12V 12W SMPS evaluation board with ICE3RBR4765JZ

Transcription

1 CoolSET F3R Family ICE3RBR4765JZ 12V 12W SMPS evaluation board with ICE3RBR4765JZ Application Note AN-EVAL-3RBR4765JZ V1.1, Power Management & Multimarket

2 Edition Published by Infineon Technologies AG, Munich, Germany Infineon Technologies AG All Rights Reserved. LEGAL DISCLAIMER THE INFORMATION GIVEN IN THIS APPLICATION NOTE IS GIVEN AS A HINT FOR THE IMPLEMENTATION OF THE INFINEON TECHNOLOGIES COMPONENT ONLY AND SHALL NOT BE REGARDED AS ANY DESCRIPTION OR WARRANTY OF A CERTAIN FUNCTIONALITY, CONDITION OR QUALITY OF THE INFINEON TECHNOLOGIES COMPONENT. THE RECIPIENT OF THIS APPLICATION NOTE MUST VERIFY ANY FUNCTION DESCRIBED HEREIN IN THE REAL APPLICATION. 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) WITH RESPECT TO ANY AND ALL INFORMATION GIVEN IN THIS APPLICATION NOTE. Information For further information on technology, delivery terms and conditions and prices, please contact the nearest Infineon Technologies Office ( 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.

3 Trademarks of Infineon Technologies AG AURIX, C166, CanPAK, CIPOS, CIPURSE, EconoPACK, CoolMOS, CoolSET, CORECONTROL, CROSSAVE, DAVE, DI-POL, EasyPIM, EconoBRIDGE, EconoDUAL, EconoPIM, EconoPACK, EiceDRIVER, eupec, FCOS, HITFET, HybridPACK, I²RF, ISOFACE, IsoPACK, MIPAQ, ModSTACK, my-d, NovalithIC, OptiMOS, ORIGA, POWERCODE ; PRIMARION, PrimePACK, PrimeSTACK, PRO-SIL, PROFET, RASIC, ReverSave, SatRIC, SIEGET, SINDRION, SIPMOS, SmartLEWIS, SOLID FLASH, TEMPFET, thinq!, TRENCHSTOP, TriCore. Other Trademarks Advance Design System (ADS) of Agilent Technologies, AMBA, ARM, MULTI-ICE, KEIL, PRIMECELL, REALVIEW, THUMB, µvision of ARM Limited, UK. AUTOSAR is licensed by AUTOSAR development partnership. Bluetooth of Bluetooth SIG Inc. CAT-iq of DECT Forum. COLOSSUS, FirstGPS of Trimble Navigation Ltd. EMV of EMVCo, LLC (Visa Holdings Inc.). EPCOS of Epcos AG. FLEXGO of Microsoft Corporation. FlexRay is licensed by FlexRay Consortium. HYPERTERMINAL of Hilgraeve Incorporated. IEC of Commission Electrotechnique Internationale. IrDA of Infrared Data Association Corporation. ISO of INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. MATLAB of MathWorks, Inc. MAXIM of Maxim Integrated Products, Inc. MICROTEC, NUCLEUS of Mentor Graphics Corporation. MIPI of MIPI Alliance, Inc. MIPS of MIPS Technologies, Inc., USA. murata of MURATA MANUFACTURING CO., MICROWAVE OFFICE (MWO) of Applied Wave Research Inc., OmniVision of OmniVision Technologies, Inc. Openwave Openwave Systems Inc. RED HAT Red Hat, Inc. RFMD RF Micro Devices, Inc. SIRIUS of Sirius Satellite Radio Inc. SOLARIS of Sun Microsystems, Inc. SPANSION of Spansion LLC Ltd. Symbian of Symbian Software Limited. TAIYO YUDEN of Taiyo Yuden Co. TEAKLITE of CEVA, Inc. TEKTRONIX of Tektronix Inc. TOKO of TOKO KABUSHIKI KAISHA TA. UNIX of X/Open Company Limited. VERILOG, PALLADIUM of Cadence Design Systems, Inc. VLYNQ of Texas Instruments Incorporated. VXWORKS, WIND RIVER of WIND RIVER SYSTEMS, INC. ZETEX of Diodes Zetex Limited. Last Trademarks Update Application Note AN-EVAL-3RBR4765JZ 3 V1.1,

4 Revision History Major changes since previous revision Date Version Changed By Change Description 15 Jul Kyaw Zin Min update format, remove appendix We Listen to Your Comments Is there any information in this document that you feel is wrong, unclear or missing? Your feedback will help us to continuously improve the quality of our documentation. Please send your proposal (including a reference to this document title/number) to: ctdd@infineon.com Application Note AN-EVAL-3RBR4765JZ 4 V1.1,

5 Table of Contents Revision History... 4 Table of Contents Abstract Evaluation board List of features Technical specifications Circuit description Introduction Line input Start up Operation mode Soft start RCD clamper circuit Peak current control of primary current Output stage Feedback and regulation Blanking window for load jump Active burst mode Jitter mode Protection modes Circuit diagram PCB layout Top side Bottom side Component list Transformer construction Test results Efficiency Input standby power Line regulation Load regulation Maximum input power Electrostatic discharge/esd test (EN ) Surge/Lightning strike test (EN ) Conducted emissions (EN55022 class-b) Waveforms and scope plots Start up at low and high AC line input voltage and maximum load Soft start at low and high AC line input voltage and maximum load Frequency jittering Drain voltage and maximum load Load transient response (Dynamic load from 10% to 100%) Output ripple voltage at maximum load Application Note AN-EVAL-3RBR4765JZ 5 V1.1,

6 11.7 Output ripple voltage during burst mode at 1 W load Entering active burst mode Vcc overvoltage protection Over load protection (built-in + extended blanking time) Open loop protection V CC under voltage/short optocoupler protection Auto restart enable References Application Note AN-EVAL-3RBR4765JZ 6 V1.1,

7 Abstract 1 Abstract This document is an engineering report of a universal input 12V 12W off-line flyback converter power supply utilizing IFX F3R CoolSET ICE3RBR4765JZ. The application demo board is operated in Discontinuous Conduction Mode (DCM) and is running at 65 khz switching frequency. It has a one output voltage with secondary side control regulation. It is especially suitable for small power supply such as DVD player, set-top box, game console, charger and auxiliary power of high power system, etc. The ICE3RBR4765JZ is the latest version of the CoolSET. Besides having the basic features of the F3R CoolSET such as Active Burst Mode, propagation delay compensation, soft gate drive, auto restart protection for serious fault (Vcc over voltage protection, Vcc under voltage protection, over temperature, over-load, open loop and short opto-coupler), it also has the BiCMOS technology design, built-in soft start time, built-in and extendable blanking time, frequency jitter feature with built-in jitter period and external auto-restart enable, etc. The particular features needs to be stressed are the best in class low standby power and the good EMI performance. 2 Evaluation board Figure 1 EVAL3RBR4765JZ This document contains the list of features, the power supply specification, schematic, bill of material and the transformer construction documentation. Typical operating characteristics such as performance curve and scope waveforms are showed at the rear of the report. Application Note AN-EVAL-3RBR4765JZ 7 V1.1,

8 List of features 3 List of features 650V avalanche rugged CoolMOS with built-in Startup Cell Active Burst Mode for lowest Standby Power Fast load jump response in Active Burst Mode 65 khz internally fixed switching frequency Auto Restart Protection Mode for Overload, Open Loop, Vcc Undervoltage, Overtemperature & Vcc Overvoltage Built-in Soft Start Built-in blanking window with extendable blanking time for short duration high current External auto-restart enable pin Max Duty Cycle 75% Overall tolerance of Current Limiting < ±5% Internal PWM Leading Edge Blanking BiCMOS technology provides wide VCC range Built-in Frequency jitter feature and soft driving for low EMI 4 Technical specifications Input voltage 85VAC~265VAC Input frequency 60Hz Input Standby Power < 50mW at no load Output voltage 12V Output current 1A Output power 12W Active mode average efficiency(25%,50%,75% & 100%load) >84% Output ripple voltage < 50mVp-p Application Note AN-EVAL-3RBR4765JZ 8 V1.1,

9 Circuit description 5 Circuit description 5.1 Introduction The EVAL3RBR4765JZ demo board is a low cost off line flyback switch mode power supply ( SMPS ) using the ICE3RBR4765JZ integrated power IC from the CoolSET -F3R family. The circuit, shown in Figure 2, details a 12V, 12W power supply that operates from an AC line input voltage range of 85Vac to 265Vac, suitable for applications in open frame supply or enclosed adapter. 5.2 Line input The AC line input side comprises the input fuse F1 as over-current protection. The choke L11, X-capacitor C11 and Y-capacitor C12 act as EMI suppressors. Optional surge absorber device SA1, SA2 and varistor VAR can absorb high voltage stress during lightning surge test. A rectified DC voltage (120V ~ 374V) is obtained through the bridge rectifier BR1 and the input bulk capacitor C Start up Since there is a built-in startup cell in the ICE3RBR4765JZ, there is no need for external start up resistors. The startup cell is connecting the drain pin of the IC. Once the voltage is built up at the Drain pin of the ICE3RBR4765JZ, the startup cell will charge up the Vcc capacitor C16 and C17. When the Vcc voltage exceeds the UVLO at 18V, the IC starts up. Then the Vcc voltage is bootstrapped by the auxiliary winding to sustain the operation. 5.4 Operation mode During operation, the Vcc pin is supplied via a separate transformer winding with associated rectification D12 and buffering C16, C17. Resistor R12 is used for current limiting. In order not to exceed the maximum voltage at Vcc pin, an external zener diode ZD11 and resistor R13 can be added. 5.5 Soft start The Soft-Start is a built-in function and is set at 20ms. 5.6 RCD clamper circuit While turns off the CoolMOS, the clamper circuit R11, C15 and D11 absorbs the current caused by transformer leakage inductance once the voltage exceeds clamp capacitor voltage. Finally drain-source voltage of CoolMOS is lower than maximum break down voltage of CoolMOS. 5.7 Peak current control of primary current The CoolMOS drain source current is sensed via external shunt resistors R14 and R15 which determine the tolerance of the current limit control. Since ICE3RBR4765JZ is a current mode controller, it would have a cycleby-cycle primary current and feedback voltage control and can make sure the maximum power of the converter is controlled in every switching cycle. Besides, the patented propagation delay compensation is implemented to ensure the maximum input power can be controlled in an even tighter manner throughout the wide range input voltage. The demo board shows approximately +/-0.5% (refer to Figure 12). 5.8 Output stage On the secondary side the power is coupled out by a schottky diode D21. The capacitor C22 provides energy buffering following with the LC filter L21 and C24 to reduce the output voltage ripple considerably. Storage capacitor C22 is selected to have an internal resistance as small as possible (ESR) to minimize the output voltage ripple. Application Note AN-EVAL-3RBR4765JZ 9 V1.1,

10 5.9 Feedback and regulation 12V 12W SMPS evaluation board with ICE3RBR4765JZ Circuit description The output voltage is controlled using a TL431 (IC21). This device incorporates the voltage reference as well as the error amplifier and a driver stage. Compensation network C25, C26, R24, R25, R26 and R27 constitutes the external circuitry of the error amplifier of IC21. This circuitry allows the feedback to be precisely matched to dynamically varying load conditions and provides stable control. The maximum current through the optocoupler diode and the voltage reference is set by using resistors R22 and R23. Optocoupler IC12 is used for floating transmission of the control signal to the Feedback input via capacitor C18 of the ICE3RBR4765JZ control device. The optocoupler used meets DIN VDE 884 requirements for a wider creepage distance Blanking window for load jump In case of Load Jumps the Controller provides a Blanking Window before activating the Over Load Protection and entering the Auto Restart Mode. The blanking time is built-in at 20ms. If a longer blanking time is required, a capacitor, C19 can be added to BA pin to extend it. The extended time can be achieved by an internal 13µA constant current at BA pin to charge C19 ( C BK =47nF) from 0.9V to 4.0V. Thus the overall blanking time is the addition of 20ms and the extended time. The voltage at Feedback pin can rise above 4.3V without switching off due to over load protection within this blanking time frame. During the operation the transferred power is limited to the maximum peak current defined by the value of the current sense resistor, R14 and R15. ( )* CBK Tblanking Basic Extended 20ms 20ms * CBK 31. 2ms IBK 5.11 Active burst mode At light load condition, the SMPS enters into Active Burst Mode. At this start, the controller is always active and thus the V CC must always be kept above the switch off threshold V CCoff 10.5V. During active burst mode, the efficiency increases significantly and at the same time it supports low ripple on V OUT and fast response on load jump. When the voltage level at FB falls below 1.35V, the internal blanking timer starts to count. When it reaches the built-in 20ms blanking time, it will enter Active Burst Mode. The Blanking Window is generated to avoid sudden entering of Burst Mode due to load jump. During Active Burst Mode the current sense voltage limit is reduced from 1.03V to 0.34V so as to reduce the conduction losses and audible noise. All the internal circuits are switched off except the reference and bias voltages to reduce the total V CC current consumption to below 450µA. At burst mode, the FB voltage is changing like a saw tooth between 3 and 3.5V. To leave Burst Mode, FB voltage must exceed 4V. It will reset the Active Burst Mode and turn the SMPS into Normal Operating Mode. Maximum current can then be provided to stabilize V OUT Jitter mode The ICE3RBR4765JZ has frequency jittering feature to reduce the EMI noise. The jitter frequency is internally set at 65 khz (+/- 2.6 khz) and the jitter period is set at 4ms Protection modes Protection is one of the major factors to determine whether the system is safe and robust. Therefore sufficient protection is necessary. ICE3RBR4765JZ provides all the necessary protections to ensure the system is operating safely. The protections include Vcc overvoltage, overtemperature, overload, open loop, Vcc undervoltage, short optocoupler, etc. When those faults are found, the system will go into auto restart which means the system will stop for a short period of time and restart again. If the fault persists, the system will stop again. It is then until the fault is removed, the system resumes to normal operation. A list of protections and the failure conditions are showed in the below table. Application Note AN-EVAL-3RBR4765JZ 10 V1.1,

11 Circuit description Protection function Failure condition Protection Mode Vcc Overvoltage 1. Vcc > 20.5V & FB > 4.0V & during soft start period 2. Vcc > 25.5V Auto Restart Overtemperature (controller junction) Overload / Open loop Vcc Undervoltage / Short Optocoupler T J > 130 C V FB > 4.0V and V BA > 4.0V (Blanking time counted from charging V BA from 0.9V to 4.0V ) Vcc < 10.5V Auto Restart Auto Restart Auto Restart Auto-restart enable V BA < 0.33V Auto Restart Application Note AN-EVAL-3RBR4765JZ 11 V1.1,

12 Circuit diagram 6 Circuit diagram Figure 2 12W 12V ICE3RBR4765JZ power supply schematic Application Note AN-EVAL-3RBR4765JZ 12 V1.1,

13 PCB layout N.B. : In order to get the optimized performance of the CoolSET, the grounding of the PCB layout must be connected very carefully. From the circuit diagram above, it indicates that the grounding for the CoolSET can be split into several groups; signal ground, Vcc ground, Current sense resistor ground and EMI return ground. All the split grounds should be connected to the bulk capacitor ground separately. Signal ground includes all small signal grounds connecting to the CoolSET GND pin such as filter capacitor ground, C17, C18, C19 and opto-coupler ground. Vcc ground includes the Vcc capacitor ground, C16 and the auxiliary winding ground, pin 2 of the power transformer. Current Sense resistor ground includes current sense resistor R14 and R15. EMI return ground includes Y capacitor, C12. 7 PCB layout 7.1 Top side Figure 3 Top side component legend 7.2 Bottom side Figure 4 Bottom side copper and component legend Application Note AN-EVAL-3RBR4765JZ 13 V1.1,

14 8 Component list No. Designator 12V 12W SMPS evaluation board with ICE3RBR4765JZ Component list Component Description Footprint Part Number Manufacturer Quantity 1 +12V 12V Test Point Connector BR1 600V/1A 1V S1VBA60 SHINDENGEN 1 3 C11 100nF/305V MKT5/18/15 B329221C3104+*** EPCOS 1 4 C12 2.2nF 250V MKT2/13/10 DE1E3KX222MA4BL01 MURATA 1 5 C13 33uF/450V RB16X25 450BXC33MEFC16X25 RUBYCON 1 6 C15 2.2nF/630V 1206 GRM31A7U2J222JW31D MURATA 1 7 C16 22uF/50V RB5.5 50PX22MEFC5X11 RUBYCON 1 8 C17 100nF/63V C18 1nF/63V C19 47nF/63V C uF 16V RB10.5 B41889A4108M EPCOS 1 12 C24 330uF 25V RB8 25ZL330MEFC8X16 RUBYCON 1 13 C25 220nF 63V C26 1nF 63V Com Com Test Point Connector D11 600V/0.8A DIODE0.4 D1NK60 SHINDENGEN 1 17 D12 150V/0.5A 1206D 1 18 D21 100V/20A TO-220/ F1 250V/1A MKT4.3/8.4/ L21 Ferrite bead Axial 0.4_V_FB Fair-Rite( ) 1 21 HS1 TO220 heat sink HS TO B00000G 1 22 IC11 ICE3RBR4765JZ DIP7 ICE3RBR4765JZ INFINEON 1 23 IC12 SFH617 A3 DIP IC21 TL431 TO92-TL L N Connector Connector 1 26 L11 39mH/0.6A EMI_C_U21 B82731M2601A030 EPCOS 1 27 R11 150k/1W R12 18R R14,R15 2R7/0.25W/1% R22 820R R23 1.2k R24 68k R25 75k AXIAL R26 20k R27 1k TR1 882µH(66:11:16) TR_EF20_H , Rev00 Wurth Electronics Midcom 1 Application Note AN-EVAL-3RBR4765JZ 14 V1.1,

15 9 Transformer construction 12V 12W SMPS evaluation board with ICE3RBR4765JZ Core and material: EE20/10/6(EF20), TP4A (TDG) Bobbin: (10-Pin, THT, Horizontal version) Primary Inductance, Lp=882μH (±10%), measured between pin 4 and pin 5 Manufacturer and part number: Wurth Electronics Midcom ( , Rev00) Transformer specifications: Transformer construction Figure 5 Transformer structure Application Note AN-EVAL-3RBR4765JZ 15 V1.1,

16 Test results 10 Test results 10.1 Efficiency Figure 6 Efficiency Vs. AC line input voltage Figure 7 Efficiency Vs. output 115Vac and 230Vac Application Note AN-EVAL-3RBR4765JZ 16 V1.1,

17 Test results 10.2 Input standby power Figure 8 Input standby no load Vs. AC line input voltage ( measured by Yokogawa WT210 power meter - integration mode ) Figure 9 Input standby 0.5W, 1W & 2W Vs. AC line input voltage ( measured by Yokogawa WT210 power meter - integration mode ) Application Note AN-EVAL-3RBR4765JZ 17 V1.1,

18 Test results 10.3 Line regulation Figure 10 Line regulation full load vs. AC line input voltage 10.4 Load regulation Figure 11 Load regulation Vout vs. output power Application Note AN-EVAL-3RBR4765JZ 18 V1.1,

19 Test results 10.5 Maximum input power Figure 12 Maximum input power ( before overload protection ) vs. AC line input voltage 10.6 Electrostatic discharge/esd test (EN ) Pass (Special level (12kV) for contact discharge) 10.7 Surge/Lightning strike test (EN ) Pass (Installation class 3, 2kV for line to earth) Pass (Installation class 4, 4kV for line to earth with surge absorber device; SA1 & SA2 (SSA601M)) Application Note AN-EVAL-3RBR4765JZ 19 V1.1,

20 10.8 Conducted emissions (EN55022 class-b) 12V 12W SMPS evaluation board with ICE3RBR4765JZ Test results The conducted emissions was measured by Schaffner (SMR4503) and followed the test standard of EN55022 (CISPR 22) class B. The demo board was set up at maximum load (12W) with input voltage of 115Vac and 230Vac. Figure 13 Maximum load (12W) with 115 Vac (Line) Figure 14 Maximum load (12W) with 115 Vac (Neutral) Application Note AN-EVAL-3RBR4765JZ 20 V1.1,

21 Test results Figure 15 Maximum load (12W) with 230 Vac (Line) Figure 16 Maximum load (12W) with 230 Vac (Neutral) Pass conducted emissions EN55022 (CISPR 22) class B with > 10dB margin. Application Note AN-EVAL-3RBR4765JZ 21 V1.1,

22 11 Waveforms and scope plots All waveforms and scope plots were recorded with a LeCroy 6050 oscilloscope Waveforms and scope plots 11.1 Start up at low and high AC line input voltage and maximum load 502ms 502ms Channel 1; C1 : Drain voltage (V Drain ) Startup time = 502ms Figure 17 85Vac & max. load Channel 1; C1 : Drain voltage (V Drain ) Startup time = 502ms Figure Vac & max. load 11.2 Soft start at low and high AC line input voltage and maximum load 18ms 18ms Channel 1; C1 : Current sense voltage (V CS ) Soft Start time = 18ms Figure 19 Soft 85Vac & max. load Channel 1; C1 : Current sense voltage (V CS ) Soft Start time = 18ms Figure 20 Soft 265Vac & max. load Application Note AN-EVAL-3RBR4765JZ 22 V1.1,

23 Waveforms and scope plots 11.3 Frequency jittering 71kHz 71kHz 3.8ms 3.8ms 66kHz 66kHz Channel 1; C1 : Drain to source voltage (V DS ) Channel F2 : Frequency track of C1 Frequency jittering from 66 khz ~ 71kHz, Jitter period is 3.8ms Figure 21 Frequency 85Vac and max. load Channel 1; C1 : Drain to source voltage (V DS ) Channel F2 : Frequency track of C1 Frequency jittering from 66 khz ~ 71kHz, Jitter period is 3.8ms Figure 22 Frequency 265Vac and max. load 11.4 Drain voltage and maximum load Channel 1; C1 : Drain Voltage ( V D ) Channel 1; C1 : Drain Voltage ( V D ) Channel 2; C2 : Drain Current ( I D ) Channel 2; C2 : Drain Current ( I D ) Duty cycle = 43%, V DS_peak =234V Duty cycle = 10% V DS_peak =523V Figure 23 Vin = 85Vac and max. Figure 24 Vin = 265Vac and max. load load Application Note AN-EVAL-3RBR4765JZ 23 V1.1,

24 11.5 Load transient response (Dynamic load from 10% to 100%) Waveforms and scope plots Channel 1; C1 : Output ripple Voltage ( V o ) Channel 2; C2 : Output Current ( I o ) V ripple_pk_pk =129mV (Load change from10% to 100%,100Hz,0.4A/μS slew rate) Probe terminal end with decoupling capacitor of 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter Figure 25 Load transient 85Vac Channel 1; C1 : Output ripple Voltage ( V o ) Channel 2; C2 : Output Current ( I o ) V ripple_pk_pk =129mV (Load change from10% to 100%,100Hz,0.4A/μS slew rate) Probe terminal end with decoupling capacitor of 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter Figure 26 Load transient 265Vac 11.6 Output ripple voltage at maximum load Channel 1; C1 : Output ripple Voltage ( V o ) Channel 1; C1 : Output ripple Voltage ( V o ) V ripple_pk_pk =24mV Probe terminal end with decoupling capacitor of 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter Figure 27 AC output Vin=85Vac and max. load V ripple_pk_pk =25.6mV Probe terminal end with decoupling capacitor of 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter Figure 28 AC output Vin=265Vac and max. load Application Note AN-EVAL-3RBR4765JZ 24 V1.1,

25 11.7 Output ripple voltage during burst mode at 1 W load Waveforms and scope plots Channel 1; C1 : Output ripple Voltage ( V o ) Channel 1; C1 : Output ripple Voltage ( V o ) V ripple_pk_pk =44mV Probe terminal end with decoupling capacitor of 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter Figure 29 AC output 85Vac and 1W load V ripple_pk_pk = 50mV Probe terminal end with decoupling capacitor of 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter Figure 30 AC output 265Vac and 1W load 11.8 Entering active burst mode Channel 1; C1 : Current sense voltage (V CS ) Blanking time to enter burst mode : 18ms (load step down from 1A to A) Figure 31 Active burst 85Vac Channel 1; C1 : Current sense voltage (V CS ) Blanking time to enter burst mode : 18ms (load step down from 1A to A) Figure 32 Active burst Vin=265Vac Application Note AN-EVAL-3RBR4765JZ 25 V1.1,

26 11.9 Vcc overvoltage protection 12V 12W SMPS evaluation board with ICE3RBR4765JZ Waveforms and scope plots V CC OVP2 V CC OVP1 V CC OVP2 V CC OVP1 Channel 1; C1 : Current sense voltage (V CS ) VCC OVP2 first & follows VCC OVP1 (R25 disconnected during system operating at no load) Figure 33 Vcc overvoltage 85Vac Channel 1; C1 : Current sense voltage (V CS ) VCC OVP2 first & follows VCC OVP1 (R25 disconnected during system operating at no load) Figure 34 Vcc overvoltage 265Vac Over load protection (built-in + extended blanking time) Channel 1; C1 : Current sense voltage (V CS ) Over load protection with 28ms(18+10) blanking time (output load change from 1A to 1.5A) Figure 35 Over load protection with built-in+extended blanking 85Vac Channel 1; C1 : Current sense voltage (V CS ) Over load protection with 28ms(18+10) blanking time (output load change from 1A to 1.5A) Figure 36 Over load protection with built-in+extended blanking 265Vac Application Note AN-EVAL-3RBR4765JZ 26 V1.1,

27 Waveforms and scope plots Open loop protection Channel 1; C1 : Current sense voltage (V CS ) Open loop protection (R25 disconnected during system operation at max. load) over load protection Figure 37 Open loop 85Vac Channel 1; C1 : Current sense voltage (V CS ) Open loop protection (R25 disconnected during system operation at max. load) over load protection Figure 38 Open loop 265Vac V CC under voltage/short optocoupler protection Channel 1; C1 : Current sense voltage (V CS ) V CC under voltage/short optocoupler protection (short the transistor of optocoupler during system full load) Figure 39 V cc under voltage/short optocoupler 85Vac Channel 1; C1 : Current sense voltage (V CS ) V CC under voltage/short optocoupler protection (short the transistor of optocoupler during system full load) Figure 40 V cc under voltage/short optocoupler 265Vac Application Note AN-EVAL-3RBR4765JZ 27 V1.1,

28 References Auto restart enable Enter autorestart Exit autorestart Enter autorestart Exit autorestart Channel 1; C1 : Current sense voltage (V CS ) External autorestart enable (short BA pin to Gnd by 10Ω resistor & open) Figure 41 External protection 85Vac Channel 1; C1 : Current sense voltage (V CS ) External autorestart enable (short BA pin to Gnd by 10Ω resistor & open) Figure 42 External protection 265Vac 12 References [1] Infineon Technologies, Datasheet CoolSET -F3R ICE3RBR4765JZ Off-Line SMPS Current Mode Controller with Integrated 650V CoolMOS and Startup cell ( frequency jitter Mode ) in Dip-7 [2] Kyaw Zin Min, Kok Siu Kam Eric, Infineon Technologies, Application Note CoolSET -F3R (DIP-8, DIP-7 & DSO-16/12) new Jitter version Design Guide [3] Harald Zoellinger, Rainer Kling, Infineon Technologies, Application Note AN-SMPS-ICE2xXXX-1, CoolSET. ICE2xXXXX for Off-Line Switching Mode Power supply (SMPS ) Application Note AN-EVAL-3RBR4765JZ 28 V1.1,

29 w w w. i n f i n e o n. c o m Published by Infineon Technologies AG