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PMIC - LED Drivers

The LT3965IFE-1#PBF is a current controller PMIC designed for LED lighting and display applications. This device is employed to regulate the brightness of LED devices by modulating the voltage or current supplied to the LED load. The LT3965IFE-1#PBF is composed of a constant current source (CCS) and light emitting diode (LED) dimming circuitry. The current source works by driving the LED to maintain a constant current regardless of the voltage, thus providing a stable light output for the LEDs. The LED dimming circuitry is integrated with the CCS to provide a controlled brightness level for the LEDs when the input voltage is varied. The LT3965IFE-1#PBF also provides short-circuit and thermal protection for the LEDs, which ensures a safe and reliable operation.

Application Field

The LT3965IFE-1#PBF PMIC is primarily used as an LED driver in applications such as backlighting, signage, and lighting applications. Its wide range of features can make it suitable for a variety of applications including RGB, low voltage, and high power lighting. It is also suitable for automotive, medical, industrial, and consumer lighting applications. The LT3965IFE-1#PBF is designed to work with selectable current settings, allowing the user to easily adjust the brightness of the LEDs. The device is also capable of driving up to six strings of LEDs with a single device, allowing for increased flexibility and decreased power consumption.

Working Principle

The LT3965IFE-1#PBF is composed of a CCS and LED dimming circuitry. The CCS monitors the LED load and supplies a constant current to the LED regardless of the input voltage. The LED dimming circuitry is used to provide a controlled brightness level for the LEDs. The LT3965IFE-1#PBF has two onboard regulators which is used to generate a controlled voltage and current to drive the LEDs. The device also features two frequency control pins (F1 and F2), which can be used to adjust the frequency of the output current.

The frequency control pins are also used to determine the brightness of the LEDs. The LT3965IFE-1#PBF also supports adaptive dimming which adjusts the brightness level automatically based on the input voltage. The device also supports active droop which allows for a more uniform current distribution among the LEDs in the system. This ensures that the LEDs remain evenly lit at all times. Additionally, the LT3965IFE-1#PBF also supports dim-to-off, allowing the LEDs to be dimmed to a minimum brightness level without the need for a discrete low dropout regulator.

The LT3965IFE-1#PBF is designed to provide protection against thermal overload and short circuits, protecting the LEDs from damage. Additionally, the device also features a current monitor output pin (CM) which can be used to measure the LED current, allowing the user to verify that the LED is operating correctly. The LT3965IFE-1#PBF also features a power fail detection (PFD) pin, which can be used to detect an overvoltage condition or an undervoltage condition that could cause damage to the LEDs.

Conclusion

The LT3965IFE-1#PBF PMIC is an ideal LED driver for a variety of applications including RGB, low voltage, and high power lighting. Its unique features make it well suited for automotive, medical, industrial, and consumer lighting applications. With a wide range of settings and protection from short circuits and thermal overload, the LT3965IFE-1#PBF provides a reliable and efficient solution for LED lighting applications.

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