10W 12V SMPS Evaluation board using ICE3BR4765JG

Application Note, V1.1, Aug 2011
AN-EVAL3BR4765JG
10W 12V SMPS Evaluation Board with
CoolSET® F3R ICE3BR4765JG
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
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or other persons may be endangered.
10W 12V Demo board using ICE3BR4765JG
Revision History:
Previous Version:
Page
7
2011-08
V1.0
Subjects (major changes since last revision)
V1.1
ZD clamper circuit
10W 12V SMPS Evaluation Board with CoolSET® F3R ICE3BR4765JG:
License to Infineon Technologies Asia Pacific Pte Ltd
Kyaw Zin Min
Kok Siu Kam Eric
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AN-PS0048
10W 12V Demo board using ICE3BR4765JG
Table of Contents
Page
1 Abstract .......................................................................................................................................... 5 2 Evaluation board ........................................................................................................................... 5 3 List of features .............................................................................................................................. 6 4 Technical specifications............................................................................................................... 6 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.11 5.12 5.13 Circuit description ........................................................................................................................ 7 Introduction...................................................................................................................................... 7 Line input ......................................................................................................................................... 7 Start up ............................................................................................................................................ 7 Operation mode .............................................................................................................................. 7 Soft start .......................................................................................................................................... 7 ZD clamper circuit ........................................................................................................................... 7 Peak current control of primary current........................................................................................... 7 Output stage .................................................................................................................................... 8 Feedback and regulation................................................................................................................. 8 Blanking window for load jump........................................................................................................ 8 Active burst mode ........................................................................................................................... 8 Jitter mode....................................................................................................................................... 8 Protection modes ............................................................................................................................ 9 6 Circuit diagram ............................................................................................................................ 10 7 7.1 7.2 PCB layout ................................................................................................................................... 12 Top side......................................................................................................................................... 12 Bottom side ................................................................................................................................... 12 8 Component list ............................................................................................................................ 13 9 Transformer construction .......................................................................................................... 14 10 10.1 10.2 10.3 10.4 10.5 10.6 10.7 10.8 Test results .................................................................................................................................. 15 Efficiency ....................................................................................................................................... 15 Input standby power ...................................................................................................................... 16 Line regulation ............................................................................................................................... 17 Load regulation ............................................................................................................................. 17 Maximum input power ................................................................................................................... 18 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 11.14 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 ............................................................................................................ 25 Over load protection (built-in 20ms blanking time)........................................................................ 25 Over load protection (built-in + extended blanking time) .............................................................. 26 Open loop protection ..................................................................................................................... 26 VCC under voltage/Short optocoupler protection ........................................................................... 27 Auto restart enable ........................................................................................................................ 27 12 12.1 Appendix ...................................................................................................................................... 28 Slope compensation for CCM operation ....................................................................................... 28 13 References ................................................................................................................................... 28 Application Note
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1
Abstract
This document is an engineering report of a universal input 12V 10W off-line flyback converter power supply
utilizing IFX F3R CoolSET® ICE3BR4765JG. 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 ICE3BR4765JG is the latest
version of the CoolSET®. Besides having the basic features of the F3 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 – EVAL3BR4765JG
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
650V avalanche rugged CoolMOS® with built-in Startup Cell
DSO-16/12 SMD package with wide creepage distance
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
50Hz, 60Hz
Input Standby Power
< 50mW @ no load; < 0.7W @ 0.5W load
Output voltage and current
12V +/- 2%
Output current
0.84A
Output power
10W
Efficiency
>83% at full load
Output ripple voltage
< 120mVp-p
Application Note
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5
Circuit description
5.1
Introduction
The EVAL3BR4765JG demo board is a low cost off line flyback switch mode power supply ( SMPS ) using
the ICE3BR4765JG integrated power IC from the CoolSET® -F3R family. The circuit, shown in Figure 2,
details a 12V, 10W 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, X2-capacitors
C11 and Y1-capacitor C15 act as EMI suppressors. Optional spark gap device SG1, SG2 and varistor VAR
can absorb high voltage stress during lightning surge test. After the bridge rectifier BR1 and the input bulk
capacitor C13, a voltage of 100 to 375 VDC is present which depends on input voltage.
5.3
Start up
Since there is a built-in startup cell in the ICE3BR4765JG, 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
ICE3BR4765JG, 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 R13 is used for current limiting. In order not to exceed the maximum
voltage at Vcc pin, an external zener diode ZD11 and resistor R14 can be added.
5.5
Soft start
The Soft-Start is a built-in function and is set at 20ms.
5.6
ZD clamper circuit
While turns off the CoolMOS®, the clamper circuit ZD12 and D11 absorbs the current caused by transformer
leakage inductance once the voltage exceeds clamp capacitor voltage. Finally drain to 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 R15 and R16 which determine the
tolerance of the current limit control. Since ICE3BR4765JG 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 +/-0.61% (refer to Figure 12).
Application Note
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5.8
Output stage
On the secondary side the power is coupled out by a schottky diode D21. The capacitor C21 provides energy
buffering following with the LC filter L21 and C23 to reduce the output voltage ripple considerably. Storage
capacitor C21 is selected to have an internal resistance as small as possible (ESR) to minimize the output
voltage ripple. The optional common mode choke L22 and ceramic capacitor C24 are added to suppress the
high voltage electrostatic static charge during ESD test.
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 C26, C27, 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 R21 and R22. Optocoupler
IC12 is used for floating transmission of the control signal to the “Feedback” input via capacitor C19 of the
ICE3BR4765JG 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, C18 can be added to BA pin to extend it. The extended time can be achieved by an
internal 13uA constant current at BA pin to charge C18 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 4V 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, R15 and
R16.
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 1.35V, the system will only enter Active Burst Mode after 20ms blanking
time while VFB is still below 1.35V.
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 1V 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 0.45mA. At burst mode, the FB voltage is
changing like a saw tooth between 3.0 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 ICE3B4765JG has frequency jittering feature to reduce the EMI noise. The jitter frequency is internally
set at 65kHz (+/-2.6kHz) and the jitter period is set at 4ms.
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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. ICE3BR4765JG provides all the necessary protections to ensure the
system is operating safely. The protections include Vcc overvoltage, overtemperature, overload, open loop,
Vcc undervoltage, short optocoupler, etc. When those faults are found, the system will go into auto restart
which means the system will stop for a short period of time and restart again. If the fault persists, the system
will stop again. It is then until the fault is removed, the system resumes to normal operation. A list of
protections and the failure conditions are showed in the below table.
Protection function
Failure condition
Vcc Overvoltage
1. Vcc > 20.5V & FB > 4.0V & during soft start period
2. Vcc > 25.5V
Auto Restart
Overtemperature
(controller junction)
TJ > 130°C
Auto Restart
Overload / Open loop
VFB > 4.0V and VBA > 4.0V
(Blanking time counted from charging VBA from 0.9V to
4.0V )
Auto Restart
Vcc Undervoltage / Short
Optocoupler
Vcc < 10.5V
Auto Restart
Auto-restart enable
VBA < 0.33V
Auto Restart
Application Note
Protection Mode
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6
Circuit diagram
Figure 2 – 10W 12V ICE3BR4765JG power supply schematic
Application Note
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10W 12V Demo board using ICE3BR4765JG
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 4 of the
power transformer.

Current Sense resistor ground includes current sense resistor R15 and R16.

EMI return ground includes Y capacitor, C15.
Application Note
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7
PCB layout
7.1
Top side
Figure 3 – Top side component legend
7.2
Bottom side
Figure 4 – Bottom side copper & component legend
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8
Component list
No
Designator
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
BR1
C11
C13
C15
C16
C17
C18
C19
C21
C23
C26
C27
D11
D12
D21
F1
IC11
IC12
IC21
J1,J2,J3,J4,J5,L22
L11
L21
R13
R15
R21
R22
R23
R24
R25
R26
31
TR1
32
ZD12
Application Note
Component
description
DF06MA(600V,1A)
0.1uF/305V(X1 cap)
33uF/400V
2.2nF/250V(Y1 cap)
22uF/35V
0.1uF
100pF/50V
1nF/50V
1000uF/25V
220uF/25V
150nF/50V
1.5nF/50V(SMD0805)
UF4005(600V,1A)
1N485B(200V,0.2A)
SB3H100(100V,3A)
1A
ICE3BR4765JG
SFH617A-3
TL431
Jumper
2 x 39mH, 0.6A
1.5uH
240R(SMD 0805)
1.8R(0.5W,1%)
470R
1.2K(SMD 0805)
51k(SMD 0805)
56k
1k
15k
1300uH(80:12:14)
EF20/10/6, N87
1N5384B(160V)
Part No.
Manufacturer
DE1E3KX222MA4BL01
B41821A6106M000
RPER71H104K2K1A03B
MURATA
EPCOS
MURATA
KZE series or equivalent
KZE series or equivalent
UF4005
VISHAY
SB3H100-E3/54
VISHAY
ICE3BR4765JG
INFINEON
B82731M2601A030
EPCOS
B662061110T001
EPCOS
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9
Transformer construction
Core: EF20/10/6, N87
Bobbin: Horizontal Version
Primary Inductance, Lp: 1300µH (+/-2%) measured between pin 1 and pin 2 (Gapped to Inductance)
Transformer structure:
1
9
3
2
10
4
5
Figure 5 – Transformer structure and top view of transformer complete
Wire size requirement:
Application Note
Start
4
Stop
5
No. of turns
14
Wire size
1XAWG#30
3
2
40
1XAWG#30
1
10
9
12
1XAWG#26
Secondary
1
3
40
1XAWG#30
1
14
Layer
Auxiliary
/2 Primary
/2 Primary
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Test results
10.1
Efficiency
Active-Mode Efficiency versus AC Line Input Voltage
87.00
Efficiency [ % ]
85.49
85.25
86.00
85.00
84.35
85.19
85.19
84.98
85.47
85.06
83.79
84.56
84.00
84.10
83.00
83.18
82.00
85
115
150
180
230
265
AC Line Input Voltage [ Vac ]
Full load Efficiency
Average Efficiency(25%,50%,75% & 100%)
Figure 6 – Efficiency Vs. AC line input voltage
Efficiency versus Output Power
90.00
Efficiency [ % ]
85.9
85.5
85.0
85.2
84.3
84.9
84.6
50
75
85.00
80.0
82.0
80.00
78.0
75.00
70.00
0
25
100
Output Power [ % ]
Vin=115Vac
Vin=230Vac
Figure 7 – Efficiency Vs. output power @ low and high Line
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10.2
Input standby power
Standby Power versus AC Line Input Voltage
Input Power [ mW ]
50.0
37.99
40.0
35.43
32.07
28.57
33.15
29.88
30.0
20.0
85
115
150
180
230
265
AC Line Input Voltage [ Vac ]
Po = 0W
Figure 8 – Input standby power @ no load Vs. AC line input voltage ( measured by Yokogawa WT210
power meter - integration mode )
Standby Power versus AC Line Input Voltage
Input Power [ W ]
2.0
1.5
1.21
1.21
1.20
0.63
0.63
0.63
1.25
1.22
1.0
0.65
0.64
1.27
0.67
0.5
0.0
85
115
150
180
230
265
AC Line Input Voltage [ Vac ]
Po=0.5W
Po=1W
Figure 9 – Input standby power @ 0.5W & 1W Vs. AC line input voltage ( measured by Yokogawa
WT210 power meter - integration mode )
Application Note
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10.3
Line regulation
Output Voltage [ V ]
Line Regulation : Output Voltage @ Max. Load versus AC Line Input Voltage
12.1600
12.0600
12.17
12.17
85
115
12.17
12.17
150
180
12.17
12.17
230
265
11.9600
11.8600
11.7600
AC Line Input Voltage [ Vac ]
Vo @ max. load
Figure 10 – Line regulation Vout @ full load vs. AC line input voltage
10.4
Load regulation
Load Regulation: Vout versus Outoput Power
Ouput Voltage [ V ]
12.19
12.16
12.19
12.19
12.18
12.19
12.18
12.18
12.18
12.17
12.17
12.06
11.96
11.86
11.76
0
25
50
75
100
Output Power [ % ]
Output Voltage @ 230Vac
Output Voltage @ 115Vac
Figure 11 – Load regulation Vout vs. output power
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10.5
Maximum input power
Max. Overload Input Pow er ( Peak Pow er ) versus AC Line Input Voltage
Max. Overload input Power [ W ]
Pin=14.71±0.61%
17
16
14.8
15
14.69
14.62
14.62
14.68
150
180
230
14.79
14
13
85
115
265
AC Line Input Voltage [ Vac ]
Peak Input Power
Figure 12 – Maximum input power ( before overload protection ) vs. AC line input voltage
10.6
ESD test
Pass* (EN61000-4-2) : 12kV for contact discharge
*Add L22 and C24
10.7
Lightning surge test
Pass* (EN61000-4-5) : 6kV for line to earth
*Add SG1 & SG2(DA38-102MB)
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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 (10W) with input voltage of 115Vac and
230Vac.
80
EN_V_QP
EN_V_AV
QP Pre
AV Pre
70
60
dBµV
50
40
30
20
10
0
-10
0.1
1
10
100
f / MHz
Figure 13 – Maximum load (10W) with 115 Vac (Line)
80
EN_V_QP
EN_V_AV
QP
AV
70
60
dBµV
50
40
30
20
10
0
-10
0.1
1
10
100
f / MHz
Figure 14 – Maximum load (10W) with 115 Vac (Neutral)
Application Note
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80
EN_V_QP
EN_V_AV
QP
AV
70
60
dBµV
50
40
30
20
10
0
0.1
1
10
100
f / MHz
Figure 15 – Maximum load (10W) with 230 Vac (Line)
80
EN_V_QP
EN_V_AV
QP
AV
70
60
dBµV
50
40
30
20
10
0
0.1
1
10
100
f / MHz
Figure 16 – Maximum load (10W) with 230 Vac (Neutral)
Pass conducted EMI EN55022 (CISPR 22) class B with > 8dB margin.
Application Note
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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
550ms
550ms
Channel 1; C1 : Drain voltage (VDrain)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BBA voltage (VBA)
Channel 1; C1 : Drain voltage (VDrain)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BBA voltage (VBA)
Startup time = 550ms
Startup time = 550ms
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
19.5ms
19.5ms
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BBA voltage (VBA)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BBA voltage (VBA)
Soft Star time = 19.5ms(32 steps)
Soft Star time = 19.5ms(32 steps)
Figure 19 – Soft Start @ 85Vac & max. load
Figure 20– Soft Start @ 265Vac & max. load
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11.3
Frequency jittering
66.1kHz
66.1kHz
4ms
4ms
61.3kHz
61.3kHz
Channel 2; C2 : Drain to source voltage (VDS)
Channel 2; C2 : Drain to source voltage (VDS)
Frequency jittering from 61.3 kHz ~ 66.1kHz, Jitter
period is approximately 4ms(2msX2)
Frequency jittering from 61.3kHz ~ 66.1kHz, Jitter
period is approximately 4ms(2msX2)
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 Current ( IDS )
Channel 2; C2 : Drain Source Voltage ( VDS )
Duty cycle = 37.5%, VDS_peak=294.5V
Figure 23 – Operation @ Vin = 85Vac and max.
load
Application Note
Channel 1; C1 : Drain Current ( IDS )
Channel 2; C2 : Drain Source Voltage ( VDS )
Duty cycle = 12.5% VDS_peak=567V
Figure 24 – Operation @ Vin = 265Vac and max.
load
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10W 12V Demo board using ICE3BR4765JG
11.5 Load transient response ( Dynamic load from 10% to 100%)
Channel 1; C1 : Output Current ( Io )
Channel 2; C2 : Output ripple Voltage ( Vo )
Vripple_pk_pk=108.5mV (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 Current ( Io )
Channel 2; C2 : Output ripple Voltage ( Vo )
Vripple_pk_pk=107.6mV (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 2; C2 : Output Ripple Voltage ( Vo_ripple )
Channel 2; C2 : Output Ripple Voltage ( Vo_ripple )
Vripple_pk_pk=12mV
Probe terminal end with decoupling capacitor of
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
Figure 27 – AC output ripple @ Vin=85Vac and
12W load
Vripple_pk_pk=12mV
Probe terminal end with decoupling capacitor of
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
Figure 28 – AC output ripple @ Vin=265Vac and
12W load
Application Note
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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=33.8mV
Vripple_pk_pk = 35.1mV
Probe terminal end with decoupling capacitor
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
of
Figure 29 – AC output ripple @ 85Vac and 1W load
11.8
Probe terminal end with decoupling capacitor of
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
Figure 30 – AC output ripple @ 265Vac and 1W
load
Entering active burst mode
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BBA voltage (VBA)
Blanking time to enter burst mode : 19ms (load step
down from 0.084A to 0.042A)
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 : BBA voltage (VBA)
Blanking time to enter burst mode : 19ms (load
step down from 0.084A to 0.042A)
Figure 32 – Active burst mode @ Vin=265Vac
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11.9
Vcc overvoltage protection
VCC OVP2
VCC OVP1
VCC OVP2
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BBA voltage (VBA)
VCC OVP2 first & follows VCC OVP1 (R24
disconnected before system start up with no load)
Figure 33 – Vcc overvoltage protection @ 85Vac
11.10
VCC OVP1
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BBA voltage (VBA)
VCC OVP2 first & follows VCC OVP1 (R24
disconnected before system start up with no load)
Figure 34 – Vcc overvoltage protection @ 265Vac
Over load protection (built-in 20ms 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 (built-in 20ms) blanking
time (output load change from 0.84A to 1.2A,
C18=100pF)
Figure 35 – Over load protection with built-in 20ms
blanking time @ 85Vac)
Application Note
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA voltage (VBA)
Over load protection with (built-in 20ms) blanking
time (output load change from 0.84A to 1.2A,
C18=100pF)
Figure 36 – Over load protection with built-in 20ms
blanking time @ 265Vac)
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11.11
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 (built-in 20ms+extended)
blanking time (output load change from 0.84A to
1.2A, C18=100nF)
Figure 37 – Over load protection with built-in
20ms+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 : BA voltage (VBA)
Over load protection with (built-in 20ms+extended)
blanking time (output load change from 0.84A to
1.2A, C18=100nF)
Figure 38 – Over load protection with built-in
20ms+extended) blanking time @ 265Vac)
11.12 Open loop protection
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)
Open loop protection (R24 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 : BA voltage (VBA)
Open loop protection (R24 disconnected during
system operation at max. load) – over load
protection
Figure 39 – Open loop protection @ 85Vac
Figure 40 – Open loop protection @ 265Vac
Application Note
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10W 12V Demo board using ICE3BR4765JG
11.13 VCC under voltage/Short optocoupler protection
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)
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 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
11.14 Auto restart enable
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BBA voltage (VBA)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BBA voltage (VBA)
External protection enable (short BA pin to Gnd by
10Ω resistor)
External protection enable (short BA pin to Gnd by
10Ω resistor)
Figure 43 – External protection enable @ 85Vac
Figure 44– External protection enable @ 265Vac
Application Note
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10W 12V Demo board using ICE3BR4765JG
12
Appendix
12.1
Slope compensation for CCM operation
This demo board is designed in Discontinuous Conduction Mode ( DCM ) operation. If the application is
designed in Continuous Conduction Mode ( CCM ) operation where the maximum duty cycle exceeds the
50% threshold, it needs to add the slope compensation network. Otherwise, the circuitry will be unstable. In
this case, three more components ( 2 ceramic capacitors C17 / C18 and one resistor R19) is needed to add
as shown in the circuit diagram below.
Figure 45 – Circuit diagram switch mode power supply with slope compensation
More information regarding how to calculate the additional components, see application note
AN_SMPS_ICE2xXXX – available on the internet: www.infineon.com (directory : Home > Power
Semiconductors > Integrated Power ICs > CoolSET®F2)
13
References
[1]
Infineon Technologies, Datasheet “CoolSET® -F3R ICE3BR4765JG Off-Line SMPS Current Mode
Controller with Integrated 650V CoolMOS® and Startup cell ( frequency jitter Mode ) in DSO-16”
[2]
Eric Kok Siu Kam, Kyaw Zin Min, Infineon Technologies, Application Note “ICE3ARxx65J
/ICE3BRxx65J CoolSET® F3R 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
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