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How to Design High-Voltage Wide-Input Power SuppliPosted By Sebahtstian  (2nd Apr 18 at 9:41am)

Many power systems use high-voltage rails to meet power requirements of the application or achieve efficiency goals. Real-world examples include communication infrastructure, industrial, automotive, and consumer electronic systems. For instance, telecom equipment commonly uses 48-V dc rails that can often swing from about 36 up to 72 V. Power over Ethernet (PoE) equipment uses rail voltages in the 37- to 57-V range. And industrial systems using motors often operate at voltages ranging from 24 to 100 V. These dc voltages come from power buses in other equipment and increasingly from battery supplies. The power buses are the source of power for the low-voltage supplies that operate other equipment.

In general, three types of systems require high voltage. First are the systems that must operate at high-voltage levels. Examples include electric vehicles, drones, and other battery-powered equipment. Second are those systems that need to be protected from high-voltage surges and transients. Third, there are systems that don’t necessarily need high voltage, but it’s desirable for efficiency or safety.

Now wide-input-voltage power-management ICs are available that can significantly simplify the design of high-voltage power supplies. These high-voltage power-management integrated circuits can reduce component count, enhance reliability, and facilitate design reuse. Texas Instruments, using advanced, custom semiconductor-processing methods with different doping concentrations and wider component and lead spacing, has developed a complete product line of wide-VIN ICs that include power managers, dc-dc converters, LDOs, and complete power modules.
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