IRISMPS3 Datasheet | International Rectifier

Description The IRISMPS3 reference design is a plete tested power supply circuit. It is designed for a universal AC line input and will provide a 15V, 4A full load DC output. The design uses a flyback converter topology, with an IRIS4013K as the main switch and control device. The 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 es 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. Test Circuit Set-up Fig 1) Connections to the board viewed from the top board layout The circuit is designed for a universal AC line input. To safely test and evaluate this circuit it is remended 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. For the output the best load to use is an electronic load which will allow easy changes in the output load, e.g. 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 connection. Circuit Operation The front end of the circuit consists of an EMI Filter, a diode bridge rectifier, and a DC bus filter capacitor. These are all fairly mon circuit ponents used to create a DC voltage at the top end of the transformer....