RAC15-12DA-ST

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AC-DC converters are electronic components widely used in modern electrical applications. The RAC15-12DA-ST is a popular example of such a converter, and is used in a variety of applications ranging from industrial automation to consumer electronics. The following article explores the application field and working principle of the RAC15-12DA-ST in further detail.

General Overview

The RAC15-12DA-ST is a high-efficiency, rectified AC/DC, 15W, 5V 3A module converter. It is a single-phase, AC/DC, full-bridge rectifier with an output current of up to 3A and a peak current of up to 5A. The operation voltage is semi-regulated and ranges from 85V AC to 264V AC. The insulation voltage is up to 2.5kV AC, and the product has a working temperature range of -40°C to 80°C.

Input and Output Characteristics

The RAC15-12DA-ST has a wide range of input characteristics, which makes it suitable for a variety of applications. The input voltage is programmable, allowing you to set the input voltage range according to the application at hand. The input current is also adjustable; the low input current mode works at 1.6A, while the high input current mode operates at 2.5A. The ripple and noise of the input is less than 20mV throughout the voltage range.

The output voltage of the RAC15-12DA-ST is adjustable, with a voltage range of 5V ±1%. The output current of the converter is also adjustable, ranging from 0A to 3A. In order to ensure stability and reliability, the output voltage is regulated to within 2%. The ripple and noise is less than 100mV.

Protection and Over-current Protection Features

The RAC15-12DA-ST features several protection circuits to ensure safety and reliability. It has a heat-dissipating, aluminum material enclosure and is rated at IP21. The converter also has a built-in DC OK signal pin to indicate the proper load connection status. It also has an over current protect circuit to prevent device damage from overloads. The converter is also short circuit protected and has a shut down time of 20ms.

Working Principle

The RAC15-12DA-ST converter works on the principle of input-side rectification and output-side regulation. The converter first rectifies the AC input power into DC power. This is done by the two bridge diodes, which allow the current to flow during the positive half cycle of the AC wave, and block the current during the negative half cycle. The output of the bridge rectifier is then smoothened by an inductor filter, which produces an average DC voltage.

The next step of the RAC15-12DA-ST is to regulate the output voltage to 5V. This is done by the integrated DC/DC converter, which uses pulse width modulation (PWM) to control the voltage regulation. The PWM circuit adjusts the duty cycle of the switching transistors to regulate the output voltage according to the desired 5V setting. The output voltage is then connected to the load via the output filter circuit.

Conclusion

The RAC15-12DA-ST is a popular AC/DC converter due to its numerous features and wide range of application. Being a high-efficiency, single-phase, rectified full-bridge AC/DC converter, it is well-suited for a variety of industrial, commercial and residential applications. It features an adjustable input voltage and an adjustable output voltage of 5V ±1%. The RAC15-12DA-ST also has several safety features such as overcurrent protection and short circuit protection. Finally, it works on the principle of input-side rectification and output-side regulation.

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