LM3699EVM

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LEDs are a popular form of illumination and are used in a wide range of applications. The LM3699EVM (Evaluation Module) is an evaluation board designed to facilitate easy implementation of the LM3699 LED driver and demonstrates the device\'s various functions. This article will explore the application field and working principles of the LM3699EVM.

Application Field

The LM3699EVM is suitable for driving both high- and low-power LEDs, such as main power (up to 10W) and auxiliary low-power LEDs (2mA to 6A). One of the main features of this device is its fast and easy LED dimming capability. This is accomplished by PWM dimming, where on-board buck current regulator can be used to dim the LED current from 0.5 mA to 6 A. Additionally, it can efficiently supply power to the LED from 4.5 V to 32 V.

The board also includes an on-board diagnostic circuit which provides feedback about the LED’s health. The diagnostic circuit monitors temperature, current, and open- and short-circuit fault status of the attached LED. This can be used to increase the system\'s reliability by allowing the system to detect any problems related to the LEDs.

The LM3699EVM has two modes of operation: buck mode and boost mode. It is designed to be easy to use and can be powered directly from any power rail that is greater than the input voltage range.

Working Principle

The LM3699EVM is an evaluation module that uses the LM3699. It implements a buck regulator which accepts a voltage between 4.5V to 32V and regulates the output voltage between 0.5V to 95V. The LM3699EVM allows a user to easily dim an LED by applying a constant-frequency PWM signal to the DIM pin. The DIM pin is tied to an internal voltage divider in order to set the percentage of maximum current the LED will consume.

The LM3699EVM also includes an on-board diagnostic circuit. This circuit allows the user to monitor the open- and short-circuit faults, temperature, and current of the LED. This can be used to protect the LED from any potentially damaging faults, such as over-current or over-temperature.

The board can also be configured for buck-boost mode, which allows it to regulate an output voltage even if the input voltage is lower than the output voltage. This is accomplished by combining the buck and boost topology into a single integrated circuit. This mode is often used in systems that use two or more cells instead of one.

In summary, the LM3699EVM is a versatile evaluation board that allows for fast and easy implementation of the LM3699 LED driver. It is capable of driving both high- and low-power LEDs, and includes an on-board diagnostic circuit for monitoring faults and temperature. Additionally, the board can be configured for buck-boost operation for applications that require a regulated output voltage even when the input voltage is lower than the output voltage.

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