LM3697YFQR Integrated Circuits (ICs)

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LED (Light Emitting Diode) have become increasingly popular due to their great life time, energy-saving features, and flexibility with regards to brightness control. LM3697YFQR is a driver for small, bright LEDs that provide efficient power management for brightness control in various applications. This article explains the application fields and working principle of LM3697YFQR.

Applications

LM3697YFQR is designed primarily for small portable devices that require LCD backlighting or individual LEDs as display elements as well as requiring low power or are battery operated. It can be used in smart phones, digital cameras, PDAs, remotes, keyboards, and other portable applications. Other applications include small displays and indicators, diagnostic displays, gaming controllers, multitouch displays and signage displays.

LEDs are often used to display information, provide feedback, or indicate status. For this, many drivers require a contact pin or telephone line to set the proper brightness or intensity. LM3697YFQR solves this problem with its integrated controllers which use feedback to adjust the brightness or intensity of the LEDs without external input. This simplifies the manufacturing process and provides an energy efficient solution.

Features

One of the key features of LM3697YFQR is its low power consumption. It requires only 1uA static current, which is much less than other LED drivers. As a result, it can be used in battery operated applications and still offer the same level of performance.

LM3697YFQR is capable of driving up to 32 LEDs in series and 20 LEDs in parallel with a total LED current of 1A. It only needs an input voltage of 3V and offers a switching frequency of 500kHz, which allows for a wide range of LED brightness control. LM3697YFQR also has two independent phase dimming channels, which allows lighting designers to create unique lighting effects.

In addition, LM3697YFQR has several built-in safety features such as open circuit protection, reverse current protection, and over-temperature protection. This makes it suitable for use in industrial applications where safety is critical. It also offers low EMI vibration and noise for noise sensitive applications.

Working Principle

LM3697YFQR is a monolithic integrated phase-dimming LED driver which works by switching a series or parallel of LEDs. It contains two internal controllers which allow for efficient phase dimming of LEDs. The first controller is a PWM (Pulse Width Modulation) controller that drives the current in the LEDs. The second controller provides feedback to adjust the LED brightness or intensity. This feedback is used by the controller to adjust the duty cycle of the LED, thus controlling the LED brightness or intensity.

The LM3697YFQR is designed for high efficiency, this is achieved by using synchronous rectification where the switching MOSFETs switch the drain current off sooner than the source current, thus reducing losses from the MOSFET on-state resistance. This helps reduce power consumption by switching off the LEDs more efficiently without any hardship.

In addition, the LM3697YFQR driver has an integrated boost converter that boosts the input voltage to the LED level. This ensures that the LED is at the correct voltage level and is compatible with the LED\'s forward voltage requirement. This further reduces power losses and increases efficiency.

Conclusion

LM3697YFQR is an efficient LED driver that is ideal for applications that require low power or are battery operated. It is suitable for use in small, portable devices such as phones, digital cameras and PDAs. It works by controlling the current in the LEDs and has a wide range of features such as low power consumption, efficient phase dimming, and safety features. With its integrated boost converter, the driver is capable of boosting the input voltage to the LED level, thus reducing the power losses and increasing the efficiency of the driver.

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