Summary:
Way of working
The power supply is a 12 V, 1 A output wide voltage input flyback converter using the TNY278PN device in the TinySwitch-III family. Since many functions are already integrated inside the device, only 31 in-line components (without surface soldering components) are required, which allows for a simple single-sided PCB layout.
design feature
- No-load power consumption is less than 50 mW at 265 VAC input (connected to R8)
- The efficiency of the load mode is greater than 75% (CEC standard requirements are greater than or equal to 71%)
- Different MOSFET current limit points (ILIMIT–1, ILIMIT, or ILIMIT+1) can be selected by BP/M pin capacitance values: for better design flexibility
- OVP overvoltage protection is achieved by detecting the output overvoltage through the primary bias winding
- Accurate (±5%) auto-recovery and hysteretic shutdown with hysteresis to maintain PCB temperature within safe range
- Enters the auto-restart protection state when the output short circuit and the feedback loop open loop
- Package pin creepage distance greater than 3.2 mm: Ensure reliable operation of the power supply in humid and highly polluted environments
12W universal input constant voltage power adapter PCB physical map
12W universal input constant voltage power adapter circuit diagram
12W universal input constant voltage power adapter PCB layout
12W universal input constant voltage power adapter component list
See the uploading documentation for details (click to download)
A network switch is a device that expands the network and can provide more connection ports in the sub-network to connect more computers. With the development of the communications industry and the advancement of the informationization of the national economy, the network switch market has shown a steady upward trend. It is cost-effective, highly flexible, relatively simple and easy to implement. Ethernet technology has become the most important LAN networking technology today, and network switches have also become the most popular switches.
Switch is the English name of the switch. This product is an upgrade of the original hub. In appearance, it is not very different from the hub. Because the two ends of the communication need to transmit information, and the information to be transmitted is sent to the corresponding router that meets the required standards through equipment or manually, this technology is switch technology. Analyzed in a broad sense, the equipment that realizes the information exchange function in the communication system is the switch.
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