Design Example Report Title 9 W High Efficiency

Design Example Report
Title
9 W High Efficiency (>90%) Power Factor
Corrected Non-Isolated Buck LED Driver
Using LinkSwitchTM-TN LNK306DG
Specification
95 VAC – 265 VAC Input;
60 VTYPICAL, 150 mA Output
Application
A19 LED Driver
Author
Applications Engineering Department
Document
Number
DER-386
Date
December 5, 2013
Revision
1.0
Summary and Features







Accurate constant current (CC) output
Low cost, low component count and small PCB footprint solution
Highly energy efficient, >90% at 120 VAC and 240 V input
Fast start-up time (<100 ms) – no perceptible delay
Integrated protection and reliability features
 One shot no-load protection
 Short-circuit protected
 Auto-recovering thermal shutdown with large hysteresis protects both components and PCB
 No damage during brown-out conditions
PF >0.7 at 120 VAC and PF >0.5 at 240 VAC
Meets IEC ring wave, differential line surge and EN55015 conducted EMI
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
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DER-386 9 W Buck LED Power Supply Using LNK306DG
05-Dec-13
Table of Contents
1 2 3 4 Introduction ................................................................................................................. 3 Power Supply Specifications ...................................................................................... 4 Schematic ................................................................................................................... 5 Circuit Description ...................................................................................................... 6 4.1 Input EMI Filtering ............................................................................................... 6 4.2 Buck using LinkSwitch-TN ................................................................................... 6 4.3 Output Feedback ................................................................................................. 6 4.4 Disconnected Load Protection............................................................................. 7 5 PCB Layout ................................................................................................................ 8 6 Populated PCB ........................................................................................................... 9 7 Bill of Materials ......................................................................................................... 10 8 Inductor Spreadsheet ............................................................................................... 11 9 Performance Data .................................................................................................... 13 9.1 Active Mode Efficiency ...................................................................................... 14 9.2 Line Regulation ................................................................................................. 15 9.3 Power Factor ..................................................................................................... 16 9.4 Thermal Scans .................................................................................................. 17 10 Waveforms ............................................................................................................ 18 10.1 Drain Voltage and Current, Normal Operation................................................... 18 10.2 Drain Voltage and Current Start-up Profile ........................................................ 20 10.3 Output Voltage Start-up Profile.......................................................................... 21 10.4 Input and Output Voltage and Current Profiles .................................................. 22 10.5 Drain Voltage and Current Profile with Normal Operation then Output Short .... 23 10.6 Drain Voltage and Current Profile, Start-up with Output Shorted ...................... 24 10.7 No-Load Operation ............................................................................................ 24 10.8 AC Cycle ........................................................................................................... 25 10.9 Brown-out .......................................................................................................... 27 10.10 Line Surge Waveform .................................................................................... 28 11 Line Surge............................................................................................................. 29 12 Conducted EMI ..................................................................................................... 30 12.1 Equipment: ........................................................................................................ 30 12.2 EMI Test Set-up ................................................................................................ 30 12.3 EMI Test Result ................................................................................................. 32 13 Revision History .................................................................................................... 36 Important Note:
Although this board is designed to satisfy safety requirements for non-isolated LED
drivers, 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.
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Page 2 of 37
05-Dec-13
DER-386 9 W Buck LED Power Supply Using LNK306DG
1 Introduction
This document is an engineering report describing a non-isolated LED driver (power
supply) utilizing a LNK306DG from the LinkSwitch-TN family of devices.
The low cost single constant current output LED driver has an output power of 9 W at 150
mA and supports a 54 V to 66 V LED string. The board was optimized to operate over the
entire AC input voltage range (95 VAC to 265 VAC, 47 Hz to 63 Hz).
Figure 1 – Populated Circuit Board Assembly.
The form factor of the board was chosen to meet the requirements for standard A19 LED
replacement lamps. The output is non-isolated and requires the mechanical design of the
enclosure to isolate the output of the supply and the LED load from the user.
The document contains the power supply specification, schematic, bill of materials,
transformer documentation, printed circuit layout, design spreadsheet and performance
data.
Page 3 of 37
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DER-386 9 W Buck LED Power Supply Using LNK306DG
05-Dec-13
2 Power Supply Specifications
The table below represents the minimum acceptable performance for the design. Actual
performance is listed in the results section.
Description
Input
Voltage
Frequency
Symbol
Min
Typ
Max
Units
Comment
VIN
fLINE
95
47
120/240
50/60
265
63
VAC
Hz
2 Wire – no P.E.
At 120 VAC
Power Factor
0.7
At 240 VAC
0.5
Output
Output Voltage
Output Current
Total Output Power
Continuous Output Power
Efficiency
VOUT
IOUT
60
150
66
9
POUT

Nominal
54
90
V
mA
W
o
%
Measured at POUT 25 C at 120 VAC
and 240 VAC
Environmental
Conducted EMI
Meets CISPR22B / EN55015
Line Surge
Differential Mode (L1-L2)
500
V
1.2/50 s surge, IEC 1000-4-5,
Series Impedance:
Differential Mode: 2 
Ring Wave (100 kHz)
Differential Mode (L1-L2)
2.5
kV
2  short-circuit
Series Impedance
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Page 4 of 37
05-Dec-13
DER-386 9 W Buck LED Power Supply Using LNK306DG
3 Schematic
Figure 2 – Schematic for A19 Replacement Lamp.
Page 5 of 37
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DER-386 9 W Buck LED Power Supply Using LNK306DG
05-Dec-13
4 Circuit Description
The LinkSwitch-TN (U1) is a highly integrated primary side controller intended for use in
LED driver or DC supply applications. The design is optimized to provide high power
factor in a single-stage conversion topology while regulating the output current across a
range of input (95 VAC to 265 VAC) and output voltage variations typically encountered
in LED driver applications. All of the control circuitry responsible for these functions plus a
high-voltage power MOSFET are incorporated into the IC.
4.1 Input EMI Filtering
Fuse RF1 provides protection against component failure. A fast 5 A rating was needed to
prevent false opening during line surges. The maximum input voltage is clamped by RV1
during differential line surges.
The AC input is full wave rectified by BR1 (vs. half wave) to achieve good power factor.
Capacitor C1, C2 and differential choke L1 perform EMI filtering while the small input
capacitance ensures high power factor. This input  filter network plus the frequency
jittering feature of LinkSwitch-TN allows compliance with Class B emission limits. Resistor
R1 was used to damp the resonance of the EMI filter, preventing peaks in the EMI
spectrum when measured in a system (driver plus enclosure). Inductor L1 was positioned
after the bridge to avoid an imbalance in the EMI scan between line and neutral. The
inductance of L1 can be increased if wider EMI margin is needed. Positioning the EMI
filter after the bridge allows the use small high-voltage ceramic capacitors in the input
filter.
4.2 Buck Using LinkSwitch-TN
LinkSwitch-TN is optimized in such a way as to achieve a simple and cost effective, high
efficient LED driver with a good line input CC and temperature regulation from 0 to 100
C (device case temperatures). LinkSwitch-TN has built-in over-temperature protection
(OTP) to protect the circuit in high ambient conditions.
The buck converter stage consists of the integrated power MOSFET switch within the
LNK306DG (U1), a fast freewheeling diode (D1), sense resistor (R2), power inductor L2
and output capacitor (C5). The converter operates mostly in discontinuous mode (DCM)
to limit reverse current. A fast freewheeling diode was selected to minimize switching
losses.
4.3 Output Feedback
For this design the output current is compensated from the output current sampling
during the freewheeling of the converter. It is sensed from the R2 and filtered by C4 then
fed to the FB pin for proper regulation. Proper balancing of power inductor and sense
resistor once the minimum power inductance is calculated ensures good CC regulation
over line voltage. Refer to Application Note AN-60 and PIXI Designer Spreadsheet for
optimization procedure.
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Page 6 of 37
05-Dec-13
DER-386 9 W Buck LED Power Supply Using LNK306DG
The bypass capacitor (C4) across the feedback helps to reduce the power loss during
output current sensing and provides a sample-and-hold function to provide current
information to the FB pin. No limiting resistor was fitted across the FB pin and C4
because the peak voltage will not exceed the absolute rating of the device.
4.4 Disconnected Load Protection
Simple one shot no-load protection is achieved with a Zener diode (VR1) across the
output terminals. In case of no-load or open-load condition, the Zener diode would go
short-circuit permanently in order to protect the output capacitor. During this condition the
IC U1 will be protected by the internal primary current limit. Note that the Zener diode
would need to be replaced once fault is removed.
Page 7 of 37
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DER-386 9 W Buck LED Power Supply Using LNK306DG
05-Dec-13
5 PCB Layout
Figure 3 – Printed Circuit Layout, Top.
Figure 4 – Printed Circuit Layout, Bottom.
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Page 8 of 37
05-Dec-13
DER-386 9 W Buck LED Power Supply Using LNK306DG
6 Populated PCB
Figure 5 –Populated Circuit Board, Top.
Figure 6 – Populated Circuit Board, Bottom.
Page 9 of 37
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DER-386 9 W Buck LED Power Supply Using LNK306DG
05-Dec-13
7 Bill of Materials
The table below is the reference design BOM.
Item
Qty
Ref Des
1
1
BR1
Description
2
1
C1
100 nF, 450 V, Film
MEXXD31004JJ1
Duratech
3
1
C2
330 nF, 450 V, METALPOLYPRO
ECW-F2W334JAQ
Panasonic
4
1
C3
100 nF, 25 V, Ceramic, X7R, 0603
VJ0603Y104KNXAO
Vishay
5
1
C4
22 F, 16 V, Ceramic, X7R, 0805
C2012X5R1C226K
TDK
6
1
C5
68 F, 100 V, Electrolytic, Gen. Purpose, (10 x 16)
UHE2A680MPD
Nichicon
7
1
D1
600 V, 1 A, Ultrafast Recovery, DO-41
8
1
L1
4.7 mH, 0.150 A, 20%
600 V, 0.5 A, Bridge Rectifier, SMD, MBS-1, 4-SOIC
Mfg Part Number
Manufacturer
MB6S-TP
Micro Commercial
STTH1R06RL
ST Micro
RL-5480-3-4700
Renco Elect
Renco Elect
9
1
L2
1.5 mH, 0.8 A, 20%
RL-5480-4-1500
10
1
R1
4.7 k, 5%, 1/8 W, Thick Film, 0805
ERJ-6GEYJ472V
Panasonic
11
1
R2
13.3 , 1%, 1/8 W, Thick Film, 0805
ERJ-6ENF13R3V
Panasonic
12
1
RF1
5 A, 250 V, Fast, Microfuse, Axial
13
1
RV1
250 V, 21 J, 7 mm, RADIAL LA
0263005.MXL
Littlefuse
V250LA4P
Littlefuse
14
1
U1
LinkSwitch-TN, SO-8
LNK306DG
Power Integrations
15
1
VR1
91 V, 5%, 1 W, DO-41
1N4763A-TR
Vishay
Power Integrations, Inc.
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Page 10 of 37
05-Dec-13
DER-386 9 W Buck LED Power Supply Using LNK306DG
8 Inductor Spreadsheet
ACDC_LNKTN Copyright
Power Integrations 2013
INPUT VARIABLES
VACMIN
VACNOM
VACMAX
FL
VO
IO
Pout
OUTPUT
UNIT
LNKTN Design Spreadsheet
95
230
265
50
60
150.000
95.00
230.00
265.00
50.00
60.00
150
9.00
Volts
Volts
Volts
Hertz
Volts
mA
W
EFFICIENCY
0.90
0.90
CIN
DC INPUT VARIABLES
VMIN
VMAX
LYTSwitchZero
0.43
0.43
uF
Minimum AC Input Voltage
Nominal AC Input Voltage
Maximum AC Input Voltage
Select Line Frequency
Output Voltage
Output Current
Output Power
Overall Efficiency Estimate (Adjust to
match Calculated, or enter Measured
Efficiency)
Input Filter Capacitor
60.0
374.8
Volts
Volts
LYTSwitchZero
INPUT
LNK306
INFO
LNK306
ILIMIT
ILIMIT_MIN
ILIMIT_MAX
FSMIN
0.482
0.450
0.647
62000
Amps
Amps
Amps
Hertz
IRMS
121.88
mA
VDS
6.0
Volts
VD
0.70
Volts
VRR
400
Volts
1
Amps
Minimum DC Bus Voltage
Maximum DC bus Voltage
Selected LYTSwitchZero. Ordering
info - Suffix P/G indicates DIP 8
package; suffix D indicates SO8
package; second suffix N indicates
lead free RoHS compliance
Typical Current Limit
Minimum Current Limit
Maximum Current Limit
Minimum Switching Frequency
Expected RMS current through
Switch
Maximum On-State Drain To Source
Voltage drop
DIODE
IF
Diode Recommendation
OUTPUT INDUCTOR
BYV26C
Core type
Off-the-Shelf
Core size
EP13
Off-theShelf
EP13
Custom Core
AE
LE
AL
BW
NL
BP
LG
N/A
N/A
N/A
N/A
N/A
N/A
N/A
mm^2
mm
nH/T^2
mm
OD
N/A
mm
INS
N/A
mm
DIA
N/A
mm
Page 11 of 37
Gauss
mm
Freewheeling Diode Forward Voltage
Drop
Recommended PIV rating of
Freewheeling Diode
Recommended Diode Continuous
Current Rating
Suggested Freewheeling Diode
Select core type between Ferrite and
Off-the-Shelf
Select core size
Enter custom core description (if
used)
Core Effective Cross Sectional Area
Core Effective Path Length
Ungapped Core Effective Inductance
Bobbin Physical Winding Width
Number of turns on inductor
Peak flux density
Gap length
Maximum Primary Wire Diameter
including insulation
Estimated Total Insulation Thickness
(= 2 * film thickness)
Bare conductor diameter
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DER-386 9 W Buck LED Power Supply Using LNK306DG
AWG
N/A
AWG
CM
N/A
Cmils
CMA
N/A
Cmils/Amp
L
N/A
LP_MIN
1360.00
1360
uH
IO_Average
104.2
mA
ILRMS
192.53
mA
05-Dec-13
Primary Wire Gauge (Rounded to
next smaller standard AWG value)
Bare conductor effective area in
circular mils
CAN DECREASE CMA < 500
(decrease L(primary layers),increase
NS,use smaller Core)
Number of layers
Minimum value of Output Inductor,
Recommended Standard Value
Average output current (Nominal
input voltage)
Estimated RMS inductor current (at
VMAX)
FEEDBACK COMPONENTS
RFB
13.30
Increase RFB
CFB
OUTPUT REGULATION
IO_VACMIN
IO_VACNOM
IO_VACMAX
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13.30
Ohms
22
uF
Feedback Resistor. Use closest
standard 1% value. Use Goal seek to
adjust (or manually adadjust) value of
RFB such that IO_VACNOM equals
the specified value of IO
Feedback Capacitor
148.1
151.7
150.1
mA
mA
mA
Output Current at VACMIN
Output Current at VACNOM
Output Current at VACMAX
Page 12 of 37
05-Dec-13
DER-386 9 W Buck LED Power Supply Using LNK306DG
9 Performance Data
All measurements performed at 25 ºC room temperature, 60 Hz input frequency unless
otherwise specified.
Input
VAC Freq
VRMS) (Hz)
95
100
115
120
132
190
200
220
240
265
60
60
60
60
60
50
50
50
50
50
95
100
115
120
132
190
200
220
240
265
60
60
60
60
60
50
50
50
50
50
95
100
115
120
132
190
200
220
240
265
60
60
60
60
60
50
50
50
50
50
Input Measurement
Load Measurement
IIN
PIN
VOUT
IOUT
POUT
Reg
PF
(ARMS)
(W)
(VDC) (mADC)
(W)
(%)
VOUT Minimum
94.93 131.61 9.469 0.758 53.90 156.30
8.53
4.20
99.99 125.41 9.532 0.760 53.90 157.80
8.60
5.20
114.99 107.88 9.419 0.759 54.00 157.20
8.55
4.80
119.97 104.55 9.398 0.749 53.90 157.10
8.53
4.73
131.97 100.38 9.396 0.709 54.00 157.30
8.53
4.87
190.00 86.31
9.242 0.564 53.90 155.20
8.39
3.47
199.94 83.86
9.196 0.549 53.80 154.60
8.34
3.07
220.01 79.51
9.131 0.522 53.80 153.50
8.27
2.33
239.98 75.41
9.053 0.500 53.80 152.30
8.19
1.53
265.03 74.11
9.037 0.460 53.70 152.10
8.18
1.40
VOUT Nominal
94.93 138.96 10.196 0.773 59.90 152.00
9.23
1.33
99.99 134.25 10.350 0.771 60.00 154.60
9.39
3.07
114.99 116.46 10.387 0.776 60.10 156.40
9.48
4.27
119.96 113.23 10.441 0.769 60.10 157.40
9.53
4.93
131.97 105.58 10.503 0.754 60.30 158.60
9.61
5.73
190.00 88.23 10.253 0.612 60.10 155.70
9.38
3.80
199.94 87.21 10.232 0.587 60.10 155.40
9.36
3.60
220.00 83.37 10.155 0.554 60.00 154.30
9.28
2.87
239.98 77.03
9.985 0.540 59.90 151.90
9.11
1.27
265.03 75.49 10.040 0.502 60.00 152.60
9.17
1.73
VOUT Maximum
94.93 143.98 10.596 0.775 66.00 143.60
9.61
-4.27
99.99 139.39 10.859 0.779 66.20 147.20
9.87
-1.87
114.99 127.25 11.272 0.770 66.40 153.40 10.28 2.27
119.96 123.40 11.320 0.765 66.50 154.30 10.34 2.87
131.97 110.92 11.365 0.776 66.60 155.60 10.42 3.73
189.99 90.46 11.258 0.655 66.60 155.00 10.34 3.33
199.94 88.87 11.218 0.631 66.50 154.40 10.29 2.93
220.00 86.89 11.192 0.586 66.50 154.00 10.26 2.67
239.98 82.43 11.092 0.561 66.50 152.80 10.17 1.87
265.03 77.97 10.992 0.532 66.30 151.50 10.06 1.00
VIN
(VRMS)
Efficiency
(%)
90.08
90.22
90.77
90.76
90.78
90.78
90.69
90.57
90.47
90.52
90.53
90.72
91.27
91.27
91.50
91.49
91.48
91.38
91.24
91.33
90.69
90.89
91.20
91.34
91.68
91.85
91.73
91.67
91.69
91.52
Table 1 – Parametric Data (From One Sample).
Page 13 of 37
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DER-386 9 W Buck LED Power Supply Using LNK306DG
9.1
05-Dec-13
Active Mode Efficiency
92.2
66 V
60 V
54 V
92.0
91.8
91.6
Efficiency (%)
91.4
91.2
91.0
90.8
90.6
90.4
90.2
90.0
89.8
70
90
110
130
150
170
190
210
230
250
270
290
Input Voltage, VAC (RMS)
Figure 7 – Efficiency with Respect to AC Input Voltage.
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05-Dec-13
9.2
DER-386 9 W Buck LED Power Supply Using LNK306DG
Line Regulation
8.0
66 V
60 V
54 V
6.0
Regulation (%)
4.0
2.0
0.0
-2.0
-4.0
-6.0
-8.0
70
90
110
130
150
170
190
210
230
250
270
Input Voltage, VAC (RMS)
Figure 8 – Line Regulation, Room Temperature.
Page 15 of 37
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290
DER-386 9 W Buck LED Power Supply Using LNK306DG
9.3
05-Dec-13
Power Factor
0.85
66 V
60 V
54 V
0.80
0.75
Power Factor
0.70
0.65
0.60
0.55
0.50
0.45
0.40
70
90
110
130
150
170
190
210
230
250
270
290
Input Voltage, VAC (RMS)
Figure 9 – High Power Factor Across the Operating Range.
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DER-386 9 W Buck LED Power Supply Using LNK306DG
9.4 Thermal Scans
The scan is conducted at ambient temperature of 25 ºC, 95 VAC / 60 Hz and 265 VAC /
50 Hz input.
Figure 10 – Top Thermal Scan at 95 VAC / 60 Hz.
SP1: L2 – Power Inductor.
SP2: C5 – Output Capacitor.
SP3: D1 – Freewheeling Diode.
SP4: L1 – Differential Choke Filter.
SP5: Ambient.
Figure 11 – Top Thermal Scan at 265 VAC / 50 Hz.
SP1: L2 – Power Inductor.
SP2: C5 – Output Capacitor.
SP3: D1 – Freewheeling Diode.
SP4: L1 – Differential Choke Filter.
SP5: Ambient.
Figure 12 – Bottom Thermal Scan at 95 VAC / 60 Hz.
SP1: U1 – LNK306DG.
SP2: R2 – Sense Resistor.
SP3: BR1 – Bridge Rectifier Diode.
Figure 13 – Bottom Thermal Scan at 265 VAC / 50 Hz.
SP1: U1 – LNK306DG.
SP2: R2 – Sense Resistor.
SP3: BR1 – Bridge Rectifier Diode.
SP4: Ambient.
Page 17 of 37
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DER-386 9 W Buck LED Power Supply Using LNK306DG
05-Dec-13
10 Waveforms
10.1 Drain Voltage and Current, Normal Operation
Figure 14 – 95 VAC / 60 Hz, 60 V LED String.
Ch1: VBULK, 100 V / div.
Ch3: IDRAIN, 0.5 A / div.
F1: VD-S, 100 V / div.
Time Scale: 1 ms / div.
Figure 15 – 95 VAC / 60 Hz, 60 V LED String.
Ch1: VBULK, 100 V / div.
Ch3: IDRAIN, 0.5 A / div.
F1: VD-S, 100 V / div.
Time Scale: 50 s / div.
Figure 16 – 115 VAC / 60 Hz, 60 V LED String.
Ch1: VBULK, 100 V / div.
Ch3: IDRAIN, 0.5 A / div.
F1: VD-S, 100 V / div.
Time Scale: 1 ms / div.
Figure 17 – 115 VAC / 60 Hz, 60 V LED String.
Ch1: VBULK, 100 V / div.
Ch3: IDRAIN, 0.5 A / div.
F1: VD-S, 100 V / div.
Time Scale: 50 s / div.
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05-Dec-13
DER-386 9 W Buck LED Power Supply Using LNK306DG
Figure 18 – 230 VAC / 50 Hz, 60 V LED String.
Ch1: VBULK, 200 V / div.
Ch3: IDRAIN, 0.5 A / div.
F1: VD-S, 200 V / div.
Time Scale: 1 ms / div.
Figure 19 – 230 VAC / 50 Hz, 60 V LED String.
Ch1: VBULK, 200 V / div.
Ch3: IDRAIN, 0.2 A / div.
F1: VD-S, 200 V / div.
Time Scale: 20 s / div.
Figure 20 – 265 VAC / 60 Hz, 60 V LED String.
Ch1: VBULK, 200 V / div.
Ch3: IDRAIN, 0.5 A / div.
F1: VD-S, 200 V / div.
Time Scale: 1 ms / div.
Figure 21 – 265 VAC / 60 Hz, 60 V LED String.
Ch1: VBULK, 200 V / div.
Ch3: IDRAIN, 0.2 A / div.
F1: VD-S, 200 V / div.
Time Scale: 20 s / div.
Page 19 of 37
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DER-386 9 W Buck LED Power Supply Using LNK306DG
05-Dec-13
10.2 Drain Voltage and Current Start-up Profile
Start-up time <50 ms.
Figure 22 – 95 VAC / 50 Hz, 60 V LED String.
Ch1: VBULK, 200 V / div.
Ch2: VD-G, 200 V / div.
Ch3: IDRAIN, 200 mA / div.
Time Scale: 5 ms / div.
Z3: IDRAIN, 200 mA / div.
Zoom Time Scale: 10 s / div.
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Figure 23 – 265 VAC / 50 Hz, 60 V LED String.
Ch1: VBULK, 200 V / div.
Ch2: VD-G, 200 V / div.
Ch3: IDRAIN, 200 mA / div.
Time Scale: 5 ms / div.
Z3: IDRAIN, 200 mA / div.
Zoom Time Scale: 10 s / div.
Page 20 of 37
05-Dec-13
DER-386 9 W Buck LED Power Supply Using LNK306DG
10.3 Output Voltage Start-up Profile
Start-up time <50 ms.
Figure 24 – 95 VAC / 60 Hz, 60 V LED
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch3: IIN, 200 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 20 ms / div.
Figure 25 – 115 VAC / 60 Hz, 60 V LED
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch3: IIN, 200 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 20 ms / div.
Figure 26 – 230 VAC / 50 Hz, 60 V LED
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch3: IIN, 200 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 20 ms / div.
Figure 27 – 265 VAC / 50 Hz, 60 V LED String.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch3: IIN, 200 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 20 ms / div.
Page 21 of 37
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DER-386 9 W Buck LED Power Supply Using LNK306DG
05-Dec-13
10.4 Input and Output Voltage and Current Profiles
Figure 28 – 95 VAC / 60 Hz, 60 V LED String.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch3: IIN, 500 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 29 – 115 VAC / 60 Hz, 60 V LED String.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch3: IIN, 500 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 30 – 230 VAC / 60 Hz, 60 V LED String.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch3: IIN, 500 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 31 – 265 VAC / 60 Hz, 60 V LED String.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch3: IIN, 500 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
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Page 22 of 37
05-Dec-13
DER-386 9 W Buck LED Power Supply Using LNK306DG
10.5 Drain Voltage and Current Profile with Normal Operation then Output Short
As shown in the figure below, IOUT is measured on the load side to protect the current
probe used in the testing. (The significant peak current upon short in the output from the
discharge of output capacitor will affect the demagnetization of the current probe when
connected to shorted loop.)
Figure 32 – 95 VAC / 60 Hz, Normal Operation then
Output Short.
Ch1: VD-G, 100 V / div.
Ch2: VOUT, 20 V / div.
Ch3: IDRAIN, 0.5 A / div.
Ch4: IOUT-LED, 100 mA / div.
Time Scale: 5 ms / div.
Z3: IDRAIN, 0.2 A / div.
Zoom Time Scale: 5 s / div.
Page 23 of 37
Figure 33 – 265 VAC / 60 Hz, Normal Operation
then Output Short.
Ch1: VD-G, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch3: IDRAIN, 0.5 A / div.
Ch4: IOUT-LED, 100 mA / div.
Time Scale: 5 ms / div.
Z3: IDRAIN, 0.2 A / div.
Zoom Time Scale: 5 s / div.
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DER-386 9 W Buck LED Power Supply Using LNK306DG
05-Dec-13
10.6 Drain Voltage and Current Profile, Start-up with Output Shorted
Figure 34 – 95 VAC / 60 Hz, Normal Operation then
Output Short
Ch1: VD-G, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch3: IDRAIN, 0.2 A / div.
Ch4: IOUT-LED, 200 mA / div.
Time Scale: 1 ms / div.
Z3: IDRAIN, 0.1 A / div.
Zoom Time Scale: 20 s / div.
Figure 35 –265 VAC / 60 Hz, Normal Operation
then Output Short
Ch1: VD-G, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch3: IDRAIN, 0.2 A / div.
Ch4: IOUT-LED, 200 mA / div.
Time Scale: 1 ms / div.
Z3: IDRAIN, 0.2 A / div.
Zoom Time Scale: 20 s / div.
10.7 No-Load Operation
This LED driver is protected from no-load through the output Zener diode. Replace VR1
after fault.
Figure 36 – 95 VAC / 60 Hz, Start-up No-load.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch4: IOUT-LED, 200 mA / div.
Time Scale: 50 ms / div.
Power Integrations, Inc.
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Figure 37 – 265 VAC / 50 Hz, Start-up No-load.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch4: IOUT-LED, 200 mA / div.
Time Scale: 50 ms / div.
Page 24 of 37
05-Dec-13
DER-386 9 W Buck LED Power Supply Using LNK306DG
10.8 AC Cycle
Advantage of a buck converter as compared to other topologies is the fast start-up; the
output capacitor is charge as soon as AC input is present.
Figure 38 – 115 VAC / 50 Hz,
50 ms On – 50 ms Off.
Load: 60 V LED String.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 200 ms / div.
Figure 39 – 115 VAC / 50 Hz,
100 ms On – 100 ms Off.
Load: 60 V LED String.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 200 ms / div.
Figure 40 – 115 VAC / 50 Hz,
150 ms On – 150 ms Off.
Load: 60 V LED String.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 200 ms / div.
Figure 41 – 115 VAC / 50 Hz,
300 ms On – 300 ms Off.
Load: 60 V LED String.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 200 ms / div.
Page 25 of 37
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DER-386 9 W Buck LED Power Supply Using LNK306DG
Figure 42 – 115 VAC / 50 Hz,
500 ms On – 500 ms Off.
Load: 60 V LED String.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 200 ms / div.
Power Integrations, Inc.
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05-Dec-13
Figure 43 – 115 VAC / 50 Hz,
1 s On – 1 s Off.
Load: 60 V LED String.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 20 V / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 500 ms / div.
Page 26 of 37
05-Dec-13
DER-386 9 W Buck LED Power Supply Using LNK306DG
10.9 Brown-out
Input voltage slew rate of 0.5 V / s from 95-0-95 VAC / 50 Hz line input variation; no
failure observed.
Figure 44 – 90 VAC / 50 Hz, 230 V LED String.
1 s On – 1 s Off.
Load: 60 V LED String.
Ch1: VIN, 100 V / div.
Ch2: VOUT, 20 V / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 50 s / div.
Page 27 of 37
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DER-386 9 W Buck LED Power Supply Using LNK306DG
05-Dec-13
10.10 Line Surge Waveform
Figure 45 – 240 VAC / 60 Hz, 60 V Load,
VDS = 696 VPK.
(+)500 V Differential Surge at 90º.
Ch1: VBULK, 200 V / div.
Ch1: VS-G, 200 V / div.
Ch3: VD-S, 200 V / div.
Time Scale: 1 ms / div.
Figure 46 – 240 VAC / 60 Hz, 60 V Load,
VDS = 580 VPK.
(+)500 V Differential Surge at 0º.
Ch1: VBULK, 200 V / div.
Ch1: VS-G, 200 V / div.
Time Scale: 1 ms / div.
Figure 47 – 240 VAC / 60 Hz, 60 V Load,
VDS = 508 VPK.
(+)2.5 kV Differential Ring Surge at 90º.
Ch1: VBULK, 200 V / div.
Ch1: VS-G, 200 V / div.
Time Scale: 1 ms / div.
Figure 48 – 240 VAC / 60 Hz, 60 V Load,
VDS = 336 VPK.
(+)2.5 kV Differential Ring Surge at 0º.
Ch1: VBULK, 200 V / div.
Ch1: VS-G, 200 V / div.
Ch3: VD-S, 200 V / div.
Time Scale: 1 ms / div.
Power Integrations, Inc.
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Page 28 of 37
05-Dec-13
DER-386 9 W Buck LED Power Supply Using LNK306DG
11 Line Surge
Input voltage was set at 240 VAC / 60 Hz. Output was loaded with 60 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)
+500
-500
+500
-500
Input
Voltage
(VAC)
240
240
240
240
Injection
Location
L to N
L to N
L to N
L to N
Injection
Phase
(°)
0
270
90
180
Test Result
(Pass/Fail)
Pass
Pass
Pass
Pass
Differential input line ring surge testing was completed on one test unit to IEC61000-4-5.
Surge Level
(V)
+2500
-2500
+2500
-2500
Input
Voltage
(VAC)
240
240
240
240
Injection
Location
L to N
L to N
L to N
L to N
Injection
Phase
(°)
0
270
90
180
Test Result
(Pass/Fail)
Pass
Pass
Pass
Pass
Unit passes under all test conditions.
Page 29 of 37
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DER-386 9 W Buck LED Power Supply Using LNK306DG
05-Dec-13
12 Conducted EMI
12.1 Equipment:
Receiver:
Rohde & Schwartz
ESPI - Test Receiver (9 kHz – 3 GHz)
Model No: ESPI3
LISN:
Rohde & Schwartz
Two-Line-V-Network
Model No: ENV216
12.2 EMI Test Set-up
LED driver is placed in a conical metal housing (for self-ballasted lamps; CISPR15
Edition 7.2).
Figure 49 – Conducted Emissions Measurement Set-up
Showing Conical Ground Plane Inside which UUT was Mounted.
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Page 30 of 37
05-Dec-13
DER-386 9 W Buck LED Power Supply Using LNK306DG
Figure 50 – LED Driver is Enclosed in Temporary A19 Housing that is Mounted in the Conical Ground
Plane.
Page 31 of 37
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DER-386 9 W Buck LED Power Supply Using LNK306DG
05-Dec-13
12.3 EMI Test Result
Power Integrations
05.Sep 13 13:46
RBW
MT
9 kHz
500 ms
Att 10 dB AUTO
dBµV
100 kHz
120
EN55015Q
110
1 QP
CLRWR
LIMIT CHECK
1 MHz
PASS
10 MHz
SGL
100
90
2 AV
CLRWR
TDF
80
70
60
EN55015A
50
6DB
40
30
20
10
0
-10
-20
9 kHz
30 MHz
Figure 51 – Conducted EMI, 60 VOUT / 150 mA Steady-State Load, 115 VAC, 60 Hz, and EN55015 Limits.
Power Integrations, Inc.
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Page 32 of 37
05-Dec-13
Trace1:
DER-386 9 W Buck LED Power Supply Using LNK306DG
EDIT PEAK LIST (Final Measurement Results)
EN55015Q
Trace2:
EN55015A
Trace3:
---
TRACE
FREQUENCY
LEVEL dBµV
DELTA LIMIT dB
2
Average
10.6587398824 kHz
21.33
L1 gnd
2
Average
67.1676282959 kHz
16.90
L1 gnd
2
Average
122.023208575 kHz
15.47
L1 gnd
2
Average
133.454986145 kHz
24.74
L1 gnd
2
Average
137.49880568 kHz
14.73
L1 gnd
2
Average
200.175581485 kHz
32.62
L1 gnd
-20.97
1
Quasi Peak
264.49018761 kHz
42.45
N gnd
-18.83
2
Average
267.135089486 kHz
33.76
N gnd
-17.43
1
Quasi Peak
397.727746704 kHz
40.57
N gnd
-17.32
2
Average
687.48218373 kHz
34.49
N gnd
-11.51
1
Quasi Peak
715.396717193 kHz
43.16
N gnd
-12.83
1
Quasi Peak
917.447639259 kHz
39.10
N gnd
-16.89
2
Average
2.11629733595 MHz
27.57
L1 gnd
-18.42
2
Average
9.32097576636 MHz
24.37
N gnd
-25.62
Figure 52 – Conducted EMI, 60 V / 150 mA Steady-State Load Steady-State Load, 115 VAC, 60 Hz, and
EN55015 Limits. Line and Neutral Scan Design Margin Measurement.
Page 33 of 37
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DER-386 9 W Buck LED Power Supply Using LNK306DG
Power Integrations
05.Sep 13 12:56
RBW
MT
05-Dec-13
9 kHz
500 ms
Att 10 dB AUTO
dBµV
100 kHz
120
EN55015Q
110
1 QP
CLRWR
LIMIT CHECK
1 MHz
PASS
10 MHz
SGL
100
90
2 AV
CLRWR
TDF
80
70
60
EN55015A
50
6DB
40
30
20
10
0
-10
-20
9 kHz
30 MHz
Figure 53 – Conducted EMI, 60 VOUT / 150 mA Steady-State Load, 230 VAC, 60 Hz, and EN55015 Limits.
Power Integrations, Inc.
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Page 34 of 37
05-Dec-13
Trace1:
DER-386 9 W Buck LED Power Supply Using LNK306DG
EDIT PEAK LIST (Final Measurement Results)
EN55015Q
Trace2:
EN55015A
Trace3:
---
TRACE
FREQUENCY
LEVEL dBµV
DELTA LIMIT dB
2
Average
134.789536006 kHz
36.79
N gnd
2
Average
153.015 kHz
38.95
N gnd
-16.88
1
Quasi Peak
162.428505844 kHz
50.15
N gnd
-15.18
1
Quasi Peak
202.1773373 kHz
53.72
N gnd
-9.79
2
Average
202.1773373 kHz
42.40
N gnd
-11.11
2
Average
267.135089486 kHz
37.48
N gnd
-13.71
1
Quasi Peak
280.761663784 kHz
48.27
L1 gnd
-12.52
2
Average
332.507282579 kHz
34.74
N gnd
-14.64
1
Quasi Peak
525.514079005 kHz
48.59
N gnd
-7.40
2
Average
530.769219795 kHz
36.58
N gnd
-9.41
1
Quasi Peak
604.06488251 kHz
49.22
N gnd
-6.77
2
Average
610.105531335 kHz
36.93
N gnd
-9.06
1
Quasi Peak
687.48218373 kHz
48.45
N gnd
-7.54
2
Average
722.550684365 kHz
39.76
N gnd
-6.23
1
Quasi Peak
872.919948931 kHz
46.19
N gnd
-9.80
2
Average
872.919948931 kHz
35.33
N gnd
-10.66
1
Quasi Peak
954.699692378 kHz
47.21
N gnd
-8.78
1
Quasi Peak
1.02356729084 MHz
46.33
N gnd
-9.66
1
Quasi Peak
1.23658080545 MHz
45.25
N gnd
-10.74
2
Average
2.20222749414 MHz
33.25
N gnd
-12.74
Figure 54 – Conducted EMI, 60 V / 150 mA Steady-State Load Steady-State Load, 230 VAC, 60 Hz, and
EN55015 Limits. Line and Neutral Scan Design Margin Measurement.
Page 35 of 37
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DER-386 9 W Buck LED Power Supply Using LNK306DG
05-Dec-13
13 Revision History
Date
05-Dec-13
Author
JDC
Revision
1.0
Description and Changes
Initial Release
Power Integrations, Inc.
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Reviewed
Apps & Mktg
Page 36 of 37
05-Dec-13
DER-386 9 W Buck LED Power Supply Using LNK306DG
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.
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HiperTFS, HiperLCS, Qspeed, EcoSmart, Clampless, E-Shield, Filterfuse, StackFET, PI Expert and PI FACTS are trademarks of
Power Integrations, Inc. Other trademarks are property of their respective companies. ©Copyright 2013 Power Integrations,
Inc.
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