AP2115M-1.8TRG1

AP2115M-1.8TRG1 Application Field and Working Principle

AP2115M-1.8TRG1, also known as ‘AP2115’ is a linear, 3-terminal low dropout (LDO), low power, regulator product from Diodes company. This product is specially designed for high current and low voltage dropout applications. It offers advantages like precise voltage regulation and low quiescent current. This article will provide a brief overview of the applications and the working principle of this product.

Applications

AP2115M-1.8TRG1 is mainly used in digital television applications, which require a precise and low ripple voltage level. It is also used in applications such as LCD backlight and power IC supply. With its wide input voltage range, low dropout voltage, precise regulation and low quiescent current consumption, it can also be used in applications such as automotive DC/DC converters and solar-power charger devices.

Working Principle

AP2115M-1.8TRG1 utilizes a voltage regulator in order to automatically maintain a constant output voltage. This voltage regulator is composed of an active device, an error amplifier, a reference voltage and a transistor which works as a pass device. The active device is typically a P-channel MOSFET, which is connected between the input voltage and the ground. When a input voltage is applied, a certain bias voltage is generated at its gate, making the P-channel MOSFET conduct. Consequently, the voltage at its drain terminal is regulated to the reference voltage. This reference voltage is supplied by an in-built voltage reference and is compared with the output voltage (Vout) by the error amplifier. The output of the error amplifier then triggers the pass transistor and adjusts it’s conducting state in order to maintain the output voltage.

In order to achieve low dropout and high accuracy performance, AP2115M-1.8TRG1 also utilizes two other techniques: current-source compensation and double-pulse transition. The current-source compensation technique is used to minimize the effects of external loads by reducing the amplifier gain. Double-pulse transition is used to minimize the transient response of the regulator while switching from the power-down (OFF) mode to the power-up (ON) mode.

Conclusion

AP2115M-1.8TRG1 from Diodes is a linear, low dropout, low power regulator well-suited for applications that require precise voltage regulation and low quiescent current. It is mainly used for digital television applications, but it can be used for applications such as LCD backlight and power IC supply. This product features a voltage regulator which is composed of an active device, an error amplifier, a reference voltage and a transistor. AP2115M-1.8TRG1 also utilizes current-source compensation and double-pulse transition techniques to achieve low dropout and high accuracy performance.