster color control and higher efficiency, as well as user-adjustable slew rate control to further optimize dimming performance.

Working Principle

The LT3791EFE#TRPBF employs a ground-referenced, current side feedback architecture. This allows the device to maintain a constant current to the LEDs, even when the input voltage fluctuates or varies. The device operates by sensing the voltage across a current sense resistor connected to its output node. This voltage is proportional to the LED string current, and the device measures this voltage and compares it to the user-programmed LED current set point. The device then adjusts the gate voltage of the driver FETs, in order to adjust the LED string current until the desired set point is achieved.

The LT3791EFE#TRPBF also incorporates several protections for LED fault conditions. The device monitors the LED string current and can shut off the power if the current exceeds the user-programmed fault threshold. It also monitors the LED temperature and can shut off the power if the temperature exceeds a user-programmed safe limit. Additionally, the device can detect if the LED string voltage is too low, too high, or shorts, and will shut off power to protect the LEDs from these fault conditions.

The LT3791EFE#TRPBF provides a number of features to ensure energy-efficient power solutions for LED applications. It offers a highly accurate current sink, programmable slew rate control for fast or slow current transitions, adjustable PWM dimming for RGB LEDs, and integrated protections for various fault conditions. Additionally, the device is suitable for use with wide input voltage sources and can power multiple LED strings simultaneously, making it an ideal solution for high-power LED designs.

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