AS3661-EB

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Evaluation Boards - LED Drivers has become an increasingly popular device for lighting its surroundings in a variety of applications. The AS3661-EB is a great example of a dynamic LED constant current driver that sets the standard for applications like message boards, street lamps, and color changing lights. This evaluation board provides a detailed documentation of the working principle and application field of the AS3661-EB.

The AS3661-EB is an LED driver for linear, constant current operation with a wide input voltage range. It is especially suited for LED applications requiring uses of multiple LED strings down to only one LED string with a minimum of external components. This evaluation board further provides a great overview of the AS3661-EB by offering a topology and demonstration of the dynamic LED constant current feature.

The AS3661-EB works on the principle of a peak current controller and a pulse width modulator, PWM. When enabled, it starts a cycle where it continuously adjusts the duty cycle of the PWM to ensure the output current remains a precise linear value to the LEDs. Apart from offering dynamic current control, the AS3661-EB protects against overcurrent and open-circuit conditions.

The working principle of the AS3661-EB design begins with an N-channel power MOSFET, aka. an intelligent power switch connected at the output. This switch and the external capacitor compose a peak current control loop that detects the peak current and keeps it at a constant value, this is done by periodically conducting for the current source a voltage measurement linked to the detection of the power MOSFET’s peak current. The PWM of the device is then adjusted to maintain the LED forward voltage during periods of LED operation at less than the device\'s maximum forward current.

The AS3661-EB enables multiple LED strings to be connected in series and/or parallel to control single/multi color LEDs. This path is usually taken when designing a system with a minimum number of external components and a maximum number of LEDs. The AS3661-EB also has many useful features including soft-start, thermal protection, input current limit, open circuit detection, and logic level shifters.

Since this is an evaluation board for the AS3661-EB, it also has some features that allow for the easiest use of the AS3661-EB. These features include basic circuitry set-up, a programmable push button, single/multi-color LED control, LEDs and MOSFETs mounted on the board, external components for quick connections and voltage measurement, an adjustable voltage source, a connection for a power supply, and a termina block for an output pin.

In conclusion, the AS3661-EB is a powerful, cost-effective and efficient LED driver board for linear, constant current operations with a wide input voltage range. It is especially suited for multi-string applications, with minimal external components, while offering useful features such as soft-start, thermal protection, input current limit, open circuit detection, and logic level shifters. The evaluation board of the device allows customers to easily test out its features and applications, with components such as a programmable push button, LEDs, MOSFETs, and a voltage source.

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