AS3691B-ZQFP

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The AS3691B-ZQFP is a PMIC – LED driver that offers an efficient and robust solution for driving high-power white LED beads, simplifying complex power management. This device is mainly used in smartphones, tablets and other battery-powered equipment, such as backlighting applications. Due to its advanced features, such as low ripple current, fast response, low power consumption and high efficiency, it has become increasingly popular among LED applications, providing important benefits in terms of power and design performance.

The AS3691B-ZQFP can automatically regulate light output and brightness according to the environment and power supply. It can also control the overall brightness, dimming, color temperature, and flicker-free performance due to its digital control loop. The built-in hysteretic comparator and general purpose transistor also enable smooth, PWM dimming control.

The AS3691B-ZQFP has several features that make it suitable for a variety of commercial, industrial, and consumer applications. It has a wide range of input voltage from 6V to 28V, thermally protected high-side and low-side outputs, and a driver for up to 1.5A of sinking current. The low ripple current, low operating noise, and high efficiency make it suitable for use in mobile and portable applications. Furthermore, it is designed with active current and voltage flatness compensation, shrinkable ringer length, and multiple soft- start functions, making it easier to optimize product performance and design.

The working principle of the AS3691B-ZQFP is based on a digital current feedback scheme. The device contains a DC/DC LED driver, an LED current controller, and a linear current sense amplifier. The LED current controller provides a PWM signal and is the main component of the system. The linear amplifier senses and amplifies the LED current and its output is compared against a reference current. The resulting difference will determine the PWM duty cycle and thus control the LED current to achieve the desired level.

The AS3691B-ZQFP also supports both single and multiple LED channels. For applications that need fast turn-on time, the device offers a soft-start function for each channel, with a current step size that the user can configure. Additionally, the device has multiple phase delay modes to help limit the inrush current by controlling the number of LED channels that are turned on each phase up to eight. It also supports open loop operation, meaning it can disable its control loop, allowing the device to operate without feedback.

The AS3691B-ZQFP also supports dimming. It can be set up for any combination of analog dimming and digital dimming, depending on the application. The device supports a 16-bit serial interface compatible with various digital buses, such as USB and I2C. With its digital interface, developers can easily control and program the device. The on-board registers can also be used to configure the device parameters, such as brightness and color temperature.

In summary, the AS3691B-ZQFP PMIC – LED driver is a robust device that offers an efficient solution for driving high-power white LED beads. Its wide range of features, such as low ripple current, fast response, low power consumption and high efficiency make it an ideal choice for a variety of applications, such as smartphones, tablets and other battery-powered equipment. Furthermore, its digital current feedback scheme, active current and voltage flatness compensation, shrinkable ringer length, and multiple soft-start functions make it easier to optimize product performance and design.

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