/a>led” title=”led”>led” title=”led”>led circuit diagram, the entire bill of materials required to build the supply, extensive documentation of the power transformer, along with test data and waveform plots of the most important electrical waveforms. This report describes a universal input, 5 V, 1000 mA and 18 V, 670 mA isolated flyback converter employing LNK6774V from the LinkSwitch-HP family of ICs. It contains the complete specification of the power supply, a detailed circuit diagram, the entire bill of materials required to build the supply, extensive documentation of the power transformer, along with test data and waveform plots of the most important electrical waveforms. This report describes a universal input, 5 V, 1000 mA and 18 V, 670 mA isolated flyback converter employing LNK6774V from the LinkSwitch-HP family of ICs. It contains the complete specification of the power supply, a detailed circuit diagram, the entire bill of materials required to build the supply, extensive d ocumentation of the power transformer, along with test data and waveform plots of the most important electrical waveforms.

17W Dual Output Flyback Converter Reference Design Key Features and Specifications:

 Primary side regulated isolated flyback converter with ±5% regulation.

 132 kHz switching frequency for small transformer and output filter size

 Full load continuous conduction mode operation for improved efficiency and reduced output capacitor ripple currents

 Multi-mode operation maximizes efficiency over full load range

 Below 100 mW power consumption with 50 mW standby load at 230 VAC.

 Extensive protection features including OVP, OTP, brown-in/out, line overvoltage, and lost-regulation (auto-restart)

 Meets EN-550022 and CISPR-22 Class B conducted EMI with 5 dB margin.

 Meets IEC61000-4-5 1 kV / 2 kV surge.


Figure 3. 17W Converter Reference Design Outline Drawing
17W converter reference design main performance indicators:


Figure 4. 17W Converter Reference Design Circuit Diagram

17W Converter Reference Design Bill of Materials:

Figure 5. 17W Converter Reference Design Transformer Circuit Diagram


Figure 6. 17W Converter Reference Design PCB Layout
For details, see:
http://www.powerint.com/sites/default/files/product-docs/linkswitch-hp_family_datasheet.pdf
and
http://www.powerint.com/sites/default/files/PDFFiles/rdr321.pdf