Reference design provides isolated and non-isolated 12 V auxiliary outputs from a wide 20 V to 48 V input range for power-conversion applications.
Microchip Technology has developed a reference design for an auxiliary power supply that provides both isolated and non-isolated 12 V outputs. The design is intended for applications that require auxiliary power rails alongside a primary power-conversion system. It uses an asynchronous buck converter with peak current-mode control and is designed to provide a compact and cost-effective power solution.
The reference design operates from an input voltage range of 20 V to 48 V. It provides two 12 V rails, one isolated and one non-isolated. The isolated 12 V rail can provide up to 150 mA, while the non-isolated 12 V rail can provide up to 400 mA. Together, the two rails provide an auxiliary power capacity of 6.6 W for powering different circuits within a larger system.
The design incorporates protection features to improve reliability under abnormal operating conditions. These include protection against short circuits and overtemperature conditions. An enable pin is also provided, allowing a system-level microcontroller to control when the converter is turned on or off.
The combination of isolated and non-isolated outputs makes the reference design useful for systems with different power domains. The isolated 12 V rail can power circuits that require electrical isolation, while the non-isolated rail can supply circuits that share a common ground with the input. The wide input-voltage range also allows the design to operate with different DC power sources.
Microchip provides the reference design to assist engineers in developing auxiliary power supplies. The available design resources can be used to evaluate the circuit, understand its operation and adapt the power supply to specific system requirements. Microchip categorises the reference design under data centre, industrial, sustainability, power conversion, analogue and power supply applications.
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