IRISMPS3 International Rectifier, IRISMPS3 Datasheet - Page 2

• Manufacturer Part Number: IRISMPS3
• Description: International Rectifier Kansas Street El Segundo CA 90245 USA
• Manufacturer: International Rectifier

line input and will provide a 15V, 4A full load DC output.
initial start-up current for the IRIS4013K is provided by a dropper resistor from the DC bus. Once the circuit is
started the Vcc power for the IRIS4013K 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 IRIS4013K. The secondary voltage control loop uses an LM431
precision shunt regulator as the reference and an optocoupler to feedback the information across the transformer
galvanic isolation boundary back to the control circuit of the IRIS4013K.
that an isolation transformer or a synthesized and isolated AC source (such as a Pacific Power Source 115-ASX)
is used to power the board, with a voltage in the range of 90-265VAC, with a frequency of 50/60Hz. The AC input
signal is applied to the pins at P1 and P3 marked on the board.
something like a Chroma 63102. Another simple alternative is to use a High power resistor for the load. The output
connection are as follows: P2 is the Positive output voltage connection, P4 is the negative(or return) output con-
nection.
These are all fairly common circuit components used to create a DC voltage at the top end of the transformer.
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Circuit Description
The IRISMPS3 reference design is a complete tested power supply circuit. It is designed for a universal AC
The design uses a flyback converter topology, with an IRIS4013K as the main switch and control device. The
Test Circuit Set-up
The circuit is designed for a universal AC line input. To safely test and evaluate this circuit it is recommended
For the output the best load to use is an electronic load which will allow easy changes in the output load, e.g.
Circuit Operation
The front end of the circuit consists of an EMI Filter, a diode bridge rectifier, and a DC bus filter capacitor.
At power up the DC voltage is applied to the top of the transformer, and the top of resistor R2. R2 and R3 allow
Fig 1) Connections to the board viewed from the top board layout
IRISMPS3
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