As the summer approaches and the temperature rises, I believe that you will think that overheating is not a good thing. Whether it is people or equipment, anything that gets too hot is not what everyone wants. As industrial application requirements continue to expand, such as factory automation and grid infrastructure, systems must have more diverse functions to meet these needs. At the same time, higher requirements are placed on the power management system, not only to ensure the best performance of various circuits, but also to avoid the temperature rise of the equipment. A previously published blog post describes the use of isolators to protect the low-voltage side of the system from the high-voltage side. Data isolators make signal isolation easy. But it is not enough to isolate the data, and the power supply needs to be isolated. In some cases, there are two isolated power supplies that can be used directly on the primary and secondary sides of the isolator. But there are still some cases where there may be no secondary power. At this point, an isolated secondary power source needs to be generated from the primary power source. Figure 1 shows a solution for building an isolated power supply using discrete components. A push-pull signal is generated from a transformer drive operating from the primary source to drive the primary winding of the isolation transformer. The transformer produces the required secondary voltage based on the turns ratio. The rectifier diodes behind the transformer help rectify, and the latter regulator helps smooth ripple. If the output of the rectifier is good enough for system performance, the regulator can even be removed. Figure 1: Isolated power supply with discrete components The solution provides very good power transfer efficiency through an external transformer, but using multiple devices increases system cost and board space. If the system uses multiple isolators, you need to duplicate the discrete circuits to match the number of isolators, but this increases system cost and board space. A single-chip solution that provides isolated signals and power can solve these problems. Figure 2 shows TI's ISOW7841, which provides isolated data and power. The device does not require external components to build an isolated power supply. The integrated DC/DC converter provides up to 650mW of isolated output power and reduces board space and solution cost due to integration. Figure 2: Isolated Power and Serial Peripheral Interface for Analog-to-Digital Converter Sensing Applications Using ISOW7841 One issue that may be of concern is whether this integration can cause device and system temperatures to rise, resulting in system failure. Compared to other integrated solutions, the ISOW7841 enhanced isolator with integrated power supply is 80% more efficient, as shown in Figure 3. Efficient power transfer helps provide more power to the output while maintaining low temperatures, providing additional power to drive other devices. Higher efficiency also helps to keep multiple channels together without overheating. Figure 3: Comparison of the efficiency of ISOW7841 and competing solutions other information · View the ISOW7841 data sheet. · Download the white paper, Totally Integrated Signal and Power Isolation - Applications and Benefits. · Watch the video, "Enhance isolation and power: Integrate stories." · View TI's entire portfolio of isolation products. · Search for solutions in the TI E2ETM Community Isolation Forum to interact with TI engineers and TI experts. · Start designing your industrial system with a digital isolator-optimized binary module with integrated power converter and an 8-channel isolated high-voltage analog input module reference design. · Read this article to learn how to achieve low-emission emissions through fully integrated data and power isolation
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