Saturday, May 25, 2024

Reference Design For A 15 W Isolated Power Supply

Reference design for an isolated power supply that offers safety, ground loop elimination and protection of sensitive electronics.

The EV37F82A from Microchip is an isolated power supply reference design. The MCP1012 15W Reference Design demonstrates the ability of the MCP1012 (located on the primary side) to start up a 15W AC-DC Flyback Converter and then have it commanded by a microcontroller (located on the secondary side). The MCP1012 15W Reference Design provides a hardware and software platform to evaluate a novel method of isolated secondary side control. Two key components enable the startup and secondary side regulation of an isolated power supply, the Microchip MCP1012 and the Microchip patented integrated magnetic winding transformer built by Wurth Electronic.

An isolated power supply is a type of power supply that provides electrical isolation between its input and output. This means that there is no electrical connection between the input and output sides of the power supply, and any electrical signals or noise on one side will not affect the other. This type of power supply is used in a variety of applications, including medical equipment, scientific instruments, industrial control systems, and other sensitive electronic devices that require electrical isolation for safety or performance reasons.

The reference design has an HV startup capability of 500V Continuous and 700V Transient w/series 10K Resistor. It has a programmable low-frequency oscillator (LFO) period to set startup power and is able to accept external PWM commands from a secondary controller via an isolator. The reference design offers multiple safety features including under-voltage lockout (UVLO) and overvoltage lockout (OVLO) protections, cycle-by-cycle current limiting, and overtemperature protection (thermal shutdown).

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This reference design has been tested by Microchip. It comes with required design resources such as Gerber files, schematics, BoM, etc. You can find additional data about the reference design on the company’s website. To read more about this reference design click here.


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