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 failure of that life-support device or system or to affect the safety or effectiveness of that device or system. Life 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) Application Note AN186, 1.0 3 / 17 18.12.2009 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 Application Note AN186, 1.0 4 / 17 18.12.2009 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 5 / 17 18.12.2009 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 Application Note AN186, 1.0 6 / 17 18.12.2009 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. Application Note AN186, 1.0 7 / 17 18.12.2009 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%. Application Note AN186, 1.0 8 / 17 18.12.2009 Application Note AN186 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. Application Note AN186, 1.0 9 / 17 18.12.2009 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. Application Note AN186, 1.0 10 / 17 18.12.2009 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 Application Note AN186, 1.0 11 / 17 18.12.2009 Application Note AN186 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 Application Note AN186, 1.0 12 / 17 18.12.2009 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. Application Note AN186, 1.0 13 / 17 18.12.2009 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. Application Note AN186, 1.0 14 / 17 18.12.2009 Application Note AN186 40W LED Street and Indoor lighting demonstrator board 8 BCR450 LED strip application schematic Figure 10 24V BCR450 LED strip schematic Application Note AN186, 1.0 15 / 17 18.12.2009 Application Note AN186 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 16 / 17 18.12.2009 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 Application Note Overview, V00D0 5 Revision 1.0, 2009-12-15 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 Application Note Overview, V00D0 6 Revision 1.0, 2009-12-15 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 Application Note Overview, V00D0 7 Revision 1.0, 2009-12-15 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) Application Note Overview, V00D0 8 Revision 1.0, 2009-12-15 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) Application Note Overview, V00D0 9 Revision 1.0, 2009-12-15 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 Application Note Overview, V00D0 10 Revision 1.0, 2009-12-15 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 Application Note Overview, V00D0 11 Revision 1.0, 2009-12-15 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 Application Note Overview, V00D0 12 Revision 1.0, 2009-12-15 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 Application Note Overview, V00D0 13 Revision 1.0, 2009-12-15 EVALLED-TDA4863G-40W Board Layout Figure 7-3 EVALLED-TDA4863G-40W Composite Layer View Application Note Overview, V00D0 14 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