AAT3190IKS-T1

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LED Driver is a kind of power management Integrated Circuit (PMIC) which is dedicated to driving and controlling LEDs. AAT3190IKS-T1 application field and working principle is an example of LED Driver, Which is a constant current high-efficiency DC-DC step-down LED driver that achieves 95% efficiency and above.

AAT3190IKS-T1 Application Field

The AAT3190IKS-T1 is suitable for use in all kinds of portable electronic and consumer electronic device, such as tablet PCs, notebook PCs and consumer electronic device. It feature, such as low quiescent current, high efficiency and small size, makes it ideal for driving high brightness LEDs in portable applications. The AAT3190IKS-T1 is a constant current step down DC-DC circuit, which can optimally drive several white (WLEDs) or RGB LEDs in a series or multiple strings. It provides an achievable efficiency of up to 95% in most applications.

AAT3190IKS-T1 Working Principle

The AAT3190IKS-T1 is a high efficiency step-down LED driver with built in MOSFET switch. The circuit includes a power switch, a current regulator, and a feedback network for controlling the output current. The circuit contains an input voltage range from 4.5V to 24V and can shut off at voltages below 4.5V. A typical source voltage of 12V will generate a current range of 30mA to 180mA to the LEDs being driven.

The AAT3190IKS-T1 works by transferring energy from the input source to the LEDs by turning on the power switch for a short time interval, then turning it off and allowing the inductor current to flow through the LEDs, thus creating a regulated output current. The output current is regulated to a precise value by measuring the current at the output of the power switch. If the current exceeds the preset value, the switch will turn off and the inductor current will decay to zero.

The maximum output current is controlled via a single resistor between GND and OUT tied to the FB pin. This resistor also adjusts the transition frequency and the transition slope of the driver, allowing the user to optimize the driver output for different applications. The output current can be scaled up or down by changing the resistor value, making the AAT3190IKS-T1 ideal for driving LEDs from the same source current with optimized efficiency.

Conclusion

The AAT3190IKS-T1 is a high-efficiency, integrated LED driver optimized for high-brightness LED applications. Operating from a single 4.5V – 24V input source, it produces a regulated constant current to drive multiple LED strings and white or RGB LED with efficiency up to 95%. The output current is adjustable via a single resistor and the transition frequency and transition slope can be optimized for different applications.

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