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Design Example Report
Title Specification Application Author Document Number Date Revision 2.4 W Power Supply using LNK520P Input: 85 - 265 VAC Output: 5.0 V / 480 mA Cell Phone Charger Power Integrations Applications Department DER-75 September 12, 2005 1.0
Summary and Features * * * * * * Low Cost, Low Component Count Design High Efficiency (> 70 %) at Full Load Accurate Output Voltage Regulation (using Opto-Coupler Feedback) Low Standby Consumption (< 250 mW) Meets EMI Without Y-capacitor Small Low Cost EE13 Transformer
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.
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DER-75
2.4W Power Supply using LNK520P
September 12, 2005
Table Of Contents
1 2 Introduction................................................................................................................. 3 Power Supply Specification ........................................................................................ 4 3 Schematic................................................................................................................... 5 4 Circuit Description ...................................................................................................... 6 4.1 Input EMI Filtering ............................................................................................... 6 4.2 LinkSwitch Primary.............................................................................................. 6 4.3 Output Rectification ............................................................................................. 6 4.4 Output Feedback................................................................................................. 6 4.5 No Load Consumption......................................................................................... 6 5 PCB Layout ................................................................................................................ 7 6 Bill Of Materials .......................................................................................................... 8 Transformer Specification.................................................................................................. 9 6.1 Electrical Diagram ............................................................................................... 9 6.2 Electrical Specifications....................................................................................... 9 6.3 Materials.............................................................................................................. 9 6.4 Transformer Build Diagram ............................................................................... 10 6.5 Transformer Construction.................................................................................. 10 7 Transformer Spreadsheets....................................................................................... 11 8 Performance............................................................................................................. 13 8.1 Efficiency........................................................................................................... 13 8.2 No-Load Input Power ........................................................................................ 13 8.3 Regulation ......................................................................................................... 14 8.4 Measurement Data............................................................................................ 15 9 Waveforms ............................................................................................................... 16 9.1 Drain Voltage and Current, Normal Operation .................................................. 16 9.2 Load Transient Response (75% to 100% Load Step) ....................................... 17 9.3 Output Ripple Measurements............................................................................ 18 9.3.1 Ripple Measurement Technique ................................................................ 18 9.3.2 Measurement Results ................................................................................ 19 10 Conducted EMI ..................................................................................................... 20 11 Revision History.................................................................................................... 22
Important Notes: 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 isolated source to provide power to the prototype board. 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.
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DER-75
2.4W Power Supply using LNK520P
September 12, 2005
1 Introduction
This document is an engineering prototype report describing a cell phone power supply utilizing a LNK520P. This power supply is intended as a general-purpose evaluation platform for this LinkSwitch device. The document contains the power supply specification, schematic, bill of materials, transformer documentation, printed circuit layout, and performance data.
Figure 1 - Populated Circuit Board Photograph
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DER-75
2.4W Power Supply using LNK520P
September 12, 2005
2 Power Supply Specification
Description Input Voltage Frequency No-load Input Power (230 VAC) Output Output Voltage 1 Output Ripple Voltage 1 Output Current 1 Total Output Power Continuous Output Power Peak Output Power Efficiency Environmental Conducted EMI Safety Surge
Meets CISPR22B / EN55022B Designed to meet IEC950, UL1950 Class II
Symbol VIN fLINE
Min 85 47
Typ
Max 265 64 0.3 4.5 580
Units VAC Hz W V mV mA W W %
Comment
2 Wire - no P.E.
50/60
VOUT1 VRIPPLE1 IOUT1 POUT POUT_PEAK
5.5 380
5.0 480 2.4
5% 20 MHz bandwidth 25%
70
Measured at POUT (43 W), 25 oC
2
kV
Surge Ambient Temperature TAMB
2 0 50
kV
o
1.2/50 s surge, IEC 1000-4-5, Series Impedance: Differential Mode: 2 Common Mode: 12 100 kHz ring wave, 500 A short circuit current, differential and common mode Free convection, sea level
C
Regualtion Specification
7 6 5 Voltage (V) 4 3 2 1 0
0 100 200 300 400 500 600
MIN MAX
Load (mA)
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DER-75
2.4W Power Supply using LNK520P
September 12, 2005
3 Schematic
Figure 2 - Schematic
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DER-75
2.4W Power Supply using LNK520P
September 12, 2005
4 Circuit Description
4.1 Input EMI Filtering Resistor RF1 acts as a fuse for the entire power supply and also limits different surge. Diodes D1, D3, D5, D7 and Capacitors C5, C6 rectify and filter the input waveform to produce a high voltage DC-bus. Inductors L1 and L3 work in conjunction with C5 and C6 to filter and attenuate conducted EMI. 4.2 LinkSwitch Primary Diode D10 and capacitor C12 rectify and filter the bias voltage. The diode is in a low-side configuration to allow the bias-winding to act as a primary cancellation winding. Components C3, R3, R4, and D4 form an RCD clamp to capture the leakage spike at Drain turn-off. A slow diode (D4) is used to allow recovery of some of this leakage inductance energy. The remainder is captured in C3 and dissipated in R3. 4.3 Output Rectification Output diode D2 and capacitor C7 rectify and filter the output voltage. 4.4 Output Feedback Resistor R9 is used to bias the Zener reference (VR1), adjusting this resistor will adjust the output voltage. Resistor R10 is used to control the opto-coupler current, and depending on the value can also change the output voltage set-point. The opto-coupler U2 transfers the feedback signal across the isolation barrier to the primary side of the supply. Resistor R6 set's the maximum power point before the supply transitions into constant current mode. 4.5 No Load Consumption No-load consumption is affected by the choice of bias winding components. Use of a slow diode (1N4005GP) makes no-load consumption worse (by about 50mW at low-line), but gives the best CC regulation. Use of a fast diode D6 (such as 1N914) on the bias winding dramatically improves no-load consumption. However use of a fast diode also makes the constant-current (CC) regulation significantly non-linear. The absence of an RC snubber on the bias-winding, slightly improves the no-load consumption (10mW at lowline). Also the choice of Zener current setting resistor R9 affects the no-load consumption (again by approx 10mW at low-line). The value of resistor R7 has no effect on the no-load consumption. The set-point of the output voltage has a significant effect on the no-load consumption (high output voltage, higher no-load consumption) - e.g. going from Vout = 5.44 V to Vout = 6.5 V, the no-load consumption increased by 50mW.
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DER-75
2.4W Power Supply using LNK520P
September 12, 2005
5 PCB Layout
Figure 3 - Printed Circuit Layout
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DER-75
2.4W Power Supply using LNK520P
September 12, 2005
6 Bill Of Materials
Item Quantity 1 Part Reference Description CAP 470pF 100V CERM CHIP X7R 1 C3 0805 SMD Cap,Al Elect,4.7uF,400V,8mmX11.5mm,Sam Young 2 C5 C6 Cap,Al Elect,330uF,16V,8mmX11.5mm,KZE Series,NIPPON CHEMI-CON 1 C7 CAP 0.22uF 25V CERM CHIP X7R 0805 1 C10 SMD 1 C12 D1 D3 D5 5 D7 D10 1 D2 1 D4 2 J1 J2 2 J3 J4 2 L1 2 L3 1 R3 1 R4 1 R6 1 R7 1 R9 1 R10 1 RF1 1 T1 1 U1 1 U2 1 VR1 Cap,Cer, 1.0 uF, 50V, 10% Rectifier GPP 600V 1A DO-41 Diode Schottky 60V 1.1A DO-41 Rectifier GPP 1000V 1A DO-41 Terminal,1Pin,22AWG Terminal,1Pin,18AWG Part Number 20-00205-00 Mfg Part Number ECUV1H471KBN SHD400WV 4.7uF KZE16VB331MH 11LL ECJ2YB1E224K ECUS1H105KBB 1N4005-T 11DQ06 1N4007GDICT
2
20-00434-00
3 4 5 6 7 8 10 11 12 12 13 14 15 16 17 18 19 20 21 22 23
20-00014-00 20-00237-00 20-00308-00 15-00089-00 15-00153-00 TMP-59 35-00008-00 35-00007-00
CHOKE,1mH,SBCP_47HY102B,TOKIN 30-00018-00 CHOKE,FERRITE BEAD Res,150K 1/16W 5% 0603 SMD Res,300 1/10W 5% 0805 SMD Res,7.50K 1/16W 1% 0603 SMD Res,15 1/16W 5% 0603 SMD Res,680 1/16W 5% 0603 SMD Res,120 1/16W 5% 0603 SMD Res, 8.2 ,1W, 5%, Metal Film BEE16_H_LOPROFILE_10P IC,LNK 520P,CV or CV/CC SWITCHER,PLAS,DIP-8B IC,PC817D,PHOTOCOUPLER TRAN OUT 4-DIP DIODE ZENER 4.7V 500MW MINIMELF 05-01740-00 05-01506-00 05-01162-00 05-01644-00 05-01684-00 05-01666-00 05-02802-00 25-00061-00 TMP-111 45-00008-00 15-00188-00
SBCP_47HY102 B ERJ3GEYJ154V ERJ6GEYJ301V ERJ-3EKF7501V ERJ3GEYJ150V ERJ3GEYJ681V ERJ3GEYJ121V RSF200JB0R8.2
LNK520P PC817D ZMM5230B-7
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DER-75
2.4W Power Supply using LNK520P
September 12, 2005
Transformer Specification
6.1 Electrical Diagram
2 W1: 39T 1 x 34 AWG 1 3 W2: 114T 1 x 35 AWG 4 3 W3: 13T 2 x 31 AWG FL1 W4: 12T 1 x 26 TIW 8 7
Figure 4 - Transformer Electrical Diagram
6.2
Electrical Specifications
1 second, 60 Hz, from Pins 2-1,3-4 to Pins 6-5 Pins 4-3, all other windings open, measured at 100 kHz, 0.4 VRMS Pins 4-3, all other windings open Pins 4-3 with Pins 7-8 shorted, measured at 100 kHz, 0.4 VRMS 3000 VAC 2390 H, 0/+20% 300 kHz (Min.) 100 H (Max.)
Electrical Strength Primary Inductance Resonant Frequency Primary Leakage Inductance
6.3
Materials
Description Core: TDK PC40 EE13, AL = 185 nH/T Bobbin: EE13 Horizontal Magnet Wire: 34 AWG Magnet Wire: 35 AWG Magnet Wire: 31 AWG Triple Insulated Wire: 26 AWG (TIW) Tape Varnish
2
Item [1] [2] [3a] [3b] [3c] [3d] [4a] [6]
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DER-75
2.4W Power Supply using LNK520P
September 12, 2005
6.4
Transformer Build Diagram
8 7 3 FL1 3
W4 Secondary Tape
W3 Shield Floating Tape
W2 Primary 4 Tape 2 1 W1 Cancellation
Figure 5 - Transformer Build Diagram.
6.5
Transformer Construction
Shield 1 Basic Insulation Primary Basic Insulation Shield 2 Basic Insulation Secondary Winding Outer Wrap Final Assembly Start at Pin 1. Wind 39 turns of item [3a] in approximately 1 layer. Finish at Pin 2. Use two layers of item [6] for basic insulation. Start at Pin 4. Wind 114 turns of item [3b] in approximately 3 layers. After st 1 layer insert one layer of tape. Complete 2nd layer insert one layer of rd tape. Complete 3 layer. Finish at Pin 3. Use two layers of item [6] for basic insulation. Temporary start at Pin 2. Wind 13 turns of bifilar item [3c]. Spread turns evenly across bobbin. Finish at Pin 3. (Disconnect from pin 2 and leave floating (FL1) in the stack.) Use one layer of item [7] for basic insulation. Temporary start at pin 2. Wind 12 turns of item [3d] in 1 layer. Finish on Pin 8. Move connection from pin 2 to pin 7. Wrap windings with 3 layers of tape [item [4a]. Assemble and secure core halves. Varnish dip (item [6]).
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DER-75
2.4W Power Supply using LNK520P
September 12, 2005
7 Transformer Spreadsheets
LinkSwitch (LNK52X) 030404; Rev.1.7; Copyright Power Integrations 2004
INPUT 85 265 50 5 0.48 20 3 9.4
INFO
OUTPUT UNIT Volts Volts Hertz Volts Amps
LinkSwitch (LNK52X) 030404 Rev.1.7; Copyright Power Integrations 2004
ENTER APPLICATION VARIABLES
VACMIN VACMAX fL VO IO VBIAS tC CIN
DI-75 - 042304A
Minimum AC Input Voltage Maximum AC Input Voltage AC Mains Frequency Output Voltage Continuous Nominal Output current Bias voltage (recommended default 20V, minimum 16V) Bridge Rectifier Conduction Time Estimate Input Filter Capacitor
msec uFarads
ESTIMATED LOSSES
PCORE RCLAMP ESR RSEC 146.3907 mW 200 Kohm 0.15 Ohms 0.2 Ohms Estimated Core Losses at peak Flux Density (BP) Primary clamp resistor (recommended default clamp resistor, RCLAMP) Output Capacitor ESR Estimated Resistance of transformer secondary winding.
DC INPUT VOLTAGE PARAMETERS
VMIN VMAX 97.50129 Volts 374.7666 Volts Minimum DC Input Voltage Maximum DC Input Voltage
ENTER OUTPUT CABLE PARAMETERS
RCABLE VCABLE 0.3 Ohms 0.144 Volts Resistance of total length of cable from power supply terminals to load and back. Drop along cable connecting power supply to load
ENTER LinkSwitch & OUTPUT DIODE VARIABLES
LinkSwitch I^2 f VOR VLEAK VD VR ID 0.56 54
LNK520
Universal 115 Doubled/230 Power 5.5 3.5 I^2 f (typical) co-efficient for LinkSwitch 2710 A^2 Hz 54 Volts 2 Volts 0.56 Volts 60 Volts Amps Reflected Output Voltage (401.1
DISCONTINUOUS MODE CHECK
KDP TON TDON 1.531793 6.587284 us 11.24319 us Ensure KDP > 1.15 for discontinuous mode operation. Linkswitch conduction time Secondary Diode conduction time
VOLTAGE STRESS ON LinkSWITCH AND OUTPUT DIODE
VDRAIN PIVS 508.1666 Volts 44.58646 Volts Maximum Drain Voltage Estimate (Includes Effect of Leakage Inductance) Output Rectifier Maximum Reverse Voltage
CURRENT WAVEFORM SHAPE PARAMETERS
DMAX IAVG IRMS 0.276666 0.035137 Amps 0.077135 Amps Maximum Operating Duty Cycle Average Primary Current Primary RMS Current
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DER-75
2.4W Power Supply using LNK520P
September 12, 2005
ENTER TRANSFORMER CORE/CONSTRUCTION VARIABLES
Core Type Core Bobbin AE LE AL VE BW KCORE
EE13
PC40EE13-Z BE-13 0.171 3.02 1130 517 7.4 551.5424 cm^2 cm nH/T^2 mm^3 mm kW/m^3 Core Effective Cross Sectional Area Core Effective Path Length Ungapped Core Effective Inductance Effective Core Volume Bobbin Physical Winding Width Core losses per unit volume Estimated transformer efficiency. T(n)=(PSCU+PCORE/2)/POEFF. Re-iterate with n = 0.9147 Safety Margin Width Number of Secondary Turns
T(n) M NS
0.9 12
0.9 0 mm
TRANSFORMER PRIMARY DESIGN PARAMETERS
dLP LP L LBIAS NP NB ALG BP LG OD DIA AWG CMA AWG_BIAS 1.003 2390.284 3 1 113.6045 36.28176 185.2075 3445.212 0.097008 uHenries Constant to account for reduction of inductance at higher flux densities. (0.9993 1
nH/T^2 Gauss mm
0.195415 mm 0.154132 mm 35 AWG
414.8576 Cmils/Amp Primary Winding Current Capacity (200 < CMA < 500) 32 AWG
TRANSFORMER SECONDARY DESIGN PARAMETERS
ISP ISRMS IRIPPLE AWGS DIAS ODS INSS VSEC 2.404628 Amps 0.954018 Amps 0.82447 Amps 30 AWG 0.256342 mm 0.616667 mm 0.180162 mm 0.096 Volts Peak Secondary Current Secondary RMS Current Output Capacitor RMS Ripple Current Secondary Wire Gauge (Rounded up to next larger standard AWG value) Secondary Minimum Bare Conductor Diameter Secondary Maximum Insulated Wire Outside Diameter Maximum Secondary Insulation Wall Thickness Voltage Drop across secondary winding
FEEDBACK CIRCUIT COMPONENTS
RFB PRFB 7.065217 k-Ohms 37.375 mW Feedback resistor Losses in the Feedback resistor
ESTIMATED LOSSES IN POWER SUPPLY AND EFFICIENCY, LOW LINE
PCABLE PSCU PDIODE PCAP PBIAS PCONDUCTION PCLAMP PCORE PBRIDGE EFFICIENCY ESTIMATE 69.12 182.0302 268.8 136.5226 50.6 249.8913 14.58 146.3907 32.93465 67.58908 mW mW mW mW mW mW mW mW mW % Power loss in Output Cable Transformer Secondary Copper Losses Output Diode conduction loss Power Loss in Feedback circuit Conduction Losses in LinkSwitch calculated at 100C Primary clamp losses Core Losses at peak Flux Density Primary bridge rectifier losses Estimated Power Supply Efficiency
ADDITIONAL OUTPUT
VX VDX NX PIVX Volts Volts 0 0 Volts Auxiliary Output Voltage Auxiliary Diode Forward Voltage Drop Auxiliary Number of Turns Auxiliary Rectifier Maximum Peak Inverse Voltage
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DER-75
2.4W Power Supply using LNK520P
September 12, 2005
8 Performance
8.1 Efficiency
Efficiency vs Load - 042304a
80.00%
Efficiency (%)
70.00% 85VAC 115VAC 230VAC 60.00% 265VAC
50.00%
0 100 200 300 400 500
Load (mA)
Figure 6 - Efficiency vs. Input Voltage, Room Temperature, 60 Hz.
8.2
No-Load Input Power
No Load Consumption - 042304a
0.30 0.25 0.20
Pin (W)
0.15 0.10 0.05 0.00 60 90 120 150 180 210 240 270
Vin (VAC)
No Load
Figure 7 - Zero Load Input Power vs. Input Line Voltage, Room Temperature, 60 Hz.
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DER-75 8.3 Regulation
2.4W Power Supply using LNK520P
September 12, 2005
Regulation - 042304a
7 6 5 Voltage (V) 4 3 2 1 0
0 100 200 300 400 500 600
MIN MAX 85 VAC 115 VAC 230 VAC 265 VAC
Load (mA)
Figure 8 - Line and Load Regulation, Room Temperature
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DER-75 8.4
2.4W Power Supply using LNK520P
September 12, 2005
Measurement Data
Vin 86.05 86.07 85.95 85.77 85.65 85.85 85.77 85.93 86.01 86.19 86.13 115.67 115.71 115.71 115.41 115.38 115.39 115.59 115.39 115.59 115.81 115.71 115.67 230.43 230.47 230.66 230.56 229.95 230.33 230.21 230.35 230.49 230.35 230.44 265.2 265.62 265.83 265.41 265.17 265.9 265.65 265.33 265.38 266.04 265.74 265.48 Pin 0.153 0.792 1.479 2.268 3.492 2.82 2.484 1.995 1.56 0.138 0.132 0.162 0.798 1.491 2.139 2.931 3.438 2.529 2.37 1.959 1.41 0.162 0.156 0.219 0.843 1.539 2.196 2.955 3.759 2.547 1.956 1.425 0.246 0.243 0.237 0.882 1.566 2.22 2.988 3.798 2.775 2.532 2.121 1.533 0.285 0.288 Vout 5.46 5.37 5.32 5.27 5.19 4.46 3.76 2.891 2.041 0.203 0.005 5.47 5.38 5.34 5.3 5.25 5.21 4.26 3.93 3.114 1.939 0.209 0.006 5.46 5.39 5.35 5.31 5.27 5.22 4.05 2.84 1.908 0.173 0.005 5.46 5.38 5.35 5.31 5.27 5.22 4.22 3.77 2.94 1.96 0.181 0.006 Iout 0 100 202 313 479 451 465 472 492 64 75 Pout 0 0.537 1.07464 1.64951 2.48601 2.01146 1.7484 1.364552 1.004172 0.012992 0.000375 Eff 0 0.67803 0.726599 0.727297 0.711916 0.713284 0.703865 0.683986 0.6437 0.094145 0.002841
0 0 0 100 0.538 0.674185 203 1.08402 0.727042 298 1.5794 0.738382 410 2.1525 0.734391 481 2.50601 0.728915 431 1.83606 0.726002 435 1.70955 0.721329 440 1.37016 0.699418 468 0.907452 0.643583 66 0.013794 0.085148 73 0.000438 0.002808 0 0 0 100 0.539 0.639383 203 1.08605 0.705686 297 1.57707 0.718156 410 2.1607 0.731201 527 2.75094 0.731828 447 1.81035 0.710777 463 1.31492 0.672249 458 0.873864 0.613238 54 0.009342 0.037976 65 0.000325 0.001337 0 0 0 99 0.53262 0.603878 204 1.0914 0.696935 298 1.58238 0.712784 410 2.1607 0.723126 528 2.75616 0.725687 466 1.96652 0.708656 466 1.75682 0.693847 480 1.4112 0.665347 471 0.92316 0.602192 55 0.009955 0.03493 75 0.00045 0.001563
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DER-75
2.4W Power Supply using LNK520P
September 12, 2005
9
9.1
Waveforms
Drain Voltage and Current, Normal Operation
Figure 9 - 85 VAC, Full Load (5.13 V/ 484 mA) Upper: VDRAIN, 200 V / div, Lower: IDRAIN, 0.1 A , 5 s / div
Figure 10 - 265 VAC, Full Load (5.19 V/ 490 mA) Upper: VDRAIN, 200 V / div, Lower: IDRAIN, 0.1 A , 5 s / div
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DER-75
2.4W Power Supply using LNK520P
September 12, 2005
9.2 Load Transient Response (75% to 100% Load Step) In the figures shown below, no signal averaging was used. triggered using the load current step as a trigger source.
The oscilloscope was
Figure 11 - Transient Response, 115 VAC, 75-10075% Load Step. Top: Output Voltage, 200 mV/div. Bottom: Load Current 200 mA, 2ms / div.
Figure 12 - Transient Response, 230 VAC, 75-10075% Load Step. Top: Output Voltage, 200 mV/div. Bottom: Load Current 200 mA, 2ms / div.
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DER-75
2.4W Power Supply using LNK520P
September 12, 2005
9.3
Output Ripple Measurements
9.3.1 Ripple Measurement Technique For DC output ripple measurements, a modified oscilloscope test probe must be utilized in order to reduce spurious signals due to pickup. Details of the probe modification are provided in Figure 13 and Figure 14. The 5125BA probe adapter is affixed with two capacitors tied in parallel across the probe tip. The capacitors include one (1) 0.1 F/50 V ceramic type and one (1) 1.0 F/50 V aluminum electrolytic. The aluminum electrolytic type capacitor is polarized, so proper polarity across DC outputs must be maintained (see below).
Probe Ground
Probe Tip
Figure 13 - Oscilloscope Probe Prepared for Ripple Measurement. (End Cap and Ground Lead Removed)
Figure 14 - Oscilloscope Probe with Probe Master 5125BA BNC Adapter. (Modified with wires for probe ground for ripple measurement, and two parallel decoupling capacitors added)
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DER-75
2.4W Power Supply using LNK520P
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9.3.2 Measurement Results
Figure 15 - Ripple, 85 VAC, Full Load 2 ms, 50 mV / div
Figure 16 - 5 V Ripple, 115 VAC, Full Load 2 ms, 50 mV / div
Figure 17 - Ripple, 230 VAC, Full Load 2 ms, 50 mV /div
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2.4W Power Supply using LNK520P
September 12, 2005
10 Conducted EMI
Figure 18 - Conducted EMI, Maximum Steady State Load, 115 VAC, 60 Hz, and EN55022 B Limits - Ungrounded Secondary.
Figure 19 - Conducted EMI, Maximum Steady State Load, 115 VAC, 60 Hz, and EN55022 B Limits - Grounded Secondary
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September 12, 2005
Figure 20 - Conducted EMI, Maximum Steady State Load, 230 VAC, 60 Hz, and EN55022 B Limits Ungrounded Secondary
Figure 21 - Conducted EMI, Maximum Steady State Load, 230 VAC, 60 Hz, and EN55022 B Limits Ungrounded Secondary
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2.4W Power Supply using LNK520P
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11 Revision History
Date September 12, 2005 Author RM Revision 1.0 Description & changes Initial release Reviewed VC / AM
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DER-75
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For the latest updates, visit our Web site: www.powerint.com Power Integrations may make changes to its products at any time. Power Integrations has no liability arising from your use of any information, device or circuit described herein nor does it convey any license under its patent rights or the rights of others. POWER INTEGRATIONS MAKES NO WARRANTIES 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 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. (c) Copyright 2004, Power Integrations.
Power Integrations Worldwide Sales Support Locations
WORLD HEADQUARTERS 5245 Hellyer Avenue, San Jose, CA 95138, USA Main: +1-408-414-9200 Customer Service: Phone: +1-408-414-9665 Fax: +1-408-414-9765 e-mail: usasales@powerint.com CHINA (SHANGHAI) Rm 807, Pacheer, Commercial Centre, 555 Nanjing West Road, Shanghai, 200041, China Phone: +86-21-6215-5548 Fax: +86-21-6215-2468 e-mail: chinasales@powerint.com CHINA (SHENZHEN) Rm# 1705, Bao Hua Bldg. 1016 Hua Qiang Bei Lu, Shenzhen, Guangdong, 518031, China Phone: +86-755-8367-5143 Fax: +86-755-8377-9610 e-mail: chinasales@powerint.com APPLICATIONS HOTLINE World Wide +1-408-414-9660 GERMANY Rueckertstrasse 3, D-80336, Munich, Germany Phone: +49-895-527-3910 Fax: +49-895-527-3920 e-mail: eurosales@powerint.com JAPAN Keihin-Tatemono 1st Bldg. 12-20 Shin-Yokohama, 2-Chome, Kohoku-ku, Yokohama-shi, Kanagawa 222-0033, Japan Phone: +81-45-471-1021 Fax: +81-45-471-3717 e-mail: japansales@powerint.com KOREA 8th Floor, DongSung Bldg. 17-8 Yoido-dong, Youngdeungpo-gu, Seoul, 150-874, Korea Phone: +82-2-782-2840 Fax: +82-2-782-4427 e-mail: koreasales@powerint.com SINGAPORE 51 Newton Road, #15-08/10 Goldhill Plaza, Singapore, 308900 Phone: +65-6358-2160 Fax: +65-6358-2015 e-mail: singaporesales@powerint.co m TAIWAN 17F-3, No. 510, Chung Hsiao E. Rd., Sec. 5, Taipei, Taiwan 110, R.O.C. Phone: +886-2-2727-1221 Fax: +886-2-2727-1223 e-mail: taiwansales@powerint.com
INDIA (TECHNICAL SUPPORT) Innovatech 261/A, Ground Floor 7th Main, 17th Cross, Sadashivanagar Bangalore, India, 560080 Phone: +91-80-5113-8020 Fax: +91-80-5113-8023 e-mail: indiasales@powerint.com ITALY Via Vittorio Veneto 12, Bresso, Milano, 20091, Italy Phone: +39-028-928-6001 Fax: +39-028-928-6009 e-mail: eurosales@powerint.com
UK (EUROPE & AFRICA HEADQUARTERS) 1st Floor, St. James's House East Street Farnham, Surrey GU9 7TJ United Kingdom Phone: +44-1252-730-140 Fax: +44-1252-727-689 e-mail: eurosales@powerint.com
APPLICATIONS FAX World Wide +1-408-414-9760
ER or EPR template - Rev 3.6 - Single sided
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CONFIDENTIAL
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com

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