40W LED Street and Indoor Lighting

BCR4 50, TDA48 63
40W LED Street an d Ind oor li ghtin g
de mons trator boa rd
Application Note AN186
Revision: 1.0
Date: 18.12.2009
www.infineon.com/lighting
RF and Protecti on Devi c es
Edition 18.12.2009
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2009 Infineon Technologies AG
All Rights Reserved.
Legal Disclaimer
The information given in this document shall in no event be regarded as a guarantee of conditions or
characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any
information regarding the application of the device, Infineon Technologies hereby disclaims any and all
warranties and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual
property rights of any third party.
Information
For further information on technology, delivery terms and conditions and prices, please contact the nearest
Infineon Technologies Office (www.infineon.com).
Warnings
Due to technical requirements, components may contain dangerous substances. For information on the types in
question, please contact the nearest Infineon Technologies Office.
Infineon Technologies components may be used in life-support devices or systems only with the express written
approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the
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support devices or systems are intended to be implanted in the human body or to support and/or maintain and
sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other
persons may be endangered.
Application Note AN186
40W LED Street and Indoor lighting demonstrator board
Application Note AN186
Revision History: 18.12.2009
Previous Revision: Previous_Revision_Number
Page
Subjects (major changes since last revision)
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Application Note AN186
40W LED Street and Indoor lighting demonstrator board
Content - AN186
1
Demonstrator board description ......................................................................................................5
2
Key parameters ..................................................................................................................................5
3
Advantages of this solution ..............................................................................................................6
4
Demonstrator board functionality ....................................................................................................6
5
LED Section ........................................................................................................................................7
6
Demonstrator board measurements and characteristics ..............................................................8
7
BCR450 - Linear LED driver for high current LED driving...........................................................12
8
BCR450 LED strip application schematic......................................................................................15
Appendix - Application Note EVALLED-TDA4863G-40W
Single Stage High PF Flyback Converter for Offline LED Supply
2
Evaluation Board……………………………………………………………………………………………17
3
List of Features……………………………………………………………………………………………...17
4
Technical Specification……………………………………………………………………………………18
5
Operation……………………………………………………………………………………………………..18
5.1
Basic Operation………………………………………………………………………………………………18
5.2
Output Control …...............................................................................................................................19
6
Setup and Results…………………………………………………………………………………………..19
6.1
Input/ Output Connector description…………………………………………………………...…………..19
6.1.1
J1 – Vin………………………………………………………………………………………………………...20
6.1.2
VCC…………………………………………………………………………………………………………....20
6.1.3
GND……………………………………………………………………………………………………………20
6.1.4
REFGND………………………………………………………………………………………………………20
6.2
Setup…………………………………………………………………………………………………………...20
6.3
Power Up………………………………………………………………………………………………………20
6.4.
Output Ripple……………………………………………………………………………….…………………21
6.5
Efficiency………………………………………………………………………………………………………21
6.6
Power Factor Correction……………………………………………………………………………………..22
6.7
EMI……………………………………………………………………………………………………………..24
7
Board Layout…………………………………………………………………………………………………25
8
Schematic and BOM………………………………………………………………………………………...27
8.1
Schematic……………………………………………………………………………………………………...27
8.2.
Bill of Materials………………………………………………………………………………………………..28
8.3.
Transformer…………………………………………………………………………………………………….29
References……………………………………………………………………………………………………30
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Application Note AN186
40W LED Street and Indoor lighting demonstrator board
1
Demonstrator board description
This demo board shows a 40W offline AC-to-DC LED driving solution with power factor
correction. The isolated concept ensures easy and safe installation and maintenance for
street lights and Indoor lighting fixtures.
The design utilizes a three step approach with a universal input PFC IC stage on the primary
side, a current and voltage controller IC to set the DC voltage required for the LED strings
and a linear LED driver IC in combination with an external booster transistor for each string to
supply the LEDs with constant current.
Dimming of the LEDs is possible via applying a PWM signal to a dedicated pin of the LED
strings, which controls the output current.
The modular concept allows extending the number of LED strings attached to the secondary
side to realize street lighting designs with higher output power.
In case of higher output power the primary side has to be modified to improve PF correction,
as the power factor correction is optimized to 40W output power.
Figure 1
40W LED Street and Indoor lighting board picture
2
Key parameters
Supply voltage:
Output voltage on secondary side:
Output current:
LED type:
Efficiency:
Power Factor:
Application Note AN186, 1.0
90-270VAC
~23VDC
350mA
OSRAM Golden Dragon Plus
up to 87%
> 0.90
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Application Note AN186
40W LED Street and Indoor lighting demonstrator board
3
Advantages of this solution
„ Cost competitive due to low-cost IC approach
„ Low part count on primary and secondary side
„ Low EMI due to linear driving concepnt on the secondary side
„ Easy to implement and maintain
4
Demonstrator board functionality
The TDA4863 is used as a flyback controller and power factor correction in a single stage.
On the secondary side the voltage regulator – TLE4305 provides constant-current, constantvoltage feedback to the TDA4863 via an optocoupler.
The TLE4305 sets the required voltage for the LED strings through a reference string: The
sum of the forward voltage Vf of the LED‘s in the reference string plus a resistor, that
simulates the voltage drop at the linear LED driver IC, and provides exactly this voltage to all
LED strings. Figure 2 shows the basic application schematic of this demo board.
BCR450 LED strip
Figure 2
Basic Application Schematic
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Application Note AN186
40W LED Street and Indoor lighting demonstrator board
Except for the reference string, all LEDs are driven by the linear LED driver BCR450 with the
external booster transistor BCX68-25. This circuitry enables to use a high featured and low
cost linear LED driver like BCR450 very efficiently.
5
LED Section
5.1
Vf LED forward voltage
A different LED forward voltage value Vf than the above mentioned 3.2V will have no impact
on the system, as long as all LEDs used in the system are from the same batch, thus having
the same Vf . If the sum of Vf in the reference string is lower than Vf in the BCR450 strings,
the system will not work.
In case different forward voltages one must take care that the sum of Vf in the reference
string is equal or higher than the sum of Vf in the following parallel BCR450 strings.
A short calculation example:
The reference string uses 7 LEDs with a Vf of 3.2V. The resistor simulates a voltage drop of
1.0V Æ The TLE4305 sets the voltage to 7 x 3.2V + 1.0V = 23.4V
In the following BCR450 LED strings Vf is lower, for example 3.0V. The BCR450 + BCX68-25
have a voltage drop of 0.5V.
Æ 7 x 3.0V + 0.5V = 21.5V
This means 0,67W (1.9V x 350mA) will be dissipated at the external transistor BCX68-25.
The 0.67W power dissipation are in spec, as the BCX68-25 is designed for a maximum
power dissipation of 3W,
More details on choosing the external transistor can be found in section 6.3 The BCR450
high current concept.
5.2
Choosing lower- or higher-power LEDs
This demo board uses OSRAM Golden Dragon Plus, driven at 350mA which represents the
typical drive current for 1W LEDs. It is possible to choose LEDs with lower currents (e.g.
0.5W LEDs with 150mA) or LEDs with higher currents (e.g. 3W LEDs with 700mA).
This requires a change on the BCR450 LED strip circuit:
The changes to be made are described in Application Note AN105, section: 4.1. Calculation
of the base voltage divider, which can be found In the application document section at
www.infineon.com/lowcostleddriver or via direct link: AN105
5.3
Dimming of the LEDs in the strings
Dimming of the LEDs in the BCR450 LED strings is possible by applying a PWM signal, e.g.
from a microcontroller. The BCR450 has a digital input pin that is able to process PWM
signals with a frequency of up to 200Hz.
Dimming of the first string, the reference string, is not possible as the TLE4305 regulates
voltage and current, and will react to the change in current by a PWM signal.
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Application Note AN186
40W LED Street and Indoor lighting demonstrator board
6
Demonstrator board measurements and characteristics
6.1
Efficiency
This diagram shows the AC to DC conversion efficiency, as well as the BCR450 LED strip
efficiency on the DC side. The combination of both results in the overall efficiency from the
main to the LEDs.
Efficiency vs Input Voltage
100
Overall
Eff.
Efficiency [%]
95
90
ACDC
Eff.
85
80
BCR450
LED strip
eff.
75
70
90
140
190
240
Input Voltage [Vac]
Figure 3
Efficiency vs. Input voltage at 20W output power
As shown in figure 3, the AC-DC conversion efficiency is at 91% at 230V AC
for 20W output power.
Efficiency of the BCR450 LED strings: constant at 96%.
Multiplication of these 2 values leads to the overall system efficiency for 230V: 87%
Overall system efficiency with 110V supply voltage is 85%.
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40W LED Street and Indoor lighting demonstrator board
6.2
Power factor
Figure 4 shows the difference between an AC-DC supply with and without a power factor
correction.
Without power factor correction the input current flow occurs only in short spikes at the
minimum and maximum input voltages. This leads to high disturbances and high reactive
power in the power grid.
Output voltage
Input current
Input voltage
Figure 4
AC-DC supply without power factor correction
In figure 5 the AC-DC supply is equipped with a power factor correction and as a result the
current is shaped like the input voltage.
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Application Note AN186
40W LED Street and Indoor lighting demonstrator board
Output voltage
Input current
Input voltage
Figure 5
AC-DC supply with power factor correction
The operation principle allows for a very good power factor, which is mostly limited by the
input filter.
Figure 6 shows the actual input voltage and current waveforms of the 40W demo board, the
power factor and the harmonic distortion for 230V AC input voltage. Figure 7 shows the
actual power factor of the demo board as function of input voltage and output power.
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Application Note AN186
40W LED Street and Indoor lighting demonstrator board
Figure 6
Actual Input voltage, current waveform, powe factor, harmonic distortion
Figure 7
Power factor vs. Input voltage over output power of the demo board
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40W LED Street and Indoor lighting demonstrator board
7
BCR450 - Linear LED driver for high current LED driving
7.1
BCR450 facts, features, benefits
Figure 8
BCR450 in SC-74 package
The BCR450, with features like high output current accuracy of +/- 1.5%, overcurrent and
overvoltage protection and the ability to protect the LEDs from thermal overstress, is
designed for high current general lighting applications.
The 85mA current in standalone mode can be extended to up to 2.0A with an external
booster transistor. This circuit for high current applications is described in Application Note
AN105.
The combination of protection features and a price performance ratio that is benchmark in the
industry, the BCR450 offers a unique, yet cost effective way to drive high power LEDs.
Features of the BCR450:
„ High output current precision of +/- 1.5% at 25°C
„ Current range:
o Standalone mode: up to 85mA
o Booster circuit: 85mA – 2000mA
„ Maximum operating voltage: 27V
„ Overvoltage and overcurrent protection
„ Thermal shutdown
„ Low voltage overhead in boost mode
of only 0.5V (0.15V at sense resistor + 0.35V at booster transistor)
„ Direct PWM possible due to logic level enable input
„ Small 6-pin SC74 package
Benefits of the BCR450:
„ Thermal shutdown protects the LEDs from permanent damage
„ Linear concept eliminates EMI problems
„ External power stage allows improved heat dissipation in comparison to monolithic
drivers
„ Higher count of LEDs possible in a string due to very low voltage overhead
„ Less space needed on PCB, as no coils and inductors are required and no
external digital transistor for PWM
„ Excellent price-performance ratio, due to separation of power stage from highercost IC technology
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Application Note AN186
40W LED Street and Indoor lighting demonstrator board
7.2
The BCR450 high current concept
To extend the current range of the BCR450 to current levels beyond 85mA, another
approach is needed, to reach the 350mA required current for the used OSRAM Golden
Dragon + series LEDs for such higher power applications, the LED driver is used as a
“controller” and an external “booster transistor” is employed to handle the higher
current and heat dissipation.
For the correct choice of the transistor, the power dissipation and maximum ratings of the
devices must be checked and verified for each individual circuit design. As a general
guideline, the BC817SU is recommended for ½ Watt LEDs with currents up to 150mA, the
BCX68-25 is recommended for 1W LEDs with current up to 350mA and the BDP947 for
higher power, mostly 3W LEDs with current levels above 350mA, up to 700mA.
In general, the upper limit on output current for this circuit is only limited by the maximum
power dissipation & junction temperature of the boost transistor. It is even possible to parallel
multiple boost transistors for extremely high current operation.
Figure 9
BCR450 in a high current circuit for LED driving
In this particular case, the BCX68-25 was chosen, as the LED current is commonly 350mA
for 1W LEDs.
In this approach, the LED driver IC and external boost transistor still operate in a closed-loop
system and therefore the LED current is still tightly controlled over temperature and power
supply voltage variations. The basic concept is simple: the LED driver takes its output current
and feeds it into the base terminal of the external NPN boost transistor, in this case the
BCX68-25.
The boost transistor then multiplies this base current by the DC current gain (hFE) of the
boost transistor, with a much higher output current at the collector. The collector current
supplies the 3 LEDs in series.
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Application Note AN186
40W LED Street and Indoor lighting demonstrator board
Since the required output current from the standard LED driver is reduced or divided by the
DC current gain of the boost transistor, most of the power dissipation burden is now placed
upon the boost transistor, instead of on the LED Driver IC. The advantages of the lowcurrent, stand-alone BCR450 LED Driver circuit – including the high current precision of +/1,5%, the thermal shutdown feature which protects the LEDs from damage and the
overcurrent and overvoltage protection- are preserved.
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40W LED Street and Indoor lighting demonstrator board
8
BCR450 LED strip application schematic
Figure 10
24V BCR450 LED strip schematic
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40W LED Street and Indoor lighting demonstrator board
Appendix - Application Note EVALLED-TDA4863G-40W
Single Stage High PF Flyback Converter for Offline LED Supply
To give a more detailed view on the switch-mode power supply part, hence the AC-DC
conversion of the demonstrator board, the following section focuses on this part. This part is
also available as a separate application note on www.infineon.com
Application Note AN186, 1.0
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EVALLED-TDA4863G-40W
Content
1
Content
The EVALLED-TDA4863G-40W is a demoboard to demonstrate the concept of a single stage PFC+Flyback
converter using the TDA4863G and the CC-CV control chip TLE4305G in a LED driving application.
2
Evaluation Board
Figure 2-1
3
•
•
•
•
•
•
•
EVALLED-TDA4863G-40W
List of Features
High Efficiency of ~90%
High Power Factor up tp 0.98 and low THD
Low System BOM, trough Single Stage Concept
+/- 2% Accuracy Constant-Current Constant-Voltage Regulation
Cycle-By-Cycle Peak Current Limitation
Low In-Rush Current
VCC Over and Under-Voltage Protection
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EVALLED-TDA4863G-40W
Technical Specification
4
Technical Specification
Table 4-1 provides a summary of the EVALLED-TDA4863G-40W performance specification.
Table 4-1
Performance Specification
Specification
Min
Typ
1)
Max
Unit
Input Voltage
180
230
270
AC V
Output Voltage
15
22
26
V
Output Current
-2%
+2%
mA
40
W
Output Power
Output Ripple
+-15%
A
1) for a maximum ouput power of 20W the input voltage range is univerasl (90 V - 270 V)
5
Operation
Module 1
as reference
Module 2 .. 7
VCC
90 ...
270 VAC
TDA4863
Optocoupler
TLE4305
BCR450
REFGND
EVALLED-TDA4863-40W
Figure 5-1
5.1
GND
PWMDimming
Basic Application Schematic
Basic Operation
The topology of the EVALLED-TDA4863G-40W is in principal a peak-current mode, quasi-resonant flyback
converter. The current on the primary side is sensed via the sense resistor (R11). If this current reaches the
thershold (Ipk), the main switch (MOSFET Q1) is turned off. Zero current detection is done via the auxilliary
winding of the transformer. If zero current on the secondary winding of the transformer is detected the main switch
is turned on. Figure 5-2 shows the switching waveforms. The blue curve is the voltage on the sense resistor and
red curve the source-drain voltage at the main switch. This auxilliray winding is also used to supply the controller.
For detailed information on the dimesoning of the transformer, sense resistor and snubber circuit see also [3] .
To achieve a high power factor the peak current (Ipk) is modulated in a way to follow the rectified mains input
voltage. The input voltage is sensed via a resistive devider (R2,R2A, R3) and this signal is multiplied with the
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EVALLED-TDA4863G-40W
Setup and Results
feedback signal via the multiplier in the TDA4863G ([1]). This modulation of the peak current modulates the input
current to follow the input voltage and allows for a very good power factor. Please see Chapter 6.6 for
measurement result of the power factor and harmonic distortion.
Figure 5-2
Typical switching waveforms at 230 Vac mains voltage: Input Current (green), Output
Voltage
5.2
Output Control
The EVALLED-TDA4863G-40W allows for constant-current output control. For this control the TLE4305G is used
on the secondary side to measure the output current and feedback the control signal via the optocoupler. The
current is measured via the sense resistor (R19,R20) on the secondary site. To minimize the losses in the sense
resistor, the TLE4305G allows for a very low sense voltage of 0.2 V. Additionally the TLE4305G measures the
output voltage and switches to a constant-voltage regulation in case the output voltage exceeds the limit set by
the resistive divider (R17,R18). The time constants for the cc and cv regulation loop can be set independently with
the capacitors (C14,C15) and the resistors (R21,R22).
It is necessary that the current regulation time constant is lower than the mains AC frequency. On the other side
the voltage regulation must be fast, to avoid an overshoot at startup.
The current regulation is set for 350mA. This is true for a load connected between VCC and REFGND. Additional
LED strips can be connected between VCC and GND. These additional loads are not seen by the current
regulator.
6
Setup and Results
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EVALLED-TDA4863G-40W
Setup and Results
6.1
Input / Output Connector description
6.1.1
J1 - Vin
Input connector for AC supply. Please see Table 4-1for the maximum input voltage.
6.1.2
VCC
VCC is the positive output connector.
6.1.3
GND
GND is the negative output connector. Connect all load to this connector which should not be current regulated.
6.1.4
REFGND
REFGND is the negative output connector. The load which is connected between VCC and REFGND is monitored
and controlled to allow constan current.
6.2
Setup
For operation of the board connect the connector J1 to an AC voltage (see Table 4-1 for input voltage range).
Please be aware that high voltages of up to 800 V will be accessable on the board.
6.3
Power Up
The EVALLED-TDA4863G-40W utilizes a startup resistor (see R4, R4A in Figure 8-1) for the first system startup
(see Figure 6-1). As soon as the VCC voltage at the TDA4863G reaches the threshold it starts operating. The
start-up time is ~2 seconds. To reduce the start-up time a smaller startup resistor can be choosen. Be aware, that
this will have a negative impact on the efficiency.
Figure 6-1
Startup: Mains Input Voltage (red), VCC at controller (blue), Output Current (green), and
Output Voltage (yellow)
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EVALLED-TDA4863G-40W
Setup and Results
As already noted in Chapter 5.2 there two different time constants for the current regulation and the voltage
regulation. This can be seen in Figure 6-2. During startup the output voltage rises till it is limited by the constant
voltage regulation of the TLE4305G with a small time constant. After ~100ms the constant current regulation which
has a much higher time constant takes over and the output current is regulated.
Figure 6-2
6.4
Startup: Output Current (green), and Output Voltage (yellow)
Output Ripple
In this topology the mains AC frequency is filtered on the secondary side of the flyback converter. This allows for
a design with no high voltage electrolytic capacitors. The 100Hz/120Hz ripple of the output current is a function of
the output power and the output capacitor (C11A, C11B). For 40W output power the ripple is +-15%
Figure 6-3
Typical Waveforms: Iput Voltage (red), Output Current (green) and Output Voltage (yellow)
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EVALLED-TDA4863G-40W
Setup and Results
6.5
Efficiency
The principle of a quasi-resonant flyback converter allows for a good efficiency of ~90%. Figure 6.5 shows the
efficiency as function of input voltage for different output power levels.
Efficiency vs Input Voltage
95
Efficiency [%]
90
85
80
40W
20W
75
70
65
60
90
140
190
240
Input Voltage [Vac]
Figure 6-4
6.6
Efficiency over input voltage
Power Factor Correction
As discussed in Chapter 5.1 the operation principle allows for a very good power factor, which is mostly limited
by the input filter. Figure 6-5 and Figure 6-6 show the input voltage and current waveforms, the power factor and
the harmonic distorsion for 110 V and 230 V AC input voltage respectively. Figure 6-7 shows the power factor as
function of input voltage and output power.
Figure 6-5
Power Factor and THD at 110 Vac input voltage and 25W output power
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EVALLED-TDA4863G-40W
Setup and Results
Figure 6-6
Power Factor and THD at 230 Vac input voltage and 25W output power
Power Factor vs Input Voltage
1
0.95
Power Factor
0.9
0.85
40W
20W
0.8
0.75
0.7
0.65
0.6
90
140
190
240
Input Voltage [Vac]
Figure 6-7
Power Factor as function of the input voltage
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EVALLED-TDA4863G-40W
Setup and Results
6.7
EMI
The soft switching and inherent jittering of the topology allow for an EMI spectrum compliant to the norm with an
low BOM input filter design.
120
110
EN 55015 QP
100
20WLEDXC
40WLEDXC
90
80
dBµV
70
60
50
40
30
20
10
0
0.001
0.01
0.1
1
10
100
f / MHz
Figure 6-8
EMI Spectrum: C1 and C17 440nF, L1 2x47mH
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EVALLED-TDA4863G-40W
Board Layout
7
Board Layout
Figure 7-1
EVALLED-TDA4863G-40W Top Layer Routing
Figure 7-2
EVALLED-TDA4863G-40W Bottom Layer Routing
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EVALLED-TDA4863G-40W
Board Layout
Figure 7-3
EVALLED-TDA4863G-40W Composite Layer View
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Revision 1.0, 2009-12-15
90V..270V
Con 2
J1
2
1
F2A
2 x 47mH, 1.3A
EMV- Filter
R1
C1
S14K300 330n
305ac
L1
C17
330n
305ac
~
+
-
~
V-
C2
na
R3
10K
R2
499K
R2A
499K
C3
47u
35V
C4
220n
35V
2
1
1
2
D5
Diode Zehner
18V
R4A
402K
7
R9
10K
Vcc
8
GTDRV
Vsense
2
VAOut
1
1
2
6
GND
MULTIN
C5
1n
16V
3
5
DETIn
Isense
C6
1n
16V
4
IC1
TDA4863
33R
1 R7
C16
100p
16V
R5
1W
240K
Q1
900V
10K
1 R10
2
2
1000V
D2
C8
2n2
400V
R11
0R82
22K
1 R6
2
R13
3K3
R12
3K3
33
2
C7
3n3
16V
10n
400V
C10
SFH6186-2
IC3
1 R8
na
NA
IC2
NA
C12
1 R16
NA
1 R14
R15
NA
BAS21-03W
D3
TL431CLP
R4
402K
1
2
F1
BR1
GBU8J
1
2
1
2
1
2
na
2
E30
C13
2
7
5
3
2
T1
R18
3K9
R17
36K
12
14
4
3
2
1
R19
1R2
1
R20
1R2
GND
CCO
VCO
CRE
C11A
2200u
50V
TLE4305
TLE4305
CSE
OUT
VSE
S
IC4
MBRD660CT
D4
1
2
1
1
2
1
2
15
1
Application Note
Overview, V00D0
2
Figure 8-1
2
5
6
7
8
C11B
2200u
50V
C14
2u
16V
R21
0R0
C15
10n
16V
R22
0R0
VCC
GND
REFGND
CON 1X1
GND
CON 1X1
REFGND
CON 1X1
VCC
CON 1X1
VCC
Schematic
1
8.1
2
Schematic and BOM
1
2
8
1
2
V+
EVALLED-TDA4863G-40W
Schematic and BOM
EVALLED-TDA4863G-40W Schematic
Revision 1.0, 2009-12-15
TDA4863
EVALLED-TDA4863G-40W
Schematic and BOM
8.2
Bill of Materials
Designator
Value
L1
Value
2x47mH, 1.3A
305ac
Q1
R1
IPD90R1K2C3
S14K300
47u
220n
35V
35V
R2
R2A
499K
499K
C5
C6
1n
1n
16V
16V
R3
R4
10K
402K
C7
3n3
16V
R4A
402K
C8
C10
2n2
10n
400V
400V
R5
R6
240K
22K
C11A
C11B
2200u
2200u
50V
50V
R7
R8
33R
33
C12
C13
na
na
R9
R10
10K
10K
C14
2u
16V
R11
0R82
C15
C16
10n
100p
16V
16V
R12
R13
3K3
3K3
C17
D2
330n
1000V
305ac
R14
R15
NA
NA
D3
D4
BAS21-03W
6A
60V
R16
R17
NA
36K
18V
BR1
GBU8J
C1
C2
330n
na
C3
C4
D5
Rated Voltage
Designator
R18
3K9
F1
IC1
F2A
TDA4863
R19
R20
1R2
1R2
IC2
IC3
TL431CLP
SFH6186-2
R21
R22
0R0
0R0
IC4
TLE4305
T1
WE 750845240
Figure 8-2
Rated Voltage
EVALLED-TDA4863G-40W Bill Of Materials
Application Note
Overview, V00D0
16
Revision 1.0, 2009-12-15
EVALLED-TDA4863G-40W
Schematic and BOM
8.3
Figure 8-3
Transformer
EVALLED-TDA4863G-40W Trafo Design
Application Note
Overview, V00D0
17
Revision 1.0, 2009-12-15
EVALLED-TDA4863G-40W
Schematic and BOMReferences
References
[1]
TDA4863 datasheet at www.infineon.com
[2]
TLE4205G datasheet at www.infineon.com
[3]
Quasi Resonant Flyback Application Note at www.infineon.com
[4]
Quasi Resonant Flyback Design Tips at www.infineon.com
Application Note
Overview, V00D0
18
Revision 1.0, 2009-12-15
w w w . i n f i n e o n . c o m
Published by Infineon Technologies AG
AN186
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