LT3797EUKG#TRPBF

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PMIC - LED Drivers are components used to power Light-Emitting Diodes (LEDs). The LT3797EUKG#TRPBF is a high-efficiency constant current LED driver which integrates a high-speed current-mode converter with secondary side feedback control. This device was designed with an input voltage range from 8V to 42V and is designed to provide up to 1.5A of regulated output current with excellent lighting current accuracy over temperature and process corners.

The LT3797EUKG#TRPBF contains two independent LED current sources operating in synchronism with a third current sink. The two LED current sources are configured as synchronous buck DC-DC converters with programmable output voltage or current set points. The third current sink is a current controlled NMOS totem-pole that sinks current when both LED current sources are swinging their output voltage towards each other.

The LT3797EUKG#TRPBF\'s support features make it suitable for many applications. It supports wide dimming range, wide range of light levels, and efficiency boost capability. It offers adjustable minimum and maximum output current setting, enabling bright-to-dim as well as dim-to-off dimming capability. Other features include adjustable dead time control, external PWM dimming, an internal oscillator, and an active-high open loop EN signal to turn the device on and off. Additionally, a selectable programmable slope allows for dimming from 1% to 100% with no flickering and the ability to control brightness through output voltage or current.

The LT3797EUKG#TRPBF\'s working principle allows for precise regulation of the output current at its regulated set point value regardless of load and input voltage variations. The internal current-mode control loop is triggered whenever the difference between the output current and a reference current rises above a certain threshold. This triggers the current source/sink to adjust the output voltage so that the output current eventually comes close to the reference value. This active control of the output current ensures that the LED current output remains accurate over a wide range of operating conditions and ambient temperatures.

The LT3797EUKG#TRPBF\'s precise output current regulation and adjustable PWM dimming make it an ideal device for use in automotive, automotive LED lighting, LED signage, LED display, and LED marquees. It is also suitable for LED intensity adaptive lighting, LED screen and LED displays applications. Additionally, this device can be used to drive multiple series-connected LEDs, with adjustable current/power ratio in each LED string.

In summary, the LT3797EUKG#TRPBF is a high-efficiency current mode LED driver with an input voltage range from 8V to 42V. It offers precise output current regulation, adjustable minimum and maximum output current setting, adjustable dead time control, active-high open loop EN signal to turn the device on and off, external PWM dimming, and an internal oscillator. Its wide variety of features and support make it ideal for LED lighting applications in various markets.

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