12W universal input constant voltage adapter based on TNY278PN design, with circuit diagram, bill of materials, specification file, printed circuit
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.
This document includes power specifications, circuit diagrams, bill of materials, transformer specifications, printed circuit board layout, and performance data.
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
Voltage input constant voltage adapter PCB physical map
Constant voltage adapter circuit diagram for voltage input
Constant voltage adapter PCB layout for voltage input
List of constant voltage adapter components for voltage input
See the PDF document for details (click on the PDF file to download)
Tianma Microelectronics Co.,Ltd., founded in 1983, is a high-tech enterprise specializing in the production and operation of liquid crystal display (LCD) and liquid crystal display module (LCM). After more than 30 years of development, has developed into a set of LCD research and development, design, production, sales and service as one of the large public listed companies. Tianma of Shenzhen, Tianma of Shanghai, Tianma of Chengdu, Tianma of Wuhan, Tianma of Xiamen, Tianma of Europe, Tianma of the United States, Tianma of South Korea, etc. STN-LCD, CSTN-LCD, TFT-LCD and CF production lines and module factories. The company's marketing network throughout the world, products are widely used in mobile phones, MP3/MP4, on-board display, instrumentation, household appliances and other fields. In terms of technical level, product quality, product grade and market share, it ranks among the top in the same industry in China and has become a leading enterprise in the field of small and medium-sized display.
The company is mainly engaged in the design, manufacture and sales of LCD and related materials, equipment and products, providing related technology development, technical consultation, technical services and technology transfer, and engaged in the import and export of goods and technology. Specializing in LCD screen and module design, research and development, manufacturing, sales and after-sales service. Production used for LCD, laptop, LCD TV, digital video and audio, car GPS, industrial medical products and other models of display screen and module. Products are widely used in mobile terminals, car display, aviation display, industrial control medical, entertainment display and other small and medium-sized display fields.
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Tonya Display Limited , https://www.tydisplay.com