12w 12v smps evaluation board with coolset - infineon

Appl icat ion Note AN-EVAL-3RBR4765JZ V1.1, 2013-07-15

CoolSET™ F3R Family ICE3RBR4765JZ

12V 12W SMPS evaluat ion board with ICE3RBR4765JZ ANPS0078

Power Management & Mult imarket

Edition 2013-07-15

Published by Infineon Technologies AG,

81726 Munich, Germany.

© 2013 Infineon Technologies AG

All Rights Reserved.

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12V 12W SMPS evaluation board with ICE3RBR4765JZ ANPS0078

Application Note AN-EVAL-3RBR4765JZ 3 V1.1, 2013-07-15

Trademarks of Infineon Technologies AG

AURIX™, C166™, CanPAK™, CIPOS™, CIPURSE™, EconoPACK™, CoolMOS™, CoolSET™, CORECONTROL™, CROSSAVE™, DAVE™, DI-POL™, EasyPIM™, EconoBRIDGE™, EconoDUAL™, EconoPIM™, EconoPACK™, EiceDRIVER™, eupec™, FCOS™, HITFET™, HybridPACK™, I²RF™, ISOFACE™, IsoPACK™, MIPAQ™, ModSTACK™, my-d™, NovalithIC™, OptiMOS™, ORIGA™, POWERCODE™; PRIMARION™, PrimePACK™, PrimeSTACK™, PRO-SIL™, PROFET™, RASIC™, ReverSave™, SatRIC™, SIEGET™, SINDRION™, SIPMOS™, SmartLEWIS™, SOLID FLASH™, TEMPFET™, thinQ!™, TRENCHSTOP™, TriCore™.

Other Trademarks

Advance Design System™ (ADS) of Agilent Technologies, AMBA™, ARM™, MULTI-ICE™, KEIL™, PRIMECELL™, REALVIEW™, THUMB™, µVision™ of ARM Limited, UK. AUTOSAR™ is licensed by AUTOSAR development partnership. Bluetooth™ of Bluetooth SIG Inc. CAT-iq™ of DECT Forum. COLOSSUS™, FirstGPS™ of Trimble Navigation Ltd. EMV™ of EMVCo, LLC (Visa Holdings Inc.). EPCOS™ of Epcos AG. FLEXGO™ of Microsoft Corporation. FlexRay™ is licensed by FlexRay Consortium. HYPERTERMINAL™ of Hilgraeve Incorporated. IEC™ of Commission Electrotechnique Internationale. IrDA™ of Infrared Data Association Corporation. ISO™ of INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. MATLAB™ of MathWorks, Inc. MAXIM™ of Maxim Integrated Products, Inc. MICROTEC™, NUCLEUS™ of Mentor Graphics Corporation. MIPI™ of MIPI Alliance, Inc. MIPS™ of MIPS Technologies, Inc., USA. muRata™ of MURATA MANUFACTURING CO., MICROWAVE OFFICE™ (MWO) of Applied Wave Research Inc., OmniVision™ of OmniVision Technologies, Inc. Openwave™ Openwave Systems Inc. RED HAT™ Red Hat, Inc. RFMD™ RF Micro Devices, Inc. SIRIUS™ of Sirius Satellite Radio Inc. SOLARIS™ of Sun Microsystems, Inc. SPANSION™ of Spansion LLC Ltd. Symbian™ of Symbian Software Limited. TAIYO YUDEN™ of Taiyo Yuden Co. TEAKLITE™ of CEVA, Inc. TEKTRONIX™ of Tektronix Inc. TOKO™ of TOKO KABUSHIKI KAISHA TA. UNIX™ of X/Open Company Limited. VERILOG™, PALLADIUM™ of Cadence Design Systems, Inc. VLYNQ™ of Texas Instruments Incorporated. VXWORKS™, WIND RIVER™ of WIND RIVER SYSTEMS, INC. ZETEX™ of Diodes Zetex Limited.

Last Trademarks Update 2011-11-11



Revision History

Major changes since previous revision

Date Version Changed By Change Description

15 Jul 2013 1.1 Kyaw Zin Min update format, remove appendix

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Table of Contents

Revision History .............................................................................................................................................. 4

Table of Contents ............................................................................................................................................ 5

1 Abstract ........................................................................................................................................ 7

2 Evaluation board .......................................................................................................................... 7

3 List of features ............................................................................................................................. 8

4 Technical specifications .............................................................................................................. 8

5 Circuit description ....................................................................................................................... 9 5.1 Introduction .................................................................................................................................... 9 5.2 Line input ....................................................................................................................................... 9 5.3 Start up .......................................................................................................................................... 9 5.4 Operation mode ............................................................................................................................. 9 5.5 Soft start ........................................................................................................................................ 9 5.6 RCD clamper circuit ....................................................................................................................... 9 5.7 Peak current control of primary current ........................................................................................... 9 5.8 Output stage .................................................................................................................................. 9 5.9 Feedback and regulation .............................................................................................................. 10 5.10 Blanking window for load jump ..................................................................................................... 10 5.11 Active burst mode ........................................................................................................................ 10 5.12 Jitter mode ................................................................................................................................... 10 5.13 Protection modes ......................................................................................................................... 10

6 Circuit diagram ........................................................................................................................... 12

7 PCB layout .................................................................................................................................. 13 7.1 Top side ....................................................................................................................................... 13 7.2 Bottom side .................................................................................................................................. 13

8 Component list ........................................................................................................................... 14

9 Transformer construction .......................................................................................................... 15

10 Test results ................................................................................................................................. 16 10.1 Efficiency ..................................................................................................................................... 16 10.2 Input standby power ..................................................................................................................... 17 10.3 Line regulation ............................................................................................................................. 18 10.4 Load regulation ............................................................................................................................ 18 10.5 Maximum input power .................................................................................................................. 19 10.6 Electrostatic discharge/ESD test (EN6100-4-2)............................................................................. 19 10.7 Surge/Lightning strike test (EN61000-4-5) .................................................................................... 19 10.8 Conducted emissions (EN55022 class-B) ..................................................................................... 20

11 Waveforms and scope plots ...................................................................................................... 22 11.1 Start up at low and high AC line input voltage and maximum load................................................. 22 11.2 Soft start at low and high AC line input voltage and maximum load ............................................... 22 11.3 Frequency jittering........................................................................................................................ 23 11.4 Drain voltage and current @ maximum load ................................................................................. 23 11.5 Load transient response (Dynamic load from 10% to 100%) ......................................................... 24 11.6 Output ripple voltage at maximum load ......................................................................................... 24



11.7 Output ripple voltage during burst mode at 1 W load ..................................................................... 25 11.8 Entering active burst mode ........................................................................................................... 25 11.9 Vcc overvoltage protection ........................................................................................................... 26 11.10 Over load protection (built-in + extended blanking time) ................................................................ 26 11.11 Open loop protection .................................................................................................................... 27 11.12 VCC under voltage/Short optocoupler protection ............................................................................ 27 11.13 Auto restart enable ....................................................................................................................... 28

12 References ................................................................................................................................. 28


Abstract


1 Abstract

This document is an engineering report of a universal input 12V 12W off-line flyback converter power supply utilizing IFX F3R CoolSET™ ICE3RBR4765JZ. The application demo board is operated in Discontinuous Conduction Mode (DCM) and is running at 65 kHz switching frequency. It has a one output voltage with secondary side control regulation. It is especially suitable for small power supply such as DVD player, set-top box, game console, charger and auxiliary power of high power system, etc. The ICE3RBR4765JZ is the latest version of the CoolSET™. Besides having the basic features of

the F3R CoolSET™ such as Active Burst Mode,

propagation delay compensation, soft gate drive, auto restart protection for serious fault (Vcc over voltage protection, Vcc under voltage protection, over temperature, over-load, open loop and short opto-coupler), it also has the BiCMOS technology design, built-in soft start time, built-in and extendable blanking time, frequency jitter feature with built-in jitter period and external auto-restart enable, etc. The particular features needs to be stressed are the best in class low standby power and the good EMI performance.

2 Evaluation board

Figure 1 – EVAL3RBR4765JZ

This document contains the list of features, the power supply specification, schematic, bill of material and the transformer construction documentation. Typical operating characteristics such as performance curve and scope waveforms are showed at the rear of the report.


List of features


3 List of features

650V avalanche rugged CoolMOS™ with built-in Startup Cell

Active Burst Mode for lowest Standby Power

Fast load jump response in Active Burst Mode

65 kHz internally fixed switching frequency

Auto Restart Protection Mode for Overload, Open Loop, Vcc Undervoltage, Overtemperature & Vcc Overvoltage

Built-in Soft Start

Built-in blanking window with extendable blanking time for short duration high current

External auto-restart enable pin

Max Duty Cycle 75%

Overall tolerance of Current Limiting < ±5%

Internal PWM Leading Edge Blanking

BiCMOS technology provides wide VCC range

Built-in Frequency jitter feature and soft driving for low EMI

4 Technical specifications

Input voltage 85VAC~265VAC

Input frequency 60Hz

Input Standby Power < 50mW at no load

Output voltage 12V

Output current 1A

Output power 12W

Active mode average efficiency(25%,50%,75% & 100%load) >84%

Output ripple voltage < 50mVp-p


Circuit description


5 Circuit description

5.1 Introduction

The EVAL3RBR4765JZ demo board is a low cost off line flyback switch mode power supply ( SMPS ) using the ICE3RBR4765JZ integrated power IC from the CoolSET™-F3R family. The circuit, shown in Figure 2, details a 12V, 12W power supply that operates from an AC line input voltage range of 85Vac to 265Vac, suitable for applications in open frame supply or enclosed adapter.

5.2 Line input

The AC line input side comprises the input fuse F1 as over-current protection. The choke L11, X-capacitor C11 and Y-capacitor C12 act as EMI suppressors. Optional surge absorber device SA1, SA2 and varistor VAR can absorb high voltage stress during lightning surge test. A rectified DC voltage (120V ~ 374V) is obtained through the bridge rectifier BR1 and the input bulk capacitor C13.

5.3 Start up

Since there is a built-in startup cell in the ICE3RBR4765JZ, there is no need for external start up resistors. The startup cell is connecting the drain pin of the IC. Once the voltage is built up at the Drain pin of the ICE3RBR4765JZ, the startup cell will charge up the Vcc capacitor C16 and C17. When the Vcc voltage exceeds the UVLO at 18V, the IC starts up. Then the Vcc voltage is bootstrapped by the auxiliary winding to sustain the operation.

5.4 Operation mode

During operation, the Vcc pin is supplied via a separate transformer winding with associated rectification D12 and buffering C16, C17. Resistor R12 is used for current limiting. In order not to exceed the maximum voltage at Vcc pin, an external zener diode ZD11 and resistor R13 can be added.

5.5 Soft start

The Soft-Start is a built-in function and is set at 20ms.

5.6 RCD clamper circuit

While turns off the CoolMOS®, the clamper circuit R11, C15 and D11 absorbs the current caused by transformer

leakage inductance once the voltage exceeds clamp capacitor voltage. Finally drain-source voltage of CoolMOS™is lower than maximum break down voltage of CoolMOS

®.

5.7 Peak current control of primary current

The CoolMOS™drain source current is sensed via external shunt resistors R14 and R15 which determine the tolerance of the current limit control. Since ICE3RBR4765JZ is a current mode controller, it would have a cycle-by-cycle primary current and feedback voltage control and can make sure the maximum power of the converter is controlled in every switching cycle. Besides, the patented propagation delay compensation is implemented to ensure the maximum input power can be controlled in an even tighter manner throughout the wide range input voltage. The demo board shows approximately +/-0.5% (refer to Figure 12).

5.8 Output stage

On the secondary side the power is coupled out by a schottky diode D21. The capacitor C22 provides energy buffering following with the LC filter L21 and C24 to reduce the output voltage ripple considerably. Storage capacitor C22 is selected to have an internal resistance as small as possible (ESR) to minimize the output voltage ripple.


Circuit description


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 and R27 constitutes the external circuitry of the error amplifier of IC21. This circuitry allows the feedback to be precisely matched to dynamically varying load conditions and provides stable control. The maximum current through the optocoupler diode and the voltage reference is set by using resistors R22 and R23. Optocoupler IC12 is used for floating transmission of the control signal to the “Feedback” input via capacitor C18 of the ICE3RBR4765JZ control device. The optocoupler used meets DIN VDE 884 requirements for a wider creepage distance.

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 ( BKC =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.

msCBKmsIBK

CBKmsExtendedBasicTblanking 2.31*5.23846120

*)9.00.4(20

5.11 Active burst mode

At light load condition, the SMPS enters into Active Burst Mode. At this start, the controller is always active and thus the 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 ICE3RBR4765JZ has frequency jittering feature to reduce the EMI noise. The jitter frequency is internally set at 65 kHz (+/- 2.6 kHz) and the jitter period is set at 4ms.

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. ICE3RBR4765JZ provides all the necessary protections to ensure the system is operating safely. The protections include Vcc overvoltage, overtemperature, overload, open loop, Vcc undervoltage, short optocoupler, etc. When those faults are found, the system will go into auto restart which means the system will stop for a short period of time and restart again. If the fault persists, the system will stop again. It is then until the fault is removed, the system resumes to normal operation. A list of protections and the failure conditions are showed in the below table.


Circuit description


Protection function Failure condition Protection Mode

Vcc Overvoltage 1. Vcc > 20.5V & FB > 4.0V & during soft start period 2. Vcc > 25.5V

Auto Restart

Overtemperature (controller junction)

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


Circuit diagram


6 Circuit diagram

Figure 2 – 12W 12V ICE3RBR4765JZ power supply schematic


PCB layout


N.B. : In order to get the optimized performance of the CoolSET™, the grounding of the PCB layout must be connected very carefully. From the circuit diagram above, it indicates that the grounding for the CoolSET™can be split into several groups; signal ground, Vcc ground, Current sense resistor ground and EMI return ground. All the split grounds should be connected to the bulk capacitor ground separately.

Signal ground includes all small signal grounds connecting to the CoolSET™GND pin such as filter capacitor ground, C17, C18, C19 and opto-coupler ground.

Vcc ground includes the Vcc capacitor ground, C16 and the auxiliary winding ground, pin 2 of the power transformer.

Current Sense resistor ground includes current sense resistor R14 and R15.

EMI return ground includes Y capacitor, C12.

7 PCB layout

7.1 Top side

Figure 3 – Top side component legend

7.2 Bottom side

Figure 4 – Bottom side copper and component legend


Component list


8 Component list

No. Designator Component Description Footprint Part Number Manufacturer Quantity

1 +12V 12V Test Point Connector 5005 1

2 BR1 600V/1A 1V S1VBA60 SHINDENGEN 1

3 C11 100nF/305V MKT5/18/15 B329221C3104+*** EPCOS 1

4 C12 2.2nF 250V MKT2/13/10 DE1E3KX222MA4BL01 MURATA 1

5 C13 33uF/450V RB16X25 450BXC33MEFC16X25 RUBYCON 1

6 C15 2.2nF/630V 1206 GRM31A7U2J222JW31D MURATA 1

7 C16 22uF/50V RB5.5 50PX22MEFC5X11 RUBYCON 1

8 C17 100nF/63V 0603 1

9 C18 1nF/63V 0603 1

10 C19 47nF/63V 0603 1

11 C22 1000uF 16V RB10.5 B41889A4108M EPCOS 1

12 C24 330uF 25V RB8 25ZL330MEFC8X16 RUBYCON 1

13 C25 220nF 63V 0603 1

14 C26 1nF 63V 0603 1

15 Com Com Test Point Connector 5006 1

16 D11 600V/0.8A DIODE0.4 D1NK60 SHINDENGEN 1

17 D12 150V/0.5A 1206D 1

18 D21 100V/20A TO-220/3 1

19 F1 250V/1A MKT4.3/8.4/5 1

20 L21 Ferrite bead Axial 0.4_V_FB

Fair-Rite(2743002111) 1

21 HS1 TO220 heat sink HS TO220 576802B00000G 1

22 IC11 ICE3RBR4765JZ DIP7 ICE3RBR4765JZ INFINEON 1

23 IC12 SFH617 A3 DIP4 1

24 IC21 TL431 TO92-TL431- 1

25 L N Connector Connector 1

26 L11 39mH/0.6A EMI_C_U21 B82731M2601A030 EPCOS 1

27 R11 150k/1W 1218 1

28 R12 18R 0603 1

30 R14,R15 2R7/0.25W/1% 1206 2

31 R22 820R 0603 1

32 R23 1.2k 0603 1

33 R24 68k 0603 1

34 R25 75k AXIAL0.3 1

35 R26 20k 0603 1

36 R27 1k 0603 1

37 TR1 882µH(66:11:16) TR_EF20_H 750341844, Rev00 Wurth Electronics Midcom

1


Transformer construction


9 Transformer construction

Core and material: EE20/10/6(EF20), TP4A (TDG) Bobbin: 070-4989(10-Pin, THT, Horizontal version) Primary Inductance, Lp=882μH (±10%), measured between pin 4 and pin 5 Manufacturer and part number: Wurth Electronics Midcom (750341844, Rev00)

Transformer specifications:

Figure 5 – Transformer structure


Test results


10 Test results

10.1 Efficiency

Figure 6 – Efficiency Vs. AC line input voltage

Figure 7 – Efficiency Vs. output power @ 115Vac and 230Vac


Test results


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 Vs. AC line input voltage ( measured by Yokogawa WT210 power meter - integration mode )


Test results


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


Test results


10.5 Maximum input power

Figure 12 – Maximum input power ( before overload protection ) vs. AC line input voltage

10.6 Electrostatic discharge/ESD test (EN6100-4-2)

Pass (Special level (12kV) for contact discharge)

10.7 Surge/Lightning strike test (EN61000-4-5)

Pass (Installation class 3, 2kV for line to earth)

Pass (Installation class 4, 4kV for line to earth with surge absorber device; SA1 & SA2 (SSA601M))


Test results


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 (12W) with input voltage of 115Vac and 230Vac.

Figure 13 – Maximum load (12W) with 115 Vac (Line)

Figure 14 – Maximum load (12W) with 115 Vac (Neutral)


Test results


Figure 15 – Maximum load (12W) with 230 Vac (Line)

Figure 16 – Maximum load (12W) with 230 Vac (Neutral)

Pass conducted emissions EN55022 (CISPR 22) class B with > 10dB margin.


Waveforms and scope plots


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

Channel 1; C1 : Drain voltage (VDrain)

Channel 2; C2 : Supply voltage (VCC)

Channel 3; C3 : Feedback voltage (VFB)

Channel 4; C4 : BA voltage (VBA)

Channel 1; C1 : Drain voltage (VDrain)




Startup time = 502ms Startup time = 502ms

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

Channel 1; C1 : Current sense voltage (VCS)








Soft Start time = 18ms Soft Start time = 18ms

Figure 19 – Soft Start @ 85Vac & max. load Figure 20– Soft Start @ 265Vac & max. load

18ms

502ms 502ms

18ms




11.3 Frequency jittering

Channel 1; C1 : Drain to source voltage (VDS)

Channel F2 : Frequency track of C1

Channel 1; C1 : Drain to source voltage (VDS)

Channel F2 : Frequency track of C1

Frequency jittering from 66 kHz ~ 71kHz, Jitter period is 3.8ms

Frequency jittering from 66 kHz ~ 71kHz, Jitter period is 3.8ms

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 )

Channel 1; C1 : Drain Voltage ( VD ) Channel 2; C2 : Drain Current ( ID )

Duty cycle = 43%, VDS_peak=234V Duty cycle = 10% VDS_peak=523V

Figure 23 – Operation @ Vin = 85Vac and max. load

Figure 24 – Operation @ Vin = 265Vac and max. load

3.8ms

66kHz

71kHz

66kHz

71kHz

3.8ms




11.5 Load transient response (Dynamic load from 10% to 100%)

Channel 1; C1 : Output ripple Voltage ( Vo ) Channel 2; C2 : Output Current ( Io )

Channel 1; C1 : Output ripple Voltage ( Vo ) Channel 2; C2 : Output Current ( Io )

Vripple_pk_pk=129mV (Load change from10% to 100%,100Hz,0.4A/μS slew rate) Probe terminal end with decoupling capacitor of 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter

Vripple_pk_pk=129mV (Load change from10% to 100%,100Hz,0.4A/μS slew rate) Probe terminal end with decoupling capacitor of 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter

Figure 25 – Load transient response @ 85Vac Figure 26 – Load transient response @ 265Vac

11.6 Output ripple voltage at maximum load

Channel 1; C1 : Output ripple Voltage ( Vo ) Channel 1; C1 : Output ripple Voltage ( Vo )

Vripple_pk_pk=24mV

Probe terminal end with decoupling capacitor of 0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter

Vripple_pk_pk=25.6mV


Figure 27 – AC output ripple @ Vin=85Vac and max. load

Figure 28 – AC output ripple @ Vin=265Vac and max. load




11.7 Output ripple voltage during burst mode at 1 W load

Channel 1; C1 : Output ripple Voltage ( Vo ) Channel 1; C1 : Output ripple Voltage ( Vo )

Vripple_pk_pk=44mV


Vripple_pk_pk = 50mV


Figure 29 – AC output ripple @ 85Vac and 1W load

Figure 30 – AC output ripple @ 265Vac and 1W load

11.8 Entering active burst mode









Blanking time to enter burst mode : 18ms (load step down from 1A to 0.0625A)

Blanking time to enter burst mode : 18ms (load step down from 1A to 0.0625A)

Figure 31 – Active burst mode @ 85Vac Figure 32 – Active burst mode @ Vin=265Vac




11.9 Vcc overvoltage protection









VCC OVP2 first & follows VCC OVP1 (R25 disconnected during system operating at no load)

VCC OVP2 first & follows VCC OVP1 (R25 disconnected during system operating at no load)

Figure 33 – Vcc overvoltage protection @ 85Vac Figure 34 – Vcc overvoltage protection @ 265Vac

11.10 Over load protection (built-in + extended blanking time)









Over load protection with 28ms(18+10) blanking time (output load change from 1A to 1.5A)

Over load protection with 28ms(18+10) blanking time (output load change from 1A to 1.5A)

Figure 35 – Over load protection with built-in+extended blanking time @ 85Vac

Figure 36 – Over load protection with built-in+extended blanking time @ 265Vac

VCC OVP2 VCC OVP2 VCC OVP1 VCC OVP1




11.11 Open loop protection









Open loop protection (R25 disconnected during system operation at max. load) – over load protection

Open loop protection (R25 disconnected during system operation at max. load) – over load protection

Figure 37 – Open loop protection @ 85Vac Figure 38 – Open loop protection @ 265Vac

11.12 VCC under voltage/Short optocoupler protection









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


References


11.13 Auto restart enable









External autorestart 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

12 References

[1] Infineon Technologies, Datasheet “CoolSET™-F3R ICE3RBR4765JZ Off-Line SMPS Current Mode Controller with Integrated 650V CoolMOS™ and Startup cell ( frequency jitter Mode ) in Dip-7”

[2] Kyaw Zin Min, Kok Siu Kam Eric, Infineon Technologies, Application Note “CoolSET™-F3R (DIP-8, DIP-7 & DSO-16/12) new Jitter version Design Guide”

[3] Harald Zoellinger, Rainer Kling, Infineon Technologies, Application Note “AN-SMPS-ICE2xXXX-1, CoolSET™. ICE2xXXXX for Off-Line Switching Mode Power supply (SMPS )”

Enter autorestart Exit autorestart

Enter autorestart Exit autorestart

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Published by Infineon Technologies AG

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