AC-DC Converter TOP227YN Product Highlights? Lowest Cost, AC-DC Converter TOP227YN Lowest Component Count Switching Solution? Cost Competitive with Linears 5 W+? Very Low AC/DC Losses - Up to 90% Efficiency? Built-in Auto-Restart and Current Limiting? Latching Thermal Shutdown System Level Protection? Implementing Flyback, Forward, Boost or Buck Topologies? Works with Primary Feedback or Opto Feedback? Connection tab for low EMI? Simple circuit, design tools reduce time to market

The second generation TOPSwitch™-II series has a higher cost performance, AC to DC converter TOP227YN and offers several enhancements over the first generation TOPSwitch series. The TOPSwitch-II series extends the power range from 100W to 150W for 100/115/230 VAC input and from 50W to 90W for 85-265 VAC universal input. This brings the advantages of TOPSwitch technology to many new applications, such as TVs, monitors, audio amplifiers, etc. Many significant circuit enhancements that reduce sensitivity to board layout and line transients now make design easier. Standard 8L PDIP package option reduces cost in low-power, high-efficiency applications. The package's internal leadframe uses six pins to transfer heat directly from the chip to the motherboard, eliminating the cost of a heatsink. TOPSwitch integrates all the functions required for a switching mode control system into a three-terminal monolithic integrated circuit: power MOSFET, PWM controller, high voltage start-up circuit, loop compensation and fault protection circuit.

The following precautions should be followed when testing TOPSwitch in isolation from the power supply. Lab testing of TOPSwitch is recommended using the schematic shown in Figure 14.

When the drain power is turned on, the unit will be in auto-restart mode. The control pin voltage will oscillate at a low frequency of 4.7 ~ 5.7 V, turning on the drain every eight weeks. If the control pin power is turned on at the same time

Bench Test Considerations for Evaluating Electrical Characteristics

Typical performance characteristics

In this auto-restart mode, there is only a 12.5% chance that the control pin oscillation is in the correct state (drain active), allowing a continuous drain voltage waveform to be observed. If you want to observe a continuous drain voltage waveform, it is recommended to turn on the VC power first and then the drain power. The probability of being in the correct state is 12.5%, thanks to an 8:1 counter. Temporarily shorting the control pin to the source pin will reset the TOPSwitch and then the TOPSwitch will appear in the correct state

Shenzhen Tianzhuo Weiye Electronics Co., Ltd.

In the past 10 years, Shenzhen Tianzhuo Weiye Electronics Co., Ltd. has seized the historical opportunities brought by China's reform and opening up and the rapid development of the electronics industry, adhered to customer-centricity and high-quality products as the foundation, and provided customers with one-stop procurement services for components. Won the respect and trust of customers, from an entrepreneurial company based in Huaqiangbei, Shenzhen Special Economic Zone, China, it has grown steadily into an electronic component supplier with several well-known brand product lines and customers in many countries and regions around the world. Distributed and wholesaled electronic IC and 3C sell well in the consumer market and enjoy a high status among consumers. The company has established long-term and stable cooperative relations with many retailers and agents