LT3518HUF#PBF

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LT3518HUF#PBF Application Field and Working Principle

The LT3518HUF#PBF is an integrated circuit for constant current LED drivers with an integrated PWM controller. Designed for lighting applications, the LT3518HUF#PBF is able to deliver constant current over the entire input voltage or temperature range. The device is available in a tiny 6-pin SOT-23-6 surface mount package and is designed to provide a high performance solution for applications requiring a low cost, small form factor LED driver with a built-in PWM controller.

Features and Benefits

The LT3518HUF#PBF features a number of features and benefits that make it an ideal choice for a wide variety of LED driver applications. For starters, the device offers a constant current capability over the full operating temperature range, eliminating the need for temperature compensation. In addition, the device offers a wide input voltage range, from 3V to 30V, allowing it to be used in a wide variety of lighting designs. The device also features an adjustable dimming range, from 0V to 100%, and can be used with PWM, analog dimming and digital dimming methods for controlling LED brightness.

In addition to its wide input voltage range, the LT3518HUF#PBF supports both active and passive PWM dimming. The device offers a programmable PWM frequency range of up to 400kHz and is capable of driving up to 20 LEDs in series. The device also includes current sense circuitry and thermal protection, further enhancing its overall system level performance and reliability.

Applications

The LT3518HUF#PBF is ideal for a wide range of LED lighting applications. From landscape lighting and indoor and outdoor area lighting, to automotive and commercial lighting, the device’s wide input voltage range and constant current delivery make it an excellent choice for a variety of LED lighting solutions. In addition, the device is well suited for use in other LED applications, such as LED displays and LED signage.

Working Principle

At the heart of the LT3518HUF#PBF is an integrated buck switching regulator circuit, capable of delivering a constant current to the LED string. The device is designed to control its output current through an external resistor, allowing for a wide range of adjustment. The device also features a programmable PWM frequency, enabling it to be used with either analog or digital dimming approaches. The device’s output is monitored through an integrated current sense circuit, allowing it to be shut down in the event of an over-current or over-temperature condition. Finally, the device includes a number of additional safety features, such as UVLO, underdrain sense and over-temperature protection, helping to ensure a safe and reliable operation.

Conclusion

The LT3518HUF#PBF is a highly integrated LED driver IC, able to deliver a constant current over a wide input voltage and temperature range. Featuring an integrated PWM controller, the device is ideal for a wide range of LED lighting applications, from landscape lighting and indoor and outdoor area lighting, to automotive and commercial lighting. In addition, the device’s programmable PWM frequency, current sense circuitry and over-temperature protection make it a highly reliable and capable solution for LED lighting designs.

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