4.5V Dc Adapter Radio Shack

Description

AC/DC adapter, or plug-in power supply, is an electrical device that takes input power from a mains power supply and converts or derives the right current, frequency and voltage to power the component  Main power supplies provide power to devices that run on batteries or have no other power source. 

Input Specification

Voltage: 100-240VAC

Frequency: 50-60Hz

Out Specification

Voltage:5V-10V

Current:0.5A-1A

Power:7.5W

Ripple and Noise:100mVp-p max

Turn On Time:15-30mS

Voltage Accuracy: ±3%

Current Accuracy: ±3%

Efficiency:DOE

Short circuit protection

Over voltage protection

Over current protection

Over temperature protection

Tests Environmental Specifications

Voltage: 380V 50Hz, the voltage can be as customoer’s demand

MOQ: 1000 units

Universal power adapter Application:

These are 4.5V Dc Adapter Radio Shack suitable for applications such as chargers, set-top boxes, motor control and other office automation products.

At first, the conversion frequency of switching power supply was generally 20kHz. The reason is that the components used, especially semiconductors, have high consumption and cannot be high-frequency. Only 20kHz can be used.

However, in the future, in order to miniaturize the power adapter, semiconductor devices such as switching elements or rectifiers with improved high-frequency operating characteristics, magnetic materials and capacitors have been continuously developed. Due to the improvement of the application technology of these elements, 50KHz ~ 100kHz is now dominant, and a small number of commodities exceeding 200kHz also appear.

However, in the switching power supply, the switching element part or rectifier part produces high-frequency noise. Therefore, the above noise that does not exist in the lossy power supply occurs not only on the output side, but also on the input line. When the noise level is high, it will not only make the equipment malfunction, but also sometimes affect other equipment through commercial wires or directly as radiated noise.

Here, in order to improve the conversion frequency and obtain a high frequency, we must try to make the switching action high-speed, and the resulting noise level will further increase. In order to miniaturize the power supply, the concentration of heat source due to miniaturization must be avoided, and the whole circuit must be considered to reduce loss and improve efficiency. Therefore, in the case of high-frequency switching power supply, high efficiency and low noise play an important role as an important topic.

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