RDK-252 Power Integrations

Reference Design Report for Active Discharging of the X Capacitor for Reduced Title No-load Power Consumption Using CAPZero CAP014DG Specification 85 VAC 264 VAC Input Application General Purpose Author Applications Engineering Department Document RDR-252 Number Date April 14, 2010 Revision 1.0 Summary and Features Very low no-load input power (<5 mW actual dissipation) Passes surge testing to EN6100-4-5 Class 4 (2 kV DM / 4 kV CM) Safely discharges the X capacitor with a time constant of less than 1 second. PATENT INFORMATION The products and applications illustrated herein (including transformer construction and circuits external to the products) may be covered by one or more U.S. and foreign patents, or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A complete list of Power Integrations patents may be found at www.powerint.com. Power Integrations grants its customers a license under certain patent rights as set forth at <RDR-252 - CAPZero Reference Design Board 14-Apr-10 Table of Contents 1 Introduction.................................................................................................................3 2 Specification ...............................................................................................................4 3 Schematic...................................................................................................................5 4 Circuit Description ......................................................................................................6 5 PCB Layout ................................................................................................................7 6 Bill of Materials ...........................................................................................................8 7 No-load Input Power Performance .............................................................................9 7.1 CAPZero IC Consumption (X Capacitor + MOV Removed From Board)...........10 7.2 No-load Consumption Including Effect of X Capacitor and MOV.......................11 7.3 No-load Input Power Including MOV and CAPZero (X Capacitor Removed) ....12 8 X Capacitor Discharge Waveforms...........................................................................13 8.1 AC Disconnect at Room Temperature...............................................................13 o 8.2 AC Disconnect at 105 C Ambient.....................................................................13 o 8.3 AC Disconnect at -5 C Ambient .......................................................................14 8.4 Input Arcing Test Room Temperature ...............................................................15 o 8.5 AC Input Arcing Test at 105 C Ambient ...........................................................17 o 8.6 AC Input Arcing Test at -5 C Ambient ..............................................................19 9 AC Surge and Ring Wave Test.................................................................................21 9.1 Ring Wave Test.................................................................................................21 9.2 Differential Mode Surge, 1.2 / 50 sec ..............................................................21 9.3 Common Mode Surge, 1.2 / 50 sec.................................................................21 9.4 AC Disconnect Test After Surge........................................................................22 10 EMI Tests..............................................................................................................23 11 Revision History....................................................................................................25 Important Note: Although this board is designed to satisfy safety isolation requirements, the engineering prototype has not been agency approved. Therefore, all testing should be performed using an isolation transformer to provide the AC input to the prototype board. Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Page 2 of 26