LM27961TL/NOPB

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PMIC – LED Drivers are vital pieces of technology used to accurately regulate current used to power Light Emitting Diodes (LEDs). LED drivers have become increasingly popular in a wide variety of applications due to their ability to consistently provide a range of outputs required by different LED applications. The LM27961TL/NOPB is an LED driver that is specially designed for LED lighting applications and provides an impressive combination of performance, flexibility and reliability.

LM27961TL/NOPB Application and Working Principle

The LM27961TL/NOPB LED driver is designed to drive up to 2 series strings of up to 27 LEDs and offers up to 1.4W of LED power. The LED driver offers a flexible current programming interface which allows for brightness adjustment, constant current regulation and LED dimming without the need for external components. It also includes an integrated safety monitor which monitors the LED output and automatically shuts down the LED strings when it detects an out-of-range condition.

The device provides a constant current output and is able to maintain precise current regulation even when the input voltage fluctuations occur. This ensures that the LED power dissipated is consistent and keeps the LED strings from over-voltage or over-current damage. The LM27961TL/NOPB is designed to drive the LEDs with precise current, thereby providing excellent colour consistency and superior colour temperature stability.

The LM27961TL/NOPB is designed to include dynamic self-calibration and can adjust the output current according to temperature and node voltage changes. This helps to reduce the device\'s power dissipation and improve system efficiency. The device also includes an internal soft-start control which allows for a controlled start-up, ensuring that the LEDs are not damaged due to over-voltage or over-current during the turn-on process.

The LM27961TL/NOPB LED driver provides a comprehensive range of protection features to ensure safe operation. It includes over-voltage protection (OVP), under-voltage protection (UVP), over-temperature protection (OTP), short-circuit protection (SCP), open-LED protection and brown-out function protect the LED strings from various stresses.

The current level of the LM27961TL/NOPB LED driver can be set with a single external resistor and the device can also provide a precision dimming control. The LM27961TL/NOPB can be set for either constant current or constant voltage operation and can be configured to offer a wide range of dimming levels from 0%-100%.

The LM27961TL/NOPB LED driver is available in a compact 6-pin SOT-23 package and provides excellent thermal performance for operation in harsh conditions. The device has a low quiescent current and contains low EMI switching frequency. The LM27961TL/NOPB is capable of driving two strings of LEDs in parallel, so designers can easily scale up or down the driving current of a single string.

The LM27961TL/NOPB LED driver is ideal for a wide range of applications including high-intensity indoor and outdoor lighting, automotive lighting and battery-powered LED lighting. The device is also suitable for applications such as LED display signs, whiteboard signs, LCD backlighting and decorative lighting. Its wide range of features, excellent performance and reliability make the LM27961TL/NOPB an excellent choice for LED illumination applications.

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