LM3503ITL-35/NOPB

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LED (Light Emitting Diode) drives are becoming increasingly important components in modern lighting designs, thanks to their efficiency and longevity when compared to traditional light bulb technologies. For that reason, precision control of these devices is essential, and this is where PMIC (Power Management Integrated Circuit) comes in. The LM3503ITL-35/NOPB is a PMIC-based LED driver, designed to provide precision control over a wide range of output currents. Here, we will take a look at its key features, its application fields and its working principle.

Key features of the LM3503ITL-35/NOPB

The LM3503ITL-35/NOPB is a high-efficiency, low quiescent current LED driver, featuring a wide range of output current and high-side current sense limit. It also has a wide operating range, from 0V to 18V and adjustable output current of up to 20mA. The PMIC is designed to operate at temperatures up to 125°C, making it suitable for high-power applications. The driver also offers short-circuit protection along with an open drain capability.

Application field

The LM3503ITL-35/NOPB is ideally suited for use in automotive lighting, such as tail lights, side markers and interior lighting. It is also suitable for LED lighting systems indoors, such as restaurant, shop and retail displays or decorative LED light strips. In addition, the driver can be used in outdoor lighting, such as street lighting and outdoor advertisements.

Working principle

The LM3503ITL-35/NOPB is an integrated circuit, which means it contains several components connected together on a single chip. These components include an output transistor, an error amplifier, a current sense amplifier and a regulation loop, as well as other components such as an overvoltage protection circuit, a current limit circuit and a thermal shut-down circuit. The basic operation of the PMIC is as follows:

• The input voltage is applied to the input of the error amplifier, which amplifies the voltage difference between the input and the reference voltage.
• The amplified voltage is then applied to the base of the output transistor, which acts as a switch, turning on and off the LED.
• The current sense amplifier detects the output current of the LED, and compares this to the current limit set in the regulation loop.
• When the current limit is exceeded, the output transistor is turned off, preventing excessive current draw.

The LM3503ITL-35/NOPB is a very efficient PMIC, offering up to 95% efficiency in most applications. It is also very versatile, allowing for a wide range of output current as well as overvoltage protection. Thanks to its features and performance, it is an ideal choice for applications that require precision control over a range of output current.

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