LP39542RL/NOPB Integrated Circuits (ICs)

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PMIC - LED Drivers

LP39542RL/NOPB is a very popular device in the Power Management Integrated Circuit (PMIC) – LED Driver. This device can provide the necessary operating power for LEDs with large current requirements. It is designed to drive large arrays of LEDs efficiently, with a wide selection of features making it well suited for light-emitting applications.

The LP39542RL/NOPB features a wide output current range of 200mA, with a minimal voltage drop. This makes it ideal for driving high-intensity lighting applications, as the device has a minimal effect on the forward voltage and maintains stable operation. The device also features a high efficiency switch-mode power supply, allowing it to deliver up to 500mA of bias current with minimal heat dissipation in a very small footprint.

The wide operating input voltage range of the LP39542RL/NOPB further enhances its operation in LED lighting applications. The device has a wide input voltage range of 3V to 15V, which allows it to operate over a wide range of currents. The device also comes with a built-in temperature sensor that protects it from over-temperature damage. Finally, the device includes a low-noise current-switch and high-side sense resistor, enabling precise current regulation.

Application Field

The LP39542RL/NOPB is an ideal device for LED lighting applications. It has a wide range of current capabilities and a wide input voltage range, allowing it to be used in a variety of LED lighting applications. Some examples include outdoor lighting, automotive lighting, industrial lighting, and decorative lighting. This device is also suitable for use in battery-operated devices, where it can help extend battery life by efficiently controlling the current.

Working Principle

The working principle of the LP39542RL/NOPB is based on a high-efficiency switch-mode power supply. In this arrangement, a high-side switch, typically composed of a MOSFET and a current sense resistor, is used to control the flow of current to the LEDs. The power supply is regulated by a low-noise pulse width modulator IC. This IC converts the input voltage into a fixed frequency switch-mode output, which is then filtered and regulated to an exact voltage. The output voltage is proportional to the current delivered to the LEDs, helping to ensure that the maximum current is never exceeded.

The LP39542RL/NOPB also features a temperature protection feature, which is designed to protect the device from damage due to excessive temperatures. This temperature protection feature works by monitoring the on-chip temperature and automatically shutting off the power supply when the temperature exceeds a certain threshold. In the event of an over-temperature condition, the device will enter a standby mode, allowing it to cool down, before resuming normal operation.

Conclusion

The LP39542RL/NOPB is a versatile device that is capable of driving large arrays of LEDs efficiently without wasting power. It is well suited for LED lighting applications such as outdoor lighting, automotive lighting, industrial lighting, and decorative lighting. The device is also suitable for battery-operated devices, where it can help extend battery life. The power supply is regulated by a low-noise pulse width modulator IC, and the device also includes a temperature protection feature that can protect it from overheating.

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