LT3475EFE#PBF

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PMIC - LED Drivers incorporate drivers with current regulation or constant-current drivers, which provide power solutions for driving LED arrays. The LT3475EFE#PBF is an example of such drivers, with a wide range of features suitable for driving multiple LED chains, allowing for display solutions that offer higher brightness, durability and flexibility. In this article, we will discuss the application field and working principle of the LT3475EFE#PBF.

The LT3475EFE#PBF from Linear Technology Corporation is an LED driver specifically designed to provide constant-current solutions for driving LED strips. The LT3475EFE#PBF is a power supply IC with a wide operating input voltage range, from 2.5V to 50V, making it suitable for applications such as automotive and displays. Its constant-current output current range is from 0.3mA to 1A, which can be programmed with a single resistor. The IC also integrates many features such as a power good output, wide range current sense and feedback loop, overvoltage protection, overcurrent protection, and an adjustable flip-back timmer. The power stage implemented in the IC consists of a 2-phase buck resistor-capacitor (RC) filter, allowing for a wide range of frequencies for driving the LED array. Finally, the IC also offers a number of shutdown and control features such as over-temperature protection and short-circuit protection.

The LT3475EFE#PBF application field mainly consists of automotive and display-related projects. The IC\'s wide input voltage range makes it suitable for applications that require higher efficiency and power savings, such as automotive displays. The IC also provides wide range current sense and feedback loop, allowing for proper current regulation and dimming control. The adjustable flip-back timer is also especially useful for automotive applications, in order to reset the IC after a soft start. In addition, the integrated protection features such as over-temperature protection, overload protection, and short-circuit protection ensure the safety of the circuit and the projector in a variety of extreme situations.

The working principle of the LT3475EFE#PBF is based on a 2-phase buck-boost constant-current driver. The power stage consists of a 2-phase buck RC filter, which is used to control the output current to the LED array. The IC’s control loop uses an adjustable feedback loop, coupled with a wide-range current sense resistor, to sense the output current and regulate it. The IC also features an adjustable flip-back timer, which is used to reset the IC after a soft start. Finally, the IC features a number of protection features, such as over-temperature protection, overcurrent protection, short-circuit protection, and an adjustable flip-back timer.

In conclusion, the LT3475EFE#PBF is an LED driver IC that provides a wide range of features suitable for driving multiple LED chains. Its wide range of operating voltages makes it suitable for automotive and display applications, while its constant-current output current range and adjustable feedback loop provide adjustable current regulation. The integrated protection features ensure the safety of the circuit, while the adjustable flip-back timer enables resetting of the IC after a soft start.

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