LM3423Q1MH/NOPB

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The LM3423Q1MH/NOPB is part of a family of integrated power system management solutions by Texas Instruments, designed for high-power LEDs used in automotive lighting, automotive headlight control (HID or high-intensity discharge), and backlight applications. As such, it is classified as a PMIC - LED driver. This application note details the field of application, working principles, and general specifications of the device.

The LM3423Q1MH/NOPB is designed to manage power requirements of high-power LEDs. Its intended application is to drive constant-current regulator without the use of an external ballast. The device integrates a low-side MOSFET, a resistive current sense, an LED current source and a constant-current control loop. This integrated solution allows for the control of current to the LED in a highly repeatable and well-controlled fashion.

The working principle of the LM3423Q1MH/NOPB is founded on a constant-current control loop architecture. The device monitors the absolute LED current by sensing the voltage drop across a low-value resistor connected in series with the LED. This voltage signal is compared to an internal reference and the resulting error signal is feed back in order to stabilize the LED current. In addition, an internal control loop transfer function compensates for current variations over temperature and LED ageing.

The LM3423Q1MH/NOPB provides two inputs, IADJ and ENABLE, to control the LED current and turn on/off the system respectively. The IADJ pin is used to adjust the current of the system. It accepts up to 20V, allowing the user to control the current in each of the LEDs within the system. In order to turn off the system, the ENABLE pin must be grounded. This pin is protected from voltage greater than the input voltage.

The LM3423Q1MH/NOPB is a high efficiency, low-component count solution for driving high-power LEDs. It is a low voltage (3V to 20V) operation IC and its packaging makes it ideal for high-density SMD (surface mount device) light-engine builds. The IC is manufactured in an 8-lead TSSOP (thin-shrink small outline package) and is housed within a thermally efficient case to minimize power dissipation, reduce LED junction temperature, and increase LED life expectancy.

The LM3423Q1MH/NOPB has a wide working temperature range (from -40°C up to +125°C) and is suitable for automotive operation and extended ambient lighting. The device also offers protection against various conditions such as over current, over temperature, and under voltage. The device is highly reliable and can withstand extended periods of high temperature and power.

In summary, the LM3423Q1MH/NOPB is classified as a PMIC - LED driver and is designed to manage power requirements of high-power LEDs. Its integrated solution allows for the control of current to the LED in a highly repeatable and well-controlled fashion, while its wide working temperature range and protection against various conditions makes it suitable for automotive operation and extended ambient lighting. Its low voltage operation and thermally efficient packaging make it an ideal solution for high-density SMD light-engine builds.

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