LT3756EMSE-1#PBF

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LT3756EMSE-1#PBF is a PMIC - LED Drivers that dedicated for LED driving in LED backlighting application and LED lighting application. It is designed to drive multiple sizes of LED backlight and LED lighting without any external sense resistor, allowing low cost and smaller PCB design. With its excellent features and functions, the LT3756EMSE-1#PBF provides accurate output current, to drive up to 20 LEDs (or equivalent to 120 Watt in total) in an ideal configuration. It is suitable for LED applications with multiple LED strings, and the design of the LED driver requires just one external component: an external sense-FET that offers up to 1A or greater load current.

The LT3756EMSE-1#PBF is built with an auto-start logic circuit, which enables the device to start up and power up the external load during installation or power-on reset. This device also contains intelligent functions such as short-circuit protection, overtemperature protection, over-voltage protection, undervoltage lockout protection, and output current soft-start. Besides the IC’s robust protection functions, it is also capable to program the output current for dimming the LEDs. Therefore, it is suitable for applications that require dimming capabilities.

The working principle of the LT3756EMSE-1#PBF is based on an external sense-FET, which acts as a voltage or current switch to control the external load. The external sense-FET connects to the Vout, Vin and GND pins. The switch is turned-on when Vin and Vout are at the same level. To maintain a constant current, the voltage on the sense-FET switches is controlled by the LT3756EMSE-1#PBF. The output current is adjusted according to the voltage drop across the sense-FET by means of an internal current sense circuit. The device detects the voltage drop on the sense-FET when the external load is connected and supplies the proper current regulation.

The LT3756EMSE-1#PBF also contains a fault detection including open-short-circuit detection and over-temperature protection circuit. The over-temperature protection circuit turns off the IC internally when the IC temperature exceeds the over-temperature protection threshold. The short-circuit protection circuit limits the output current with the external sense-FET voltage and the open circuit protection circuit monitors the on/off state of the external load.

In summary, the LT3756EMSE-1#PBF is an efficient PMIC - LED Drivers, which is dedicated for LED driving in LED backlighting application and LED lighting application. It is designed to drive multiple sizes of LED backlight and LED lighting without any external sense resistor and already provides protection functions. With the auto-start logic circuit and the intelligent functions, it is suitable for applications that require dimming capabilities.

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