AP431SBN1TR-G1

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AP431SBN1TR-G1, a component of Power Management Integrated Chip (PMIC) – Voltage Reference refers to its main application field as well as its working principle.

Application Field of AP431SBN1TR-G1

AP431SBN1TR-G1 is designed as a voltage reference chip with adjustable output. It has a 1.25V voltage (1.21V~1.285V adjustable) which features low noise operation, high power supply rejection and low output voltage drift. Other than these, it has a wide operating temperature range of -20℃~85℃, allowing users to use them in multiple environments. It is mainly used for designing variable voltage calibrators, equipment’s diversity product, operating voltage is adjusted from the external power supply, DC-DC converter and the voltage balancing circuit of low noise, high precision and high speed operations. Besides, due to its high power supply rejection and low output voltage drift, and its wide operating temperature range, AP431SBN1TR-G1 is also often used in precision and low power consumption integrated circuits.

Working Principle of AP431SBN1TR-G1

The internal structure of AP431SBN1TR-G1 is mainly made up of three parts: the program circuit, the output PNP transistor and the error amplifier circuit. The program circuit acts as a voltage divider, it can control the voltage of the output PNP transistor’s emitter according to the voltage provided by a certain outside reference, so as to form an adjustable output voltage which decreases as the outside reference voltage increases. The output PNP transistor is responsible for regulating the output current, and it can work normally as long as it is given a certain base current. The error amplifier circuit provides additional gain for the pi network circuit, thereby minimizing the output voltage deviation from the reference voltage.

All in all, AP431SBN1TR-G1, a component of PMIC – Voltage Reference, is suitable for designing variable voltage calibrators, equipment’s diversity product, DC-DC converter and the voltage balancing circuit of low noise and high precision, due to its low noise operation, high power supply rejection, low output voltage drift and wide operating temperature range. Its main working principle is that the program circuit controls the voltage of the output PNP transistor’s emitter according to the voltage provided by a certain outside reference and the output PNP transistor regulates the output current, so as to form a relatively stable adjustable output voltage.

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