LM3502SQ-35

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PMIC (Power Management Integrated Circuit) provide a comprehensive and highly integrated solution to support a wide range of requirements that are found in applications such as cell phones, laptops, tablet computers, and other consumer electronic products. LED Drivers are one particular subset of PMICs that offers power and current management solutions for applications using Light Emitting Diodes (LEDs).

The LM3502SQ-35 is a PMIC - LED Driver designed to convert a constant current into a current-modulated output to provide a uniform light output. It is a current-mode control circuit which offers high-frequency operation up to 1 MHz for high efficiency and contains several safety features to protect the LEDs. This article will discuss the application field and working principle of the LM3502SQ-35.

Application Field

The LM3502SQ-35 is designed for LED driving in the industrial, office, architectural and home lighting applications. It offers a solution for LED-based fluorescent lamp replacement in the LED industry. Its versatile design is highly flexible and can be used in products requiring a dimmable LED driver. It is able to drive up to 160 LEDs in series resulting in a maximum output of 50W for a single lamp.

In addition to its application in LED lighting, the LM3502SQ-35 is also commonly used in many other types of equipment, such as commercial freezers and refrigerators, projectors, flat panel displays and TV sets, and digital signage.

Working Principle

The LM3502SQ-35 is a current-mode buck regulator with a wide input voltage range from 7V to 72V. It is optimized to drive 10‑18 white LEDs in series with a constant current output. It also has a low part count and a small footprint, resulting in fewer components and less board space.

The circuit operates in the discontinuous conduction mode and provides low RDS(on). It is powered by a single resistor and capable of dimming down to 10% of the maximum current. The low parts count reduces the cost and board space while the PWM dimming capability provides the highest efficiency and flexibility. The wide dimming range allows the user to control the light output in desired application scenarios.

The LM3502SQ-35 contains several features to protect the LEDs from damage due to overcurrent, overtemperature, and undervoltage. The chip includes a 50V rated MOSFET for overcurrent/over-temperature and undervoltage protection and a 1.1V regulated voltage for current comparator reference.

The chip also includes a soft start to avoid high inrush current. It has a power up/down delay that ensures soft start and off ramps the LED current during shutdown. This allows the LED to stay off until the power supply reaches a safe operating level. The device also includes an over-voltage protection (OVP) function that turns off the device when the input voltage exceeds a specified level.

Overall, the LM3502SQ-35 is a highly efficient, low noise current-mode buck regulator designed to provide a uniform light output. It is ideal for LED driving applications such as LED fluorescent lamps and is available in compact, space saving packages. With its wide range of features, this LED driver is the perfect choice for many LED-based lighting solutions.

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