LM3502ITLX-25/NOPB

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Power management integrated circuit (PMIC), also called power management IC, is a type of integrated circuit that is used to manage, control, and distribute electrical power in efficient and cost-effective way. LED drivers, as a part of PMIC, can control LED current, voltage and temperature, providing constant LED illumination, energy saving and precise light control. In this paper, the LM3502ITLX-25/NOPB LED driver will be discussed in detail, focusing on its application field and working principle.

Application Field

The LM3502ITLX-25/NOPB LED driver is a monolithic switching regulator designed for driving light emitting diodes (LEDs) in the general lighting, automotive and industrial lighting applications. It provides LED solutions for outdoor, automotive, interior ambient and accent lighting markets. It enables high-performance LED light output and minimizes the number of external components necessary to complete the circuit.

The LM3502ITLX-25/NOPB LED driver integrates a high-efficiency, low-ripple, step-down converter regulator, which can output up to 25V@1A. It also features comprehensive fault protection, hiccup mode overcurrent and thermal protection, as well as a unique ExcaliburTM overvoltage protection for indoor and outdoor applications. The device’s wide operating temperature range of -40°C to +125°C and its wide operating supply voltage range of 5V to 36V make it ideal for use in a variety of environments.

Working Principle

The LM3502ITLX-25/NOPB LED driver, based on a buck topology, operates in either a fixed frequency or an adjustable frequency pulse-width modulation (PWM) mode. In the PWM mode, the device is programmed with an active high ENABLE and a logic low SENSE. The LED current is sensed by applying a voltage to the SENSE pin, with a 1mA current source connected to ground, resulting in a voltage that corresponds to the LED current, which is regulated by the device.

In addition, the ExcaliburTM integrated circuit has a high-voltage lateral P-channel MOSFET, which acts as a clamp when the output voltage rises too high in applications that require overvoltage protection. By sensing the output voltage, the circuit can automatically turn off the P-channel MOSFET and shut down the output when necessary. This ensures a more reliable system, as it can protect the driver from any damage that may occur due to overvoltage conditions.

The LM3502ITLX-25/NOPB LED driver also features a wide range of safety features, including overcurrent protection, thermal shutdown, and fault reporting. It also includes programmable soft-start, which allows for a smooth ramp-up of the LED current and a current limit option, to ensure that the LED current is maintained within a safe range. All of these features make the device ideal for lighting applications.

In summary, the LM3502ITLX-25/NOPB LED driver is a monolithic switching regulator designed for driving light emitting diodes. It has a wide range of features, including a high efficiency low ripple step-down converter regulator, comprehensive fault protection, wide operating temperature and voltage range, as well as a unique ExcaliburTM overvoltage protection. Therefore, it is suitable for use in various lighting applications.

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