LT3954EUHE

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The LT3954EUHE is an advanced dimming power-management IC with built-in scalability from 2.5V to 48V, making it suitable for a range of applications. It is a Switched Mode Regulator (SMR) and Pulse-Width Modulation (PWM) chip with common-mode voltage feedback, and is capable of simultaneous high-side and low-side dimming for single- or multiple-output applications. It provides a flexible, high-efficiency LED driver solution with both LED side and power side dimming.

This chip is an ideal solution for LED applications, offering superior performance, improved power savings, and higher efficiency in a tiny footprint. It supports voltages from 2.5V to 48V, and the dimming ratio is up to 0 to 100%. It also supports up to 6.25A peak drive current and 4A average drive current.

The LT3954EUHE is comprised of 3 separate stages of power conversion: the voltage regulator stage, the dimmer stage, and the current monitor stage. The first stage is the voltage regulator, which provides the power supply to the device by converting the input voltage. The dimmer stage is used to modify the voltage output by changing its pulses over time, thus regulating the current to the LED. Finally, the current monitor stage is used to measure the current passing through the circuit and provide short-circuit protection.

The LT3954EUHE supports both LED side dimming and power side dimming modes. The LED side dimming operates the LED’s PWM signal along with the device’s PWM dimmer current regulation to adjust the LED’s light output. The LED side dimming mode allows for accurate LED current regulation and improved LED output efficiency. The power side dimming uses the dimming pin of the LT3954EUHE to adjust its reference voltage, thus regulating the LED current. This mode has less complexity compared to LED side dimming but has the disadvantage of reduced LED efficiency.

In addition to having the ability to dim LED signals, the LT3954EUHE also provides certain convenience features such as adjustable switching frequency, overvoltage protection, cycle-by-cycle current limit, open-loop detection, and short-circuit protection. It also offers low-noise operation, minimal EMI, and current-mode control with fast transient response.

The LT3954EUHE is suitable for automotive, medical, industrial, and consumer applications. It can be used to build LED driver designs such as reverse voltage protection, energy saving, dimming, and power monitor smart lighting system. It is also applicable in the field of LED display, displays, lighting, security cameras, and other industrial equipment.

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