LT3955IUHE#PBF

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LT3955IUHE#PBF is a highly efficient, wide input voltage and single chip automotive LED lighting driver, which is mainly applied in automotive LED lighting systems. It is designed to efficiently power up to 24 LEDs in constant current / constant voltage mode, typically being used for LED strips, LED headlights, LED stoplights, LED turn lights, LED daisy chain applications and characteristic curves.

LT3955IUHE#PBF belongs to PMIC - LED Drivers, which is a unique technology for controlling, regulating and transforming the power into usable energy. This type of driver is mainly used in different settings including industrial, automotive and consumer electronics. Thanks to its versatile design, PMIC - LED drivers can achieve enhanced efficiency and reliability in the system.

LT3955IUHE#PBF features a wide range of protection functions such as over-voltage protection, over-current protection, LED open/short circuit protection, automatic current/voltage matching, internal soft-start, input reverse-battery protection, output-open circuit protection, thermal shutdown protection, etc. Moreover, it has a current control loop accuracy of plus or minus 3% and a constant current controlled above 95% accuracy. In addition, this driver comes with advanced dimming functions such as digital PWM signal dimming, analog current dimming, an adjustable dead time providing smooth and flicker-free dimming.

The working principle of LT3955IUHE#PBF is relatively simple. In constant current operation, this driver will firstly detect the voltage drop on the sense resistor. Then, it will control the main switch so that the output voltage of the power supply will equal to the voltage drop on the resistor. Through this iteration process, the driver will finally maintain the stable and constant current output. On the other hand, in constant voltage operation, this driver will firstly measure the loads current using an integrated current sense amplifier. Then, it will use the control circuit to adjust the switch duty cycle according to the measured current. Finally, it will reach the steady state voltage.

LT3955IUHE#PBF is the optimal choice for automotive LED lighting applications, since it features high efficiency, great protection functions and versatile dimming functions. Moreover, its constant current/constant voltage operating principle makes it widely applicable for a variety of LED lighting applications.

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