Electronic transformer compatible step-down converter for 7W/10W MR16 lamp with ILD4001 & BSR302N 01_01 | Jul 23, 2013 | PDF | 1.1 mb

Electronic Transformer Compatible
Step-down Converter for 7W/10W MR16 Lamp with
ILD4001 & BSR302N
Application Note
Revision: 1.1
Date: 23 July 2013
Power Management and Multimarket
Edition 2013-07-23
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2013 Infineon Technologies
AG All Rights Reserved.
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PROPERTY RIGHTS OF ANY THIRD PARTY) WITH RESPECT TO ANY AND ALL INFORMATION GIVEN IN
THIS APPLICATION NOTE.
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Application Note AN-EVAL
Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N
Application Note AN-EVAL
Revision History: 23 July 2013
Previous Revision: Previous_Revision_Number
Page
Subjects (major changes since last revision)
Application Note AN-EVAL, 1.1
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ILD4001
Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N
Table of Contents
1
Introduction ..................................................................................................................................................... 5
2
Application Information............................................................................................................................... 6
3
Measurement Results .................................................................................................................................. 8
4
References ..................................................................................................................................................... 13
List of Figures
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
ILD4001 ............................................................................................................................................................. 5
Schematic of the demonstration board ........................................................................................................ 6
PCB layout of the demonstration board ....................................................................................................... 6
PCB photo of the 7 W demonstration board ............................................................................................... 7
PCB photo of the 10 W demonstration board ............................................................................................. 7
Output waveform for the 7 W MR16 board driven by Philips ET-E60. .................................................... 9
Output waveform for the 10 W MR16 board driven by Tridonic TE0060. ............................................. 10
Test setup of 3pcs of 10 W MR16 driven by Osram HTM105 ................................................................ 11
Output waveform for the 7 W MR16 board driven by Osram HTM105. ................................................ 12
List of Tables
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
MR16 7 W operating specification ................................................................................................................ 5
MR16 10 W operating specification .............................................................................................................. 6
Bill-of-Materials ................................................................................................................................................ 8
7 W board measurement results with Philips ET-E60. .............................................................................. 9
10 W board measurement results with Tridonic TE0060. ....................................................................... 10
3pcs of 7 W board measurement results with Osram HTM105. ............................................................ 11
Electronic transformers list .......................................................................................................................... 12
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Application Note AN-EVAL
Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N
1
Introduction
1.1
Features







Deliver 7 W / 10 W power 
Temperature shut down mechanism 
Compatible with electronic transformer 
Low LED current drift over temperature 
Integrated push-pull stage for fast on/off
switching 
Minimum external component required 
Small package: SC-74 
Figure 1
1.2
ILD4001
Description
This document contains the information about the demo board with the device ILD4001 LED driver which is
suitable for the use in an MR16 lamp.
ILD4001 is a hysteretic buck LED controller IC for industrial applications.
The demo board has two input connections to be powered up by 12 V AC from electronic transformer, and two
output connections to the LED. The boards are preset to deliver 7 W or 10 W powers into the LED load.
These MR16 boards are suitable and tested to drive 2 LEDs in series and 4 LEDs (2 LEDs in series and 2 in
parallel). For 4 LEDs design, it is recommended to use the LED with the same forward voltage to ensure the
current matching for the LEDs in parallel.
1.3
Operating specification
This demo board for MR16 application is based on the ILD4001 buck converter. The objective of this demo
board is to provide a constant DC current to the LED load in order to eliminate the flickering issue caused by the
electronic transformers.
Since the output current to the LEDs is constant DC current, regardless of the input voltage is either 12 V AC, 12
VDC or 12 VAC from electronic transformer, the MR16 board is able to maintain the constant current deliver to
the load. Therefore this solution is not only applicable to retrofit replacement market for 7 W and 10 W MR16
solutions; it is also suitable for the new installation market which generally using a constant voltage supply.
Below table are the MR16’s target specification driven by an electronic transformer:
Table 1
MR16 7 W operating specification
Input voltage to electronic transformer
Output LED voltage (2 LEDs in series)
Output LED current
230 VAC
6.5 V
0.77 A
Input Power
~7W
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Application Note AN-EVAL
Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N
Table 2
MR16 10 W operating specification
Input voltage to electronic transformer
Output LED voltage (2 LEDs in series)
230 VAC
6.6 V
Output LED current
Input Power
1.02 A
~ 10 W
2
Application Information
2.1
Schematic
Figure 2
Schematic of the demonstration board
The value of R1, R2, C1 and C2 are different for 7 W and 10 W boards. Please refer to Table 3. Bills of material
for details.
Figure 3
PCB layout of the demonstration board
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Application Note AN-EVAL
Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N
2.2
PCB Photo for 7 W Application
Figure 4
PCB photo of the 7 W demonstration board
2.3
PCB Photo for 10 W Application
Figure 5
PCB photo of the 10 W demonstration board
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Application Note AN-EVAL
Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N
Table 3
Bill-of-Materials
Symbol
Value
IC1
ILD4001
R1
0.15
1
2
Open / 0.47
R2
R5
D1 ~ D5
Q1
C1
Unit
10
B330A-13-F
470 / 330
1
2
2
Manufacturer
Comment
SC-74
INFINEON
Hysteretic Buck controller and LED driver
Ω
0805
Part of the current sense resistor
Ω
kΩ
0805
0805
SMA
Part of the current sense resistor
DIODES
3.0 A Surface Mount Schottky Barrier
Rectifier
SC-59
INFINEON
OPTIMOS 2 Small Signal Transistor
BSR302N
1
Size
Gate resistor

F
Electrolytic capacitor, 25 V
F
Electrolytic capacitor, 25 V
C2
C4
Open / 330
4.7
F
0805
Ceramic, 50 V
C5
10
F
0805
Ceramic, 50 V
R1
0.56
Ω
0805
SMD resistor
R2
L1
0.56
2.7
Ω
H
0805
3 x 4 mm
SMD resistor
TAIYO YUDEN
Inductor
L2
33
H
8 x 8 mm
TAIYO YUDEN
Shielded Power Inductor
The demo boards are available for evaluation. For the 7 W board, the board name is “MR16 7W BOARD” and the
product ID is “SP000960028”. For the 10 W board, the board name is “MR16 10W BOARD” and the product
ID is “SP000960030”. Please contact your local sales representative to order the demo boards.
3
Measurement Results
3.1
Driven by electronic transformer
The MR16 boards were tested with different brand of electronic transformers in the market. In this session,
some of the measurement results and output waveform of the LED load will be shown. 3 cases are chosen to be
included in this application note are:
1. 7 W MR16 driven by Philips ET-E60.
2. 10 W MR16 driven by Tridonic TE0060.
3. 3pcs of 7 W MR16 driven by Osram HTM105.
The electronic transformers list will be provided in session 3.5.
1
2
For 7 W version
For 10 W version
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Application Note AN-EVAL
Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N
3.2
7 W MR16 driven by Philips ET-E60
The 7 W MR16 board were tested with the Philips’s electronic transformer. Below tables and figures show
the measurement results for the MR16 board driven by the electronic transformer. The test was carried out
using 2 pcs of LEDs in series as load and the temperature condition at room temp 25°C.
For the input power measurement, the input power is measured at the input mains 230 V AC by using the digital
power meter WT210. The output power is measured by the oscilloscope with the mathematic function by
multiplication of the LED voltage and LED current.
Figure 6 shows the output waveforms. Channel 1 (Yellow) is Vf of the LEDs, Channel 2 (Green) is ILED and
Channel M (Purple) is output power.
Table 4
7 W board measurement results with Philips ET-E60.
230 VAC
Input voltage to electronic transformer
V
f(avg)
I
LED(avg)
P
in
P
6.45 V
777 mA
6.94 W
5.08 W
73.2 %
out
Efficiency
Figure 6
Output waveform for the 7 W MR16 board driven by Philips ET-E60.
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Application Note AN-EVAL
Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N
3.3
10 W MR16 driven by Tridonic TE0060
A single 10 W MR16 were tested with Tridonic TE0060 and the results as shown in Table 5 and Figure 7. The
load condition and temperature condition are the same in session 3.2. The measurement of input power and
output power are also the same as in session 3.2.
Table 5
10 W board measurement results with Tridonic TE0060.
230 VAC
Input voltage to electronic transformer
V
f(avg)
I
LED(avg)
P
in
P
6.63 V
1.05 A
9.8 W
7.1 W
72.4 %
out
Efficiency
Figure 7
Output waveform for the 10 W MR16 board driven by Tridonic TE0060.
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Application Note AN-EVAL
Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N
3.4
3pcs of 7 W MR16 driven by Osram HTM105
3pcs of 7 W MR16 were tested with an Osram HTM105. The temperature condition is at room temp 25°C. The
setup is shown in Figure 8.
The input power is directly measured at the power supply source by power meter WT210. In this case, the total
output power is measured each lamp individually and sum up together, i.e. P out = Pout1 + Pout2 + Pout3. In fact
the output power of each lamp is not exactly the same due to the forward voltage of the LEDs are different.
Figure 9 shows the single channel output waveform of the 7 W MR16 lamp. The overall system efficiency for
this case is 74%. The Osram HTM105 is suitable to drive 1, 2 or up to 3 pcs of 7 W MR16 lamp without any
flickering issue. For 10 W MR16, it could drive up to maximum of 2 lamps.
Figure 8
Table 6
Test setup of 3pcs of 10 W MR16 driven by Osram HTM105
3pcs of 7 W board measurement results with Osram HTM105.
230 VAC
Input voltage to electronic transformer
V
f(avg)
I
LED(avg)
P
in
P
6.62 V
775 mA
21.83 W
16.17 W
74 %
out
Efficiency
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Application Note AN-EVAL
Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N
Figure 9
Output waveform for the 7 W MR16 board driven by Osram HTM105.
3.5
Electronic transformer list
The 7 W and 10 W MR16 boards are tested and compatible with below electronic transformers. The number
indicated in the table represents the number of MR16 lamp can be driven by the electronic transformer.
For a 60W rated electronic transformer, it can only drive a 7 W MR16 or 10 W MR16. The reason is because the
7 W MR16 is to replace a 35 W halogen bulb, so it can only be 1 to 1 replacement. It is also applicable to 10 W
MR16 for the replacement of a 50 W halogen bulb.
For the Osram HTM105, the power rated at 105W. It is capable to drive either 3 pcs of 35 W halogen bulb or 2
pcs of 50W halogen bulb. Therefore, for the retrofit MR16 replacement, it is also suitable to drive 3 pcs of 7 W
MR16 or 2 pcs of 10 W MR16.
Dimmer list IS
NOT
included in this application note as this solution is not meant for dimmable solution.
Magnetic transformer list IS ALSO NOT included in this application note as this solution has not been tested with the
magnetic transformer in the lab.
Table 7
Electronic transformers list
E- transformer Model
Philips ET-E60
Osram ET-A60
Osram HTM 105
Tridonic TE-0060
Application Note AN-EVAL, 1.1
7 W MR16
10 W MR16
1
1
1
1
1,2 or 3
1
1 or 2
1
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23 July 2013
Application Note AN-EVAL
Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N
4
References
Please refer to the ILD4001 Datasheet for more information:
http://www.infineon.com/dgdl/ILD4001-Step-down-LED-ControllerRev2.0.pdf?folderId=db3a30431f848401011fcbf2ab4c04c4&fileId=db3a30433072cd8f01308fc1af03786b
Please refer to the AN213 Application note for more information:
http://www.infineon.com/dgdl/AN213.pdf?folderId=db3a304313b8b5a60113d4239297042f&fileId=db3a304330d
d34290130e5572ce63ea5
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