PSAA18U-150-R-C5

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AC DC Desktop, Wall Adapters; PSAA18U-150-R-C5 Application Field and Working Principle
AC DC Desktop, Wall Adapters; PSAA18U-150-R-C5 is a universal switched-mode power supply with a wide input Voltage range. This type of product is suitable to convert AC to low Voltage DC output and widely used in products such as automated vending machines, lighting, control systems, consumer electronics, and industrial automation. With a footprint of 1.45x3.2x2.12 inches, the device can be installed easily.
Description
The device features a wide input voltage range — from 90 to 264 Vac at 50/60 Hz — with a universal input of 110/200 VAC, allowing it to be used for both desktop and wall adapters as well as other applications. It has a full range of protections, such as over temperature protection, input surge protection, over voltage protection, active carbon filter, and ripple current, thereby ensuring long-term reliability and performance. The rated output current and voltage is 5V/3A, with an output voltage accuracy of ±2%, and an output ripple voltage of less than 240mV. Cooling is provided via an innovative aluminum heat sink enclosure, which helps maintain the temperature within the device. The package also includes a power switch that can be used to toggle between alternative output levels for different applications.
Power Stage
The power stage of the device combines a power FET with a current sense resistor network, allowing it to detect over current and regulate the output. This makes the device more efficient, as it does not draw excessive current when the output is not needed, thus consuming less power. Furthermore, the power FET has a fast and accurate response to rapidly changing load conditions, ensuring no interruption on the output.
Features
The PSAA18U-150-R-C5 Universal AC DC Desktop/Wall Adapter features a number of advanced features including: 
 Wide range input voltage from 90-264Vac, 50/60Hz
 High efficiency up to 84% at full load
 Output Over Voltage/Over Temperature/Input Surge protections
 Short circuit protection and functionality
 Input filter, active carbon filter, and ripple current protection
 Low standby power consumption 
 Small size (1.45x3.2x2.12 inches)
 
 EMC Compliance
The device is RoHS compliant and has UL and CE safety certifications.
Applications
The PSAA18U-150-R-C5 is designed to provide a cost-effective solution for a wide range of applications. It supports a wide range of AC-DC applications, such as wall adapters, desktop adapters, vending machines, medical equipment, industrial automation, lighting, and consumer electronics.
Working Principle
The working principle of the PSAA18U-150-R-C5 AC DC Desktop/Wall Adapter is based on a switched-mode power supply (SMPS) system. It operates on an AC input voltage and uses the power components to rectify and further convert the input voltage to the desired output level. The SMPS system consists of a power stage — which consists of a power FET and a current sense resistor network — a control stage, an output filter stage, and a protection circuit. The power FET and the current sense resistor network enable the device to detect and regulate the output current. The control stage contains a PWM controller and other relevant circuitry for the control of the power stage. The output filter stage comprises an EMI filter, a filter capacitor, and an output indicator. The protection circuit includes features such as over-temperature protection, input surge protection, and over-voltage protection. Overall, the PSAA18U-150-R-C5 offers a cost-effective and reliable power solution for a wide range of applications. It has a universal input voltage range and a range of advanced features to ensure reliable performance and long-term reliability.

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