Application Note, V1.0, Dec 2011 AN-EVAL3GS03LJG 65W 19.5V SMPS Evaluation Board with F3 PWM controller ICE3GS03LJG 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 © 2011 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. 65W 19.5V Demo board using ICE3GS03LJG on board Revision History: Previous Version: Page 2011-12 none Subjects (major changes since last revision) 65W 19.5V SMPS Evaluation Board with F3 PWM controller ICE3GS03LJG: 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] V1.0 AN-PS0060 65W 19.5V Demo board using ICE3GS03LJG on board 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 5.14 5.15 Circuit Description ........................................................................................................................ 7 Introduction...................................................................................................................................... 7 Line Input......................................................................................................................................... 7 Start up ............................................................................................................................................ 7 Operation mode .............................................................................................................................. 7 Soft start .......................................................................................................................................... 7 RCD Clamper circuit ....................................................................................................................... 7 Main switcher .................................................................................................................................. 7 Gate drive ........................................................................................................................................ 7 Peak current control of primary current........................................................................................... 8 Output Stage ................................................................................................................................... 8 Feedback and regulation................................................................................................................. 8 Blanking Window for Load Jump .................................................................................................... 8 Active Burst Mode ........................................................................................................................... 8 Jitter mode....................................................................................................................................... 9 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 ESD test ........................................................................................................................................ 18 Lightning surge test ....................................................................................................................... 18 Conducted EMI ............................................................................................................................. 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 to source 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 (Latch off) .......................................................................................... 25 External protection enable (Latch off) ........................................................................................... 25 Over load protection (built-in + extended blanking time) (Auto restart) ........................................ 26 Open loop protection (Auto restart) ............................................................................................... 26 VCC under voltage/Short optocoupler protection (Auto restart) ..................................................... 27 12 References ................................................................................................................................... 27 Application Note 4 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 1 Abstract This document is an engineering report that describes a universal input power supply designed in a 19.5V 65W off line flyback converter that utilizes the F3 PWM controller ICE3GS03LJG. The application board is operated in discontinuous current mode (DCM) and is running at 130 kHz switching frequency. It has one output voltage with secondary side control regulation. It is especially suitable for AC/DC power supply such as LCD monitors, adapters for printers and notebook computers, DVD players and recorder, Blue-Ray DVD player and recorder, set-top boxes and industrial auxiliary power supplies. The ICE3GS03LJG is a current mode PWM controller. With the 500V startup cell, active burst mode and BiCMOS technologies, the standby power can be <100mW at no load. The frequency jitter mode and the soft gate drive can give a low EMI performance. The built-in 20ms blanking window and the extendable blanking time approach can prevent the IC from entering the auto restart mode due to over load protection unintentionally. The outstanding propagation delay compensation feature can allow a very precise current limit between low line and high line. For this IC, it provides both auto-restart and latch off protection mode. For those serious faults such as Vcc over-voltage, over temperature, short transformer winding, etc, the IC will enter the latched off protection mode. For those less severe case such as the over load, open loop, Vcc under-voltage & short opto-coupler, it enters the auto restart protection mode. In case it needs customer defined protection, the external latch off enable feature can fulfill the requirement. 2 Evaluation Board Figure 1 – EVAL3GS03LJG This document contains the list of features, the power supply specification, schematic, bill of material and the transformer construction drawing. Typical operating characteristics and performance curves with scope waveforms are presented at the rear of the report. Application Note 5 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 3 List of Features 500V Startup Cell switched off after Start Up Active Burst Mode for lowest Standby Power Fast load jump response in Active Burst Mode 130 kHz internally fixed switching frequency Built-in Latched Off Protection Mode for Overtemperature, Overvoltage & Short Winding Auto Restart Protection Mode for Overload, Open Loop,VCC Undervoltage & Short Optocoupler Built-in Soft Start Built-in blanking window with extendable blanking time for short duration high current External latch off enable function Max Duty Cycle 75% Overall tolerance of Current Limiting < ±5% Internal PWM Leading Edge Blanking BiCMOS technology provide wide VCC range Frequency jitter and soft gate driving for low EMI 4 Technical Specifications Input voltage 85VAC~265VAC Input frequency 50Hz, 60Hz Input Standby Power < 100mV @ no load Output voltage and current 19.5V +/- 2% Output current 3.34A Output power 65W Average Efficiency >82% (115Vac & 230Vac) Output ripple voltage < 100mVp-p Application Note 6 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 5 Circuit Description 5.1 Introduction The EVAL3GS03LJG demo board is an off line flyback switch mode power supply (SMPS) using the ICE3GS03LJG PWM IC from the Infineon PWM (fixed frequency) controller. The circuit, shown in Figure 2, details a 19.5V, 65W power supply that operates from an AC line input voltage range of 85Vac to 265Vac, suitable for applications requiring either an open frame supply or an enclosed adapter. 5.2 Line Input The AC input side comprises the input fuse F1 as over-current protection. The common mode choke L11 and L12, X-capacitors C11 and C14 and Y-capacitor C12 act as EMI suppressors. A varistor VAR (optional) is added to absorb the line transient while a NTC (optional) is added to reduce the inrush surge current during start up. A rectified DC voltage (120V ~ 375V) 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 ICE3GS03LJG, there is no need for external start up resistors. The startup cell is connecting the HV pin of the IC. Once the voltage is built up at the HV pin of the ICE3GS03LJG, the startup cell will charge up the Vcc capacitor C16 and C110. 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 and filtering capacitors C16 and C110. Resistor R12 is used for current limiting. In order not to exceed the maximum voltage at Vcc pin, an external zener diode ZD11 (optional) and R13 (optional) is added to clamp the voltage. 5.5 Soft start The Soft-Start time is built-in 10ms. After the Vcc hits UVLO at 18V, it starts the soft-start phase. 5.6 RCD Clamper circuit While turning off the switch Q11, the clamper circuit R11, C15 and D11 absorbs the current caused by transformer leakage inductance once the voltage exceeds clamper circuit voltage. Then drain to source voltage is well below the maximum break down voltage. 5.7 Main switcher Q1 is the main switcher for the system. It has a low Rdson to reduce the conduction loss. A drain-source capacitor C111 is added to the MOSFET to reduce the switching noise so as to get a better EMI performance. 5.8 Gate drive The gate drive current is 0.17A push and 0.39A pull. The gate on signal has installed with a slope controlled rising edge feature which make the driving softly. If it needs to optimize the EMI performance, a turn off diode (D13) is added in parallel with the gate drive resistor (R16) so as to turn the device off faster than it is turned on. Application Note 7 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 5.9 Peak current control of primary current The power MOSFET drain source current is sensed via external shunt resistors R14 and R15 which determine the tolerance of the current limit control. Since ICE3GS03LJG 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. Besides, propagation delay compensation is implemented to ensure the maximum input current/power can be controlled in an even tighter manner. The demo board shows app. +/-4.81% (refer to Figure 12). 5.10 Output Stage The power is coupled to the secondary side through schottky diode D21. The capacitor C22 provides energy buffering and the cascading LC filter L21 and C23 is used to reduce the output voltage ripple. The capacitor C22 is selected to have a low internal resistance (ESR) to minimize the output voltage ripple. 5.11 Feedback and regulation The output voltage is controlled by a TL431 reference control IC (IC21). This device incorporates the voltage reference as well as the error amplifier. Compensation network C25, C26, R24, R25, R26, R27 and R28 constitutes the loop compensation circuit. 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 to transmit the control signal to the “Feedback” input of the ICE3GS03LJG device. The selected optocoupler should meet DIN VDE 884 requirements for a wider creepage distance. 5.12 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. There are 2 modes for the blanking time setting; basic mode and the extendable mode. If there is no capacitor added to the BL pin, it would fall into the basic mode; i.e. the blanking time is set at 20ms. If a longer blanking time is required, a capacitor, C19 can be added to BL pin to extend it. The extended time can be achieved by an internal 13uA constant current at BL pin to charge C19 (CBK=100nF) from 0.9V to 4.0V. Thus the overall blanking time is the addition of 20ms and the extended time. 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 + ( 4.0 − 0.9) * CBK = 20ms + 238461.5 * CBK = 43.85ms IBK The blanking time to enter the Active Burst Mode is built-in at 20ms with no extension. If a low load condition is detected when VFB is falling below 1.23V, the system will only enter Active Burst Mode after 20ms blanking time while VFB is still below 1.23V. Note: A filter capacitor (e.g. 100pF) may be needed to add to the BL pin if the noises cannot be avoided to enter that pin in the physical PCB layout. Otherwise, some protection features may be mis-triggered and the system may not be working properly. 5.13 Active Burst Mode 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; i.e. 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 1.23V, 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 1V to 0.25V 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 0.45mA. At burst mode, the FB voltage is changing like a sawtooth between 3.0 and 3.5V. To leave Burst Mode, FB voltage must exceed 4.2V. It will Application Note 8 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board reset the Active Burst Mode and turn the SMPS into Normal Operating Mode. The maximum current; i.e. current sense voltage limit resume to 1V, can then be provided to stabilize VOUT. 5.14 Jitter mode The ICE3GS03LJG has frequency jittering feature to reduce the EMI noise. The jitter frequency is internally set at 130 kHz (±5.2 kHz) and the jitter period is set at 4ms. 5.15 Protection modes Protection is one of the major factors to determine whether the system is safe and robust. Therefore, sufficient protection is a must. ICE3GS03LJG provides all the necessary protections to ensure the system is operating safely. There are 2 kinds of protection mode; auto-restart and latch off mode. When there are serious faults such as Vcc over-voltage, over temperature and short winding, it enters the latch off mode. For those less severe faults such as over load, open loop, Vcc under-voltage and short optocoupler, it enters the auto-restart mode. In addition, there is an external latch enable feature which is suitable for those tailor-made protection features. A list of protections and the failure conditions are showed in the below table. Protection function Failure condition Vcc Over-voltage Vcc > 25.5V Latch off Over-temperature (controller junction) TJ > 130°C Latch off Short winding / Short diode VCS > 1.66V Latch off External Latch off enable VBL < 0.33V Latch off Over-load / Open loop VFB > 4.2V and VBL > 4.0V and after Blanking time Auto Restart Vcc Under-voltage / short Opto-coupler Vcc < 10.5V Auto Restart Application Note 9 Protection Mode 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 6 Circuit Diagram Figure 2 – 65W 19.5V ICE3GS03LJG power supply schematic Application Note 10 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board N.B.: In order to get the optimized performance of the PWM controller, the grounding of the PCB layout must be taken very carefully. From the circuit diagram above, it shows that the grounding for the PWM controller can be split into several groups; signal ground, Vcc ground, Current sense resistor ground and EMI return ground. All the split ground should be connected to the bulk capacitor ground separately. • Signal ground includes all small signal grounds connecting to the PWM controller GND pin such as filter capacitor ground of C17, C18, C19, C110 and opto-coupler (IC12) ground. • Vcc ground includes the Vcc capacitor ground, C16 and the auxiliary winding ground; pin 5 of the power transformer. • Current Sense resistor ground includes current sense resistor R14 and R15. Application Note 11 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 7 PCB Layout 7.1 Top side Figure 3 – Top side component legend 7.2 Bottom side Figure 4 – Bottom side copper & component legend Application Note 12 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 8 Component List No. 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 Designator BR1 C11 C12 C13 C14 C15 C16 C18, C26 C22 C23 C25 C19,C110 C111 D11 D12 D13 D21 F1 HS11, HS21 IC11 IC12 IC21 J11,J12,J13,J21,NTC,L22,R17 L N, +19.5V Com L11 L12 L21 Q11 R11 R12 R14, R15 R16 R22 R23 R24 R26 R27 R28 TR1 Application Note Component description KBU4J(600V 4A) 330nF/305V 3.3nF/250V 120uF/400V 100nF/305V 10nF/ 630V 22uF/35V 1.2nF/63V 2200uF/25V 1000uF/25V 150nF/ 63V 100nF/ 63V 150pF/1kV UF4005(600V, 1A) 1N485B(200V, 0.2A) 1N4148 VF30200C(200V, 30A) 2A/250V Heat Sink ICE3GS03LJG SFH617 A3 TL431 Jumper Connector 20mH 2A 6.8mH 1.3A 1.5uH,6.3A 650V(0.6Ω, 7.3A) 39k/2W 200R 0.51R(1W, 1%) 47R 820R 1.2k 100k 3.6k/1% 470R/1% 24k/1% 80µH(24:5:4)ER28/17/11 13 Part No. KBU4J-E4/51 B32922C3334M+*** DE1E3KX332MA4BL01 B43504A9127M00* B32922A2104+*** Manufacturer VISHAY EPCOS MURATA EPCOS EPCOS DESD33A151KA2B UF4005 MURATA VISHAY VF30200C-E3/4W VISHAY ICE3GS03LJG INFINEON B82734R2202B030 B82731T2132A020 EPCOS EPCOS SPA07N60C3 INFINEON B66433G0000X172 EPCOS 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 9 Transformer Construction Core and material: ER28/17/11 (N72) Bobbin: BEER28L-1110CPFR (Vertical type) Primary Inductance, Lp = 80uH (±5%), measured between pin 1 and pin 3 (Gapped to Inductance) Transformer structure: 1 12 2 11 3 5 6 Figure 5 – Transformer structure and top view of transformer complete Wire size requirement: Start Application Note Stop No. of turns Wire size Layer 1 2 12 3XAWG#28 1 11 12 5 6XAWG#26 Secondary 2 3 12 3XAWG#28 1 5 6 4 2XAWG#28 14 /2 Primary /2 Primary Aux. 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 10 Test results 10.1 Efficiency Figure 6 – Efficiency Vs. AC line input voltage Figure 7 – Efficiency Vs. output power @ low and high Line Application Note 15 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 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 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 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 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 10.5 Maximum input power Figure 12 – Maximum input power (before overload protection) vs. AC line input voltage 10.6 ESD test Pass (EN61000-4-2): 20kV for contact discharge (without surge absorber device) 10.7 Lightning surge test Pass (EN61000-4-5): 4kV for line to earth (without surge absorber device) Pass (EN61000-4-5): 6kV for line to earth (with surge absorber device; SA1 & SA2 (DA38-102MB)) Application Note 18 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 10.8 Conducted EMI The conducted EMI 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 (65W) with input voltage of 115Vac and 230Vac. Figure 13 – Maximum load (65W) with 115 Vac (Line) Figure 14 – Maximum load (65W) with 115 Vac (Neutral) Application Note 19 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board Figure 15 – Maximum load (65W) with 230 Vac (Line) Figure 16 – Maximum load (65W) with 230 Vac (Neutral) Pass conducted EMI EN55022 (CISPR 22) class B with > 6dB margin. Application Note 20 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 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 552ms 552ms Channel 1; C1 : Drain voltage (VDrain) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BL voltage (VBL) Channel 1; C1 : Drain voltage (VDrain) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BL voltage (VBL) Startup time = 552ms Startup time = 552ms 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 9.3ms 9.3ms Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BL voltage (VBL) Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BL voltage (VBL) Soft Star time = 9.3ms(32 steps) Soft Star time = 9.3ms(32 steps) Figure 19 – Soft Start @ 85Vac & max. load Figure 20– Soft Start @ 265Vac & max. load Application Note 21 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 11.3 Frequency jittering 130kHz 130kHz 138kHz 138kHz Channel 1; C1 : Drain to source voltage (VDS) Channel 1; C1 : Drain to source voltage (VDS) Frequency jittering from 130 kHz ~ 138kHz Frequency jittering from 130 kHz ~ 138kHz Figure 21 – Frequency jittering @ 85Vac and max. load Figure 22 – Frequency jittering @ 265Vac and max. load 11.4 Drain to source voltage and current @ maximum load Channel 1; C1 : Drain Source Voltage ( VDS ) Channel 2; C2 : Drain Current ( IDS ) Duty cycle = 50%, VDS_peak=308V Figure 23 – Operation @ Vin = 85Vac and max. load Application Note Channel 1; C1 : Drain Source Voltage ( VDS ) Channel 2; C2 : Drain Current ( IDS ) Duty cycle = 10.5% VDS_peak=588V Figure 24 – Operation @ Vin = 265Vac and max. load 22 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 11.5 Load transient response (Dynamic load from 10% to 100%) Channel 2; C2 : Output Ripple Voltage ( Vo_ripple ) Channel 2; C2 : Output Ripple Voltage ( Vo_ripple ) Vripple_pk_pk=227.4mV (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 Vripple_pk_pk=225.9mV (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 Figure 26 – Load transient response @ 265Vac 11.6 Output ripple voltage at maximum load Channel 2; C2 : Output Ripple Voltage ( Vo_ripple ) Channel 2; C2 : Output Ripple Voltage ( Vo_ripple ) Vripple_pk_pk=41.8mV Probe terminal end with decoupling capacitor of 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter Figure 27 – AC output ripple @ Vin=85Vac and max. load Vripple_pk_pk=43.3mV Probe terminal end with decoupling capacitor of 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter Figure 28 – AC output ripple @ Vin=265Vac and max. load Application Note 23 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 11.7 Output ripple voltage during burst mode at 1 W load Channel 2; C2 : Output Ripple Voltage ( Vo_ripple ) Vripple_pk_pk=37.4mV Probe terminal end with decoupling capacitor 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter Channel 2; C2 : Output Ripple Voltage ( Vo_ripple ) of Figure 29 – AC output ripple @ 85Vac and 1W load Vripple_pk_pk = 48.9mV Probe terminal end with decoupling capacitor of 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter Figure 30 – AC output ripple @ 265Vac and 1W load 11.8 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 : BL voltage (VBL) Blanking time to enter burst mode : 19ms (load step down from 3.34A to 0.051A) 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 : BL voltage (VBL) Blanking time to enter burst mode : 19ms (load step down from 3.34A to 0.051A) Figure 32 – Active burst mode @ Vin=265Vac 24 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 11.9 Vcc overvoltage protection (Latch off) VCC OVP VCC OVP Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BL voltage (VBL) VCC OVP (R28 disconnected during system operating at light load) Figure 33 – Vcc overvoltage protection @ 85Vac Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BL voltage (VBL) VCC OVP (R28 disconnected during system operating at light load) Figure 34 – Vcc overvoltage protection @ 265Vac 11.10 External protection enable (Latch off) Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BL voltage (VBL) External protection enable (short BL pin to Gnd by 10Ω resistor) Figure 35 – External protection enable @ 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 : BL voltage (VBL) External protection enable (short BL pin to Gnd by 10Ω resistor) Figure 36 – External protection enable @ 265Vac 25 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 11.11 Over load protection (built-in + extended blanking time) (Auto restart) Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BL voltage (VBL) Over load protection with 42.84ms(19+22.84) blanking time (output load change from 3.34A to 5A, C19=100nF) Figure 37 – Over load protection with built-in+extended blanking time @ 85Vac Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BL voltage (VBL) Over load protection with 42.84ms(19+22.84) blanking time (output load change from 3.34A to 5A, C19=100nF) Figure 38 – Over load protection with built-in+extended blanking time @ 265Vac 11.12 Open loop protection (Auto restart) Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BL voltage (VBL) Open loop protection (R28 disconnected during system operation at max. load) – over load protection Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BL voltage (VBL) Open loop protection (R28 disconnected during system operation at max. load) – over load protection Figure 39 – Open loop protection @ 85Vac Figure 40 – Open loop protection @ 265Vac Application Note 26 2011-12-15 65W 19.5V Demoboard using ICE3GS03LJG on board 11.13 VCC under voltage/Short optocoupler protection (Auto restart) Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BL voltage (VBL) Channel 1; C1 : Current sense voltage (VCS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback voltage (VFB) Channel 4; C4 : BL voltage (VBL) 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 41 – Vcc under voltage/short optocoupler protection @ 85Vac Figure 42 – Vcc under voltage/short optocoupler protection @ 265Vac 12 References [1] [2] [3] Infineon Technologies, Datasheet “F3 PWM controller ICE3GS03LJG Off-Line SMPS Current Mode Controller with Integrated 500V Startup Cell (Latched and Frequency Jitter Mode)” Infineon Technologies, Application Note “AN-SMPS-ICE2xXXX-1 CoolSETTM ICE2xXXX for OFFLine Switch Mode Power Supply (SMPS)” Infineon Technologies, Application Note “ICE3XS03LJG F3 Fixed Frequency PWM Controller (Latch & Jitter version) Design Guide” Application Note 27 2011-12-15