LT3964EUHE#PBF

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PMIC - LED Drivers have become increasingly important as the demand for LED lighting products has grown in the last decade. The LT3964EUHE#PBF is a high-efficiency multi-string LED driver that provides the necessary regulation, control and flexibility for a wide range of LED lighting applications. This device is ideal for use in LED lighting products that require the worry-free operation, high efficiency and flexibility.

Features

The LT3964EUHE#PBF features a high efficiency of up to 97%, an integrated buck regulator with a wide switching frequency range, selectable constant current levels, and an adjustable on-time for the buck switch. It also includes a load impedance detection feature, an adjustable over-current protection, and a thermal pad for improved thermal performance. Additionally, it provides a boost driver with individually selectable switch voltage, overload protection and a thermal pad for improved thermal performance. The device also offers I2C or PWM dimming control, over-temperature protection and overtemperature shutdown.

Applications

The LT3964EUHE#PBF is suitable for a variety of LED lighting applications such as street lighting, high-bay lighting, integrated troffers, down lights, and spotlights. Additionally, its high efficiency and multiple string capability make it ideal for off-grid and arctic applications, such as solar-powered street lamps, industrial applications and outdoor uses. Furthermore, the wide switching frequency range and adjustable on-time enables operations with high efficacy PWM dimmers and enables the capability for high speed PWM control for adjustable brightness control.

Working Principle

The LT3964EUHE#PBF is a multi-string LED driver with a wide switching frequency range, selectable constant current levels, and adjustable on-time for the buck switch. It features a buck regulator with integrated load detection, overload protection, and adjustable on-time for the buck switch. The buck regulator operates in continuous conduction mode, meaning that there is always a continuous current flow through the output inductor. The buck regulator operates by switching an integrated MOSFET at a frequency of up to 500kHz, depending on the output current. This causes energy to be stored in the output inductor, which is then released into the output capacitor, resulting in a regulated output voltage.

The boost controller operates in discontinuous conduction mode, meaning that it only switches when the current through the output inductor falls below a certain level. The boost controller operates by switching the integrated MOSFET at a frequency of up to 400kHz, depending on the output current. This causes energy to be stored in the output inductor, which is then released into the output capacitor, resulting in a regulated output voltage. The device also includes a dimming control input, which allows for individual strings to either be simultaneously dimmed or independently dimmed, depending on the application.

The LT3964EUHE#PBF also integrates various safety features, such over temperature protection, overload protection and thermal shut-down. These features ensure the LED string is safe and reliable in various temperature and working conditions.

Conclusion

The LT3964EUHE#PBF is an ideal LED driver for a variety of LED lighting applications. It offers a wide switching frequency range, adjustable on-time for the buck switch, built-in overload protection, and adjustable current levels. Furthermore, the device is capable of dimming with either I2C or PWM control and provides safety features such as over-temperature protection and thermal shut-down. With its high efficiency and multi-string capability, the LT3964EUHE#PBF is an ideal LED driver for a wide range of LED lighting applications.

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