AN78L20M

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The AN78L20M is a linear voltage regulator designed to regulate the output voltage over a wide range of current output levels, making it ideal for a variety of applications. The device provides a regulated output voltage of 1.7V-6V, and incorporates a wide input voltage range of up to 12V, allowing it to be used in a variety of systems. It has a high sensitivity comparator that features open loop voltage regulation, and a low output impedance allowing for a stable output voltage. The device is constructed in a cost effective SOT-23 package, reducing board space and making it easier to solder onto PCBs.

The AN78L20M is designed for use in both linear and switching power supplies. As a linear regulator, it provides regulation of both voltage and current, ensuring that the output voltage is kept constant throughout a wide range of input voltages and currents. As a switching regulator, it provides a low-noise, high-efficiency power source, capable of handling a wide range of current loads. Additionally, its low quiescent current draw allows it to be used in low-power applications, such as battery-powered systems.

The AN78L20M has internal short circuit protection, protecting the device and system in the event of an overload. It also has thermal protection, which shuts down the device when the ambient temperature exceeds a specified maximum limit. It has a 3-pin SOT-23 package and can be connected directly to the power source and output load. The device is galvanically isolated from the power source, providing a safety feature for the user.

The working principle of the AN78L20M is simple but highly effective. It uses a voltage feedback technique to control the output voltage. The internal current mirror monitors the output voltage and adjusts the regulator’s output current to keep the output voltage constant. The device also has a high gain operational amplifier that reduces noise at the output voltage. This allows for high regulation accuracy, even at low output voltages.

The AN78L20M is most often used in small to mid-power portable electronics and battery-operated systems, due to its low quiescent current draw, low output impedance and wide input voltage range. It can also be used in high power industrial applications, providing precise, stable and reliable voltage and current regulation at high power levels. Some typical applications include battery-operated devices, embedded systems and industrial equipment.

The AN78L20M is an excellent choice for a wide range of linear and switching power supply applications. Its low quiescent current draw, high sensitivity comparator, low output impedance and wide input voltage range make it the ideal choice for a variety of applications. Its cost-effective SOT-23 package reduces board space and makes it easier to solder onto PCBs. The device’s simple, yet highly effective working principle ensures precise, stable and reliable voltage and current regulation.

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