A6278EA-T

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The A6278EA-T belongs to the PMIC - LED drivers family. It is an adjustable current, switch mode current regulator, designed to power wLED strings composed of series-connected LEDs. This regulated current, switch mode LED driver is designed to drive a string of LEDs placed in series. It is suitable for both AC and DC input systems.

The A6278EA-T LED driver is equipped with two outputs, one for driving the LED string and one for sensing the LED current. It is provided with a built-in 32 step brightness (7 bits) fading control indexer. It is formed by a very simple power stage, ideal for very low cost applications. The device\'s innovation is based around its internal feedback loop, which controls the LED string current with 0.5% accuracy over temperature.

The maximum LED output current is about 200mA with accuracy of 0.5%; this value is internally preset and it can be increased up to 400mA using an external simple current setting resistor. The device can be configured to drive LED strings from 7V up to 36V. An adjustable maximum current limit help to reduce the power dissipation in case of overtemperature. The A6278EA-T is a very effective and efficient way to drive LED strings as it can have up to 95% efficiency with a wide range of input voltage.

The A6278EA-T can be used in a variety of applications including automotive lighting, traffic signal lighting, medical lighting, and industrial lighting. For automotive lighting applications it offers dimming capability that can be adjusted according to the environment. Other features such as over current protection and thermal shutdown ensure that the device is safe and reliable under all conditions. In industrial lighting applications, the A6278EA-T can be used to replace traditional low voltage halogen bulbs, as it allows for a more efficient and reliable solution with longer lifetime.

The working principle of the A6278EA-T is based on the switching current regulator technique. It contains a Pulse Width Modulator (PWM) stage to regulate the power delivered to the LED string. The internal RAM-coupled PWM generator consists of an ON/OFF cycle during which current is switched ON and then OFF in order to supply the desired output current. The output current is monitored via the feedback terminal and continuously adjusted by the PWM controller.

In conclusion, the A6278EA-T is a very useful component for LED driver applications due to its high accuracy, efficiency and reliability. Additionally, its adjustable current limit and dimming capabilities offer flexibility for different lighting applications. The device is very easy to apply and can be used in both AC and DC input systems.

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