AP131-33YL-13

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AP131-33YL-13 is a Linear Voltage Regulator from PMIC (Power Management Integrated Circuit) range, developed by Diodes Incorported. This voltage regulator is specially designed for post-regulation in Flyback, boost, and buck converters, as well in linear regulators. AP131-33YL-13 is designed to provide an efficient, low-dropout regulation of output voltages down to 1.2V usually drawn from low-voltage sources. It is available in an 8-pin SOT-89 package, with good power dissipation capability thanks to its wide operating ambient temperature range. Additionally, this voltage regulator provides a very high accuracy, low temperature coefficient and low dropout voltage.

The main application area of the AP131-33YL-13 is post-regulation for ultra-low voltage regulation, including many different topologies. Moreover, it finds application in very low-power designs because its quiescent current is 300uA with no load and 400uA with full load. Such low current is suitable for applications such as cellular phones, digital still cameras and PDAs.

The working principle of an AP131-33YL-13 linear voltage regulator is relatively simple. When the input voltage exceeds the set voltage, it passes through the output regulating other components connected in the circuit. The voltage source is then connected to the series regulator, which also acts as a reference element. This reference element maintains the output voltage to a value specified by the user, regardless of changes to the input voltage. In other words, the AP131-33YL-13 linear voltage regulator acts as a zener diode, which stops the current from flowing once it reaches a certain voltage.

The operation of the AP131-33YL-13 linear voltage regulator is straightforward. The user sets a voltage level for the output, and the integrated circuit iterates the output signal to that voltage level, regardless of changes to the input signal. Apart from providing fixed or variable output voltages, the AP131-33YL-13 includes a built-in thermal shutdown function, which prevents overheating and associated damages of the device. This feature is especially suitable for higher-power applications, where it\'s necessary to prevent heat damage.

In conclusion, the AP131-33YL-13 linear voltage regulator primarily acts as a low-current voltage regulator and reference element. It finds application in a wide range of post-regulation applications, and its features make it suitable for ultra-low voltage applications. Furthermore, its built-in thermal shutdown function allows it to be used in applications where it is necessary to prevent overheating.

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