LM3405AXMY/NOPB

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An LED driver is an electrical device that supplies the power for LED (Light Emitting Diodes). LED drivers are specifically designed to regulate the current and voltage of LED systems and to protect LED devices from excess current and voltage during operation. LED drivers are typically incorporated into the LED system design or used as a replacement for existing drivers. The LM3405AXMY/NOPB is a type of LED driver designed to provide an efficient, cost-effective solution to drive ultra-high-power LED strings.

The LM3405AXMY/NOPB application field covers a wide range of LED lighting applications such as street lighting, decorative lighting, backlighting and interior lighting. The device provides differential current sensing and operates in both buck and boost modes by a single-wire current-sensing technique. It is capable of driving LED strings up to 30 LEDs in series. It can also perform LED dimming and soft start functions. Furthermore, it provides an adjustable PWM dimming frequency for improved LED flicker performance and configurable over-temperature and over-current protection.

Features

• Wide operating input voltage range from 2.7V to 42V
• Internal MOSFET switch with up to 3.2A rated drain current
• High light output efficiency up to 96%
• Adjustable output current level between 4mA and 1800mA
• Ideal for ultra-high-power LED strings up to 30 LEDs in series
• Configurable PWM dimming frequency, up to maximum of approximately 400kHz
• Integrated soft-start function
• Integrated over-temperature and over-current protection

Working Principle and Design Considerations

The LM3405AXMY/NOPB is designed to provide flexibility and efficiency in driving an ultra-high-power LED string. The device is capable of driving up to 30 LEDs in series and can be operated in both buck and boost configuration. It also features configurable PWM dimming frequency and operates in low-noise mode during dimming. The device provides temperature and current protections and offers multiple fault conditions to prevent LED damage.

When operating in buck mode, the input voltage is greater than the LED string voltage and the differential sensing current for LED strings is provided by DC differential current sensing pin coupled with the LED string. With this configuration, the LED current can be controlled by varying the input voltage. In boost mode, the input voltage is less than the LED string voltage and the differential sensing current is provided by a combination of internal sensing capacitor and impedance sensing, which can be configured through pin selection. In this case, the LED current is a function of input voltage and the selected impedance level.

In order to maximize the efficiency of the LED driver, it is important to consider various design considerations such as LED type, LED string voltage, LED string current, LED number, LED peak current and LED flicker. The LED string voltage and LED current should be selected according to the LED type and LED number. Likewise, the LED peak current should be selected according to the LED type, LED string voltage and LED current. The maximum LED current should be below the absolute maximum current for the device and the LED string should be evenly matched in current to avoid potential hot-spot formation on the illuminated surface. The PWM dimming frequency should be selected based on the LED type and desired flicker performance. Finally, an appropriate inductor must be chosen for the desired LED current and operating frequency.

Conclusion

The LM3405AXMY/NOPB is a robust and efficient LED driver capable of driving ultra-high-power LED strings up to 30 LEDs in series. It is designed to be used in wide range of LED lighting applications and provides adjustable PWM dimming frequency and multiple fault protection functions to prevent LED damage. design considerations such as LED type, LED string voltage and current, LED number, LED peak current and LED flicker should be taken into account for optimal performance. The LM3405AXMY/NOPB is an ideal solution for LED lighting applications requiring high power and efficiency.

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