AD8240YRM

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The AD8240YRM belongs to the PMIC (Power Management IC) LED drivers family, which provides LED drivers for general purpose LED lighting applications. The device is a step-up “Boost” LED driver, with an integrated high efficiency switching regulator. It is capable of driving single or multiple strings of LEDs with a higher voltage than the input voltage, thus offering high efficiency and reduced power dissipation. This makes it an excellent choice for powering LEDs used in a wide range of applications.

The AD8240YRM operates from a DC input voltage ranging from 4.5 V to 25 V and offers a programmable average current limit with no external components over the range of 10 mA to 300 mA. The device also features thermal overload protection and a logic enable pin. Additionally, the AD8240YRM also offers an adjustable output frequency between 300 kHz and 1.2 MHz.

The AD8240YRM support a variety of different applications, including LCD backlighting, automotive and industrial lighting, LED panel lighting, white LED integration into incidental light sources, general purpose LED lightening, etc. The AD8240YRM is capable of driving multiple strings of 4V LEDs with a peak current of up to 400mA per string, and offers high efficiency and low power dissipation.

The working principle of the AD8240YRM is based on switch mode LED driving architecture. It uses a high efficiency switching regulator for step-up conversion of the input voltage to a higher voltage, which is then regulated by current limiting to the required levels. A pulse width modulation (PWM) is used to control the output current and voltage. In summary, the AD8240YRM is a highly efficient, low power consuming and low component count, switch-mode LED driver, with voltage, current and output frequency all adjustable within wide ranges.

The main advantage of this LED driver is its high efficiency and its ability to drive large LED strings with a wide range of input and output voltages. Furthermore, its thermal overload protection ensures a stable operation and avoids potential thermal damage to the LEDs. In addition, its adjustable output frequency allows users to benefit from improved EMI reduction. Considering all the features and developments this device offers, the AD8240YRM makes an ideal choice for general purpose and high power LED applications.

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