Design Example Report Title 2W Non-isolated Power Supply using LNK305P Specification Input: 85-265VAC Output: 15V/130mA (220mApk) Application Motor Control Author Power Integrations Applications Department Document Number DER-47 Date April 20, 2005 Revision 1.0 Summary and Features • • • • • • Highly integrated solution Lowest possible component count No optocoupler or zener diode required for regulation Thermal overload protection with automatic recovery Less then 300mW no-load consumption Very high efficiency at full load The products and applications illustrated herein (including circuits external to the products and transformer construction) 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 5245 Hellyer Avenue, San Jose, CA 95138 USA. Applications Hotline: Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com DER-47 LNK305 Single Output Supply April 20, 2005 Table Of Contents 1 2 3 4 Introduction ................................................................................................................ 3 Power Supply Specification........................................................................................ 3 Schematic .................................................................................................................. 4 Circuit Description ...................................................................................................... 4 4.1 Bill Of Materials................................................................................................... 5 5 Performance Data ...................................................................................................... 5 5.1 Efficiency............................................................................................................. 6 5.2 Regulation........................................................................................................... 6 5.2.1 Line regulation ............................................................................................. 6 5.2.2 Load regulation ............................................................................................ 7 5.2.3 No-load input power..................................................................................... 7 6 Output noise measurements ...................................................................................... 8 7 Revision History ......................................................................................................... 8 Important Note: This board is designed to be non-isolated. Please take necessary safety precautions. Design Reports contain a power supply design specification, schematic, bill of materials, and transformer documentation. Performance data and typical operation characteristics are included. Typically only a single prototype has been built. Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com Page 2 of 9 DER-47 LNK305 Single Output Supply April 20, 2005 1 Introduction This document is a prototype engineering report describing a 15V, 130mA non-isolated power supply using a LNK305P from Power Integrations. This document contains the power supply specification, schematic, bill of materials and measurements results. 2 Power Supply Specification Description Input Voltage Frequency Outputs Output Voltage Output Ripple Voltage Output Current Total Output Power Continuous Output Power Peak Output Power Ambient Temperature Symbol Min Typ Max Units VIN fLINE 85 47 50/60 265 63 VAC Hz 150 220 V mV mA VOUT VRIPPLE IOUT 130 POUT 1.95 15 POUT_PEAK TAMB 0 Comment [±3%] 20 MHz Bandwidth W 3.3 W 70 o C Open frame Table 1 - Power Supply Specification Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com Page 3 of 9 DER-47 LNK305 Single Output Supply April 20, 2005 3 Schematic R1 HV-DC BP C1 100nF R3 2k2 1% C3 470nF 50V D2 1N4005 L1 S D EN 16k9 1% 1mH 220mArms U1 LNK305P D1 UF4005 C2 100uF 35V N +15V 130mA R4 3k9 0.5W RTN Figure 1 - Schematic after AC rectification 4 Circuit Description The tested power supply had an input stage including one diode for the rectification and a π filter (4.7uF, 1mH, 4.7uF), but this stage is not included in the schematic, and may not be needed in other systems if EMI filtering is present. The voltage across L1 is rectified and smoothed by D1 and C2 during U1’s off-time. To a first order, the forward voltage drop of D2 (slow diode used in the tests) and D1 (must be an ultrafast) can be considered similar. Therefore the voltage across C4 tracks the output voltage. The voltage across C3 is sensed and regulated via the resistor divider R1-R3 connected to U1’s EN-pin. Resistor R4 provides a small pre-load current (3.8mA) for operation down to 0mA output current. Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com Page 4 of 9 DER-47 4.1 LNK305 Single Output Supply April 20, 2005 Bill Of Materials Item 1 2 3 4 5 6 7 8 9 10 Reference R1 R3 R4 L1 C1 C2 C3 D1 D2 U1 Description/part number 16k9, 1%, 0.25W 2k2, 1%, 0.25W 3k9, 5%, 0.5W 1mH, 220mArms 100nF 100uF, 35V, low ESR 0.47uF, 50V UF4005 (ultrafast diode) 1N4005 (normal p/n diode) LNK305 Manufacturer Tokin Vishay Vishay Power Integrations Table 2 - SMPS Bill of Materials 5 Performance Data All measurements performed at room temperature, 50 Hz input frequency. Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com Page 5 of 9 DER-47 5.1 LNK305 Single Output Supply April 20, 2005 Efficiency 79.0 77.0 75.0 73.0 71.0 69.0 67.0 65.0 90 150 210 peak load 270 nominal load Figure 2 – Efficiency measurements vs input voltage (@130mA and 220mA load) 5.2 Regulation 5.2.1 Line regulation 110.0 105.0 100.0 95.0 90.0 90 150 no load 210 130mA load 270 220mA load Figure 3 – Output voltage tolerance (in % of the nominal output voltage level) vs input voltage, @ 0, 130mA and 220mA load Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com Page 6 of 9 DER-47 LNK305 Single Output Supply April 20, 2005 5.2.2 Load regulation 110.00 105.00 90Vac input 100.00 265Vac input 95.00 90.00 0 50 100 150 200 Figure 4 - Load regulation (in % of the nominal output voltage level) 5.2.3 No-load input power Input power (mW) 300.0 200.0 100.0 0.0 90 140 190 240 Figure 5 - No-load input power vs input voltage Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com Page 7 of 9 DER-47 LNK305 Single Output Supply April 20, 2005 6 Output noise measurements Figure 6 - Output ripple @ 230Vac input and 130mA load 7 Revision History Date April 20, 2005 Author TP Revision 1.0 Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com Description & changes Initial release Reviewed VC/JC / AM Page 8 of 9 DER-47 LNK305 Single Output Supply April 20, 2005 For the latest updates, visit our Web site: www.powerint.com PATENT INFORMATION Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability. Power Integrations does not assume any liability arising from the use of any device or circuit described herein, nor does it convey any license under its patent rights or the rights of others. The products and applications illustrated herein (including circuits external to the products and transformer construction) 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. The PI Logo, TOPSwitch, TinySwitch, LinkSwitch, and EcoSmart are registered trademarks of Power Integrations. PI Expert and DPA-Switch are trademarks of Power Integrations. © Copyright 2003, Power Integrations. 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