LM3434QX/NOPB

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A Power Management Integrated Circuit (PMIC) is a component used to regulate various electrical and computer systems. One type of PMIC, LED drivers, are utilized in a wide variety of applications for controlling LED light sources. The LM3434QX/NOPB is a premium LED driver equipped with a variety of features. This PMIC is specifically designed for lighting and display applications, allowing for the smooth regulation of LED current. The LM3434QX/NOPB application field and working principle will be examined in this article.

Circuit Description

The LM3434QX/NOPB is a medium size three-channel MOSFET gate driver IC in 4mm x 4mm TQFN and 4.4mm x 4.4mm HVQFN packages, designed for 15V and 12V LED systems respectively. The LM3434QX/NOPB features three independent dimming channels for controlling the LED brightness, enabling both analog and digital dimming capability. It is equipped with an I2C - compatible interface to regulate LED current.

Applications

The LM3434QX/NOPB is best suited for LED lighting systems such as LED backlighting, LED dimming control, LCD displays, and indoor & outdoor light displays. It can be used in automotive headlamps, day running lamps, interior lighting, vehicle clusters, and infotainment systems. It is also suitable for consumer products such as home appliances, media systems, smart phones, and digital cameras.

Working Principle

The LM3434QX/NOPB utilizes a control algorithm to dynamically regulate the LED current. This is achieved by monitoring the voltage across the sense resistor to determine the current level. Based on this, the MOSFET drivers are operated to achieve the desired current level. The dimming control is based on pulse width modulation (PWM).

The LM3434QX/NOPB is also equipped with a number of protection features to help promote longer LED life and safe operation. It has an over-temperature protection and an over-current protection that will shut down the MOSFETs if the temperature or current levels exceed the specified parameters. Additionally, the device also supports soft start programming to ensure the device starts up smoothly.

Conclusion

The LM3434QX/NOPB is a premium LED driver IC specifically designed for LED implemented lighting and display applications. It is equipped with three independent dimming channels, making it suitable for a variety of applications such as automotive headlamps, LCD displays, and consumer products. In addition, it is also equipped with a number of protection features to ensure safe operation and longer LED life.

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