Design Example Report Title Low Line Only, High Efficiency (>87%) High Power Factor (>0.98), Low A-THD (<10%), 20 W Output Non-Isolated Buck Boost LED Driver Using LinkSwitchTM-PL LNK460KG Specification 85 VAC – 135 VAC Input; 85 VTYP, 235 mA Output Application T8 LED Lamp Author Applications Engineering Department Document Number DER-345 Date September 11, 2012 Revision 1.0 Summary and Features Low cost, low component count (parts), small size (height <8 mm) PF >0.98, % ATHD <6% at nominal input Highly energy efficient, >87% at nominal input Single-stage power factor correction and constant current (CC) output Integrated protection and reliability features Output short-circuit and open load protected Auto recovery thermal shutdown with hysteresis No damage during brown-out conditions Meets 1 kV differential line surge IEC 61000-4-5 ring wave, IEC 61000-3-2 C harmonics and EN55015 B conducted EMI compliant 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 <http://www.powerint.com/ip.htm>. Power Integrations 5245 Hellyer Avenue, San Jose, CA 95138 USA. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11-Sep-12 Table of Contents 1 2 3 4 Introduction ................................................................................................................. 3 Power Supply Specification ........................................................................................ 4 Schematic ................................................................................................................... 5 Circuit Description ...................................................................................................... 6 4.1 Input EMI Filtering ............................................................................................... 6 4.2 Power and Feedback Circuits.............................................................................. 6 4.3 Open Load Protection (Optional) ......................................................................... 6 5 PCB Layout ................................................................................................................ 8 6 Bill of Materials ........................................................................................................... 9 7 PIXls Design Spreadsheet ........................................................................................ 10 8 Performance Data .................................................................................................... 11 8.1 Efficiency ........................................................................................................... 11 8.2 Line and Load Regulation.................................................................................. 12 8.3 Power Factor ..................................................................................................... 13 8.4 A-THD ............................................................................................................... 14 8.5 Harmonic Content ............................................................................................. 15 8.5.1 80 V Output ................................................................................................ 15 8.5.2 85 V Output ................................................................................................ 16 8.5.3 90 V Output ................................................................................................ 17 8.6 Test Data ........................................................................................................... 18 8.6.1 Test Data, 80 V Output............................................................................... 18 8.6.2 Test Data, 85 V Output............................................................................... 18 8.6.3 Test Data, 90 V Output............................................................................... 18 8.6.4 115 VAC 60 Hz, 80 V Output, Harmonics Data .......................................... 19 8.6.5 115 VAC 60 Hz, 85 V Output, Harmonics Data .......................................... 20 8.6.7 115 VAC 60 Hz, 90 V Output, Harmonics Data .......................................... 21 9 Thermal Performance ............................................................................................... 22 10 Waveforms ............................................................................................................ 23 10.1 Input Voltage and Input Current at Normal Operation ....................................... 23 10.2 Output Current and Output Voltage at Normal Operation .................................. 24 10.3 Output Current/Voltage Rise and Fall ................................................................ 25 10.4 Input Voltage and Output Current Waveform at Start-up ................................... 26 10.5 Drain Waveforms at Normal Operation.............................................................. 27 10.6 Freewheeling Diode Waveforms at Normal Operation ...................................... 28 10.7 Inductor Current ................................................................................................ 29 10.8 Start-up Drain Voltage and Current ................................................................... 29 10.9 Drain Current and Drain Voltage During Output Short-Circuit ........................... 30 11 Conducted EMI ..................................................................................................... 31 12 Line Surge............................................................................................................. 32 13 Revision History .................................................................................................... 33 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 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 1 Introduction The document describes a non-isolated, high efficiency, high power factor (PF) LED driver designed to drive a nominal LED string voltage of 85 V at 235 mA from an input voltage range of 85 VAC to 135 VAC (47 Hz – 63 Hz). The LED driver utilizes the LNK460KG from the LinkSwitch-PL family of ICs. The topology used is a single-stage non-isolated buck boost that meets the stringent space and efficiency requirements for this design. LinkSwitch-PL based designs provide high power factor (>0.9) meeting international requirements. This document contains the LED driver specification, schematic, PCB details, bill of materials, transformer documentation and typical performance characteristics. Figure 1 – Populated Circuit Board (180 mm x 16.4 mm x 8 mm). Page 3 of 34 Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11-Sep-12 2 Power Supply Specification The table below represents the minimum acceptable performance of the design. Actual performance is listed in the results section. Description Input Voltage Frequency Output Output Voltage Output Current Total Output Power Continuous Output Power Efficiency Full Load Symbol Min Typ Max Units Comment VIN fLINE 85 115 135 VAC Hz 2 Wire – no P.E. VOUT IOUT 80 90 235 V mA 20 W 60 85 POUT 87 % Measured at 115 VAC input Environmental Conducted EMI CISPR 15B / EN55015B Safety Non-Isolated Ring Wave (100 kHz) Differential Mode (L1-L2) Differential Surge (L1-L2) Power Factor 2.5 1 0.95 ATHD Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Measured at VOUT(TYP), IOUT(TYP) and 115 VAC, 60 Hz 0.98 6 Harmonic Currents kV kV EN 61000-3-2 Class C % Measured at VOUT(TYP), IOUT(TYP) and 115 VAC, 60 Hz Class C Limits (For PIN >25 W Limit) Page 4 of 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 3 Schematic Figure 2 – Schematic. Page 5 of 34 Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11-Sep-12 4 Circuit Description The LinkSwitch-PL (U1) is a highly integrated primary-side controller intended for use in LED driver applications. The LinkSwitch-PL provides high power factor while regulating the output current across a range of input (85 VAC to 135 VAC) in a single conversion stage. The design also supports the output voltage variations typically encountered in LED driver applications. All of the control circuitry responsible for these functions plus the high-voltage power MOSFET is incorporated into the IC. 4.1 Input EMI Filtering Inductors L1, L2, L3 and C1, C2 filter the switching current presented by the buck converter to the line. Resistor R1, R2 and R3 across L1, L2 and L3 damp any resonances between the input inductors, capacitors and the AC line impedance which create peaks in the conducted EMI spectrum. MOV RV1 provides a clamp to limit the maximum voltage during differential line surge events. Zener diode VR1 is added to increase immunity to differential line surge, clamping at a lower voltage than the MOV. Bridge rectifier BR1 rectifies the AC line voltage with capacitor C1 and C2 providing a low impedance path (decoupling) for the primary switching current. A low value of capacitance (sum of C1 and C2) is necessary to maintain a power factor greater than 0.9. 4.2 Power and Feedback Circuits The circuit is configured as a buck-boost converter with the SOURCE (S) pin of U1 connected to the cathode of the freewheeling diode D2 through current sense resistors. The current sense resistors R4, R6, and R7 are used to sense the diode current in the buck-boost converter. The resistor value is adjusted to center the output current at 235 mA at nominal input voltage. Capacitors C4, C5 and R5 are used to filter the high frequency component of the diode current, which keep the LinkSwitch-PL operating point such that the average FEEDBACK (FB) pin voltage is 290 mV steady-state. The DRAIN (D) pin is connected to the positive side of the DC rectified input thru D1. Diode D1 is used to prevent reverse current from flowing through U1. Two low profile SMD inductors L5 and L6 are connected in series to share the thermal and current stresses. Capacitor C3 provides local decoupling for the BYPASS (BP) pin of U1 which is the supply pin for the internal controller. During start-up, C3 is charged to ~6 V from an internal high-voltage current source connected to the DRAIN pin Rectifier diodes D3 and D4 were selected to be low capacitance diodes to minimize the effect of the OVP circuit (D3, D4, VR2 and VR3) on the output regulation. 4.3 Open Load Protection (Optional) The LED driver is protected in the event of accidental open load operation (such as during production testing) by monitoring the voltage across the output inductor during energy decay (MOSFET off-time). Zener diodes VR2 and VR3 set the OVP threshold Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Page 6 of 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG which forces U1 to enter cycle-skipping mode. Resistor R8 is used to limit the maximum output voltage by partially discharging the output when the load is disconnected. This reduces efficiency during normal operation but also ensures the LEDs extinguish completely when the AC is removed. It is recommended to use higher than 120 V rated output capacitors if open load protection is required. Want More? Use your QR Code reader and you will be connected to related content on our website. Page 7 of 34 Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11-Sep-12 5 PCB Layout Figure 3 – Top Side. Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Figure 4 – Bottom Side. Page 8 of 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 6 Bill of Materials Total electrical components: 31 parts Item Qty Ref Des 1 1 BR1 Description 2 2 C1 C2 VJ1812Y104KXEAT Vishay 3 1 C3 1 F, 16 V, Ceramic, X5R, 0603 GRM188R61C105KA93D Murata 4 1 C4 10 F, 16 V, Ceramic, X5R, 0805 GRM21BR61C106KE15L Murata 5 1 C5 C1608X7R1C105M TDK 6 1 C6 UVZ2A101MPD Nichicon 7 1 C7 1 F 16 V, Ceramic, X7R, 0603 100 F, 100 V, Electrolytic, Gen. Purpose, (10 x 20) 47 nF, 310 VAC, Polyester Film, X2 8 1 D1 200 V, 3 A, DIODE SUPER FAST SMD, SMB DIODE ULTRA FAST 400 V 3 A, DO-214AB ES3G-E3/57T Vishay 250 V, 0.2 A, Fast Switching, 50 ns, SOD-323 BAV21WS-7-F Diodes, Inc. 507-1181 Belfuse Pulse Electronic 600 V, 1 A, Bridge Rectifier, SMD, DFS 100 nF, 500 V, Ceramic, X7R, 1812 Mfg Part Number Mfg DF06S-E3/45 Vishay BFC233920473 Vishay ES3DB-13-F Diodes, Inc. 9 1 D2 10 2 D3 D4 11 1 F1 12 3 L1 L2 L3 330 H, 600 mA P0752.334NLT 13 1 L4 150 H, 1.85 A SRR1280-151K Bourns 14 1 L5 120 H, 1.95 A 652-SRR1280-121K Bourns 15 4 R1 R2 R3 R5 3.3 k, 5%, 1/10 W, Thick Film, 0603 ERJ-3GEYJ332V Panasonic 16 1 R4 20 , 1%, 1/8 W, Thick Film, 0805 ERJ-6ENF20R0V Panasonic 17 1 R6 3.6 , 5%, 1/8 W, Thick Film, 0805 ERJ-6GEYJ3R6V Panasonic 18 1 R7 2.00 , 1%, 1/4 W, Thick Film, 1206 MCR18EZHFL2R00 Rohm 19 1 R8 510 k, 5%, 1/8 W, Thick Film, 0805 ERJ-6GEYJ514V Panasonic 20 1 RV1 21 1 U1 3.15 A, 250 V, Slow, RST 140 V, 12 J, 7 mm, RADIAL V140LA2P Littlefuse LinkSwitch-PL, eSOP-12P LNK460KG Power Integrations 22 1 VR1 350 V, 400 W, 5%, DO214AC (SMA) SMAJ350A LittleFuse 23 1 VR2 18 V, 5%, 150 mW, SSMINI-2 MAZS1800ML Panasonic 24 1 VR3 91 V, 5%, 500 mW, SOD-123 MMSZ5270BT1G On Semi Page 9 of 34 Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11-Sep-12 7 PIXls Design Spreadsheet ACDC_LinkSwitch-PLBuck-Boost_121211; INPUT Rev.1.0; Copyright Power Integrations 2011 ENTER APPLICATION VARIABLES VACMIN 85 VACNOM VACMAX FL VO_MIN 80.00 VO_NOM 85.00 VO_MAX 90.00 IO 0.235 n 0.87 Z INFO Enclosure OUTPUT UNIT 85 115 135 50 80.0 85.0 90.0 0.235 0.870 0.5 V V V Hz V V V A %/100 Retrofit Lamp PO VD 1.00 LinkSwitch-PL DESIGN VARIABLES Device LNK460 19.98 1 W V LNK460 TON 2.67 us FSW 122.8 kHz Duty Cycle 32.8 % VDRAIN 302 V 0.376 1.700 1.637 A A A IRMS IPK ILIM_MIN #REF! KDP 1.08 LinkSwitch-PL EXTERNAL COMPONENT CALCULATIONS RSENSE 1.234 Standard RSENSE 1.24 PSENSE 68.2 ENTER INDUCTOR CORE/CONSTRUCTION VARIABLES Core Type Fixed inductor Fixed inductor AE #N/A LE #N/A AL #N/A BW #N/A L 5 TRANSFORMER PRIMARY DESIGN PARAMETERS LP 270.00 270.0 LP Tolerance 5.00 5 Output Parameters IO 0.235 PIVD 402.5 ACDC_LinkSwitch-PL-BuckBoost_121211; LinkSwitch-PL BuckBoost Transformer Design Spreadsheet Minimum AC input voltage Nominal AC input voltage Maximum AC input voltage Minimum line frequency Minimum output voltage tolerance Nominal Output Voltage Maximum output voltage tolerance Average output current specification Total power supply efficiency Loss allocation factor Enclosure selections determine thermal conditions and maximum power. Enter "Retrofit Lamp" or "Open frame" Total output power Output diode forward voltage drop Chosen LinkSwitch-PL Device Expected on-time of MOSFET at low line and PO Expected switching frequency at low line and PO Expected operating duty cycle at low line and PO Estimated worst case drain voltage at VACMAX and VO_MAX Nominal RMS current through the switch #REF! Minimum device current limit Ratio between off-time of switch and reset time of core at VACNOM Ohms Ohms mW Output current sense resistor Closest 1% value for RSENSE Power dissipated by RSENSE mm^2 mm nH/T^2 mm Core Type Core Effective Cross Sectional Area Core Effective Path Length Ungapped Core Effective Inductance Bobbin Physical Winding Width Number of winding layers uH % Primary Inductance Tolerance of Primary Inductance A Expected Output Current Peak Inverse Voltage at VO_MAX on output diode V Note: 1) The peak current should be lower than typical current limit. 2) The measured PIVD is less than 350 V Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Page 10 of 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 8 Performance Data All measurements were taken at room temperature using an LED load. The following data were measured using 3 sets of loads to represent the output voltage load range of 80 V to 90 V. Refer to the table on Section 8.6 for the complete set of test data values. 8.1 Efficiency 88.5 80 V 88.0 85 V 90 V Efficiency (%) 87.5 87.0 86.5 86.0 85.5 85.0 80 85 90 95 100 105 110 115 120 125 130 135 Input Voltage (VAC) Figure 5 – Efficiency vs. Line and Load. Page 11 of 34 Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com 140 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG Line and Load Regulation 246 80 V 243 Output Current (mA) 8.2 11-Sep-12 85 V 90 V 240 237 234 231 228 225 222 80 85 90 95 100 105 110 115 120 125 130 135 140 Input Voltage (VAC) Figure 6 – Regulation vs. Line and Load. Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Page 12 of 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 8.3 Power Factor All greater than 0.95 PF across line input 0.999 80 V 0.997 85 V Power Factor 0.995 90 V 0.993 0.991 0.989 0.987 0.985 0.983 0.981 80 85 90 95 100 105 110 115 120 125 130 135 Input Voltage (VAC) Figure 7 – Power Factor vs. Line and Load. Page 13 of 34 Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com 140 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 8.4 11-Sep-12 A-THD 10 80 V 9 85 V 8 90 V A-THD (%) 7 6 5 4 3 2 1 0 80 85 90 95 100 105 110 115 Input Voltage (VAC) 120 125 130 135 140 Figure 8 – A-THD vs. Line and Load. Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Page 14 of 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 8.5 Harmonic Content The design met the limits for IEC 61000-3-2 C harmonics Class C equipment for an active input power of >25 W to be able to use several units in parallel. 8.5.1 80 V Output 35 Class C Limit 80 V Harmonic Content (%) 30 25 20 15 10 5 0 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 Harmonic Number (n) Figure 9 – 80 V Output. Input Current Harmonics (IEC 61000-3-2 Class C) at 115 VAC, 60 Hz. Page 15 of 34 Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11-Sep-12 8.5.2 85 V Output 35 Class C Limit 85 V Harmonic Content (%) 30 25 20 15 10 5 0 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 Harmonic Number (n) Figure 10 – 85 V Output. Input Current Harmonics (IEC 61000-3-2 Class C) at 115 VAC, 60 Hz. Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Page 16 of 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 8.5.3 90 V Output 35 Class C Limit 90 V Harmonic Content (%) 30 25 20 15 10 5 0 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 Harmonic Number (n) Figure 11 – 90 V Output. Input Current Harmonics (IEC 61000-3-2 Class C) at 115 VAC, 60 Hz. Page 17 of 34 Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11-Sep-12 8.6 Test Data All measurements were taken with the board at open frame, 25 ºC ambient, and 60 Hz line frequency. 8.6.1 Test Data, 80 V Output Input VAC Freq (VRMS) (Hz) 85 60 VIN (VRMS) 84.96 Input Measurement IIN PIN PF (mARMS) (W) 266.32 22.320 0.987 %ATHD 9.14 Load Measurement VOUT IOUT POUT (VDC) (mADC) (W) 80.3000 236.100 19.160 PCAL (W) 18.96 Calculation Efficiency (%) 85.84 Loss (W) 3.16 90 60 89.92 249.31 22.254 0.993 8.31 80.2000 237.300 19.230 19.03 86.41 3.02 100 60 99.95 217.73 21.676 0.996 6.38 80.2000 232.300 18.800 18.63 86.73 2.88 115 60 114.97 193.45 22.162 0.996 4.39 80.3000 239.100 19.370 19.20 87.40 2.79 135 60 134.97 164.08 22.013 0.994 5.11 80.2000 238.200 19.290 19.10 87.63 2.72 Load Measurement VOUT IOUT POUT (VDC) (mADC) (W) 84.6000 229.900 19.640 PCAL (W) 19.45 Calculation Efficiency (%) 85.93 Loss (W) 3.22 8.6.2 Test Data, 85 V Output Input VAC Freq (VRMS) (Hz) 85 60 VIN (VRMS) 84.96 Input Measurement IIN PIN PF (mARMS) (W) 271.71 22.856 0.990 %ATHD 7.84 90 60 89.92 259.69 23.182 0.993 6.4 84.7000 232.600 19.880 19.70 85.76 3.30 100 60 99.95 237.33 23.644 0.997 4.55 84.7000 241.700 20.640 20.47 87.29 3.00 115 60 114.97 203.39 23.308 0.997 4.09 84.6000 238.700 20.360 20.19 87.35 2.95 135 60 134.97 175.06 23.501 0.995 4.92 84.6000 241.300 20.580 20.41 87.57 2.92 Load Measurement VOUT IOUT POUT (VDC) (mADC) (W) 89.6000 227.200 20.510 PCAL (W) 20.36 Calculation Efficiency (%) 85.66 Loss (W) 3.43 8.6.3 Test Data, 90 V Output Input VAC Freq (VRMS) (Hz) 85 60 VIN (VRMS) 84.95 Input Measurement IIN PIN PF (mARMS) (W) 286.68 23.944 0.983 %ATHD 5.56 90 60 89.91 277.46 24.606 0.986 4.78 89.6000 235.000 21.220 21.06 86.24 3.39 100 60 99.95 245.01 24.420 0.997 3.57 89.6000 235.100 21.230 21.06 86.94 3.19 115 60 114.97 214.21 24.557 0.997 3.75 89.5000 237.900 21.470 21.29 87.43 3.09 135 60 134.97 183.98 24.713 0.995 4.6 89.6000 238.400 21.520 21.36 87.08 3.19 Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Page 18 of 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 8.6.4 115 VAC 60 Hz, 80 V Output, Harmonics Data Current harmonics limits from IEC 61000-3-2 Class C Page 19 of 34 V 115 Freq 60.00 I (mA) 193.45 P 22.1620 PF 0.9964 %THD 4.39 nth Order 1 2 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 mA Content 192.98 0.06 3.33 2.10 2.52 0.97 1.47 1.58 1.08 1.41 2.05 1.73 2.10 1.10 2.80 1.59 1.56 0.11 1.20 1.51 1.59 % Content Limit <25 W Limit >25 W Remarks 0.03% 1.73% 1.09% 1.31% 0.50% 0.76% 0.82% 0.56% 0.73% 1.06% 0.90% 1.09% 0.57% 1.45% 0.82% 0.81% 0.06% 0.62% 0.78% 0.82% 150.7016 84.2156 44.3240 22.1620 15.5134 13.1267 11.3765 10.0381 8.9814 8.1261 7.4195 6.8259 6.3203 5.8844 5.5048 5.1711 4.8756 4.6121 4.3756 2.00% 29.89% 10.00% 7.00% 5.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11-Sep-12 8.6.5 115 VAC 60 Hz, 85 V Output, Harmonics Data Current harmonics limits from IEC 61000-3-2 Class C V 115 Freq 60.00 I (mA) 203.39 P 23.3080 PF 0.9967 %THD 4.09 nth Order 1 2 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 mA Content 202.90 0.12 2.59 1.73 2.32 1.28 1.82 1.10 0.92 1.72 1.75 1.75 3.00 0.61 2.93 0.79 1.51 0.45 1.19 1.77 1.24 % Content Limit <25 W Limit >25 W Remarks 0.06% 1.28% 0.85% 1.14% 0.63% 0.90% 0.54% 0.45% 0.85% 0.86% 0.86% 1.48% 0.30% 1.44% 0.39% 0.74% 0.22% 0.59% 0.87% 0.61% 158.4944 88.5704 46.6160 23.3080 16.3156 13.8055 11.9648 10.5572 9.4459 8.5463 7.8031 7.1789 6.6471 6.1887 5.7894 5.4385 5.1278 4.8506 4.6018 2.00% 29.90% 10.00% 7.00% 5.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Page 20 of 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 8.6.7 115 VAC 60 Hz, 90 V Output, Harmonics Data Current harmonics limits from IEC 61000-3-2 Class C Page 21 of 34 V 115 Freq 60.00 I (mA) 214.21 P 24.5570 PF 0.9971 %THD 3.75 nth Order 1 2 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 mA Content 213.74 0.07 1.80 1.31 1.98 1.30 2.18 0.74 0.94 2.20 1.09 1.45 3.46 1.03 2.43 1.35 1.14 0.45 1.33 2.00 0.50 % Content Limit <25 W Limit >25 W Remarks 0.03% 0.84% 0.61% 0.93% 0.61% 1.02% 0.35% 0.44% 1.03% 0.51% 0.68% 1.62% 0.48% 1.14% 0.63% 0.53% 0.21% 0.62% 0.94% 0.23% 166.9876 93.3166 49.1140 24.5570 17.1899 14.5453 12.6059 11.1229 9.9520 9.0042 8.2213 7.5636 7.0033 6.5203 6.0996 5.7300 5.4025 5.1105 4.8484 2.00% 29.91% 10.00% 7.00% 5.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11-Sep-12 9 Thermal Performance Images captured after running for >30 minutes at room temperature (25 °C), no airflow, open frame at VIN = 115 VAC Figure 12 – Output Inductor: 71 ºC. Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Figure 13 – LNK460KG: 81.6 ºC. Page 22 of 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 10 Waveforms 10.1 Input Voltage and Input Current at Normal Operation Figure 14 – 90 VAC, 60 Hz Full Load. Upper: IIN, 200 mA / div. Lower: VIN, 100 V, 10 ms / div. Figure 15 – 100 VAC, 60 Hz Full Load. Upper: IIN, 200 mA / div. Lower: VIN, 100 V, 10 ms / div. Figure 16 – 115 VAC, 60 Hz Full Load. Upper: IIN, 200 mA / div. Lower: VIN, 100 V, 10 ms / div. Figure 17 – 135 VAC, 60 Hz Full Load. Upper: IIN, 200 mA / div. Lower: VIN, 100 V, 10 ms / div. Page 23 of 34 Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11-Sep-12 10.2 Output Current and Output Voltage at Normal Operation Figure 18 – 90 VAC, 60 Hz Full Load. Upper: IOUT, 200 mA / div. Lower: VOUT, 20 V, 10 ms / div. Figure 19 – 100 VAC, 60 Hz Full Load. Upper: IOUT, 200 mA / div. Lower: VOUT, 20 V, 10 ms / div. Figure 20 – 115 VAC, 60 Hz Full Load. Upper: IOUT, 200 mA / div. Lower: VOUT, 20 V, 10 ms / div. Figure 21 – 135 VAC, 60 Hz Full Load. Upper: IOUT, 200 mA / div. Lower: VOUT, 20 V, 10 ms / div. Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Page 24 of 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 10.3 Output Current/Voltage Rise and Fall Figure 22 – 90 VAC, 60 Hz Output Rise. Upper: IOUT, 200 mA / div. Lower: VOUT, 20 V, 100 ms / div. Figure 23 – 90 VAC, 60 Hz Output Fall. Upper: IOUT, 200 mA / div. Lower: VOUT, 20 V, 2 s / div. Figure 24 – 135 VAC, 60 Hz Output Rise. Upper: IOUT, 200 mA / div. Lower: VOUT, 20 V, 100 ms / div. Figure 25 – 135 VAC, 60 Hz Output Fall. Upper: IOUT, 200 mA / div. Lower: VOUT, 20 V, 2 s / div. Page 25 of 34 Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11-Sep-12 10.4 Input Voltage and Output Current Waveform at Start-up Figure 26 – 90 VAC, 60 Hz. Upper: IOUT, 200 mA / div. Lower: VIN, 100 V, 100 ms / div. Figure 27 – 100 VAC, 60 Hz. Upper: IOUT, 200 mA / div. Lower: VIN, 100 V, 100 ms / div. Figure 28 – 115 VAC, 60 Hz. Upper: IOUT, 200 mA / div. Lower: VIN, 200 V, 100 ms / div. Figure 29 – 135 VAC, 60 Hz. Upper: IOUT, 200 mA / div. Lower: VIN, 200 V, 100 ms / div. Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Page 26 of 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 10.5 Drain Waveforms at Normal Operation Figure 30 – 90 VAC, 60 Hz. Upper: IDRAIN, 1 A / div. Lower: VDRAIN, 100 V, 5 ms / div. Figure 31 – 90 VAC, 60 Hz. Upper: IDRAIN, 1 A / div. Lower: VDRAIN, 100 V, 5 s / div. Figure 32 – 135 VAC, 60 Hz. Upper: IDRAIN, 1 A / div. Lower: VDRAIN, 100 V, 5 ms / div. Figure 33 – 135 VAC, 60 Hz. Upper: IDRAIN, 1 A / div. Lower: VDRAIN, 100 V, 5 s / div. Page 27 of 34 Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11-Sep-12 10.6 Freewheeling Diode Waveforms at Normal Operation Figure 34 – 90 VAC, 60 Hz. Upper: IDRAIN, 1 A / div. Lower: VDRAIN, 100 V, 5 ms / div. Figure 35 – 90 VAC, 60 Hz. Upper: IDRAIN, 1 A / div. Lower: VDRAIN, 100 V, 5 s / div. Figure 36 – 135 VAC, 60 Hz. Upper: IDRAIN, 1 A / div. Lower: VDRAIN, 100 V, 5 ms / div. Figure 37 – 135 VAC, 60 Hz. Upper: IDRAIN, 1 A / div. Lower: VDRAIN, 100 V, 5 s / div. Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Page 28 of 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 10.7 Inductor Current Figure 38 – 90 VAC, 60 Hz. IDRAIN, 1 A / div. Figure 39 – 135 VAC, 60 Hz. IDRAIN, 1 A / div. 10.8 Start-up Drain Voltage and Current Figure 40 – 90 VAC, 60 Hz. Upper: IDRAIN, 500 mA / div. Lower: VDRAIN, 100 V, 50 ms / div. Page 29 of 34 Figure 41 – 135 VAC, 60 Hz. Upper: IDRAIN, 500 mA / div. Lower: VDRAIN, 100 V, 50 ms / div. Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11-Sep-12 10.9 Drain Current and Drain Voltage During Output Short-Circuit Figure 42 – 90 VAC, 60 Hz Output Short Condition. Upper: IDRAIN, 500 mA / div. Lower: VDRAIN,100 V, 5 ms / div. Figure 43 – 90 VAC, 60 Hz Output Short Condition. Upper: IDRAIN, 500 mA / div. Lower: VDRAIN, 100 V, 50 s / div. Figure 44 – 135 VAC, 60 Hz Output Short Condition. Upper: IDRAIN, 500 mA / div. Lower: VDRAIN, 100 V, 5 ms / div. Figure 45 – 135 VAC, 60 Hz Output Short Condition. Upper: IDRAIN, 500 mA / div. Lower: VDRAIN, 100 V, 50 s / div. Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Page 30 of 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11 Conducted EMI The unit was tested using LED load (85 V) with input voltage of 115 VAC, 60 Hz at room temperature. Figure 46 – Conducted EMI 85 V / 235 mA Load, 115 VAC, 60 Hz, and EN55015 Limits. Page 31 of 34 Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11-Sep-12 12 Line Surge Input voltage was set at 115 VAC / 60 Hz. Output was loaded with 85 V LED string and operation was verified following each surge event. Differential input line 1.2 / 50 s surge testing was completed on one test unit to IEC61000-4-5. Surge Level (V) 10 Strikes / Condition +1000 -1000 +1000 -1000 Input Voltage (VAC) Injection Location Injection Phase (°) Test Result (Pass/Fail) 115 115 115 115 L to N L to N L to N L to N 0 0 90 90 Pass Pass Pass Pass Differential input line ring surge testing was completed on one test unit to IEC61000-4-5. Surge Level (V) 10strikes/condition +2500 -2500 +2500 -2500 Input Voltage (VAC) 115 115 115 115 Power Integrations, Inc. Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com Injection Location L to N L to N L to N L to N Injection Phase (°) 0 0 90 90 Test Result (Pass/Fail) Pass Pass Pass Pass Page 32 of 34 11-Sep-12 DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 13 Revision History Date 11-Sep-12 Page 33 of 34 Author DK Revision 1.0 Description and Changes Initial Release Reviewed Apps & Mktg Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com DER-345 T8 20 W / 85 V LED Driver Using LNK460KG 11-Sep-12 For the latest updates, visit our website: www.powerint.com 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. POWER INTEGRATIONS MAKES NO WARRANTY HEREIN AND SPECIFICALLY DISCLAIMS ALL WARRANTIES INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS. 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 http://www.powerint.com/ip.htm. The PI Logo, TOPSwitch, TinySwitch, LinkSwitch, DPA-Switch, PeakSwitch, CAPZero, SENZero, LinkZero, HiperPFS, HiperTFS, HiperLCS, Qspeed, EcoSmart, Clampless, E-Shield, Filterfuse, StackFET, PI Expert and PI FACTS are trademarks of Power Integrations, Inc. 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