LM3492HCQMH/NOPB

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Introduction

PMIC (Power Management IC) - LED Drivers are specified to control the drive current and the output voltage of LEDs based on the power flowing through them. Their design contains varied advanced features such as part-turn dimming, PWM dimming, expoxy-free isolation technology, multiple- LED parallel connection capability, integrated power converter, and other characteristics for improving system efficiency and lowering system cost. LM3492HCQMH/NOPB is one of the popular LED drivers from Texas Instruments (TI), which is designed to provide precise LED current control and high-efficiency LED illumination solutions.

Applications

The LM3492HCQMH/NOPB offers wide range of applications such as Backlighting, Automotive Lighting, Street & Stadium Lighting, Industrial Lighting, and lighting applications in general. Its properties make it suitable for indoor and outdoor lighting applications, where control of the size and shape of the beam produced, providing accurate and reliable drive current for a variety of LEDs and configurations. The output voltage is designed to address common requirements such as powering a discrete resistor on a string of LEDs from a 6V dc to 36V dc input voltage.

Features

• Compactly designed with an operating temperature range of –40 °C to 85 °C.
• Programmable slope generator and simple current programming.
• High integration level protects LEDs from failure and overstress protection.
• Initial LED Current Accuracy of ±3%.
• On-chip oscillator provides startup capability.
• Simple term timing.
• Optional phase dimming is available too.

Working principle

LM3492HCQMH/NOPB is based on XLRS (External Led Reference System) architecture. It follows a simple connection diagram for configuration and making operation. Two external resistor values are used for setting the LED sinks current and the LED string voltage. The LED sink current is a fixed value from the default and then it is dynamically controlled during the operation, based on the GATE signal.

The voltage across the LED string is constantly monitored and then compared to the reference voltage to adjust the switching frequency or pulse width of the power MOSFET to keep the voltage and the current constant. This constant feedback loop is used to provide precise LED current control and also to protect the LED string from overstress situations.

The dimming process in this device is simple and requires two logic signals to enable and disable the gate signal that is generated to enable the switching of the MOSFET. The dimming range of underdrive and overdrive can be limited to fine tune the power saving and the light output.

Conclusion

The LM3492HCQMH/NOPB from TI is a high performance LED driver that is optimized for accuracy and reliability applications. It is designed with an in-built power converter and advanced features to provide precision current control from a 0 to 24V dc input voltage range. With its wide range of applications and technical characteristics, it finds suitable applications in backlighting, automotive lighting, street lighting, industrial lighting and general lighting requirements.

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