Design Example Report

Design Example Report
Title
20 W High Efficiency >86% TRIAC Dimmable
Power Factor Corrected Isolated Flyback LED
Driver Using LYTSwitchTM -4 LYT4324E
Specification
185 VAC – 265 VAC Input;
36 VTYPICAL, 550 mA Output
Application
PAR38 Lamp Replacement
Author
Applications Engineering Department
Document
Number
DER-396
Date
September 25, 2013
Revision
1.0
Summary and Features










Single-stage power factor corrected with accurate constant current (CC) output (+5%)
PF >0.9 at 230 VAC
%A THD <20% at 230 VAC
Consistent dimming performance across production and over temperature range
Low cost, low component count and small PCB footprint design
Highly energy efficient, >86 % at 230 VAC input
Fast start-up time (<250 ms) – no perceptible delay
Clean monotonic start-up – no output blinking
Integrated protection and reliability features
 No-load protection, short-circuit protected
 Auto-recovering thermal shutdown with large hysteresis protects both components and PCB
 No damage during line brown-out conditions
Meets IEC 2.5 kV ring wave, 500 V 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
5245 Hellyer Avenue, San Jose, CA 95138 USA.
Tel: +1 408 414 9200 Fax: +1 408 414 9201
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
Table of Contents
1 2 3 Introduction ................................................................................................................. 4 Populated PCB ........................................................................................................... 5 Power Supply Specifications ...................................................................................... 7 3.1 Schematic............................................................................................................ 8 4 Circuit Description ...................................................................................................... 9 4.1 Input Stage .......................................................................................................... 9 4.2 Damping Stage .................................................................................................... 9 4.3 LYTSwitch-4 Primary ......................................................................................... 10 4.4 Output Feedback ............................................................................................... 11 4.5 Disconnected Load Protection........................................................................... 11 4.6 Overload and Short-Circuit Protection ............................................................... 11 5 PCB Layout and Outline ........................................................................................... 12 6 Bill of Materials ......................................................................................................... 13 7 Transformer (T1) Specification ................................................................................. 15 7.1 Electrical Diagram ............................................................................................. 15 7.2 Electrical Specifications ..................................................................................... 15 7.3 Materials ............................................................................................................ 15 7.4 Build Diagram .................................................................................................... 16 7.5 Construction ...................................................................................................... 16 8 Differential Inductor (L1) Specification ...................................................................... 18 8.1 Build Diagram .................................................................................................... 18 8.2 Electrical Specifications ..................................................................................... 18 8.3 Materials ............................................................................................................ 18 8.4 Build Diagram .................................................................................................... 19 8.5 Construction ...................................................................................................... 19 9 U1 Heat Sink ............................................................................................................ 20 9.1 U1 Heat Sink Fabrication Drawing .................................................................... 20 9.2 U1 Heat Sink Assembly Drawing ....................................................................... 21 9.3 Heat Sink and U1 Assembly Drawing ................................................................ 22 10 Transformer Design Spreadsheet ......................................................................... 23 11 Performance Data ................................................................................................. 26 11.1 Active Mode Efficiency ...................................................................................... 27 11.2 Line Regulation ................................................................................................. 28 11.3 Power Factor ..................................................................................................... 29 11.4 %THD ................................................................................................................ 30 11.5 Harmonic Content ............................................................................................. 31 11.6 Harmonic Measurements .................................................................................. 32 11.7 Dimming Characteristic ..................................................................................... 33 11.8 Unit to Dimmer Compatibility ............................................................................. 36 12 Thermal Performance ........................................................................................... 37 13 Waveforms ............................................................................................................ 39 13.1 Drain Voltage and Current, Normal Operation................................................... 39 13.2 Drain Voltage and Current Start-up Profile ........................................................ 39 13.3 Output Voltage Start-up Profile.......................................................................... 40 Power Integrations, Inc.
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DER-396 20 W Flyback LED Driver Using LYT4324E
13.4 Input and Output Voltage and Current Profiles ..................................................40 13.5 Drain Voltage and Current Profile: Normal Operation to Output Short...............41 13.6 Drain Voltage and Current Profile: Start-up with Output Shorted .......................42 13.7 No-Load Operation ............................................................................................42 13.8 AC Cycling .........................................................................................................43 13.9 Dimming Waveforms .........................................................................................44 13.10 Line Surge Waveform ....................................................................................56 13.10.1 Differential Line Surge ............................................................................56 13.10.2 Differential Ring Surge ............................................................................56 14 Line Surge .............................................................................................................57 15 Conducted EMI .....................................................................................................58 15.1 Equipment .........................................................................................................58 15.2 EMI Test Set-up .................................................................................................58 15.3 EMI Test Result .................................................................................................59 16 Revision History ....................................................................................................61 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.
Page 3 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
1 Introduction
This document is an engineering report describing an isolated power factor dimmable
LED driver (power supply) utilizing a LYT4324E from the LYTSwitch-4 High Line Family
of devices.
The DER-396 provides a single 20 W (36 VTYPICAL) dimmable 550 mA constant current
output across an input voltage range of 185 to 265 VAC.
The key design goals were high efficiency to maximize efficacy and small size. This
allowed the driver to fit into PAR38 sized lamps and be as close to a production ready
design as possible.
LYTSwitch-4 ICs allow the implementation of cost effective, low component count LED
drivers which meet both power factor and harmonics limits. The LYTSwitch-4 driver IC,
combines the PFC function and secondary output constant current control circuitry into a
single switching stage.
The topology used is an isolated flyback operating in continuous conduction mode.
Output current regulation is achieved entirely from the primary side, eliminating the need
for secondary feedback components. No external current sensing is required on the
primary side as this is performed inside the IC, further reducing component costs and
improving efficiency. The internal controller adjusts the power MOSFET duty cycle to
maintain a sinusoidal input current with high power factor and low harmonic current
control.
The LYT4324E also provides a sophisticated range of protection features including autorestart for open control loop and output short-circuit conditions. Line overvoltage provides
extended line fault and surge withstand, output overvoltage protects the supply should
the load be disconnected and accurate hysteretic thermal shutdown ensures safe
average PCB temperatures under all conditions.
In any LED luminaire the driver determines many of the performance attributes
experienced by the end user including startup time, dimming performance and unit to unit
consistency. This design was optimized to ensure operation with a wide range of
dimmers and as well as a wide dimming range.
The document contains the power supply specification, schematic, bill of materials,
transformer documentation, printed circuit layout, design spreadsheet and performance
data.
Power Integrations, Inc.
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25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
2 Populated PCB
Figure 1 – Populated Circuit Board (Top Side).
Figure 2 – Populated Circuit Board (Bottom Side).
Page 5 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
Figure 3 – Populated Circuit Board.
Dimensions: 2.68 in [68.1 mm] L x 1.32 in [33.6 mm] W x 1 in [25.4 mm] H.
Power Integrations, Inc.
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DER-396 20 W Flyback LED Driver Using LYT4324E
3 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
Power Factor
%ATHD
Output
Output Voltage
Output Current
Total Output Power
Continuous Output Power
Efficiency
Nominal
Symbol
Min
Typ
Max
Units
Comment
VIN
fLINE
185
47
230
50/60
0.9
265
63
VAC
Hz
2 Wire – no P.E.
At 230 VAC
17
VOUT
IOUT
33
522
36
550
39
577
V
mA
POUT
20
W

86
%
At 230 VAC
o
Measured at POUT 25 C at
230 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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DER-396 20 W Flyback LED Driver Using LYT4324E
3.1
25-Sep-13
Schematic
Figure 4 – Schematic for 36 V, 550 mA Replacement Lamp.
Power Integrations, Inc.
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DER-396 20 W Flyback LED Driver Using LYT4324E
4 Circuit Description
The LYTSwitch-4 (U1) is a family of highly integrated power ICs designed for use in LED
driver applications. The LYTSwitch-4 provides high power factor in a single-stage
conversion topology which also regulates the output current across the range of input
(185 VAC to 265 VAC) and output voltage variations typically encountered in LED driver
applications.
4.1 Input Stage
Fuse F1 provides protection against component failure. A fast 5 A rating was needed to
prevent false opening during line surges. Varistor RV1 provides a clamp to limit the
maximum voltage during differential line surge events. A 275 VAC rated part was
selected, being slightly above the maximum specified operating voltage (265 VAC). The
fast acting line overvoltage detection of LYTSwitch-4 in conjunction with D2 and C6 peak
detector capacitor provides a clamp to limit the maximum voltage stress across the power
MOSFET of the IC. In addition, during differential line-surge events where a high dv/dt is
detected through the RC high-pass filter R7, R8 and C2, Q2 will turn off Q3 and a voltage
proportional to the input current that will develop across the damper resistor R11 will be
subtracted from the input. This limits the voltage stress that appears on the DRAIN of U1.
Resistor R9 bleeds the charge from C2 and ensures Q2 is off during normal operation.
Differential choke L1 is the front end EMI filter to suppress noise. Resistor R3 damps the
resonance of the EMI filter if needed.
The AC input is full wave rectified by BR1 to achieve good power factor and low THD.
Capacitor C4, C5 and Common mode choke L2 form an EMI filter after the bridge. Filter
capacitance is limited to maintain high power factor. This input  filter network plus the
frequency jittering feature of LYTSwitch-4 allows compliance with Class B emission limits.
Resistor R12 dampens the resonance of the EMI filter if needed, preventing peaks in the
EMI spectrum when measured in a system (driver plus enclosure).
4.2 Damping Stage
To provide output dimming with low cost, TRIAC-based, leading-edge phase dimmers
introduced a number of tradeoffs in the design. Due to the much lower power consumed
by LED based lighting (compared to traditional incandescent bulbs) the current drawn by
the lamp is below the holding current of the TRIAC within the dimmer. This causes
undesirable behaviors such as limited dimming range and/or flickering caused by the
TRIAC firing inconsistently. The relatively large impedance that the LED lamp presents to
the line allows significant ringing to occur as result of the inrush current charging the input
capacitance when the TRIAC turns on. This too can cause similar undesirable behavior
as ringing may cause the TRIAC current to fall to zero (and turn the TRIAC off). To
overcome these issues two circuits, the active damper and passive bleeder were
incorporated. The drawback of these circuits is increased dissipation and therefore
Page 9 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
reduced efficiency of the supply. For non-dimming application these components can
simply be omitted.
The active damper consists of components R4, R5, R6, R10, D1, Q1, C3, VR1 and Q3 in
conjunction with R11. This circuit limits the inrush current that flows to charge C3 when
the TRIAC turns on by placing R11 in series for the first 1 ms of the conduction period.
After approximately 1 ms, Q3 turns on and shorts R11. This keeps the power dissipation
on R11 low and allows a larger value to be used for current limiting. Resistor R4, R5, R6
and C3 provide a 1 ms delay after the TRIAC conducts. Transistor Q1 discharges C3
when the TRIAC is not conducting; VR1 clamps the gate voltage of Q3 to 15 V while R10
prevents MOSFET oscillation. Q3 will remain on when no TRIAC dimmer is connected,
thus bypassing R11 for higher efficiency.
Passive RC bleeder (C1, R1, R2, R27 and R28) were positioned right after the fuse to
minimize the inrush current during dimming through the EMI inductor thereby minimizing
the audible noise. Four bleeder resistors were used to split the power loss especially at
90º conduction angle of dimmers and in order to have a compact form factor. This keeps
the input current above the TRIAC holding current while the input current corresponding
to the driver increases during each AC half-cycle preventing the TRIAC oscillating on and
off at the start of each conduction angle period.
4.3 LYTSwitch-4 Primary
One side of the transformer (T1) is connected to the DC bus and the other to the DRAIN
(D) pin of the LYTSwitch-4 IC. During the on-time of the power MOSFET, current ramps
through the primary storing energy which is then delivered to the output during the power
MOSFET off time. An RM7 core size was selected due to its small board area footprint.
As the bobbin did not meet the 6.2 mm safety creepage distance required for 230 VAC
operations. Flying leads were used to terminate the secondary winding into the PC board.
To provide peak line voltage information to U1, the incoming rectified AC peak charges
C6 via D2. This is then fed into the VOLTAGE MONITOR (V) pin of U1 as a current via
R14 and R15. The resistor tolerance will cause V pin current variation unit to unit so 1%
resistor types were selected to minimize this variation. The V pin current is also used by
the device to set the line input overvoltage thresholds. Resistor R13 provides a discharge
path for C6 with a time constant much longer than that of the rectified AC to prevent the V
pin current being modulated at the line frequency.
The V pin current and the FEEDBACK (FB) pin current are used internally to control the
average output LED current. A 24.9 k resistor is used on the R pin (R18) and 4 M
(R14+R15) on the V pin to provide a linear relationship between input voltage and the
output current and maximizing the dim range.
During the power MOSFET on-time, diode D4 is necessary to prevent reverse current
from flowing through U1 while the voltage across C5 falls to below the reflected output
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DER-396 20 W Flyback LED Driver Using LYT4324E
voltage (VOR). During transient operation VRCD snubber diode D3, VR4 and C7 clamps
the drain voltage to a safe level due to the effects of leakage inductance.
Diode D6, C9, C11, R21 and R22 generate a primary bias supply from an auxiliary
winding on the transformer. Capacitor C8 provides local decoupling for the BYPASS (BP)
pin of U1 which is the supply pin for the internal controller. During start-up C8 is charged
to ~6 V from an internal high-voltage current source tied to the DRAIN pin. This allows
the part to start switching at which point the operating supply current is provided from the
bias supply via R19. Diode D5 isolates the BP pin from C8 to prevent the start-up time
increase due to charging of both C9 and C11.
The use of an external bias supply (via D5 and R19) is recommended to give the lowest
device dissipation and highest efficiency and extended dimming performance.
Capacitor C8 also selects the output power mode, 100 F was selected for reduced
power mode to minimize the device dissipation and minimize heat sinking requirement.
Although 47 F is the minimum recommended bypass capacitor value, when using a
SMD ceramic type capacitor 68 F – 100 F / X5R is recommended to allow for
capacitance tolerance.
4.4 Output Feedback
The bias winding voltage is used to sense the output voltage indirectly, eliminating
secondary-side feedback components. The voltage on the bias winding is proportional to
the output voltage (set by the turn ratio between the bias and secondary windings).
Resistor R20 converts the bias voltage into a current, which is fed into the FB pin of U1.
The internal engine within U1 combines the FB pin current, the V pin current, and internal
drain current information to provide a constant output current while maintaining high input
power factor.
4.5 Disconnected Load Protection
The reference design is protected against accidental LED load disconnection such as in
the production. The controller will operate in auto-restart mode in order to prevent
damage to the output capacitor on the board by limiting the output voltage via the
reflected voltage from the auxiliary winding of the inductor, rectification of D7 and peak
filtering of C12. The unit enters auto-restart operation when Q4 turns on pulling current
from the FB pin, with Zener diode VR2 setting the overvoltage limit.
4.6 Overload and Short-Circuit Protection
The sample is protected against overload and short-circuit via primary current limit.
During short, primary current will build-up until it reaches current limit. Refer to shortcircuit waveforms for more illustration.
Page 11 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
5 PCB Layout and Outline
Figure 5 – Top Printed Circuit Layout.
Figure 6 – Bottom Printed Circuit Layout.
Power Integrations, Inc.
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DER-396 20 W Flyback LED Driver Using LYT4324E
6 Bill of Materials
The table below is the reference design BOM.
Item
Qty
Ref Des
2
1
C1
Description
1000 V, 0.8 A, Bridge Rectifier, SMD, MBS-1,
4-SOIC
220 nF, 275 VAC, Film, X2
1
1
BR1
3
1
C2
47 pF, 1000 V, Ceramic, NPO, 0805
3
1
C3
22 nF 50 V, Ceramic, X7R, 0603
4
1
C4
5
1
6
7
Mfg Part Number
Manufacturer
B10S-G
Comchip
LE224-M
OKAYA
VJ0805A470JXGAT5Z
Vishay
C1608X7R1H223K
TDK
120 nF, 400 V, Film
ECQ-E4124KF
Panasonic
C5
220 nF, 400 V, Film
ECQ-E4224KF
Panasonic
1
C6
2.2 F, 400 V, Electrolytic, (6.3 x 11)
TAB2GM2R2E110
Ltec
1
C7
2.2 nF, 630 V, Ceramic, X7R, 1206
C3216X7R2J222K
TDK
8
1
C8
3216X5R1C105M
TDK
9
1
C9
EKZE500ELL560MF11D
Nippon Chemi-Con
10
1
C10
100 F, 16 V, X5R, 1206
56 F, 50 V, Electrolytic, Very Low ESR, 140
m, (6.3 x 11)
10 nF 50 V, Ceramic, X7R, 0603
C0603C103K5RACTU
Kemet
11
1
C11
100 nF, 50 V, Ceramic, X7R, 0805
CC0805KRX7R9BB104
Yageo
12
1
C12
100 nF 50 V, Ceramic, X7R, 0603
C1608X7R1H104K
TDK
13
1
C13
100 pF, 200 V, Ceramic, COG, 0805
08052A101JAT2A
AVX
14
2
C14 C15
330 F, 63 V, Electrolytic, (10 x 20)
EKMG630ELL331MJ20S
United Chemi-con
15
1
CD95-B2GA471KYNS
TDK
16
3
250 V, 0.2 A, Fast Switching, 50 ns, SOD-323
BAV21WS-7-F
Diodes, Inc.
400 V, 1 A, DIODE SUP FAST 1A PWRDI 123
DFLU1400-7
Diodes, Inc.
US1J-13-F
Diodes, Inc.
17
1
CY1
D1 D6
D7
D2
470 pF, 250 VAC, Film, X1Y1
18
1
D3
DIODE ULTRA FAST, SW 600 V, 1 A, SMA
19
1
D4
DIODE ULTRA FAST, SW, 200 V, 1 A, SMA
20
1
D5
21
1
D8
22
1
F1
75 V, 0.15 A, Switching, SOD-323
200 V, 8 A, Ultrafast Recovery, 25 ns, TO220AC
5 A, 250 V, Fast, Microfuse, Axial
23
1
L1
Custom, RM5, Vertical, 6 pins
24
1
L2
5 mH, 0.5 A, Common Mode Choke Vertical
SU9VF-05050
Tokin
25
1
Q1
MMBT3906LT1G
On Semi
36
1
Q2
MMBT4401LT1G
Diodes, Inc.
26
1
Q3
PNP, Small Signal BJT, 40 V, 0.2 A, SOT-23
NPN, Small Signal BJT, GP SS, 40 V, 0.6 A,
SOT-23
400 V, 3.1 A,N-Channel, TO-251AA
IRFU320PBF
Vishay
27
1
NPN, Small Signal BJT, 40 V, 0.2 A, SOT-23
MMBT3904LT1G
On Semi
28
4
510 , 5%, 1 W, Thick Film, 2512
ERJ-1TYJ511U
Panasonic
12 k, 5%, 1/8 W, Thick Film, 0805
ERJ-6GEYJ123V
Panasonic
1 M, 5%, 1/4 W, Thick Film, 1206
ERJ-8GEYJ105V
Panasonic
US1D-13-F
Diodes, Inc.
BAV16WS-7-F
Diodes, Inc.
BYW29-200G
On Semi
0263005.MXL
Littlefuse
SNX-R1688
Santronics USA
29
1
Q4
R1 R2
R27 R28
R3
30
2
R4 R5
31
1
R6
2.4 M, 5%, 1/8 W, Thick Film, 0805
ERJ-6GEYJ245V
Panasonic
32
1
R7
162 k, 1%, 1/4 W, Thick Film, 1206
ERJ-8ENF1623V
Panasonic
33
1
R8
162 k, 1%, 1/4 W, Thick Film, 1206
ERJ-8ENF1623V
Panasonic
34
1
R9
30.1 k, 1%, 1/16 W, Thick Film, 0603
ERJ-3EKF3012V
Panasonic
35
1
R10
15 , 5%, 1/10 W, Thick Film, 0603
ERJ-3GEYJ150V
Panasonic
36
1
R11
240 , 5%, 2 W, Metal Oxide
RSF200JB-240R
Yageo
37
1
R12
47 k, 5%, 1/4 W, Thick Film, 1206
ERJ-8GEYJ473V
Panasonic
38
1
R13
510 k, 5%, 1/8 W, Thick Film, 0805
ERJ-6GEYJ514V
Panasonic
39
2
R14 R15
2.0 M, 1%, 1/4 W, Thick Film, 1206
ERJ-8ENF2004V
Panasonic
40
1
R17
200 k, 5%, 1/4 W, Thick Film, 1206
ERJ-8GEYJ204V
Panasonic
41
1
R18
24.9 k, 1%, 1/16 W, Thick Film, 0603
ERJ-3EKF2492V
Panasonic
Page 13 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
Item
Qty
Ref Des
Description
Mfg Part Number
Manufacturer
42
1
R19
6.2 k, 5%, 1/4 W, Thick Film, 1206
ERJ-8GEYJ622V
Panasonic
43
1
R20
133 k, 1%, 1/8 W, Thick Film, 0805
ERJ-6ENF1333V
Panasonic
44
1
R21
20 k, 5%, 1/8 W, Thick Film, 0805
ERJ-6GEYJ203V
Panasonic
45
1
R22
39 , 5%, 1/8 W, Thick Film, 0805
ERJ-6GEYJ390V
Panasonic
46
1
R23
10 , 5%, 1/10 W, Thick Film, 0603
ERJ-3GEYJ100V
Panasonic
47
1
R24
1 k, 5%, 1/10 W, Thick Film, 0603
ERJ-3GEYJ102V
Panasonic
48
1
R25
30 , 5%, 1/4 W, Thick Film, 1206
ERJ-8GEYJ300V
Panasonic
49
1
R26
7.5 k, 5%, 1/4 W, Thick Film, 1206
ERJ-8GEYJ752V
Panasonic
50
1
RV1
V130LA20AP
Littlefuse
51
1
T1
250 V, 21 J, 7 mm, RADIAL LA
Custom, RM7/I, Vertical, 8 pins with mtg clip
CLI/P-RM7
LYTSwitch-4, eSIP-7C
SNX-R1689
Santronics USA
LYT4324E
Power Integrations
1N5245B-T
Diodes, Inc.
52
1
U1
53
1
VR1
15 V, 5%, 500 mW, DO-35
54
1
VR2
33 V, 5%, 200 mW, SOD-323
55
1
VR4
200 V, 400 W, SMA
MMSZ5257BS-7-F
Diodes, Inc.
SMAJ200A-13-F
Diodes, Inc.
Custom
Custom
CLP212SG
Aavid Thermalloy
TFT20-NT
Custom Cut
Mechanical BOM
1
1
2
1
3
6
HS1
POWER
CLIP1
Insulation
Tubing
Heat sink, Custom, Al, 3003, 0.062" Thk
Heat sink Hardware, Edge Clip 21N (4.7 lbs) 10
mm L x 7 mm W x 0.5 mm H
15 mm; PTTFE AWG #20 TW Tubing
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Page 14 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
7 Transformer (T1) Specification
7.1
Electrical Diagram
Figure 7 – Transformer Electrical Diagram.
7.2
Electrical Specifications
Primary Inductance
Pins 1-7, all other windings open, measured at 100 kHz, 0.4 VRMS.
1 mH ±7%
Resonant Frequency
Pins 1-7, all other windings open.
1000 kHz
(Min.)
7.3
Materials
Item
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
Description
Core: RM7; 3F3.
Bobbin: Rm-7; 4/4 pin vertical.
Clip: EPCOS, KlammerRM7, Manufacture P/N: B65820B2001X.
Magnet Wire: #33 AWG, double coated.
Magnet Wire: #26 TIW, triple insulated.
Magnet Wire: #34 AWG, double coated.
Tape: 3M 1298 Polyester Film, 7.0.mm wide, 2.0 mil thick or equivalent.
Tape: 3M 1298 Polyester Film, 18.0.mm x 30.0.mm, 2.0.mil thick or equivalent.
Varnish: Dolph BC-359, or equivalent.
Page 15 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
7.4
25-Sep-13
Build Diagram
Figure 8 – Transformer Build Diagram.
7.5
Construction
Winding Preparation
Note: pin-out of bobbin is designated as in picture below.
Place the bobbin item [1] on the mandrel with the pin side is on the left.
Winding direction is clockwise direction.
Winding 1
Start at pin 7, wind 31 turns of wire item [4] from left to right for the 1st layer
and place 1 layer of tape item [6]. Continue winding another 31 turns for the
2nd layer, from right to left and also place 1 layer of tape item [7]. Then wind 26
turns for the 3rd layer from left to right, at the last turn bring the wire back to the
left and terminate at pin 1.
Insulation
Place 1 layer of tape item [7].
Winding 2
Use wire item [5], leave ~ 25 mm floating and place a piece of small tape to
mark it as start lead FL1. Wind 32 turns of wire in 3 layers and 3 turns on the
4th layer on the right side of bobbin, at the last turn bring the wire back to the
left and also leave ~ 25 mm floating as end lead FL2.
Insulation
Place 1 layer of tape item [7].
Winding 3
Now wind 25 turns of wire item [6] on the left section of 4th layer from winding
2, start at pin 6 and end with pin 8.
Insulation
Place 2 layers of tape item [7] to secure windings.
Final Assembly
Grind core halves item [2] to get 1 mH and secure with clips item [3]
Cut short FL1 to 24 mm and FL2 to 12 mm.
Cut ground lead of clip item [3] on the left side of core halves, see picture
below.
Prepare tape item [8].
Wrap 2 layers of tape item [8] on the left side of core halves for insulation.
Varnish with item [9].
Cut pin number 2, 3 and 5.
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Page 16 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
Figure 9 – Transformer Assembly Illustration.
Page 17 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
8 Differential Inductor (L1) Specification
8.1
Build Diagram
Figure 10 – Inductor Electrical Diagram.
8.2
Electrical Specifications
Primary Inductance
8.3
Pins 1-2, all other windings open, measured at 100 kHz, 0.4 VRMS.
240 H ±10%
Materials
Item
[1]
[2]
[3]
[4]
[5]
Description
Core: RM5 (3/3); N87.
Bobbin: RM-5; 3/3 pin vertical.
Magnet Wire: #35 AWG.
Tape: 3M 1298 Polyester Film, 4.8 mm wide, 2.0 mil thick or equivalent.
Varnish: Dolph BC-359, or equivalent.
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25-Sep-13
8.4
DER-396 20 W Flyback LED Driver Using LYT4324E
Build Diagram
Figure 11 – Inductor Build Diagram.
8.5
Construction
Winding
Preparation
Note: pin-out of bobbin is designated as in picture below.
Place the bobbin item [1] on the mandrel with the pin side is on the left.
Winding direction is clockwise direction.
Winding 1
Start at pin 2, wind 150 turns of wire item [3] continuously then terminate at pin 1.
Insulation
Place 3 layer of tape item [4].
Winding 2
Start at pin 4, wind 150 turns of wire item [3] continuously then terminate at pin 3.
Insulation
Place 2 layers of tape item [4] to secure windings.
Final Assembly
Page 19 of 62
Grind core halves item [2] to get 1 mH and secure with clips.
Varnish with item [5]. Cut pin 5 and 6.
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
9 U1 Heat Sink
9.1
U1 Heat Sink Fabrication Drawing
Figure 12 – U1 Heat Sink Fabrication Drawing.
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25-Sep-13
9.2
DER-396 20 W Flyback LED Driver Using LYT4324E
U1 Heat Sink Assembly Drawing
Figure 13 – U1 Heat Sink Assembly Drawing.
Page 21 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
9.3
25-Sep-13
Heat Sink and U1 Assembly Drawing
Figure 14 – Heat Sink and U1 Assembly Drawing.
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Page 22 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
10 Transformer Design Spreadsheet
ACDC_LYTSwitch4_HL_062013; Rev.1.0;
INPUT INFO
Copyright Power
Integrations 2013
ENTER APPLICATION VARIABLES
Dimming required
OUTPUT
YES
YES
VACMIN
185
VACMAX
fL
VO
36
VO_MAX
VO_MIN
V_OVP
IO
0.55
PO
n
VB
ENTER LYTSwitch VARIABLES
LYTSwitch
Auto
185
265
50
36
39.6
32.4
42.47
0.55
19.8
0.8
25
Current Limit Mode
ILIMITMIN
ILIMITMAX
fS
fSmin
fSmax
IV
RV
RV2
IFB
RFB1
VDS
RED
UNIT
LYTSwitch-4_HL_062013: Flyback Transformer
Design Spreadsheet
V
V
Hz
V
V
V
V
A
W
DER-396
Select 'YES' option if dimming is required.
Otherwise select 'NO'.
Minimum AC Input Voltage
Maximum AC input voltage
AC Mains Frequency
Typical output voltage of LED string at full load
Maximum expected LED string Voltage.
Minimum expected LED string Voltage.
Over-voltage protection setpoint
Typical full load LED current
Output Power
Estimated efficiency of operation
Bias Voltage
V
LYT4324
RED
0.95
1.11
132000
124000
140000
80.56727984
4
1E+12
178
123.5955056
10
A
A
Hz
Hz
Hz
uA
M-ohms
M-ohms
uA
k-ohms
V
VD
0.5
V
VDB
Key Design Parameters
0.7
V
KP
178
0.7
0.7
LP
998.2376383
VOR
92
92
Expected IO (average)
0.547777905
KP_VNOM
0.666138709
TON_MIN
1.493186757
PCLAMP
0.159394306
ENTER TRANSFORMER CORE/CONSTRUCTION VARIABLES
Core Type
RM7
RM7
Custom Core
RM7
AE
0.45
0.45
LE
3
3
AL
2500
2500
BW
6.9
6.9
M
Page 23 of 62
0
uH
V
A
us
W
cm^2
cm
nH/T^2
mm
mm
Selected LYTSwitch
Select "RED" for reduced Current Limit mode or
"FULL" for Full current limit mode
Minimum current limit
Maximum current limit
Switching Frequency
Minimum Switching Frequency
Maximum Switching Frequency
V pin current
Upper V pin resistor
Lower V pin resistor
FB pin current (85 uA < IFB < 210 uA)
FB pin resistor
LYTSwitch on-state Drain to Source Voltage
Output Winding Diode Forward Voltage Drop (0.5
V for Schottky and 0.8 V for PN diode)
Bias Winding Diode Forward Voltage Drop
Ripple to Peak Current Ratio (For PF > 0.9, 0.4 <
KP < 0.9)
Primary Inductance
Reflected Output Voltage.
Expected Average Output Current
Expected ripple current ratio at VACNOM
Minimum on time at maximum AC input voltage
Estimated dissipation in primary clamp
Select Core Size
Enter Custom core part number (if applicable)
Core Effective Cross Sectional Area
Core Effective Path Length
Ungapped Core Effective Inductance
Bobbin Physical Winding Width
Safety Margin Width (Half the Primary to
Secondary Creepage Distance)
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DER-396 20 W Flyback LED Driver Using LYT4324E
L
4
4
NS
35
35
DC INPUT VOLTAGE PARAMETERS
VMIN
261.629509
VMAX
374.766594
CURRENT WAVEFORM SHAPE PARAMETERS
DMAX
0.267730208
IAVG
0.119116476
A
IP
0.826177997
A
IRMS
0.231970815
A
TRANSFORMER PRIMARY DESIGN PARAMETERS
LP
998.2376383
LP_TOL
10
10
NP
88.21917808
NB
24.64383562
ALG
128.2649294
BM
2077.457006
BP
2791.138572
25-Sep-13
Number of Primary Layers
Number of Secondary Turns
V
V
Peak input voltage at VACMIN
Peak input voltage at VACMAX
Minimum duty cycle at peak of VACMIN
Average Primary Current
Peak Primary Current (calculated at minimum input
voltage VACMIN)
Primary RMS Current (calculated at minimum input
voltage VACMIN)
Primary Inductance
Tolerance of primary inductance
Primary Winding Number of Turns
Bias Winding Number of Turns
nH/T^2
Gapped Core Effective Inductance
Gauss
Maximum Flux Density at PO, VMIN (BM<3100)
Gauss
Peak Flux Density (BP<3700)
AC Flux Density for Core Loss Curves (0.5 X Peak
BAC
727.109952
Gauss
to Peak)
ur
1326.288091
Relative Permeability of Ungapped Core
LG
0.418255474
mm
Gap Length (Lg > 0.1 mm)
BWE
27.6
mm
Effective Bobbin Width
Maximum Primary Wire Diameter including
OD
0.312857143
mm
insulation
Estimated Total Insulation Thickness (= 2 * film
INS
0.053423557
mm
thickness)
DIA
0.259433586
mm
Bare conductor diameter
Primary Wire Gauge (Rounded to next smaller
AWG
30
AWG
standard AWG value)
CM
101.5936673
Cmils
Bare conductor effective area in circular mils
Primary Winding Current Capacity (200 < CMA <
CMA
437.9588334
Cmils/Amp
600)
TRANSFORMER SECONDARY DESIGN PARAMETERS (SINGLE OUTPUT EQUIVALENT)
Lumped parameters
ISP
2.082421254
A
Peak Secondary Current
ISRMS
0.884132667
A
Secondary RMS Current
IRIPPLE
0.692235923
A
Output Capacitor RMS Ripple Current
CMS
176.8265334
Cmils
Secondary Bare Conductor minimum circular mils
Secondary Wire Gauge (Rounded up to next larger
AWGS
27
AWG
standard AWG value)
DIAS
0.362522298
mm
Secondary Minimum Bare Conductor Diameter
Secondary Maximum Outside Diameter for Triple
ODS
0.197142857
mm
Insulated Wire
VOLTAGE STRESS PARAMETERS
Estimated Maximum Drain Voltage assuming
VDRAIN
566.5923475
V
maximum LED string voltage (Includes Effect of
Leakage Inductance)
Output Rectifier Maximum Peak Inverse Voltage
PIVS
191.1564827
V
(calculated at VOVP, excludes leakage inductance
spike)
Bias Rectifier Maximum Peak Inverse Voltage
PIVB
134.1846154
V
(calculated at VOVP, excludes leakage inductance
spike)
FINE TUNING (Enter measured values from prototype)
V pin Resistor Fine Tuning
RV1
4
M-ohms
Upper V Pin Resistor Value
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uH
Page 24 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
RV2
VAC1
VAC2
IO_VAC1
IO_VAC2
RV1 (new)
RV2 (new)
1E+12
115
230
0.55
0.55
4.000604137
20911.63067
M-ohms
V
V
A
A
M-ohms
M-ohms
V_OV
319.5673531
V
V_UV
66.34665276
V
133
1E+12
22.46520548
27.53479452
0.55
0.55
133
1E+12
k-ohms
k-ohms
V
V
A
A
k-ohms
k-ohms
Max Current (mA)
Limit (mA)
3rd Harmonic
20.69736113
1666.17
5th Harmonic
9.233940611
931.095
7th Harmonic
5.592928806
490.05
9th Harmonic
3.956638292
245.025
11th Harmonic
2.979917621
171.5175
13th Harmonic
2.264929473
145.103805
15th Harmonic
1.69769565
125.74683
THD
23.53869833
%
FB pin resistor Fine Tuning
RFB1
133
RFB2
VB1
VB2
IO1
IO2
RFB1 (new)
RFB2(new)
Input Current Harmonic Analysis
Harmonic
1st Harmonic
Lower V Pin Resistor Value
Test Input Voltage Condition1
Test Input Voltage Condition2
Measured Output Current at VAC1
Measured Output Current at VAC2
New RV1
New RV2
Typical AC input voltage at which OV shutdown will
be triggered
Typical AC input voltage beyond which power
supply can startup
Upper FB Pin Resistor Value
Lower FB Pin Resistor Value
Test Bias Voltage Condition1
Test Bias Voltage Condition2
Measured Output Current at Vb1
Measured Output Current at Vb2
New RFB1
New RFB2
PASS. 3rd Harmonic current content is lower than
the limit
PASS. 5th Harmonic current content is lower than
the limit
PASS. 7th Harmonic current content is lower than
the limit
PASS. 9th Harmonic current content is lower than
the limit
PASS. 11th Harmonic current content is lower than
the limit
PASS. 13th Harmonic current content is lower than
the limit
PASS. 15th Harmonic current content is lower than
the limit
Estimated total Harmonic Distortion (THD)
Table 1 – Sample Spreadsheet Calculation.
Page 25 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
11 Performance Data
All measurements performed at 25 ºC room temperature, 60 Hz input frequency unless
otherwise specified.
Input
VAC Freq
(VRMS) (Hz)
VIN
(VRMS)
Input Measurement
IIN
PIN
PF
(mARMS) (W)
%ATHD
LED Load Measurement
VOUT
IOUT
POUT
(VDC)
(mADC)
(W)
Efficiency
(%)
185
50
184.85
140.39
24.969
0.962
15.62
39.1500
547.700
21.540
86.27
200
50
199.85
131.37
24.997
0.952
16.49
39.1100
549.800
21.610
86.45
220
50
219.90
121.59
25.016
0.936
17.59
39.0800
551.000
21.620
86.42
230
50
229.85
117.51
25.020
0.926
17.91
39.0500
551.000
21.610
86.37
240
50
239.88
113.83
25.028
0.917
18.01
39.0300
551.000
21.590
86.26
265
50
264.92
106.00
24.935
0.888
18.04
38.9900
547.000
21.410
85.86
185
50
184.84
130.63
23.130
0.958
15.76
35.9000
552.000
19.910
86.08
200
50
199.85
122.72
23.227
0.947
16.46
35.8900
555.000
20.030
86.24
220
50
219.91
114.31
23.363
0.929
17.27
35.8900
558.000
20.150
86.25
230
50
229.85
110.76
23.412
0.920
17.44
35.8900
559.000
20.170
86.15
240
50
239.88
107.35
23.399
0.909
17.55
35.8800
558.000
20.130
86.03
265
50
264.92
100.60
23.399
0.878
17.49
35.8600
556.000
20.030
85.60
185
50
184.85
122.49
21.580
0.953
16.09
33.2300
555.000
18.570
86.05
200
50
199.86
115.48
21.724
0.941
16.6
33.2100
560.000
18.720
86.17
220
50
219.91
107.91
21.887
0.922
17.17
33.1900
564.000
18.850
86.12
230
50
229.85
104.54
21.898
0.911
17.31
33.1700
564.000
18.840
86.04
240
50
239.89
101.58
21.922
0.900
17.27
33.1400
565.000
18.830
85.90
265
50
264.93
95.77
21.991
0.867
17.11
33.1200
564.000
18.790
85.44
Table 2 – Test Result Summary for this Design.
Power Integrations, Inc.
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Page 26 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
11.1 Active Mode Efficiency
87.1
39 VDC Output
36 VDC Output
33 VDC Output
86.8
Efficiency (%)
86.5
86.2
85.9
85.6
85.3
85.0
175
185
195
205
215
225
235
245
255
265
AC Input Voltage (VRMS / 50Hz)
Figure 15 – Efficiency with Respect to AC Input Voltage.
Page 27 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
11.2 Line Regulation
10
33 VDC Output
36 VDC Output
8
39 VDC Output
6
Regulation (%)
4
2
0
-2
-4
-6
-8
-10
175
185
195
205
215
225
235
245
255
265
275
AC Input Voltage (VRMS / 50Hz)
Figure 16 – Line Regulation, Room Temperature.
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Page 28 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
11.3 Power Factor
1.00
39 VDC Output
36 VDC Output
33 VDC Output
0.98
Power Factor (PF)
0.96
0.94
0.92
0.90
0.88
0.86
0.84
0.82
0.80
175
185
195
205
215
225
235
245
255
265
AC Input Voltage (VRMS / 50 Hz)
Figure 17 – High Power Factor within the Operating Range.
Page 29 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
11.4 %THD
35
33 VDC Output
36 VDC Output
39 VDC Output
30
THD (%)
25
20
15
10
5
0
175
185
195
205
215
225
235
245
255
265
275
AC Input Voltage (VRMS / 50 Hz)
Figure 18 – Very Low %ATHD.
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Page 30 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
11.5 Harmonic Content
90
Limit
36 VDC Output
80
Harmonic Content (mA)
70
60
50
40
30
20
10
0
3
5
7
9
11 13 15 17 19 21 23 25 27 29 31 33 35 37 39
Harmonic Order
Figure 19 – Meets EN61000-3-2 Harmonics Contents Standards for <25 W Rating for 36 V LED Output.
Page 31 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
11.6 Harmonic Measurements
VAC
(VRMS)
230
nth
Order
1
2
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
Freq
(Hz)
50.00
mA
Content
109.04
0.02
14.21
8.15
5.16
4.75
3.34
3.24
2.14
2.15
1.36
1.39
0.96
0.96
0.87
0.81
0.83
0.76
0.83
0.70
0.78
0.59
0.68
0.50
0.64
0.44
I (mA)
P
PF
110.76
%
Content
23.4120
Limit (mA)
<25 W
0.9197
0.02%
13.03%
7.47%
4.73%
4.36%
3.06%
2.97%
1.96%
1.97%
1.25%
1.27%
0.88%
0.88%
0.80%
0.74%
0.76%
0.70%
0.76%
0.64%
0.72%
0.54%
0.62%
0.46%
0.59%
0.40%
79.6008
44.4828
23.4120
11.7060
8.1942
6.9336
6.0091
5.3021
4.7440
4.2922
3.9190
3.6054
3.3384
3.1081
2.9076
2.7314
2.5753
2.4361
2.3112
Remarks
27.59%
10.00%
7.00%
5.00%
3.00%
3.00%
3.00%
3.00%
3.00%
3.00%
3.00%
3.00%
3.00%
3.00%
3.00%
3.00%
3.00%
3.00%
3.00%
Table 3 – 230 VAC Input Current Harmonic Measurement for 36 V LED.
Power Integrations, Inc.
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Page 32 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
11.7 Dimming Characteristic
The dimming characteristic was taken from a controlled AC supply to emulate the TRIAC conduction
pattern. The reference design meets the dimming requirement as set by National Electrical Manufacturers
Association (NEMA) Standards Publication SSL 1-2010 (Electronic Drivers for LED Devices, Arrays or
Systems) and SSL 6-2010(Solid Light Lighting for Incandescent Replacement-Dimming).
700
Dim to Full Brightness
NEMA Light Output Upper Limit
NEMA Light Output Lower Limit
600
Output Current (A)
500
400
300
200
100
0
0
20
40
60
80
100
120
140
160
Phase Angle Conduction (º)
Page 33 of 62
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180
DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
600
180-0 LYT4324E
0-180 LYT4324E
Output Current (mA)
500
400
300
200
100
0
0
20
40
60
80
100
120
140
160
180
Conduction Angle ()
Figure 20 – Dimming Curve Characteristic From Full Dim to Full Brightness. Meets NEMA SSL 6-2010.
Power Integrations, Inc.
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Page 34 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
600
Full Brightness to Dim
400
300
200
100
0
240
220
200
180
160
140
120
100
80
60
40
20
0
Effective RMS Input Voltage During Dimming (VAC)
Figure 21 – Dimming Characteristic with Respect to RMS Input Voltage During Dimming.
Page 35 of 62
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Output Current (A)
500
DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
11.8 Unit to Dimmer Compatibility
These are the list of dimmers verified for this reference design. Users are not limited on
the following list. Make sure to test the dimmers according to its recommended operating
line input frequency to avoid flicker.
Dimmer Origin
Part Number
China
China
China
China
China
China
China
China
Korea
Korea
Korea
Korea
Germany
Germany
Germany
Germany
Germany
Germany
Germany
Germany
Germany
Germany
TCL 630 W
Sen Bo Lang
Eba Huang
SB elect 600 W
Myongbo
KBE 650 W
Clipmei
Mank 200 W
Anam 500 W
Shin Sung
Fantasia 500 W
Shin Sung 2
Rev 300 W
Busch 2250 600 W
PEHA 400 W
Merten 572499 400 W
Busch 6513 420 W
Berker 2875 600 W
Ove
Busch 691 U-101
Busch 6513 U-102
Peha 433AB
Power Integrations, Inc.
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IMIN
(mA)
147.4
189.4
35.9
1.3
191.4
0.6
147.2
202.8
191.0
177.6
185.0
158.2
0.1
107.1
1.5
77.5
109.7
123.5
113.4
106.4
107.8
174.1
IMAX
(mA)
556.0
555.0
556.0
545.5
558.0
555.5
556.0
557.0
551.0
552.0
549.4
552.0
537.6
542.4
505.2
550.0
546.5
532.9
503.9
529.2
546.0
534.5
Dim Ratio
4
3
15
420
3
926
4
3
3
3
3
3
5376
5
337
7
5
4
4
5
5
3
Page 36 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
12 Thermal Performance
The scan is conducted at ambient temperature of 25 ºC open frame, 185 VAC / 50 Hz
input.
Figure 22 – Open Frame Thermal Scan
Legend:
Sp1 – Output Capacitor C14
Sp2 – Output Capacitor C15
Sp3 – Common Mode Inductor L2
Sp4 – Damper MOSFET Q3
Sp5 – Transformer T1.
Sp6 – Output Diode D8
Sp7 – Differential Inductor L1
Figure 23 – U1 LNK4314E Device Temperature.
Page 37 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
Figure 24 – Bottom Side Board Temperature at Open Frame.
Legend:
Sp1 – Bridge Rectifier BR1
Sp2 – Blocking Diode D4
Sp3 – Snubber Diode D3
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25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
13 Waveforms
13.1 Drain Voltage and Current, Normal Operation
No saturation in the inductor and designed guaranteed to work in continuous mode within
the operating input voltage.
Figure 25 – 185 VAC / 50 Hz, 36 V LED String.
Ch2: VDRAIN, 200 V / div.
Ch3: IDRAIN, 0.2 A / div.
Time Scale: 2 ms / div.
Zoom Time Scale: 2 s / div.
Figure 26 – 265 VAC / 50 Hz, 36 V LED String.
Ch2: VDRAIN, 200 V / div.
Ch3: IDRAIN, 0.2 A / div.
Time Scale: 2 ms / div.
Zoom Time Scale: 2 s / div.
13.2 Drain Voltage and Current Start-up Profile
Device has a built in soft start thereby reducing the stress in the device, transformer and
output diode .
Figure 27 – 185 VAC / 50 Hz, 36 V LED String.
Ch2: VDRAIN, 200 V / div.
Ch4: IDRAIN, 0.2 A / div.
Time Scale: 10 ms / div.
Zoom Time Scale: 10 s / div.
Page 39 of 62
Figure 28 – 265 VAC / 50 Hz, 36 V LED String.
Ch2: VDRAIN, 200 V / div.
Ch4: IDRAIN, 0.2 A / div.
Time Scale: 10 ms / div.
Zoom Time Scale: 10 s / div.
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
13.3 Output Voltage Start-up Profile
Start-up time <250 ms; the reference design will emit light within 250 ms at non-dimming
operation.
Figure 29 – 185 VAC / 50 Hz, 36 V LED
Ch1: VIN, 200 V / div.
Ch2: VOUT, 10 V / div.
Ch3: IIN, 200 mA / div.
Ch4: IOUT, 200 mA / div., 100 ms / div.
Figure 30 – 265 VAC / 50 Hz, 36 V LED
Ch1: VIN, 200 V / div.
Ch2: VOUT, 10 V / div.
Ch3: IIN, 200 mA / div.
Ch4: IOUT, 200 mA / div., 100 ms / div.
13.4 Input and Output Voltage and Current Profiles
Output current ripple is inversely proportional to the impedance of the LED. Verify the
actual current ripple on the actual LED to be used in the system. Increase output
capacitance for lesser output current ripple is intended.
Figure 31 – 185 VAC / 50 Hz, 36 V LED String.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 10 V / div.
Ch3: IIN, 200 mA / div.
Ch4: IOUT, 200 mA / div., 10 ms / div.
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Figure 32 – 220 VAC / 50 Hz, 36 V LED String.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 10 V / div.
Ch3: IIN, 200 mA / div.
Ch4: IOUT, 200 mA / div., 10 ms / div.
Page 40 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
Figure 33 – 240 VAC / 50 Hz, 36 V LED String.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 10 V / div.
Ch3: IIN, 200 mA / div.
Ch4: IOUT, 200 mA / div., 10 ms / div.
Figure 34 – 265 VAC / 50 Hz, 36 V LED String.
Ch1: VIN, 200 V / div.
Ch2: VOUT, 10 V / div.
Ch3: IIN, 200 mA / div.
Ch4: IOUT, 200 mA / div., 10 ms / div.
13.5 Drain Voltage and Current Profile: Normal Operation to Output Short
No saturation in the inductor during short-circuit, inductor current is limited by the ILIM.
Figure 35 – 185 VAC / 50 Hz, Normal Operation
then Output Short.
Ch1: VOUT, 20 V / div.
Ch2: VDS, 200 V / div.
Ch4: IDRAIN, 0.5 A / div., 10 ms / div.
Z3: IDRAIN, 0.2 A / div., 5 s / div.
Page 41 of 62
Figure 36 – 265 VAC / 50 Hz, Normal Operation
then Output Short.
Ch1: VOUT, 20 V / div.
Ch2: VDS, 200 V / div.
Ch4: IDRAIN, 0.5 A / div., 10 ms / div.
Z3: IDRAIN, 0.2 A / div., 5 s / div.
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
13.6 Drain Voltage and Current Profile: Start-up with Output Shorted
No saturation in the inductor during start-up short-circuit due to the built-in soft-start.
Figure 37 – 185 VAC / 50 Hz, Output Shorted.
Ch1: VDS, 20 V / div.
Ch3: IDRAIN, 0.2 A / div., 10 ms / div.
Z3: IDRAIN, 0.2 A / div., 10 s / div.
Figure 38 – 265 VAC / 50 Hz, Output Shorted.
Ch1: VDS, 20 V / div.
Ch3: IDRAIN, 0.2 A / div., 10 ms / div.
Z3: IDRAIN, 0.2 A / div., 10 s / div..
13.7 No-Load Operation
The driver is protected during no-load operation, U1 operating is cycle skipping mode.
Figure 39 – 185 VAC / 50 Hz, Start-up No-load.
Ch2: VOUT, 10 V / div.
Ch3: IDS, 0.1 A / div.
Time Scale: 2 s / div.
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Figure 40 – 265 VAC / 50 Hz, Start-up No-load.
Ch2: VOUT, 10 V / div.
Ch3: IDS, 0.1 A / div.
Time Scale: 2 s / div.
Page 42 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
13.8 AC Cycling
The reference design has no perceptible delay.
Figure 41 – 240 VAC / 50 Hz,
300 ms On – 300 ms Off.
Load: 36 V LED String.
Ch1: VIN, 200 V / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 1 s / div.
Figure 42 – 240 VAC / 50 Hz,
500 ms On – 500 ms Off.
Load: 36 V LED String.
Ch1: VIN, 200 V / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 1 s / div.
Figure 43 – 240 VAC / 50 Hz,
1s On – 1s Off.
Load: 36 V LED String.
Ch1: VIN, 200 V / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 1 s / div.
Figure 44 – 240 VAC / 50 Hz,
2s On – 2s Off.
Load: 36 V LED String.
Ch1: VIN, 200 V / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 1 s / div.
Page 43 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
13.9 Dimming Waveforms
Figure 45 – 240 VAC / 50 Hz, (China) TCL 630 W
Dimmer at Full TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 46 – 240 VAC / 50 Hz, (China) TCL 630 W
Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 47 – 240 VAC / 50 Hz, (China) Sen Bo Lang
300 W Dimmer at Full TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 48 – 240 VAC / 50 Hz, (China) Sen Bo Lang
300 W Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
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Page 44 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
Figure 49 – 240 VAC / 50 Hz, (China) Eba Huang
Dimmer at Full TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 51 – 240 VAC / 50 Hz, (China) SB elect 600 W
Dimmer at Full TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Page 45 of 62
Figure 50 – 240 VAC / 50 Hz, (China) Eba Huang
Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 52 – 240 VAC / 50 Hz, (China) SB elect 600 W
Dimmer at Minimum TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
Figure 53 – 240 VAC / 50 Hz, (China) Myongbo
Dimmer at Full TRIAC conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 54 – 240 VAC / 50 Hz, (China) Myongbo
Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 55 – 240 VAC / 50 Hz, (China) KBE, 650 W
Dimmer at Full TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 56 – 240 VAC / 50 Hz, (China) KBE, 650 W
Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Power Integrations, Inc.
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Page 46 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
Figure 57 – 240 VAC / 50 Hz, (China) Clipmei
Dimmer at Full TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 58 – 240 VAC / 50 Hz, (China) Clipmei
Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 59 – 240 VAC / 50 Hz, (China) Mank 200 W
Dimmer at Full TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 60 – 240 VAC / 50 Hz, (China) Mank 200 W
Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Page 47 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
Figure 61 – 240 VAC / 50 Hz, (Korea) Anam,
500 W Dimmer at full TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 62 – 240 VAC / 50 Hz, (Korea) Anam,
500 W Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 63 – 240 VAC / 50 Hz, (Korea) Shin Sung
Dimmer at Full TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 64 – 240 VAC / 50 Hz, (Korea) Shin Sung
Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Power Integrations, Inc.
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Page 48 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
Figure 65 – 240 VAC / 50 Hz, (Korea) Fantasia
500 W Dimmer at Full TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 66 – 240 VAC / 50 Hz, (Korea) Fantasia
500 W Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 67 – 240 VAC / 50 Hz, (Korea) Shin Sung 2
Dimmer at Full TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 68 – 240 VAC / 50 Hz, (Korea) Shin Sung 2
Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Page 49 of 62
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DER-396 20 W Flyback LED Driver Using LYT4324E
Figure 69 – 240 VAC / 50 Hz, (Germany) Rev 300 W
Dimmer at Full TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 71 – 240 VAC / 50 Hz, (Germany) Busch
2250 600 W Dimmer at Full TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
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25-Sep-13
Figure 70 – 240 VAC / 50 Hz, (Germany) Rev 300 W
Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 72 – 240 VAC / 50 Hz, (Germany) Busch
2250 600 W Dimmer at Minimum
TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Page 50 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
Figure 73 – 240 VAC / 50 Hz, (Germany) PEHA
400 W Dimmer at Full TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 74 – 240 VAC / 50 Hz, (Germany) PEHA
400 W Dimmer at Minimum TRIAC
conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 75 – 240 VAC / 50 Hz, (Germany) Merten
572499, 400 W Dimmer at Full TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 76 – 240 VAC / 50 Hz, (Germany) Merten
572499, 400 W Dimmer at Minimum
TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
Figure 77 – 240 VAC / 50 Hz, (Germany) Busch
6513, 420 W Dimmer at Full TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 78 – 240 VAC / 50 Hz, (Germany) Busch
6513, 420 W Dimmer at Minimum
TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 79 – 240 VAC / 50 Hz, (Germany) Berker
2875, 600 W Dimmer at Full TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 80 – 240 VAC / 50 Hz, (Germany) Berker
2875, 600 W Dimmer at Minimum
TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Power Integrations, Inc.
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25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
Figure 81 – 240 VAC / 50 Hz, (Germany) Ove
Dimmer at Full TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 82 – 240 VAC / 50 Hz, (Germany) Ove
Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 83 – 240 VAC / 50 Hz, (Germany) Busch
691 U-101 Dimmer at Full TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 84 – 240 VAC / 50 Hz, (Germany) Busch
691 U-101 Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
Figure 85 – 240 VAC / 50 Hz, (Germany) Busch
6513 U102 Dimmer at Full TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 86 – 240 VAC / 50 Hz, (Germany) Busch
6513 U102 Dimmer at minimum
TRIAC Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 87 – 240 VAC / 50 Hz, (Germany) PEHA
433AB Dimmer at Full TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Figure 88 – 240 VAC / 50 Hz, (Germany) PEHA
433AB Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Power Integrations, Inc.
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Page 54 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
Figure 89 – 240 VAC / 50 Hz, (Germany) PEHA
433AB oA Dimmer at Full TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Page 55 of 62
Figure 90 – 240 VAC / 50 Hz, (Germany) PEHA
433AB oA Dimmer at Minimum TRIAC
Conduction.
Load: 36 V LED String.
Ch2: VIN, 200 V / div.
Ch3: IIN, 100 mA / div.
Ch4: IOUT, 100 mA / div.
Time Scale: 5 ms / div.
Power Integrations
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
13.10 Line Surge Waveform
13.10.1
Differential Line Surge
Figure 91 –265 VAC / 60 Hz, 36 V Load,
VDS = 591 VPK
(+) 500 V Diff. Line Surge at 90º.
Ch1: VDS, 200 V / div.
Ch2: IIN, 500 mA / div.
Time Scale: 1 s / div.
13.10.2
Figure 92 – 265 VAC / 50 Hz, 36 V Load,
VDS = 611 VPK
(+) 500 V Diff. Line Surge at 270º.
Ch1: VBULK, 100 V / div.
Ch2: VDS, 200 V / div.
Time Scale: 200 s / div.
Zoom Time Scale: 20 s / div.
Differential Ring Surge
Figure 93 –230 VAC / 60 Hz, 36 V Load,
VDS = 572 VPK
(+) 500 V Differential Ring Surge at 90º.
Ch1: VDS, 200 V / div.
Ch2: VBULK, 200 V / div.
Zoom Time Scale: 5 s / div.
Power Integrations, Inc.
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Figure 94 – 230 VAC / 60 Hz, 36 V Load,
VDS = 565 VPK
(+) 500 V Differential Ring Surge at 0º.
Ch1: VDS, 200 V / div.
Ch2: VBULK, 200 V / div.
Zoom Time Scale: 5 s / div.
Page 56 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
14 Line Surge
Input voltage was set at 230 VAC / 60 Hz. Output was loaded with 36 V LED string and
operation was verified following each surge event. Two units were verified in the following
conditions.
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)
120
120
120
120
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)
120
120
120
120
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 57 of 62
Power Integrations
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
15 Conducted EMI
15.1 Equipment
Receiver:
Rohde & Schwartz
ESPI - Test Receiver (9 kHz – 3 GHz)
Model No: ESPI3
LISN:
Rohde & Schwartz
Two-Line-V-Network
Model No: ENV216
15.2 EMI Test Set-up
Usually LED driver is placed in a conical metal housing (for self-ballasted lamps;
CISPR15 Edition 7.2) but since lamp housing is not available during the UUT was tested
then it was evaluated as shown in the figure below.
Figure 95 – Conducted Emissions Measurement Set-up.
Power Integrations, Inc.
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Page 58 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
15.3 EMI Test Result
Att 10 dB AUTO
dBµV
120
EN55015Q
110
1 QP
CLRWR
100 kHz
LIMIT CHECK
1 MHz
PASS
10 MHz
SGL
100
90
2 AV
CLRWR
TDF
80
70
60
50
EN55015A
6DB
40
30
20
10
0
-10
-20
9 kHz
30 MHz
Figure 96 – Conducted EMI, 36 V output / 550 mA Steady-State Load, 230 VAC, 60 Hz, and EN55015
Limits.
Page 59 of 62
Power Integrations
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DER-396 20 W Flyback LED Driver Using LYT4324E
Trace1:
25-Sep-13
EDIT PEAK LIST (Final Measurement Results)
EN55015Q
Trace2:
EN55015A
Trace3:
---
TRACE
FREQUENCY
LEVEL dBµV
DELTA LIMIT dB
2
Average
130.825395691 kHz
38.20
L1 gnd
1
Quasi Peak
133.454986145 kHz
64.55
L1 gnd
2
Average
133.454986145 kHz
64.29
N gnd
2
Average
136.137431366 kHz
24.88
L1 gnd
1
Quasi Peak
174.145343305 kHz
52.73
L1 gnd
-12.02
2
Average
200.175581485 kHz
35.00
N gnd
-18.60
1
Quasi Peak
208.303512797 kHz
50.42
L1 gnd
-12.85
1
Quasi Peak
227.818484195 kHz
50.65
N gnd
-11.87
1
Quasi Peak
246.694773277 kHz
50.50
L1 gnd
-11.36
1
Quasi Peak
254.169871602 kHz
51.18
N gnd
-10.43
2
Average
267.135089486 kHz
44.12
N gnd
-7.07
2
Average
401.705024172 kHz
36.36
N gnd
-11.45
1
Quasi Peak
434.988979109 kHz
45.29
L1 gnd
-11.86
2
Average
667.263434405 kHz
34.06
N gnd
-11.93
2
Average
798.145472681 kHz
35.73
N gnd
-10.26
1
Quasi Peak
3.76891518811 MHz
42.16
L1 gnd
-13.83
2
Average
3.76891518811 MHz
33.46
L1 gnd
-12.53
1
Quasi Peak
4.16322710559 MHz
45.25
L1 gnd
-10.74
2
Average
5.28619370567 MHz
41.89
N gnd
-8.10
1
Quasi Peak
5.55584271143 MHz
46.93
N gnd
-13.06
-16.50
Figure 97 – Conducted EMI, 36 V / 550 mA Steady-State Load Steady-State Load, 230 VAC, 60 Hz, and
EN55015 Limits / Line and Neutral Scan Design Margin Measurement.
Power Integrations, Inc.
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Page 60 of 62
25-Sep-13
DER-396 20 W Flyback LED Driver Using LYT4324E
16 Revision History
Date
25-Sep-13
Page 61 of 62
Author
ME
Revision
1.0
Description and Changes
Initial Release
Reviewed
Apps & Mktg
Power Integrations
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DER-396 20 W Flyback LED Driver Using LYT4324E
25-Sep-13
For the latest updates, visit our website: www.powerint.com
Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability.
Power Integrations does not assume any liability arising from the use of any device or circuit described herein. POWER
INTEGRATIONS MAKES NO WARRANTY HEREIN AND SPECIFICALLY DISCLAIMS ALL WARRANTIES INCLUDING,
WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE, AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS.
PATENT INFORMATION
The products and applications illustrated herein (including transformer construction and circuits’ external to the products)
may be covered by one or more U.S. and foreign patents, or potentially by pending U.S. and foreign patent applications
assigned to Power Integrations. A complete list of Power Integrations’ patents may be found at www.powerint.com. Power
Integrations grants its customers a license under certain patent rights as set forth at http://www.powerint.com/ip.htm.
The PI Logo, TOPSwitch, TinySwitch, LinkSwitch, LYTSwitch, DPA-Switch, PeakSwitch, CAPZero, SENZero, LinkZero, HiperPFS,
HiperTFS, HiperLCS, Qspeed, EcoSmart, Clampless, E-Shield, Filterfuse, StackFET, PI Expert and PI FACTS are trademarks of Power
Integrations, Inc. Other trademarks are property of their respective companies. ©Copyright 2013 Power Integrations, Inc.
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Page 62 of 62