LT3922HUFD#PBF

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The LT3922HUFD#PBF is an LED driver intergrated circuit from Linear Technology. It is a high current buck-boost switching controller that can deliver up to 10 A of peak current for driving high-power LEDs. It features an exceptionally wide input voltage range (2.5 V - 24 V) and a single programmable output voltage, allowing for regulating output current without the need for an external voltage divider.

The LT3922HUFD#PBF is classified as a PMIC (Power Management Integrated Circuit) and falls under the LED Drivers category due to its ability to provide constant current to LEDs in high-power applications. The LT3922HUFD#PBF uses a proprietary buck-boost architecture that is optimized for driving LEDs while providing high efficiency, fast transient response, low noise, and compact discrete components.

The LT3922HUFD#PBF features a serial interface for programming the output current, and a unique fault protection circuit that can detect open or shorted LEDs and initiate a safe shutdown. The device takes advantage of its wide input voltage range to optimize the efficiency and reduce the external components needed by automatically switching between buck and boost the mode when varying the load and voltage. The device is designed to meet the requirements of lighting applications, with a low output noise and constant current over a wide dimming range.

The working principle of the LT3922HUFD#PBF is based on the buck-boost switching topology in which the output voltage is regulated by controlling the duty cycle of the switching element, usually a MOSFET. The device first compares the programmed LED current with the output current in order to adjust the duty cycle. The output current is then regulated to match the programmed LED current which provides a constant output current while regulating the output voltage.

The LT3922HUFD#PBF is an ideal device for applications that require a high current LED driver with versatile input voltage range. The compact design, wide input range and unique features such as fast current programming, superior efficiency and constant current regulation, make it a great choice for LED lighting, automotive and industrial applications.

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