AP78L05VL-A

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The AP78L05VL-A is a linear voltage regulator with great performance and wide application field. It is a three terminal device made up of on-chip power amplifier plus voltage regulator. It has the integrated maximum power output of 120 mW and the voltage regulator has an adjustable output voltage range of 1.25 V to 13.0 V with a minimum current of 1 μA. The maximum output current I_load is 100 μA.

When the AP78L05VL-A is used in specific application, a minimum load of 1 μA may be required. This means a minimum amount of power is consumed at the output and this may bring about a fluctuation of the voltage at the set point. An external capacitor (C_out) can be connected to the chip in order to reduce these fluctuations. C_out reduces the dynamic ripple and helps maintain the stability of the output voltage.

With regards to working principle, the AP78L05VL-A consists of an error amplifier and a voltage reference. The output voltage is formed when the voltage reference is amplified by the error amplifier. The voltage reference and error amplifier are both inside the chip package and they directly control the output voltage. Different output voltages can be set by varying the value of the external resistors R1 and R2. The external resistors R2 and R1 form a voltage divider network with the output voltage determined by the ratio of the two resistors.

The whole process starts with R2 and R1 setting up an input voltage to the voltage reference. When the voltage reference is within the working range, the error amplifier amplifies the error voltage between the input voltage and the voltage reference. After that, the current flows through the bias resistors, R3 and R4 controls the voltage output. The external capacitor C_out helps smoothing out the voltage fluctuations at the output.

The AP78L05VL-A is highly versatile, and it is widely used for various applications such as manufacturing electronic products and embedded systems. It is ideal for implementing voltage regulation in mobile and handheld devices, computer servers and automotive systems. Due to its low input/output voltage, high output current and small package size, it is compatible with lithium batteries that require low input/output voltage. Furthermore, its uni-polar output voltage allows the application not to require positive/negative polarity.

In conclusion, the AP78L05VL-A is a highly efficient and miniaturized linear Voltage regulator, which offers high levels of versatility, reliability, and stability. It is able to regulate the output voltage within a wide range and it is ideal for Embedded Systems, consumer electronics and automotive systems.

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