LM2703MF-ADJ Integrated Circuits (ICs)

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The LM2703MF-ADJ is a high performance LEDs current regulator designed for use in all automotive, industrial, and lighting applications. This device is designed to allow designers to easily adjust the LED current over a range of up to 2A. The LM2703MF-ADJ can be used with a variety of LED configurations including single, series and parallel strings. In addition, the device includes an adjustable voltage regulator making it ideal for controlling the voltage across multiple LEDs.

The LM2703MF-ADJ is a PWM buck-mode controller that uses an internal MOSFET to control the current in the LEDs. It is designed for fixed frequency operation of 400KHz with an adjustable duty cycle. The LM2703MF-ADJ provides high efficiency and good thermal performance. The device offers programmable over current protection, short circuit protection and thermal shutdown protection. The device includes a number of features that enhance thermal performance such as a trickle feature that cuts off the MOSFET when no current is flowing, and a wide range of output current regulation options.

The LM2703MF-ADJ applications include LED lighting (e.g. streetlamps, signage and general indoor lighting), automotive lighting and industrial lighting. It is well suited for automotive headlights, brake lights and turning signals, as well as safety and exterior lighting applications. The device is also suitable for lighting applications in factories, warehouses, and other large areas.

The LM2703MF-ADJ working principle is based on the principle of linear regulation. The output voltage across the LEDs is proportional to the LED current. This can be adjusted by controlling the duty cycle of the PWM control signal. The duty cycle is determined by the voltage at the error amplifier input and the voltage divider. This voltage is then compared to a reference voltage to determine the duty cycle. The duty cycle determines whether the MOSFET is on or off and thus the LED current.

The LM2703MF-ADJ also includes a power limiting feature which helps to prevent over current flow and device failure. This feature can be adjusted between 0A and 2A to ensure proper LED current consumption. The device also includes several features to ensure long-term reliability such as soft-start, under voltage lock out and short-circuit protection.

In conclusion, the LM2703MF-ADJ is an efficient and cost-effective PWM buck-mode controller that is well suited for a wide range of LED lighting applications. It is easy to adjust the LED current over a range of up to 2A and provides programmable over current protection and thermal shutdown protection. The device also includes a number of features such as power limiting, soft-start, under voltage lock out and short-circuit protection to ensure reliability and long life.

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