LM3686TLX-AAED/NOPB

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Overview

The LM3686TLX-AAED/NOPB is an advanced ultra-low Iq, low voltage regulator that combines both linear and switching regulation technology into a single integrated circuit. It is designed to provide a very low quiescent current while still maintaining very accurate output voltage regulation. It is capable of handling up to the maximum output current of 2A and offers excellent protection features. This paper will discuss the application fields, working principle and features of LM3686TLX-AAED/NOPB.

Application Fields

The LM3686TLX-AAED/NOPB is a versatile device that can be used in a variety of applications, including cellular phones, PDAs, gaming consoles, and point-of-sale terminals. It is designed to provide the constant voltage required for low voltage DC/DC conversion with minimum external circuitry. It is also suitable for automotive applications such as smart battery chargers, LED driver, LCD bias, and LED backlight control.

Working Principle

The LM3686TLX-AAED/NOPB is a high-efficiency step-down DC/DC converter with two control loops. The first loop continuously adjusts the voltage at theFB pin, thus regulating the output voltage. The second loop is used to control the on time of the N-MOSFET internal switch. The on time is adjusted to provide the maximum power efficiency and minimize the current ripple. The device features an adjustable soft-start and an output voltage overshoot protection. In addition to the two control loops, the LM3686TLX-AAED/NOPB also features a power factor control loop. The power factor control loop is used to reduce the current ripple by comparing the average voltage and the output voltage. This ensures that the output voltage is always regulated, even at light load conditions. The device also has a frequency foldback feature. This feature is designed to reduce the switching frequency at light load conditions to reduce the current ripple and the acoustic noise of the system. The device can also be put into a power-saving mode when the current draw is small enough.

Features

The LM3686TLX-AAED/NOPB offers several features that make it an ideal choice for a variety of applications. First, the device has an adjustable soft-start feature that minimizes inrush current during startup. This is especially important when the device is connected to a battery or any other power source that might be overloaded by a large amount of current. Second, the device has a selectable maximum duty cycle of 95%, 90%, or 80%. This allows the user to customize the device performance to the application. Third, the device has thermal shutdown protection. This helps prevent the device from overheating due to excessive current draw. Fourth, the device has over voltage protection that prevents the output voltage from exceeding the safe operating voltage range. Fifth, the device features a power factor control loop that reduces the current ripple. Finally, the device has a frequency foldback feature that reduces the switching frequency at light load conditions.

Conclusion

The LM3686TLX-AAED/NOPB is an advanced low voltage regulator that combines linear and switching regulation technology into a single device. It is designed to provide very low quiescent current while still maintaining very accurate output voltage regulation. It offers excellent protection features and can be used in a variety of applications. This paper has discussed the application fields, working principle, and features of the LM3686TLX-AAED/NOPB.

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