A N-REF -10W A DAPTER 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 Appl ic ati on Note AN - REF -10W ADAP TER V1.1, 2014-02-20 Power Management & M ultim arket Edition 2014-02-20 Published by Infineon Technologies AG, 81726 Munich, Germany. © 2014 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 (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. 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 Trademarks of Infineon Technologies AG AURIX™, C6 6™, 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 2011-11-11 Application Note AN-REF-10W ADAPTER 3 V1.1, 2014-02-20 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 Revision History Major changes since previous revision Date Version Changed By Change Description 20 Feb 2014 1.1 Kyaw Zin Min Update to new format 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: [email protected] Application Note AN-REF-10W ADAPTER 4 V1.1, 2014-02-20 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 Table of Contents Revision History .................................................................................................................................................... 4 Table of Contents .................................................................................................................................................. 5 1 Abstract .............................................................................................................................................. 7 2 Evaluation Board Photos ................................................................................................................. 7 3 List of Features of ICE2QS03G ........................................................................................................ 8 4 Technical Specifications for Reference Board .............................................................................. 8 5 5.1 5.2 5.3 5.4 5.5 Circuit Description ............................................................................................................................ 9 Mains Input Rectification and Filtering ................................................................................................ 9 PWM Control and switching MOSFET ................................................................................................ 9 Snubber Network ................................................................................................................................ 9 Output Stage ....................................................................................................................................... 9 Feedback Loop ................................................................................................................................... 9 6 6.1 6.2 6.3 6.4 6.5 Circuit Operation ............................................................................................................................. 10 Startup Operation .............................................................................................................................. 10 Normal Mode Operation .................................................................................................................... 10 Primary side peak current control ..................................................................................................... 10 Digital Frequency Reduction ............................................................................................................. 10 Burst Mode Operation ....................................................................................................................... 10 7 7.1 7.2 7.3 7.4 7.5 7.6 Protection Features ........................................................................................................................ 11 VCC over voltage and under voltage protection ............................................................................... 11 Foldback point protection .................................................................................................................. 11 Over load/Open loop protection ........................................................................................................ 11 Adjustable output overvoltage protection .......................................................................................... 11 Short winding protection.................................................................................................................... 11 Auto restart for over temperature protection ..................................................................................... 11 8 8.1 8.2 Circuit diagram ................................................................................................................................ 12 1st PCB artwork (top) ......................................................................................................................... 13 2nd PCB artwork (bottom) .................................................................................................................. 13 9 Component List ............................................................................................................................... 14 10 Transformer Construction.............................................................................................................. 15 11 11.1 11.2 11.3 11.4 11.5 11.6 Test Results ..................................................................................................................................... 16 Efficiency ........................................................................................................................................... 16 Input standby power .......................................................................................................................... 16 Line regulation ................................................................................................................................... 17 Load regulation ................................................................................................................................. 17 Maximum input power between low and high line ............................................................................ 17 EMI test results ................................................................................................................................. 18 12 12.1 12.2 12.3 12.4 Waveforms and Scope Plots .......................................................................................................... 19 Startup at Full Load ........................................................................................................................... 19 Drain and VCS voltage at maximum load ........................................................................................... 19 Zero Crossing Point during Normal Operation .................................................................................. 20 Load Transient Response ................................................................................................................. 20 Application Note AN-REF-10W ADAPTER 5 V1.1, 2014-02-20 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 12.5 12.6 Burst Mode Operation ....................................................................................................................... 21 Protection Mode ................................................................................................................................ 21 13 References ....................................................................................................................................... 22 Application Note AN-REF-10W ADAPTER 6 V1.1, 2014-02-20 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 1 Abstract This application note is an engineering report of a very small form factor reference design for universal input 10.5W 5V USB adapter. The adapter is using IFX ICE2QS03G, a second generation current mode control quasi-resonant flyback topology controller and IFX IPU60R950C6, a sixth generation of high voltage power CoolMOS™. The distinguishing features of this reference design are very small form factor, best in class low standby power, high efficiency, good EMI performance without using input common mode choke, very tight maximum input power control between low and high line and variious modes of protection for high reliable system. 2 Evaluation Board Photos ICE2QS03G 22.6mm IPU60R950C6 30.5mm 30.0mm Figure 1 – REF-ICE2QS03G & IPU60R950C6 10W ADAPTER (Dimensions LxWxH: 30.5x22.6x30 mm3) 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-REF-10W ADAPTER 7 V1.1, 2014-02-20 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 3 List of Features of ICE2QS03G Quasi resonant operation till very low load Active burst mode operation at light/no load for low standby input power (< 50mW) Digital frequency reduction with decreasing load HV startup cell with constant charging current Built-in digital soft-start Foldback correction and cycle-by-cycle peak current limitation Auto restart mode for VCC Overvoltage protection Auto restart mode for VCC Undervoltage protection Auto restart mode for openloop/overload protection Auto restart mode for Over temperature protection Latch-off mode for adjustable output overvoltage protection 4 Technical Specifications for Reference Board Input voltage 90Vac~264Vac Input frequency 50/60Hz Input Standby Power < 50mW @ no load Maximum input power(Peak Power) for full input range < ±5% of input power Output voltage 5V Output current 2.1A Output power 10.5W Active mode average efficiency(25%,50%,75% & 100%load) >78% at full load Minimum switching frequency at full load and minimum input voltage 40kHz Application Note AN-REF-10W ADAPTER 8 V1.1, 2014-02-20 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 5 Circuit Description 5.1 Mains Input Rectification and Filtering The AC line input side comprises the input fuse F1 as overcurrent protection. A rectified DC voltage (127V ~ 373V) is obtained through a bridge rectifier BR1 and a pi filter C1, L1, R13 and C2. The pi filer also attenuates the differential mode conducted EMI. 5.2 PWM Control and switching MOSFET The PWM pulse is generated by the Quasi Resonant PWM current-mode Controller ICE2QS03G and this PWM pulse drives the high power CoolMOS™, IPU60R950C6 (C6) which designed according to the revolutionary Superjunction (SJ) principle. The CoolMOS™ C6 provides all benefits of a fast switching SJ MOSFET while not sacrificing ease of use. It achieves extremely low conduction and switching losses and can make switching applications more efficient, more compact, lighter and cooler. The PWM switch-on is determined by the zero-crossing input signal and the value of the up/down counter. The PWM switch-off is determined by the feedback signal VFB and the current sensing signal VCS. ICE2QS03G also performs all necessary protection functions in flyback converters. Details about the information mentioned above are illustrated in the product datasheet. 5.3 Snubber Network A snubber network R3, C3 and D1 dissipate the energy of the leakage inductance and suppress ringing on the SMPS transformer. Due to the resonant capacitor (MOSFET’s drain source capacitance), the overshoot is relatively smaller than fixed frequency flyback converter. Thus the snubber resistor can be used with a larger one which will reduce the snubber loss. 5.4 Output Stage On the secondary side, 5V output, the power is coupled out via a schottky diode D3. The capacitors C8 and C10 provide energy buffering to reduce the output ripple and prevent interference between SMPS switching frequency and line frequency considerably. Storage capacitors C8 and C10 are designed to have an internal resistance (ESR) as small as possible. This is to minimize the output voltage ripple caused by the triangular current. 5.5 Feedback Loop For feedback, the output is sensed by the voltage divider of R1, R2 and R12 and compared to TL431 internal reference voltage. C17 and R11 comprise the compensation network. The output voltage of TL431 is converted to the current signal via optocoupler U1 and two resistors R9 and R14 for regulation control. Application Note AN-REF-10W ADAPTER 9 V1.1, 2014-02-20 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 6 Circuit Operation 6.1 Startup Operation Since there is a built-in startup cell in the ICE2QS03G, there is no need for external start up resistor, which can improve standby performance significantly. When VCC reaches the turn on voltage threshold 18V, the IC begins with a soft start. The soft-start implemented in ICE2QS03G is a digital time-based function. The preset soft-start time is 12ms with 4 steps. If not limited by other functions, the peak voltage on CS pin will increase step by step from 0.32V to 1V finally. After IC turns on, the Vcc voltage is supplied by auxiliary windings of the transformer. 6.2 Normal Mode Operation The secondary output voltage is built up after startup. The secondary regulation control is adopted with TL431 and optocoupler. The compensation network C17 and R11 constitutes the external circuitry of the error amplifier of TL431. This circuitry allows the feedback to be precisely controlled with respect to dynamically varying load conditions, therefore providing stable control. 6.3 Primary side peak current control The MOSFET drain source current is sensed via external resistor R8 and buffer network R7, C6. Since ICE2QS03G is a current mode controller, it would have a cycle-by-cycle primary current and feedback voltage control which can make sure the maximum power of the converter is controlled in every switching cycle. 6.4 Digital Frequency Reduction During normal operation, the switching frequency for ICE2QS03G is digitally reduced with decreasing load. At light load, the CoolMOS™ IPU60R950C6 will be turned on not at the first minimum drain-source voltage time, but on the nth. The counter is in range of 1 to 7, which depends on feedback voltage in a time-base. The feedback voltage decreases when the output power requirement decreases, and vice versa. Therefore, the counter is set by monitoring voltage VFB. The counter will be increased with low VFB and decreased with high VFB. The thresholds are preset inside the IC. 6.5 Burst Mode Operation At light load condition, the SMPS enters into Active Burst Mode. At this stage, the controller is always active but the Vcc must be kept above the switch off threshold. During active burst mode, the efficiency increase significantly and at the same time it supports low ripple on Vout and fast response on load jump. For determination of entering Active Burst Mode operation, three conditions apply: 1. The feedback voltage is lower than the threshold of VFBEB(1.25V). Accordingly, the peak current sense voltage across the shunt resistor is 0.1667; 2. The up/down counter is 7; 3. And a certain blanking time (tBEB=24ms). Once all of these conditions are fulfilled, the Active Burst Mode flip-flop is set and the controller enters Active Burst Mode operation. This multi-condition determination for entering Active Burst Mode operation prevents mis-triggering of entering Active Burst Mode operation, so that the controller enters Active Burst Mode operation only when the output power is really low during the preset blanking time. During active burst mode, the maximum current sense voltage is reduced from 1V to 0.34V so as to reduce the conduction loss and the audible noise. At the burst mode, the FB voltage is changing like a sawtooth between 3.0 and 3.6V. The feedback voltage immediately increases if there is a high load jump. This is observed by one comparator. As the current limit is 34% during Active Burst Mode a certain load is needed so that feedback voltage can exceed VLB (4.5V). After leaving active burst mode, maximum current can now be provided to stabilize VO. In addition, the up/down counter will be set to 1 immediately after leaving Active Burst Mode. This is helpful to decrease the output voltage undershoot Application Note AN-REF-10W ADAPTER 10 V1.1, 2014-02-20 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 7 Protection Features 7.1 VCC over voltage and under voltage protection During normal operation, the Vcc voltage is continuously monitored. When the Vcc voltage increases up to VVCCOVP or Vcc voltage falls below the under voltage lock out level VVCCoff, the IC will enter into autorestart mode. 7.2 Foldback point protection For a quasi-resonant flyback converter, the maximum possible output power is increased when a constant current limit value is used for all the mains input voltage range. This is usually not desired as this will increase additional cost on transformer and output diode in case of output over power conditions. The internal foldback protection is implemented to adjust the VCS voltage limit according to the bus voltage. Here, the input line voltage is sensed using the current flowing out of ZC pin, during the MOSFET on-time. As the result, the maximum current limit will be lower at high input voltage and the maximum output power can be well limited versus the input voltage. 7.3 Over load/Open loop protection In case of open control loop, feedback voltage is pulled up with internally block. After a fixed blanking time, the IC enters into auto restart mode. In case of secondary short-circuit or overload, regulation voltage VFB will also be pulled up, same protection is applied and IC will auto restart. 7.4 Adjustable output overvoltage protection During off-time of the power switch, the voltage at the zero-crossing pin ZC is monitored for output overvoltage detection. If the voltage is higher than the preset threshold 3.7V for a preset period 100μs, the IC is latched off. 7.5 Short winding protection The source current of the MOSFET is sensed via external resistor R8. If the voltage at the current sensing pin is higher than the preset threshold VCSSW of 1.68V during the on-time of the power switch, the IC is latched off. This constitutes a short winding protection. To avoid an accidental latch off, a spike blanking time of 190ns is integrated in the output of internal comparator. 7.6 Auto restart for over temperature protection The IC has a built-in over temperature protection function. When the controller’s temperature reaches 140 °C, the IC will shut down switch and enters into autorestart. This can protect power MOSFET from overheated. Application Note AN-REF-10W ADAPTER 11 V1.1, 2014-02-20 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 8 Circuit diagram Figure 2 – Schematics Application Note 12 20 February 2014 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 8.1 1st PCB artwork (top) Figure 3 – View from component side (left) and solder side (right) 8.2 2nd PCB artwork (bottom) Figure 4 – View from component side (left) and solder side (right) Application Note 13 20 February 2014 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 Component List 9 Component List Items 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 Designator BD1 C1 C10 C11 C17 C2 C3 C4 C5 C6 C7 C8 C9 CY1 D1 D2 D3 F1 IC1 L1 Q1 R1 R10 R11 R12 R13 R14 R2 R3 R4 R5 R6 R7 R8 R9 RA RB RC RD RD1 T1 U1 U2 USBPORT ZD1 L N Application Note Part Value B10S/0.5A, 1000V (bridge rectifier) 15uF/400V/105℃ 820uF/6.3V 10uF/25V/X7R 100nF/X7R 6.8uF/400V/105℃ 4.7nF/630V/X7R 2.2uF/25V/X7R 68pF/50V/NP0 100pF/50V/NP0 1nF/50V/X7R 820uF/6.3V 1nF/50V/X7R 2.2nF/250Vac F1J-600V/1A/1.25V BAV21W SBR10U45SP5-45V/10.0A/0.42V T1A/250V ICE2QS03G 0.9mH/0.1A/φ0.12 N MOS-IPU60R950C6 10K/0805,±1% 22.1R/0805,±5% 22.1K/0805,±5% N.A 51.1R/1206, ±1% 562R/0805, ±1% 10K/0805,±1% 56.2K/1206, ±1% 4R02/0805, ±5% 51.1K/0805, ±1% 10K/0805,±1% 100R/0805, ±1% 1.5R/0.5W, ±1% 150R/0805,±5% 43.2K/0805, ±1% 51.1K/0805, ±1% 75K/0805, ±1% 51.1K/0805, ±1% 47.5R/0805, ±1% 750341723 (EE19) SFH617A-3 TL431 6Pin-USB,90℃ MMSZ22T1G 37MM-UL1007 22#-red 37MM-UL1007 22#-black 14 Q'ty 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Manufacturer Murata Murata Murata Murata Murata Infineon Infineon Wurth Electronics Midcom 20 February 2014 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 Transformer Construction 10 Transformer Construction Core and material: EE19, 3C90 (other equivalent ferrite) Bobbin: EE19 Vertical Version Primary Inductance: Lp=1.6mH (±10%), measured between pin 6 and pin 4 Manufacturer and part number: Wurth Electronics Midcom (750341723) Transformer structure: Start 7 2 5 S 5 6 End No. of Turns Wire size 5 27 Ø0.20mm 4 65 Ø0.20mm x 1.1 0.05mm*7mm Copper foil F 9 Ø0.65mm T.I.W x 1.1 0.05mm*7mm Copper foil 2 70 Ø0.20mm Layer Auxiliary ½ Primary Shielded Secondary Shielded ½ Primary Notes: The transformer has 2 shielded winding and 1 Faraday Shield. The Faraday Shield is 1 layer 0.05mm*7mm copper foil over the core and connected to Pin5. Figure 5 – Transformer structure Application Note 15 20 February 2014 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 Test Results 11 Test Results 11.1 Efficiency Figure 6 – Efficiency vs. AC line voltage 11.2 Input standby power Figure 7 – Input standby power @ no load Vs. AC line input voltage ( measured by Yokogawa WT210 power meter - integration mode ) Application Note 16 20 February 2014 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 Test Results 11.3 Line regulation Figure 8 – Line regulation Vout @ full load vs. AC line input voltage 11.4 Load regulation Figure 9 – Load regulation Vout vs. output power 11.5 Maximum input power between low and high line Figure 10 – Maximum input power ( before overload protection ) vs. AC line input voltage Application Note 17 20 February 2014 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 Test Results 11.6 EMI test results The conducted EMI was measured by Schaffner (SMR4503) under test standard EN55022 or CISPR22 Class B. The demo board was set up at 10.5W with the input voltage at 115Vac and 230Vac. The Red curve(upper one) is the Quasi Peak data and the Green curve(lower one) is the Average data. Both of them can meet the regulations, pass conducted emissions EN55022 (CISPR 22) class B with > 6dB margin. Figure 11 – 230V Line results Figure 12 – 115V Line results Application Note 18 20 February 2014 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 Waveforms and Scope Plots 12 Waveforms and Scope Plots 12.1 Startup at Full Load Figure 13 – Constant Charging VCC at Startup CH1(Yellow) Supply Voltage, VCC CH2(Red) Zero Crossing Voltage, VZC CH3(Blue) Current Sense Voltage, VCS CH4(Green) Feedback Voltage, VFB 12.2 Figure 14 – Step Softstart CH1(Yellow) Supply Voltage, VCC CH2(Red) Zero Crossing Voltage, VZC CH3(Blue) Current Sense Voltage, VCS CH4(Green) Feedback Voltage, VFB Drain and VCS voltage at maximum load Figure 15 - Operation @ 90Vac and max. load Ch1=Vcs(Yellow), Ch3=Vds(Blue) Vin=90Vac, Iout=2.1A(full load) Vds_max=264V Application Note Figure 16 - Operation @ 264Vac and max. load Ch1=Vcs(Yellow), Ch3=Vds(Blue) Vin=264Vac, Iout=2.1A(full load) Vds_max=516V 19 20 February 2014 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 Waveforms and Scope Plots 12.3 Zero Crossing Point during Normal Operation Figure 17 – Working at 1st ZC CH1(Yellow) Current Sense Voltage, VCS CH3(Blue) MOSFET Dain-Source Voltage, VDS 12.4 Figure 18 – Working at 7th ZC CH1(Yellow) Current Sense Voltage, VCS CH2 MOSFET Dain-Source Voltage, VDS Load Transient Response Figure 19 – AC Output Ripple Undershoot 10% 100% load, 0.4A/us VO_max=5.026V VO_min=4.917V Vripple_pk_pk=109mV CH1 Output Voltage, Vo CH2 Output Current, Io Application Note Figure 20 – AC Output Ripple Overshoot 100% 10% load, 0.4A/us VO_max=5.051V VO_min=4.942V Vripple_pk_pk=109mV CH1 Output Voltage, Vo CH2 Output Current, Io 20 20 February 2014 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 Waveforms and Scope Plots 12.5 Burst Mode Operation 6th 7th Figure 22 – Leaving Burst Mode CH1(Yellow) Feedback Voltage, VFB CH2(Red) Zero Crossing Voltage, VZC CH3(Blue) Current Sense Voltage, VCS CH4(Green) Output Voltage, VO Condition: VFB>4.5V Figure 21 – Entering Burst Mode CH1(Yellow) Feedback Voltage, VFB CH2(Red) Zero Crossing Voltage, VZC CH3(Blue) Current Sense Voltage, VCS CH4(Green) Output Voltage, VO Condition: ZC=7, FB<1.25V, Blanking time = 26ms 12.6 Protection Mode Figure 24 – Over Load/Open Loop Protection CH1(Yellow) Feedback Voltage, VFB CH2(Red) Zero Crossing Voltage, VZC CH3(Blue) Current Sense Voltage, VCS CH4(Green) Supply Voltage, Vcc Condition: VFB>4.5V for 30ms Figure 23 – Vout Over Voltage Protection CH1(Yellow) Feedback Voltage, VFB CH2(Red) Zero Crossing Voltage, VZC CH3(Blue) Output Voltage, VO CH4(Green) Supply Voltage, Vcc Condition: VO >6.7V (VZC>3.7V) Application Note 21 20 February 2014 10W 5V Adapter Reference Board with ICE2QS03G & IPU60R950C6 AN-PS0080 References 13 References [1] ICE2QS03G datasheet, Infineon Technologies AG [2] IPU60R950C6 datasheet, 600V CoolMOS™ C6 Power Transistor [3] Converter Design Using the Quasi-Resonant PWM Controller ICE2QS01, Infineon Technologies AG, 2006. [ANPS0003] [4] Design tips for flyback converters using the Quasi-Resonant PWM controller ICE2QS01, Infineon Technologies, 2006. [ANPS0005] [5] Determine the switching frequency of Quasi-Resonant flyback converters designed with ICE2QS01, Infineon Technologies, 2006. [ANPS0004] [6] ICE2QS03G design guide. [ANPS0027] [7] 36W Evaluation Board with Quasi-Resonant PWM Controller ICE2QS03G, 2011. [AN-PS0040] Application Note 22 20 February 2014 w w w . i n f i n e o n . c o m Published by Infineon Technologies AG