LM3503ITLX-44/NOPB

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Application Field and Working Principle of LM3503ITLX-44/NOPB

The LM3503ITLX-44/NOPB is a buck-boost dual-mode LED driver from the Power Management Interface Circuits (PMIC - LED Drivers) family. Using this dual-mode LED Driver, users can easily design a power system that can be used in automotive, mobile, and other battery-powered devices. This LED driver provides a simple, low-cost solution for applications that require both a constant current source and a constant voltage source.

Key Features and Benefits

• Wide input voltage range: 5.5V to 18V
• Wide output voltage range: Up to 36V
• Wide adjustable output current range: From 10mA to 0.5A
• Input current regulation for improved efficiency
• High-side floating source output
• Thermal shutdown protection and over-current protection
• Low EMI noise generation
• Applicable to a range of topologies

Application Examples

• LED backlighting systems
• LCD panel backlight
• Lighting and decoration in automotive
• LED display panels
• Display backlighting in TVs, notebooks, and smart phones

Another Element – Working Principle

The LM3503ITLX-44/NOPB is designed for buck-boost dual-mode operation. When the input voltage is higher than the output, the device operates in buck mode to step-down the output voltage to the desired level. When the input voltage is lower than the output, the device operates in boost mode to increase the voltage from the input and achieve the desired output voltage.

During buck-mode operation, the device employs a fixed-frequency, current-mode step-down architecture, allowing for higher power conversion efficiency, especially over short duty-cycle cycles. The LM3503ITLX-44/NOPB has an input current regulation loop, which allows it to automatically adjust the duty cycle to maintain the input current in a pre-determined range.

During boost-mode operation, the device uses a current-mode hysteretic control scheme. The hysteretic loop allows the LM3503ITLX-44/NOPB to rapidly and precisely regulate the output current even during very lightloads – as low as 10mA. The hysteretic control scheme also reduces the number of external components required to regulate the output current.

In addition to the standard buck-boost dual-mode operation, the LM3503ITLX-44/NOPB can also be configured to operate in buck-only or boost-only mode. This allows the device to be used in a variety of applications that require a single output type.

Additionally, the device provides a number of safety features, including an over-temperature protection circuit and an over-current protection circuit. The over-temperature protection protects the device from temperatures above a set level, while the over-current protection prevents the device from drawing more than a preset amount of current.

The LM3503ITLX-44/NOPB is an ideal solution for a variety environmental applications that require a regulated output voltage from a wide input voltage range. Its compact size and feature list allow for a wide variety of applications.

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