AS3821-ZQFT

Voltage - Output:	--
Supplier Device Package:	48-QFN
Package / Case:	48-QFN
Mounting Type:	Surface Mount
Operating Temperature:	--
Applications:	Backlight
Dimming:	SPI
Frequency:	--
Current - Output / Channel:	--
Series:	--
Voltage - Supply (Max):	5.5V
Voltage - Supply (Min):	4.5V
Number of Outputs:	12
Internal Switch(s):	No
Topology:	--
Type:	Linear
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

AS3821-ZQFT is an integrated light-emitting diode (LED) driver, manufactured by ASIX Electronics. It can be used to power single-color, white, and di-color LEDs for backlighting applications. As such, it can be classified as a power management integrated circuit (PMIC) - LED driver.

Application Field

AS3821-ZQFT has two primary application fields: mobile application and general application. Mobile applications include any electronic device, such as smartphones, tablets, and laptops, which contain LED backlights. General applications include any LED module or application that requires accurate brightness control, such as LED signs. As such, AS3821-ZQFT can be used for various display applications, providing accurate and stable brightness control.

Features

The major feature of the AS3821-ZQFT is its ability to control up to 31 constant current LED drivers in parallel. This allows it to accurately provide high power LED backlighting solutions while ensuring stable and constant current. It also has many additional features such as PWM dimming with adjustable frequency, pre-programmable LED current settings, and power save mode.

Operating Principle

The operating principle of the AS3831-ZQFT is based on its integrated IC (Integrated Circuit) and PWM (Pulse Width Modulation) control. The integrated IC allows for precise control of the LED drivers, and PWM is used to regulate the brightness of the LED drivers. The integrated IC contains two main components, a voltage monitor and an LED current sink. The voltage monitor is responsible for monitoring the input voltage and controlling the voltage level of the LED drivers. The LED current sink functions as the power source for the LED drivers, providing a constant current. The PWM control system works in conjunction with the integrated IC to control the brightness of the LEDs. When the voltage of the input voltage is low, the PWM signal will be lowered, reducing the current sent to the LED drivers, resulting in lower brightness. Conversely, when the voltage of the input voltage is high, the PWM signal will be increased, providing a higher current and brighter light.

Conclusion

In conclusion, AS3821-ZQFT is an integrated light-emitting diode (LED) driver, manufactured by ASIX Electronics. It can be used to accurately power single-color, white, and di-color LEDs for backlighting applications, making it well-suited for mobile and general display applications. It features integrated IC and PWM control, allowing for precise and constant current control, as well as PWM dimming with adjustable frequency, pre-programmable LED current settings, and power save mode. As such, it can be classified as a PMIC - LED driver.

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