Wide input rails are common in many electronic systems including communications infrastructure, automotive, and industrial systems. Input voltages as high as 100V need to be converted to 24V/12V/5V or other lower voltages that can be used by electronic systems. A typical solution for creating one or more low-voltage rails consists of a low-voltage integrated controller with additional drivers, FETs, and sometimes transformers. A high step-down ratio sometimes involves more than one power stage.
Increasingly, wide input voltage power management integrated circuits (ICs) that combine features previously available only at lower voltages are now available from many vendors at competitive prices. High-voltage power management ICs, such as TI’s LM5000 series of integrated controllers and regulators, can simplify the design of high-voltage power management solutions. This paper presents various application scenarios where high-voltage capability up to 100V is required and explains how high-voltage power management integrated circuits can reduce component count, enhance reliability, and facilitate design reuse. Real world circuit examples from communication infrastructure, industrial, automotive, and consumer electronic systems demonstrate the potential benefits.