Product category:
Reference Designs
News Release from: International Rectifier | Subject: IRISMPS4
Edited by the Electronicstalk Editorial
Team on 25 January 2005
Design cuts flyback supplies down to
size
The IRISMPS4 is 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.
The IRISMPS4 is 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 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
This article was originally published on Electronicstalk on 15 Feb 2001 at 8.00am (UK)
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A dropping resistor from the DC bus initiates startup 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 with 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 adapters 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.
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