12W 12V SMPS Evaluation Board with ICE3RBR4765JZ

CoolS ET ™ F3R Famil y
ICE3RBR4765JZ
12V 12W SMPS e va l uat ion boar d
wit h I CE3RB R4765J Z
ANPS0078
Appl icat ion Not e AN - EVAL- 3RB R4765JZ
V1.1, 2013-07-15
Po wer Manag em ent & Mult im ar k et
Edition 2013-07-15
Published by Infineon Technologies AG,
81726 Munich, Germany.
© 2013 Infineon Technologies AG
All Rights Reserved.
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(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
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12V 12W SMPS evaluation board with ICE3RBR4765JZ
ANPS0078
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
Application Note AN-EVAL-3RBR4765JZ
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ANPS0078
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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Application Note AN-EVAL-3RBR4765JZ
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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
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.11
5.12
5.13
Circuit description ....................................................................................................................... 9
Introduction .................................................................................................................................... 9
Line input ....................................................................................................................................... 9
Start up .......................................................................................................................................... 9
Operation mode ............................................................................................................................. 9
Soft start ........................................................................................................................................ 9
RCD clamper circuit ....................................................................................................................... 9
Peak current control of primary current ........................................................................................... 9
Output stage .................................................................................................................................. 9
Feedback and regulation .............................................................................................................. 10
Blanking window for load jump ..................................................................................................... 10
Active burst mode ........................................................................................................................ 10
Jitter mode ................................................................................................................................... 10
Protection modes ......................................................................................................................... 10
6
Circuit diagram........................................................................................................................... 12
7
7.1
7.2
PCB layout.................................................................................................................................. 13
Top side ....................................................................................................................................... 13
Bottom side .................................................................................................................................. 13
8
Component list ........................................................................................................................... 14
9
Transformer construction .......................................................................................................... 15
10
10.1
10.2
10.3
10.4
10.5
10.6
10.7
10.8
Test results................................................................................................................................. 16
Efficiency ..................................................................................................................................... 16
Input standby power ..................................................................................................................... 17
Line regulation ............................................................................................................................. 18
Load regulation ............................................................................................................................ 18
Maximum input power .................................................................................................................. 19
Electrostatic discharge/ESD test (EN6100-4-2)............................................................................. 19
Surge/Lightning strike test (EN61000-4-5) .................................................................................... 19
Conducted emissions (EN55022 class-B) ..................................................................................... 20
11
11.1
11.2
11.3
11.4
11.5
11.6
Waveforms and scope plots ...................................................................................................... 22
Start up at low and high AC line input voltage and maximum load................................................. 22
Soft start at low and high AC line input voltage and maximum load ............................................... 22
Frequency jittering........................................................................................................................ 23
Drain voltage and current @ maximum load ................................................................................. 23
Load transient response (Dynamic load from 10% to 100%) ......................................................... 24
Output ripple voltage at maximum load......................................................................................... 24
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11.7
11.8
11.9
11.10
11.11
11.12
11.13
Output ripple voltage during burst mode at 1 W load..................................................................... 25
Entering active burst mode ........................................................................................................... 25
Vcc overvoltage protection ........................................................................................................... 26
Over load protection (built-in + extended blanking time) ................................................................ 26
Open loop protection .................................................................................................................... 27
VCC under voltage/Short optocoupler protection ............................................................................ 27
Auto restart enable ....................................................................................................................... 28
12
References ................................................................................................................................. 28
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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.
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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
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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 cycleby-cycle primary current and feedback voltage control and can make sure the maximum power of the converter
is controlled in every switching cycle. Besides, the patented propagation delay compensation is implemented to
ensure the maximum input power can be controlled in an even tighter manner throughout the wide range input
voltage. The demo board shows approximately +/-0.5% (refer to Figure 12).
5.8
Output stage
On the secondary side the power is coupled out by a schottky diode D21. The capacitor C22 provides energy
buffering following with the LC filter L21 and C24 to reduce the output voltage ripple considerably. Storage
capacitor C22 is selected to have an internal resistance as small as possible (ESR) to minimize the output
voltage ripple.
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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 ( CBK =47nF) from 0.9V to 4.0V. Thus the overall blanking time is the
addition of 20ms and the extended time. The voltage at Feedback pin can rise above 4.3V without switching off
due to over load protection within this blanking time frame. During the operation the transferred power is limited
to the maximum peak current defined by the value of the current sense resistor, R14 and R15.
Tblanking  Basic  Extended  20ms 
5.11
(4.00.9)*CBK
 20ms  238461.5 * CBK  31.2ms
IBK
Active burst mode
At light load condition, the SMPS enters into Active Burst Mode. At this start, the controller is always active and
thus the VCC must always be kept above the switch off threshold VCCoff ≥ 10.5V. During active burst mode, the
efficiency increases significantly and at the same time it supports low ripple on VOUT and fast response on load
jump. When the voltage level at FB falls below 1.35V, the internal blanking timer starts to count. When it
reaches the built-in 20ms blanking time, it will enter Active Burst Mode. The Blanking Window is generated to
avoid sudden entering of Burst Mode due to load jump.
During Active Burst Mode the current sense voltage limit is reduced from 1.03V to 0.34V so as to reduce the
conduction losses and audible noise. All the internal circuits are switched off except the reference and bias
voltages to reduce the total VCC current consumption to below 450µA. At burst mode, the FB voltage is changing
like a saw tooth between 3 and 3.5V. To leave Burst Mode, FB voltage must exceed 4V. It will reset the Active
Burst Mode and turn the SMPS into Normal Operating Mode. Maximum current can then be provided to stabilize
VOUT.
5.12
Jitter mode
The 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.
Application Note AN-EVAL-3RBR4765JZ
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Circuit description
Protection function
Failure condition
Vcc Overvoltage
1. Vcc > 20.5V & FB > 4.0V & during soft start period
2. Vcc > 25.5V
Auto Restart
Overtemperature
(controller junction)
TJ > 130°C
Auto Restart
Overload / Open loop
VFB > 4.0V and VBA > 4.0V
(Blanking time counted from charging VBA from 0.9V to
4.0V )
Auto Restart
Vcc Undervoltage / Short
Optocoupler
Vcc < 10.5V
Auto Restart
Auto-restart enable
VBA < 0.33V
Auto Restart
Application Note AN-EVAL-3RBR4765JZ
Protection Mode
11
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Circuit diagram
6
Circuit diagram
Figure 2 – 12W 12V ICE3RBR4765JZ power supply schematic
Application Note AN-EVAL-3RBR4765JZ
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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
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Component list
8
Component list
Component
Description
No.
Designator
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
+12V
BR1
C11
C12
C13
C15
C16
C17
C18
C19
C22
C24
C25
C26
Com
D11
D12
D21
F1
12V Test Point
600V/1A
100nF/305V
2.2nF 250V
33uF/450V
2.2nF/630V
22uF/50V
100nF/63V
1nF/63V
47nF/63V
1000uF 16V
330uF 25V
220nF 63V
1nF 63V
Com Test Point
600V/0.8A
150V/0.5A
100V/20A
250V/1A
Footprint
Part Number
5005
S1VBA60
B329221C3104+***
DE1E3KX222MA4BL01
450BXC33MEFC16X25
GRM31A7U2J222JW31D
50PX22MEFC5X11
SHINDENGEN
EPCOS
MURATA
RUBYCON
MURATA
RUBYCON
B41889A4108M
25ZL330MEFC8X16
EPCOS
RUBYCON
5006
D1NK60
SHINDENGEN
TO220 heat sink
ICE3RBR4765JZ
SFH617 A3
TL431
Connector
1V
MKT5/18/15
MKT2/13/10
RB16X25
1206
RB5.5
0603
0603
0603
RB10.5
RB8
0603
0603
Connector
DIODE0.4
1206D
TO-220/3
MKT4.3/8.4/5
Axial
0.4_V_FB
HS TO220
DIP7
DIP4
TO92-TL431-
20
L21
Ferrite bead
21
22
23
24
HS1
IC11
IC12
IC21
25
26
27
28
30
31
32
33
34
35
36
37
L N
L11
R11
R12
R14,R15
R22
R23
R24
R25
R26
R27
Connector
39mH/0.6A
150k/1W
18R
2R7/0.25W/1%
820R
1.2k
68k
75k
20k
1k
Connector
EMI_C_U21
1218
0603
1206
0603
0603
0603
AXIAL0.3
0603
0603
TR1
882µH(66:11:16)
TR_EF20_H
Application Note AN-EVAL-3RBR4765JZ
Manufacturer
Quantity
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Fair-Rite(2743002111)
1
576802B00000G
ICE3RBR4765JZ
1
1
1
1
INFINEON
B82731M2601A030
EPCOS
750341844, Rev00
Wurth
Electronics
Midcom
14
1
1
1
1
2
1
1
1
1
1
1
1
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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
Application Note AN-EVAL-3RBR4765JZ
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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
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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 )
Application Note AN-EVAL-3RBR4765JZ
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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
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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))
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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)
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Test results
Figure 15 – Maximum load (12W) with 230 Vac (Line)
Figure 16 – Maximum load (12W) with 230 Vac (Neutral)
Pass conducted emissions EN55022 (CISPR 22) class B with > 10dB margin.
Application Note AN-EVAL-3RBR4765JZ
21
V1.1, 2013-07-15
12V 12W SMPS evaluation board with ICE3RBR4765JZ
ANPS0078
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
502ms
502ms
Channel
Channel
Channel
Channel
1; C1 : Drain voltage (VDrain)
2; C2 : Supply voltage (VCC)
3; C3 : Feedback voltage (VFB)
4; C4 : BA voltage (VBA)
Channel
Channel
Channel
Channel
1; C1 : Drain voltage (VDrain)
2; C2 : Supply voltage (VCC)
3; C3 : Feedback voltage (VFB)
4; C4 : BA voltage (VBA)
Startup time = 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
18ms
Channel
Channel
Channel
Channel
1; C1 : Current sense voltage (VCS)
2; C2 : Supply voltage (VCC)
3; C3 : Feedback voltage (VFB)
4; C4 : BA voltage (VBA)
18ms
Channel
Channel
Channel
Channel
1; C1 : Current sense voltage (VCS)
2; C2 : Supply voltage (VCC)
3; C3 : Feedback voltage (VFB)
4; C4 : BA voltage (VBA)
Soft Start time = 18ms
Soft Start time = 18ms
Figure 19 – Soft Start @ 85Vac & max. load
Figure 20– Soft Start @ 265Vac & max. load
Application Note AN-EVAL-3RBR4765JZ
22
V1.1, 2013-07-15
12V 12W SMPS evaluation board with ICE3RBR4765JZ
ANPS0078
Waveforms and scope plots
11.3
Frequency jittering
71kHz
71kHz
3.8ms
3.8ms
66kHz
66kHz
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 )
Duty cycle = 43%, VDS_peak=234V
Figure 23 – Operation @ Vin = 85Vac and max.
load
Application Note AN-EVAL-3RBR4765JZ
Channel 1; C1 : Drain Voltage ( VD )
Channel 2; C2 : Drain Current ( ID )
Duty cycle = 10% VDS_peak=523V
Figure 24 – Operation @ Vin = 265Vac and max.
load
23
V1.1, 2013-07-15
12V 12W SMPS evaluation board with ICE3RBR4765JZ
ANPS0078
Waveforms and scope plots
11.5
Load transient response (Dynamic load from 10% to 100%)
Channel 1; C1 : Output ripple Voltage ( Vo )
Channel 2; C2 : Output Current ( Io )
Vripple_pk_pk=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
11.6
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
Figure 26 – Load transient response @ 265Vac
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
Figure 27 – AC output ripple @ Vin=85Vac and
max. load
Vripple_pk_pk=25.6mV
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 AN-EVAL-3RBR4765JZ
24
V1.1, 2013-07-15
12V 12W SMPS evaluation board with ICE3RBR4765JZ
ANPS0078
Waveforms and scope plots
11.7
Output ripple voltage during burst mode at 1 W load
Channel 1; C1 : Output ripple Voltage ( Vo )
Vripple_pk_pk=44mV
Probe terminal end with decoupling capacitor of
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
Channel 1; C1 : Output ripple Voltage ( Vo )
Vripple_pk_pk = 50mV
Probe terminal end with decoupling capacitor of
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
Figure 29 – AC output ripple @ 85Vac and 1W
load
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 : BA voltage (VBA)
Blanking time to enter burst mode : 18ms (load step
down from 1A to 0.0625A)
Figure 31 – Active burst mode @ 85Vac
Application Note AN-EVAL-3RBR4765JZ
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA voltage (VBA)
Blanking time to enter burst mode : 18ms (load step
down from 1A to 0.0625A)
Figure 32 – Active burst mode @ Vin=265Vac
25
V1.1, 2013-07-15
12V 12W SMPS evaluation board with ICE3RBR4765JZ
ANPS0078
Waveforms and scope plots
11.9
Vcc overvoltage protection
VCC OVP2
VCC OVP1
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA voltage (VBA)
VCC OVP2 first & follows VCC OVP1 (R25
disconnected during system operating at no load)
Figure 33 – Vcc overvoltage protection @ 85Vac
11.10
VCC OVP2
VCC OVP1
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA voltage (VBA)
VCC OVP2 first & follows VCC OVP1 (R25
disconnected during system operating at no load)
Figure 34 – Vcc overvoltage protection @ 265Vac
Over load protection (built-in + extended blanking time)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA voltage (VBA)
Over load protection with 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
Application Note AN-EVAL-3RBR4765JZ
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA voltage (VBA)
Over load protection with 28ms(18+10) blanking
time (output load change from 1A to 1.5A)
Figure 36 – Over load protection with
built-in+extended blanking time @ 265Vac
26
V1.1, 2013-07-15
12V 12W SMPS evaluation board with ICE3RBR4765JZ
ANPS0078
Waveforms and scope plots
11.11
Channel
Channel
Channel
Channel
Open loop protection
1; C1 : Current sense voltage (VCS)
2; C2 : Supply voltage (VCC)
3; C3 : Feedback voltage (VFB)
4; C4 : BA voltage (VBA)
Channel
Channel
Channel
Channel
1; C1 : Current sense voltage (VCS)
2; C2 : Supply voltage (VCC)
3; C3 : Feedback voltage (VFB)
4; C4 : BA voltage (VBA)
Open loop protection (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
Channel
Channel
Channel
Channel
VCC under voltage/Short optocoupler protection
1; C1 : Current sense voltage (VCS)
2; C2 : Supply voltage (VCC)
3; C3 : Feedback voltage (VFB)
4; C4 : BA voltage (VBA)
Channel
Channel
Channel
Channel
1; C1 : Current sense voltage (VCS)
2; C2 : Supply voltage (VCC)
3; C3 : Feedback voltage (VFB)
4; C4 : BA voltage (VBA)
VCC under voltage/short optocoupler protection
(short the transistor of optocoupler during system
operating @ full load)
VCC under voltage/short optocoupler protection
(short the transistor of optocoupler during system
operating @ full load)
Figure 39 – Vcc under voltage/short optocoupler
protection @ 85Vac
Figure 40 – Vcc under voltage/short optocoupler
protection @ 265Vac
Application Note AN-EVAL-3RBR4765JZ
27
V1.1, 2013-07-15
12V 12W SMPS evaluation board with ICE3RBR4765JZ
ANPS0078
References
11.13
Auto restart enable
Enter autorestart
Channel
Channel
Channel
Channel
Exit autorestart
1; C1 : Current sense voltage (VCS)
2; C2 : Supply voltage (VCC)
3; C3 : Feedback voltage (VFB)
4; C4 : BA voltage (VBA)
Enter autorestart
Channel
Channel
Channel
Channel
Exit autorestart
1; C1 : Current sense voltage (VCS)
2; C2 : Supply voltage (VCC)
3; C3 : Feedback voltage (VFB)
4; C4 : BA voltage (VBA)
External 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 )”
Application Note AN-EVAL-3RBR4765JZ
28
V1.1, 2013-07-15
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Published by Infineon Technologies AG
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