AS3824A-ZQFT

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The AS3824A-ZQFT is an LED driver integrated circuit (IC) created by austriamicrosystems, and classified as a PMIC - LED driver. This IC is a simple solution for microcontroller-based applications that require a single-cell battery supply operation, and is designed to be used with minimal external components. AS3824A-ZQFT is ideal for applications in the industrial and commercial sectors, where high reliability and low power consumption are essential.

Application Field

The AS3824A-ZQFT is used in variety of applications requiring LED lighting, including displays, indoor lights, outdoor lights, touch screen displays, mobile phone cameras, photographic equipment, automotive lighting, and any other application requiring a reliable, low-power LED driver. Additionally, this IC can be used in several other applications including measuring device circuits, optical sensors, night-light and motion sensor circuits.

Working Principle

The AS3824A-ZQFT works as a bridge between two separate power voltages as it takes its input from a 3V battery. The Autonomous Operation algorithm it uses, maximizes battery lifetime by autonomously managing the LED current level. When the input voltage tends to drop, the chip modulate the LED current downwards to adjust the output, hence maintaining a constant LED light intensity. The AS3824A-ZQFT contains two independent current settings which enable the user to independently control how much current is drawn by each LED.

The AS3824A-ZQFT LED driver incorporates several highly efficient regulators and an LED current regulator circuit. The internal boost regulator starts from the low battery voltage and boosts it up to the required output voltage for the LED. In addition, the boost efficiency improves by one of the internal regulators, which switches the output voltage to a low ripple. This regulator helps significantly reduce power consumption, extending battery life. The integrated current regulator controls the LED current setpoint accurately and stabilizes the output current even in the case of input voltage variations.

The AS3824A-ZQFT also incorporates several safety features to enhance its reliability. Its Internal Fault Detection circuit monitors the output current of the device and shuts down the output when it exceeds a certain threshold. The overvoltage protection circuit is activated when the output voltage exceeds a predetermined threshold. Finally, the IC includes integrated circuit protection to prevent current and thermal overloads, as well as to protect it against ESD and electromagnetic interference.

Conclusion

The AS3824A-ZQFT LED driver provides reliable and low-power operation for LED lighting applications, with integrated safety features and low external component count. It can be used with minimal external components, including a 3V battery and LED. Its Autonomous Operation algorithm maximizes battery lifetime by autonomously managing the LED current level, and the Integrated Fault Detection and Overvoltage Protection circuits ensure that the output is shut down when it exceeds a certain threshold.

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