Power DER-75 2.4 w power supply using lnk520p Datasheet

Design Example Report
Title
2.4 W Power Supply using LNK520P
Specification
Input: 85 – 265 VAC
Output: 5.0 V / 480 mA
Application
Cell Phone Charger
Author
Power Integrations Applications Department
Document
Number
DER-75
Date
September 12, 2005
Revision
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.
Power Integrations
5245 Hellyer Avenue, San Jose, CA 95138 USA.
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
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.
Page 2 of 23
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
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
Page 3 of 23
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
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
Symbol
Min
Typ
Max
Units
Comment
VIN
fLINE
85
47
265
64
0.3
VAC
Hz
W
2 Wire – no P.E.
50/60
VOUT1
VRIPPLE1
IOUT1
5.5
5.0
4.5
V
mV
mA
POUT
POUT_PEAK
η
380
480
580
2.4
W
W
%
70
± 5%
20 MHz bandwidth
± 25%
Measured at POUT (43 W), 25 oC
Environmental
Conducted EMI
Meets CISPR22B / EN55022B
Designed to meet IEC950, UL1950
Class II
Safety
Surge
2
kV
Surge
2
kV
TAMB
Ambient Temperature
0
50
o
C
1.2/50 µs surge, IEC 1000-4-5,
Series Impedance:
Differential Mode: 2 Ω
Common Mode: 12 Ω
100 kHz ring wave, 500 A short
circuit current, differential and
common mode
Free convection, sea level
Regualtion Specification
7
6
Voltage (V)
5
4
MIN
MAX
3
2
1
0
0
100
200
300
400
500
600
Load (mA)
Page 4 of 23
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-75
2.4W Power Supply using LNK520P
September 12, 2005
3 Schematic
Figure 2 – Schematic
Page 5 of 23
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
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.
Page 6 of 23
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-75
2.4W Power Supply using LNK520P
September 12, 2005
5 PCB Layout
Figure 3 – Printed Circuit Layout
Page 7 of 23
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-75
2.4W Power Supply using LNK520P
September 12, 2005
6 Bill Of Materials
Item Quantity
1
2
3
4
5
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
20-00205-00
Mfg Part
Number
ECUV1H471KBN
20-00434-00
SHD400WV
4.7uF
Part Number
20-00014-00
20-00237-00
Cap,Cer, 1.0 uF, 50V, 10%
20-00308-00
6
7
8
10
11
1 C12
D1 D3 D5
5 D7 D10
1 D2
1 D4
2 J1 J2
2 J3 J4
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
15-00089-00
15-00153-00
TMP-59
35-00008-00
35-00007-00
12
12
2 L1
2 L3
CHOKE,1mH,SBCP_47HY102B,TOKIN 30-00018-00
CHOKE,FERRITE BEAD
13
1 R3
Res,150K 1/16W 5% 0603 SMD
05-01740-00
14
15
1 R4
1 R6
Res,300 1/10W 5% 0805 SMD
Res,7.50K 1/16W 1% 0603 SMD
05-01506-00
05-01162-00
16
1 R7
Res,15 1/16W 5% 0603 SMD
05-01644-00
17
1 R9
Res,680 1/16W 5% 0603 SMD
05-01684-00
18
1 R10
Res,120 1/16W 5% 0603 SMD
05-01666-00
19
20
1 RF1
1 T1
05-02802-00
25-00061-00
21
1 U1
22
23
1 U2
1 VR1
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
Page 8 of 23
CONFIDENTIAL
KZE16VB331MH
11LL
ECJ2YB1E224K
ECUS1H105KBB
1N4005-T
11DQ06
1N4007GDICT
SBCP_47HY102
B
ERJ3GEYJ154V
ERJ6GEYJ301V
ERJ-3EKF7501V
ERJ3GEYJ150V
ERJ3GEYJ681V
ERJ3GEYJ121V
RSF200JB0R8.2
TMP-111
LNK520P
45-00008-00
15-00188-00
PC817D
ZMM5230B-7
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
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
7
3
W4: 12T
1 x 26 TIW
W2: 114T
1 x 35 AWG
4
8
3
W3: 13T
2 x 31 AWG
FL1
Figure 4 – Transformer Electrical Diagram
6.2
Electrical Specifications
Electrical Strength
Primary Inductance
Resonant Frequency
Primary Leakage Inductance
6.3
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 µH, 0/+20%
300 kHz (Min.)
100 µH (Max.)
Materials
Item
[1]
[2]
[3a]
[3b]
[3c]
[3d]
[4a]
[6]
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
Page 9 of 23
CONFIDENTIAL
2
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-75
6.4
2.4W Power Supply using LNK520P
September 12, 2005
Transformer Build Diagram
8
7
3
W4
Secondary
Tape
W3 Shield
FL1
Floating
3
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
Page 10 of 23
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]).
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
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
INFO
LinkSwitch (LNK52X) 030404 Rev.1.7; Copyright Power
Integrations 2004
OUTPUT UNIT
ENTER APPLICATION VARIABLES
VACMIN
VACMAX
fL
VO
IO
DI-75 - 042304A
85
265
50
5
0.48
VBIAS
tC
CIN
20
3
9.4
Volts
Volts
Hertz
Volts
Amps
Minimum AC Input Voltage
Maximum AC Input Voltage
AC Mains Frequency
Output Voltage
Continuous Nominal Output current
msec
uFarads
Bias voltage (recommended default 20V, minimum 16V)
Bridge Rectifier Conduction Time Estimate
Input Filter Capacitor
ESTIMATED LOSSES
PCORE
146.3907 mW
RCLAMP
ESR
200 Kohm
0.15 Ohms
RSEC
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
LNK520
I^2 f
VOR
Universal 115 Doubled/230
Power
5.5 3.5
I^2 f (typical) co-efficient for LinkSwitch
2710 A^2 Hz
54
54 Volts
VLEAK
2 Volts
VD
0.56
VR
ID
1.1
0.56 Volts
60 Volts
Amps
Reflected Output Voltage (40<VOR<80 recommended)
Error in Feedback voltage as a result of leakage
inductance in primary circuit.
Output Winding Diode Forward Voltage Drop (0.5~0.7V
for schottky and 0.7~1.0V for PN diode)
Rated Peak Rep Reverse Voltage of secondary diode
Rated Average Forward current for secondary diode
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
0.276666
0.035137 Amps
0.077135 Amps
Maximum Operating Duty Cycle
Average Primary Current
Primary RMS Current
CURRENT WAVEFORM SHAPE PARAMETERS
DMAX
IAVG
IRMS
Page 11 of 23
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
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
T(n)
M
NS
0.9
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
cm^2
cm
nH/T^2
mm^3
mm
kW/m^3
0.9
0 mm
12
TRANSFORMER PRIMARY DESIGN PARAMETERS
dLP
LP
L
LBIAS
NP
NB
ALG
BP
LG
3
1
OD
DIA
1.003
2390.284
3
1
113.6045
36.28176
185.2075
3445.212
0.097008
uHenries
nH/T^2
Gauss
mm
0.195415 mm
0.154132 mm
AWG
35 AWG
Constant to account for reduction of inductance at
higher flux densities. (0.999<dLP<1.05)
Primary Inductance
Number of Primary Layers
Number of Bias winding Layers
Primary Winding Number of Turns
Gapped Core Effective Inductance
Peak Flux Density (BP<3700)
Core Gap Length for primary inductance
Maximum Primary Wire Diameter including insulation to
give specified number of layers.
Bare conductor diameter
Primary Wire Gauge (Rounded to next smaller standard
AWG value)
414.8576 Cmils/Amp Primary Winding Current Capacity (200 < CMA < 500)
32 AWG
CMA
AWG_BIAS
TRANSFORMER SECONDARY DESIGN PARAMETERS
ISP
ISRMS
IRIPPLE
2.404628 Amps
0.954018 Amps
0.82447 Amps
AWGS
DIAS
30 AWG
0.256342 mm
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
ODS
INSS
VSEC
0.616667 mm
0.180162 mm
0.096 Volts
Secondary Maximum Insulated Wire Outside Diameter
Maximum Secondary Insulation Wall Thickness
Voltage Drop across secondary winding
7.065217 k-Ohms
37.375 mW
Feedback resistor
Losses in the Feedback resistor
FEEDBACK CIRCUIT COMPONENTS
RFB
PRFB
ESTIMATED LOSSES IN POWER SUPPLY AND EFFICIENCY, LOW LINE
PCABLE
PSCU
PDIODE
PCAP
PBIAS
69.12
182.0302
268.8
136.5226
50.6
mW
mW
mW
mW
mW
Power loss in Output Cable
Transformer Secondary Copper Losses
Output Diode conduction loss
PCONDUCTION
PCLAMP
PCORE
PBRIDGE
EFFICIENCY ESTIMATE
249.8913
14.58
146.3907
32.93465
67.58908
mW
mW
mW
mW
%
Conduction Losses in LinkSwitch calculated at 100C
Primary clamp losses
Core Losses at peak Flux Density
Primary bridge rectifier losses
Estimated Power Supply Efficiency
Volts
Volts
Auxiliary Output Voltage
Auxiliary Diode Forward Voltage Drop
Auxiliary Number of Turns
Auxiliary Rectifier Maximum Peak Inverse Voltage
Power Loss in Feedback circuit
ADDITIONAL OUTPUT
VX
VDX
NX
PIVX
Page 12 of 23
0
0 Volts
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-75
2.4W Power Supply using LNK520P
September 12, 2005
8 Performance
8.1
Efficiency
Efficiency vs Load - 042304a
Efficiency (%)
80.00%
70.00%
85VAC
115VAC
230VAC
265VAC
60.00%
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
Pin (W)
0.20
0.15
No Load
0.10
0.05
0.00
60
90
120
150
180
210
240
270
Vin (VAC)
Figure 7 – Zero Load Input Power vs. Input Line Voltage, Room Temperature, 60 Hz.
Page 13 of 23
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-75
8.3
2.4W Power Supply using LNK520P
September 12, 2005
Regulation
Regulation - 042304a
7
6
Voltage (V)
5
MIN
MAX
4
85 VAC
115 VAC
3
230 VAC
265 VAC
2
1
0
0
100
200
300
400
500
600
Load (mA)
Figure 8 – Line and Load Regulation, Room Temperature
Page 14 of 23
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-75
8.4
2.4W Power Supply using LNK520P
September 12, 2005
Measurement Data
Vin
Page 15 of 23
Pin
Vout
Iout
Pout
0.153
0.792
1.479
2.268
3.492
2.82
2.484
1.995
1.56
0.138
0.132
5.46
5.37
5.32
5.27
5.19
4.46
3.76
2.891
2.041
0.203
0.005
0
100
202
313
479
451
465
472
492
64
75
115.67
115.71
115.71
115.41
115.38
115.39
115.59
115.39
115.59
115.81
115.71
115.67
0.162
0.798
1.491
2.139
2.931
3.438
2.529
2.37
1.959
1.41
0.162
0.156
5.47
5.38
5.34
5.3
5.25
5.21
4.26
3.93
3.114
1.939
0.209
0.006
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
230.43
230.47
230.66
230.56
229.95
230.33
230.21
230.35
230.49
230.35
230.44
0.219
0.843
1.539
2.196
2.955
3.759
2.547
1.956
1.425
0.246
0.243
5.46
5.39
5.35
5.31
5.27
5.22
4.05
2.84
1.908
0.173
0.005
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
265.2
265.62
265.83
265.41
265.17
265.9
265.65
265.33
265.38
266.04
265.74
265.48
0.237
0.882
1.566
2.22
2.988
3.798
2.775
2.532
2.121
1.533
0.285
0.288
5.46
5.38
5.35
5.31
5.27
5.22
4.22
3.77
2.94
1.96
0.181
0.006
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
CONFIDENTIAL
0
0.537
1.07464
1.64951
2.48601
2.01146
1.7484
1.364552
1.004172
0.012992
0.000375
Eff
86.05
86.07
85.95
85.77
85.65
85.85
85.77
85.93
86.01
86.19
86.13
0
0.67803
0.726599
0.727297
0.711916
0.713284
0.703865
0.683986
0.6437
0.094145
0.002841
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-75
2.4W Power Supply using LNK520P
9
Waveforms
9.1
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 µs / div
Page 16 of 23
CONFIDENTIAL
September 12, 2005
Figure 10 – 265 VAC, Full Load (5.19 V/ 490 mA)
Upper: VDRAIN, 200 V / div,
Lower: IDRAIN, 0.1 A , 5 µs / div
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-75
2.4W Power Supply using LNK520P
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.
Figure 11 – Transient Response, 115 VAC, 75-10075% Load Step.
Top: Output Voltage, 200 mV/div.
Bottom: Load Current
200 mA, 2ms / div.
Page 17 of 23
CONFIDENTIAL
September 12, 2005
The oscilloscope was
Figure 12 – Transient Response, 230 VAC, 75-10075% Load Step.
Top: Output Voltage, 200 mV/div.
Bottom: Load Current
200 mA, 2ms / div.
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-75
9.3
2.4W Power Supply using LNK520P
September 12, 2005
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 µF/50 V ceramic type and one (1) 1.0 µF/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)
Page 18 of 23
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-75
2.4W Power Supply using LNK520P
September 12, 2005
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
Page 19 of 23
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-75
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
Page 20 of 23
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-75
2.4W Power Supply using LNK520P
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
Page 21 of 23
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-75
2.4W Power Supply using LNK520P
September 12, 2005
11 Revision History
Date
September 12, 2005
Page 22 of 23
Author
RM
Revision
1.0
CONFIDENTIAL
Description & changes
Initial release
Reviewed
VC / AM
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-75
2.4W Power Supply using LNK520P
September 12, 2005
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.
© 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:
[email protected]
GERMANY
Rueckertstrasse 3,
D-80336, Munich, Germany
Phone: +49-895-527-3910
Fax:
+49-895-527-3920
e-mail: [email protected]
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:
[email protected]
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:
[email protected]
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:
[email protected]
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: [email protected]
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:
[email protected]
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: [email protected]
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:
[email protected]
ITALY
Via Vittorio Veneto 12, Bresso,
Milano,
20091, Italy
Phone: +39-028-928-6001
Fax: +39-028-928-6009
e-mail: [email protected]
SINGAPORE
51 Newton Road,
#15-08/10 Goldhill Plaza,
Singapore, 308900
Phone: +65-6358-2160
Fax:
+65-6358-2015
e-mail:
[email protected]
m
APPLICATIONS HOTLINE
World Wide +1-408-414-9660
APPLICATIONS FAX
World Wide +1-408-414-9760
ER or EPR template – Rev 3.6 – Single sided
Page 23 of 23
CONFIDENTIAL
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
Similar pages