Application Note, V1.0, Sep 2012 A N -E V A L 3B R 10 6 5J 25W 12V S MPS E val uati on Board with CoolSET® F3R ICE3BR1065J Power Management & Supply N e v e r s t o p t h i n k i n g . Published by Infineon Technologies AG 81726 Munich, Germany © 2012 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. 25W 12V Demo board using ICE3BR1065J Revision History: Previous Version: Page 2012-9 V1.0 none Subjects (major changes since last revision) 25W 12V SMPS Evaluation Board with CoolSET® F3R ICE3BR1065J: License to Infineon Technologies Asia Pacific Pte Ltd Kyaw Zin Min Kok Siu Kam Eric We Listen to Your Comments Any information within this document that you feel is wrong, unclear or missing at all? Your feedback will help us to continuously improve the quality of this document. Please send your proposal (including a reference to this document) to: [email protected] AN-PS0073 25W 12V Demo board using ICE3BR1065J Table of Contents Page 1 Abstract .................................................................................................................................... 5 2 Evaluation board ...................................................................................................................... 5 3 List of features ......................................................................................................................... 6 4 Technical specifications .......................................................................................................... 6 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.11 5.12 5.13 Circuit description.................................................................................................................... 7 Introduction ................................................................................................................................ 7 Line input ................................................................................................................................... 7 Start up ...................................................................................................................................... 7 Operation mode ......................................................................................................................... 7 Soft start .................................................................................................................................... 7 RCD clamper circuit ................................................................................................................... 7 Peak current control of primary current ....................................................................................... 7 Output stage .............................................................................................................................. 8 Feedback and regulation ............................................................................................................ 8 Blanking window for load jump ................................................................................................... 8 Active burst mode ...................................................................................................................... 8 Jitter mode ................................................................................................................................. 8 Protection modes ....................................................................................................................... 9 6 Circuit diagram ....................................................................................................................... 10 7 7.1 7.2 PCB layout.............................................................................................................................. 12 Top side ................................................................................................................................... 12 Bottom side .............................................................................................................................. 12 8 Component list ....................................................................................................................... 13 9 Transformer construction ...................................................................................................... 14 10 10.1 10.2 10.3 10.4 10.5 10.6 10.7 10.8 Test results............................................................................................................................. 15 Efficiency ................................................................................................................................. 15 Input standby power ................................................................................................................. 16 Line regulation ......................................................................................................................... 17 Load regulation ........................................................................................................................ 17 Maximum input power .............................................................................................................. 18 Electrostatic discharge/ESD test (EN6100-4-2)......................................................................... 18 Surge/Lightning strike test (EN61000-4-5) ................................................................................ 18 Conducted emissions (EN55022 class-B) ................................................................................. 19 11 11.1 11.2 11.3 11.4 11.5 11.6 11.7 11.8 11.9 11.10 11.11 11.12 11.13 Waveforms and scope plots .................................................................................................. 21 Start up at low and high AC line input voltage and maximum load ............................................. 21 Soft start at low and high AC line input voltage and maximum load ........................................... 21 Frequency jittering.................................................................................................................... 22 Drain voltage and current @ maximum load ............................................................................. 22 Load transient response (Dynamic load from 10% to 100%) ..................................................... 23 Output ripple voltage at maximum load ..................................................................................... 23 Output ripple voltage during burst mode at 1 W load ................................................................. 24 Entering active burst mode ....................................................................................................... 24 Vcc overvoltage protection ....................................................................................................... 25 Over load protection (built-in + extended blanking time) ............................................................ 25 Open loop protection ................................................................................................................ 26 VCC under voltage/Short optocoupler protection ........................................................................ 26 Auto restart enable ................................................................................................................... 27 12 12.1 Appendix ................................................................................................................................ 28 Slope compensation for CCM operation ................................................................................... 28 13 References ............................................................................................................................. 28 Application Note 4 2012-09-19 25W 12V Demo board using ICE3BR1065J 1 Abstract This document is an engineering report of a universal input 12V 25W off-line flyback converter power supply utilizing IFX F3R CoolSET® ICE3BR1065J. 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 ICE3BR1065J 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 optocoupler), 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 – EVAL3BR1065J 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 5 2012-09-19 25W 12V Demo board using ICE3BR1065J 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 +/- 1% Output current 2.09A Output power 25W Active mode average efficiency(25%,50%,75% & 100%load) >82% Output ripple voltage < 70mVp-p Application Note 6 2012-09-19 25W 12V Demo board using ICE3BR1065J 5 Circuit description 5.1 Introduction The EVAL3BR1065J demo board is a low cost off line flyback switch mode power supply ( SMPS ) using the ICE3BR1065J integrated power IC from the CoolSET® -F3R family. The circuit, shown in Figure 2, details a 12V, 25W 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 C13. 5.3 Start up Since there is a built-in startup cell in the ICE3BR1065J, 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 ICE3BR1065J, 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 ICE3BR1065J 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 +/-1.95% (refer to Figure 12). Application Note 7 2012-09-19 25W 12V Demo board using ICE3BR1065J 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 C23 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. 5.9 Feedback and regulation 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, R27 and R28 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 ICE3BR1065J control device. The optocoupler used meets DIN VDE 884 requirements for a wider creepage distance. 5.10 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 ( CBK =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. Tblanking Basic Extended 20ms 5.11 (4.0 0.9) * CBK 20ms 238461.5 * CBK 31.2ms IBK 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 VCC must always be kept above the switch off threshold VCCoff ≥ 10.5V. During active burst mode, the efficiency increases significantly and at the same time it supports low ripple on VOUT 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 VCC 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 VOUT. 5.12 Jitter mode The ICE3BR1065J 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. Application Note 8 2012-09-19 25W 12V Demo board using ICE3BR1065J 5.13 Protection modes Protection is one of the major factors to determine whether the system is safe and robust. Therefore sufficient protection is necessary. ICE3BR1065J 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. Protection function Failure condition Vcc Overvoltage 1. Vcc > 20.5V & FB > 4.0V & during soft start period 2. Vcc > 25.5V Auto Restart Overtemperature (controller junction) TJ > 130°C Auto Restart Overload / Open loop VFB > 4.0V and VBA > 4.0V (Blanking time counted from charging VBA from 0.9V to 4.0V ) Auto Restart Vcc Undervoltage / Short Optocoupler Vcc < 10.5V Auto Restart Auto-restart enable VBA < 0.33V Auto Restart Application Note Protection Mode 9 2012-09-19 25W 12V Demo board using ICE3BR1065J 6 Circuit diagram Figure 2 – 25W 12V ICE3BR1065J power supply schematic Application Note 10 2012-09-19 25W 12V Demo board using ICE3BR1065J 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. Application Note 11 2012-09-19 25W 12V Demo board using ICE3BR1065J 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 12 2012-09-19 25W 12V Demo board using ICE3BR1065J Component list 8 No. Designator Component Description 1 +12V 2 3 4 5 6 7 8 9 10 11 12 13 14 BR1 C11 C12 C13 C15 C16 C17 C18 C19 C22 C23 C25 C26 15 Com 16 17 18 19 D11 D12 D21 F1 32/0.2mm red wire (5cm) 600V/0.8A 100nF/305V 2.2nF 250V 68uF/400V 2.2nF/630V 22uF/50V 100nF/63V 1nF/63V 47nF/63V 1000uF 16V 330uF 25V 68nF 63V 1nF 63V 32/0.2mm black wire (8cm) 600V/0.8A 200V/0.5A 100V/30A 250V/1A 20 L21 Ferrite bead 21 22 HS1 Heat sink pad 23 24 25 26 27 28 29 30 31 32 33 34 35 IC11 IC12 IC21 L N L11 R11 R12 R14,R15 R22 R23 R24,R27 R26 R28 TO220 heat sink SIL-PAD 400,.007", TO220 ICE3BR1065J SFH617 A3 TL431 Connector 47mH/0.5A 33k/1W 18R 1R3/0.25W/1% 430R 1.2k 1k 20k 75k 36 TR1 417µH(66:11:14) Application Note Footprint Part Number Manufacturer Quantity Connector 1V MKT5/18/15 MKT2/13/10 RB18X31.5 1206 RB5.5 0603 MKT2/7/5 0603 RB10.5 RB8 0603 0603 1 S1VBA60 B329221C3104+*** DE1E3KX222MA4BL01 400BXC68MEFC18X25 GRM31A7U2J222JW31D 50PX22MEFC5X11 SHINDENGEN EPCOS MURATA RUBYCON MURATA RUBYCON B41889A4108M 25ZL330MEFC8X16 EPCOS RUBYCON Connector DIODE0.4 1206D TO-220/3 MKT4.3/8.4/5 Axial 0.4_V_FB HS TO220 1 1 1 1 1 1 1 1 1 1 1 1 1 1 D1NK60 GL34D V30100C SHINDENGEN 1 1 1 1 1 1 3223-07FR-43 1 DIP7 DIP4 TO92-TL431Connector EMI_C_U21 1218 0603 1206 0603 0603 0603 0603 AXIAL0.3 ICE3BR1065J INFINEON B82731M2501A030 EPCOS TR_EF20_H 750341498, Rev00 Wurth Electronics Midcom 13 1 1 1 1 1 1 1 2 1 1 2 1 1 1 2012-09-19 25W 12V Demo board using ICE3BR1065J Transformer construction 9 Core and material: EE20/10/6(EF20), TP4 (TDG) Bobbin: 10-Pin, THT, Horizontal version Primary Inductance, Lp=417μH (±10%), measured between pin 4 and pin 5 Manufacturer and part number: Wurth Electronics Midcom (750341498, Rev00) Transformer structure: Figure 5 – Transformer structure Wire size and electrical specifications: Start Stop No. of turns Wire size 5 7 8 3 6 6 33 11 11 1XAWG#32 2XAWG#29 2XAWG#29 1 3 2 4 1 33 14 1XAWG#32 1XAWG#32 1 Application Note Layer /2 Primary Secondary Secondary /2 Primary Auxiliary 14 2012-09-19 25W 12V Demo board using ICE3BR1065J 10 Test results 10.1 Efficiency Figure 6 – Efficiency Vs. AC line input voltage Figure 7 – Efficiency Vs. output power @ 115Vac and 230Vac Application Note 15 2012-09-19 25W 12V Demo board using ICE3BR1065J 10.2 Input standby power Figure 8 – Input standby power @ no load Vs. AC line input voltage ( measured by Yokogawa WT210 power meter - integration mode ) Figure 9 – Input standby power @ 0.5W, 1W, 2W & 3W Vs. AC line input voltage ( measured by Yokogawa WT210 power meter - integration mode ) Application Note 16 2012-09-19 25W 12V Demo board using ICE3BR1065J 10.3 Line regulation Figure 10 – Line regulation Vout @ full load vs. AC line input voltage 10.4 Load regulation Figure 11 – Load regulation Vout vs. output power Application Note 17 2012-09-19 25W 12V Demo board using ICE3BR1065J 10.5 Maximum input power Figure 12 – Maximum input power ( before overload protection ) vs. AC line input voltage 10.6 Electrostatic discharge/ESD test (EN6100-4-2) Pass (Special level (12kV) for contact discharge) 10.7 Surge/Lightning strike test (EN61000-4-5) Pass (Installation class 2, 1kV for line to earth) Pass (Installation class 4, 4kV for line to earth with surge absorber device; SA1 & SA2 (SSA601M)) Application Note 18 2012-09-19 25W 12V Demo board using ICE3BR1065J 10.8 Conducted emissions (EN55022 class-B) 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 (25W) with input voltage of 115Vac and 230Vac. Figure 13 – Maximum load (25W) with 115 Vac (Line) Figure 14 – Maximum load (25W) with 115 Vac (Neutral) Application Note 19 2012-09-19 25W 12V Demo board using ICE3BR1065J Figure 15 – Maximum load (25W) with 230 Vac (Line) Figure 16 – Maximum load (25W) with 230 Vac (Neutral) Pass conducted emissions EN55022 (CISPR 22) class B with > 9dB margin. Application Note 20 2012-09-19 25W 12V Demo board using ICE3BR1065J 11 Waveforms and scope plots All waveforms and scope plots were recorded with a LeCroy 6050 oscilloscope 11.1 Start up at low and high AC line input voltage and maximum load 518ms Channel Channel Channel Channel 1; C1 : Drain voltage (VDrain) 2; C2 : Supply voltage (VCC) 3; C3 : Feedback voltage (VFB) 4; C4 : BA voltage (VBA) 518ms Channel Channel Channel Channel 1; C1 : Drain voltage (VDrain) 2; C2 : Supply voltage (VCC) 3; C3 : Feedback voltage (VFB) 4; C4 : BA voltage (VBA) Startup time = 518ms Startup time = 518ms Figure 17 – Startup @ 85Vac & max. load Figure 18 – Startup @ 265Vac & max. load 11.2 Soft start at low and high AC line input voltage and maximum load 20ms 20ms Channel 1; C1 : Current sense voltage (VCS) Channel 1; C1 : Current sense voltage (VCS) Soft Star time = 20ms Soft Star time = 20ms Figure 19 – Soft Start @ 85Vac & max. load Figure 20– Soft Start @ 265Vac & max. load Application Note 21 2012-09-19 25W 12V Demo board using ICE3BR1065J 11.3 Frequency jittering 64kHz 64kHz 4ms 4ms 59kHz 59kHz Channel 1; C1 : Drain to source voltage (VDS) Channel 1; C1 : Drain to source voltage (VDS) Channel F2 : Frequency track of C1 Channel F2 : Frequency track of C1 Frequency jittering from 59 kHz ~ 64kHz, Jitter period is 4ms Frequency jittering from 59 kHz ~ 64kHz, Jitter period is 4ms Figure 21 – Frequency jittering @ 85Vac and max. load Figure 22 – Frequency jittering @ 265Vac and max. load 11.4 Drain voltage and current @ maximum load Channel 1; C1 : Drain Voltage ( VD ) Channel 2; C2 : Drain Current ( ID ) Duty cycle = 38%, VDS_peak=264V Figure 23 – Operation @ Vin = 85Vac and max. load Application Note Channel 1; C1 : Drain Voltage ( VD ) Channel 2; C2 : Drain Current ( ID ) Duty cycle = 10% VDS_peak=540V Figure 24 – Operation @ Vin = 265Vac and max. load 22 2012-09-19 25W 12V Demo board using ICE3BR1065J 11.5 Load transient response (Dynamic load from 10% to 100%) Channel 1; C1 : Output ripple Voltage ( Vo ) Channel 2; C2 : Output Current ( Io ) Vripple_pk_pk=254mV (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 response @ 85Vac 11.6 Channel 1; C1 : Output ripple Voltage ( Vo ) Channel 2; C2 : Output Current ( Io ) Vripple_pk_pk=254mV (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 response @ 265Vac Output ripple voltage at maximum load Channel 1; C1 : Output ripple Voltage ( Vo ) Channel 2; C2 : Output Current ( Io ) Vripple_pk_pk=59mV Probe terminal end with decoupling capacitor of 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter Figure 27 – AC output ripple @ Vin=85Vac and max. load Application Note Channel 1; C1 : Output ripple Voltage ( Vo ) Channel 2; C2 : Output Current ( Io ) Vripple_pk_pk=59mV Probe terminal end with decoupling capacitor of 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter Figure 28 – AC output ripple @ Vin=265Vac and max. load 23 2012-09-19 25W 12V Demo board using ICE3BR1065J 11.7 Output ripple voltage during burst mode at 1 W load Channel 1; C1 : Output ripple Voltage ( Vo ) Channel 2; C2 : Output Current ( Io ) Vripple_pk_pk=56mV Probe terminal end with decoupling capacitor 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter Channel 1; C1 : Output ripple Voltage ( Vo ) Channel 2; C2 : Output Current ( Io ) of Figure 29 – AC output ripple @ 85Vac and 1W load 11.8 Vripple_pk_pk = 62mV Probe terminal end with decoupling capacitor 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter of Figure 30 – AC output ripple @ 265Vac and 1W load Entering active burst mode Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BA voltage (VBA) Blanking time to enter burst mode : 20ms (load step down from 2.09A to 0.083A) Figure 31 – Active burst mode @ 85Vac Application Note Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BA voltage (VBA) Blanking time to enter burst mode : 20ms (load step down from 2.09A to 0.083A) Figure 32 – Active burst mode @ Vin=265Vac 24 2012-09-19 25W 12V Demo board using ICE3BR1065J 11.9 Vcc overvoltage protection VCC OVP2 VCC OVP1 Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BA voltage (VBA) VCC OVP2 first & follows VCC OVP1 (R28 disconnected during system operating with no load) Figure 33 – Vcc overvoltage protection @ 85Vac 11.10 VCC OVP2 VCC OVP1 Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BA voltage (VBA) VCC OVP2 first & follows VCC OVP1 (R28 disconnected during system operating with no load) Figure 34 – Vcc overvoltage protection @ 265Vac Over load protection (built-in + extended blanking time) Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BA voltage (VBA) Over load protection with 29ms(20+9) blanking time (output load change from 2.09A to 2.7A) Figure 35 – Over load protection with built-in+extended blanking time @ 85Vac Application Note Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BA voltage (VBA) Over load protection with 29ms(20+9) blanking time (output load change from 2.09A to 2.7A) Figure 36 – Over load protection with built-in+extended blanking time @ 265Vac 25 2012-09-19 25W 12V Demo board using ICE3BR1065J 11.11 Channel Channel Channel Channel Open loop protection 1; C1 : Current sense voltage (VCS) 2; C2 : Supply voltage (VCC) 3; C3 : Feedback voltage (VFB) 4; C4 : BA voltage (VBA) Channel Channel Channel Channel 1; C1 : Current sense voltage (VCS) 2; C2 : Supply voltage (VCC) 3; C3 : Feedback voltage (VFB) 4; C4 : BA voltage (VBA) Open loop protection (R28 disconnected during system operation at max. load) – over load protection Open loop protection (R28 disconnected during system operation at max. load) – over load protection Figure 37 – Open loop protection @ 85Vac Figure 38 – Open loop protection @ 265Vac 11.12 Channel Channel Channel Channel VCC under voltage/Short optocoupler protection 1; C1 : Current sense voltage (VCS) 2; C2 : Supply voltage (VCC) 3; C3 : Feedback voltage (VFB) 4; C4 : BA voltage (VBA) Channel Channel Channel Channel 1; C1 : Current sense voltage (VCS) 2; C2 : Supply voltage (VCC) 3; C3 : Feedback voltage (VFB) 4; C4 : BA voltage (VBA) VCC under voltage/short optocoupler protection (short the transistor of optocoupler during system operating @ full load) VCC under voltage/short optocoupler protection (short the transistor of optocoupler during system operating @ full load) Figure 39 – Vcc under voltage/short optocoupler protection @ 85Vac Figure 40 – Vcc under voltage/short optocoupler protection @ 265Vac Application Note 26 2012-09-19 25W 12V Demo board using ICE3BR1065J 11.13 Auto restart enable Enter autorestart Channel Channel Channel Channel Enter autorestart Exit autorestart 1; C1 : Current sense voltage (VCS) 2; C2 : Supply voltage (VCC) 3; C3 : Feedback voltage (VFB) 4; C4 : BA voltage (VBA) Channel Channel Channel Channel Exit autorestart 1; C1 : Current sense voltage (VCS) 2; C2 : Supply voltage (VCC) 3; C3 : Feedback voltage (VFB) 4; C4 : BA voltage (VBA) External autoreatart enable (short BA pin to Gnd by 10Ω resistor & open) External autorestart enable (short BA pin to Gnd by 10Ω resistor & open) Figure 41 – External protection enable @ 85Vac Figure 42– External protection enable @ 265Vac Application Note 27 2012-09-19 25W 12V Demo board using ICE3BR1065J 12 Appendix 12.1 Slope compensation for CCM operation This demo board is designed in Discontinuous Conduction Mode ( DCM ) operation. If the application is designed in Continuous Conduction Mode ( CCM ) operation where the maximum duty cycle exceeds the 50% threshold, it needs to add the slope compensation network. Otherwise, the circuitry will be unstable. In this case, three more components ( 2 ceramic capacitors C17 / C18 and one resistor R19) is needed to add as shown in the circuit diagram below. Figure 43 – Circuit diagram switch mode power supply with slope compensation More information regarding how to calculate the additional components, see application note AN_SMPS_ICE2xXXX – available on the internet: www.infineon.com (directory : Home > Power ® Semiconductors > Integrated Power ICs > CoolSET F2) 13 References ® [1] Infineon Technologies, Datasheet “CoolSET -F3R ICE3BR1065J Off-Line SMPS Current Mode Controller with Integrated 650V CoolMOS® and Startup cell ( frequency jitter Mode ) in Dip-8” [2] Kyaw Zin Min, Kok Siu Kam Eric, Infineon Technologies, Application Note “CoolSET®-F3R (DIP-8, DIP7 & 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 28 2012-09-19