AS3649-ZWLM

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The AS3649-ZWLM is a Power Management IC (PMIC) used as a high power LED driver, suitable for a wide range of applications. It is an integrated, high performance DC-DC converter solution, with an output of up to 8A and a wide input voltage range of 3V to 37V. It is equipped with an integrated pulse-to-pulse current regulation (I2C) loop and supports multiple dimming functions, such as analog, I2C, and wall dimmers. The AS3649-ZWLM is also pre-programmed with optimized dimming parameters, allowing designers to use the PMIC with minimal engineering effort.

The AS3649-ZWLM is designed with a high efficiency boost converter, as well as an integrated current-mode loop that provides good line and load regulation. The integrated LED current control loop can provide current limiting for LED arrays in multiple applications, such as automotive and indoor lighting.

The AS3649-ZWLM is designed for applications requiring low input voltages, low output current ripple, and wide dimming capability. Its output voltage range of 3V to 37V and load regulation of ± 10% enables it to be used in automotive, industrial, and commercial lighting applications. In addition, the integrated dimming control feature makes it easy to design dimmable lighting systems.

The AS3649-ZWLM has a built-in I2C bus which is used to control the LED current and enable automatic dimming functions. The PMIC is powered by a single-ended 12V power input, and its output can be adjusted via an external potentiometer. In addition, the AS3649-ZWLM also has an integrated thermal protection circuit, over-current protection, and short-circuit protection.

The operation principle of the AS3649-ZWLM is based on a pulse-width modulation (PWM) technique. The duty cycle of the PWM is varied with a reference voltage from the feedback of the current sense amplifier/controller on the output of the PMIC. The PWM duty cycle is modulated so that the LED current is regulated; when the output voltage reaches the regulation set point, the duty cycle will decrease and the LED current will decrease.

The AS3649-ZWLM can be configured for multiple dimming functions, such as analog, I2C, and wall dimmers. It is also pre-programmed with optimized dimming parameters, allowing designers to use the PMIC with minimal engineering effort. The multiple protection features make the AS3649-ZWLM an ideal choice for LED driver applications that require high efficiency, wide dimming capabilities, and high reliability.

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