Reference design for flyback AC-DC power supplies

11 August 2004 Power Electronics / Power Management

A 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, is offered by International Rectifier. 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 15 V, 4 A 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 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 30 W. It is claimed to handle over 60% more power than industry-standard 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%, says IR.

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