EL SEGUNDO, Calif. July 2004 - International Rectifier, IR®(NYSE: IRF), a world leader in power management technology, today announced the availability of the IRISMPS4 reference design for flyback topology AC-DC power supply circuits commonly found in DVD/CD players, set-top boxes and an array of consumer electronics. Using IR's IRIS4009 AC-DC integrated switcher as the main switch and control device, the IRISMPS4 reference design features a universal AC line input and 12V, 1A full load DC output.

A dropping resistor from the DC bus initiates start-up current for the IRIS4009. Once the circuit is started, the Vcc power for the IRIS4009 comes from the bias winding of the main transformer. The primary current control circuit consists of a current sensing resistor, which feeds a voltage proportional to the transformer primary current into the feedback (FB) pin of the IRIS4009. The secondary voltage control loop uses an LM431 precision shunt regulator as the reference and an optocoupler to feedback the information to the IRIS4009 control circuit.

The IRIS4009 combines a control IC and a low-loss, rugged HEXFET® power MOSFET in a single five-pin package for AC-DC power supplies up to 30W. It can handle over 60% more power than leading competing devices classified at the same power level as a result of application-specific silicon and package technologies. Compared to a discrete solution, the IRIS4009 cuts part count and board space by 25%, thus simplifying design.

The IRIS4009 is ideal for universal and single-input AC-DC power supplies and adaptors for consumer electronics and, also, can be used as a housekeeping / standby supply in larger AC-DC power supplies or motor drives, up to 30W open frame, or 15W closed frame.

Stephen Oliver, Marketing Manager for AC-DC Products at International Rectifier, said, "The IRIS4009 is an ideal solution for designers who need a fast, easy design for consumer electronics or housekeeping supply. The reference design gives designers an 'instant supply' all ready to go."

Related IRIS Series Data Sheets, Application Notes and Design Tips

• IRIS4009 Integrated Switcher Data Sheet
• AN-1018A General Application Note for the IRIS Series Integrated Switchers
• AN-1024A Magnetics Design for IRIS Integrated Switchers
• AN-1025 Design a Power Supply Using the IRIS Series Integrated Switchers
• IRISMPS4 Reference Design, 15W AC-DC Flyback Power Supply Using the IRIS4009, Universal Input, 12V, 1A Output

Availability and Pricing

The IRISMPS4 reference design is available now. Pricing is US $245 each.