60W 18V Evaluation board using ICE3BR1465JF

Application Note, V1.0, Sep 2011
AN-EVAL3BR1465JF
60W 18V SMPS Evaluation Board with
CoolSET® F3R ICE3BR1465JF
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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and/or protect human life. If they fail, it is reasonable to assume that the health of the user
or other persons may be endangered.
60W 18V Demo board using ICE3BR1465JF
Revision History:
Previous Version:
Page
2011-09
none
Subjects (major changes since last revision)
60W 18V SMPS Evaluation Board with CoolSET® F3R ICE3BR1465JF:
License to Infineon Technologies Asia Pacific Pte Ltd
Kyaw Zin Min
Kok Siu Kam Eric
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V1.0
AN-PS0059
60W 18V Demo board using ICE3BR1465JF
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 RCD 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 that describes a universal input power supply designed in an 18V
60W off line flyback converter that utilizes the IFX F3R CoolSET® ICE3BR1465JF. The application demo
board is operated in discontinuous conduction mode (DCM) and is running at 67 kHz switching frequency. It
has one output voltage with secondary side control regulation. It is especially suitable for AC/DC power
supply such as LCD monitors, adapters for printers and notebook computers, DVD players and recorder,
Blue-Ray DVD player and recorder, set-top boxes and industrial auxiliary power supplies. The
ICE3BR1465JF is a current mode control PWM integrated with CoolMOS®. With the 650V startup cell, active
burst mode and BiCMOS technologies, the standby power can be <100mW at no load and Vin = 265Vac. The
frequency jitter mode and the soft gate drive can give a low EMI performance. The built-in 20ms blanking
window and the extendable blanking time concept can prevent the IC from entering the auto restart mode
due to over load protection unintentionally. The outstanding propagation delay compensation feature can
allow a very precise current limit between low line and high line. The IC provides auto-restart protection
mode for Vcc over-voltage, over temperature, over load, open loop, Vcc under-voltage, short opto-coupler. In
case it needs customer defined protection, the external auto restart enable feature can fulfill the requirement.
2
Evaluation board
Figure 1 – EVAL3BR1465JF
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
Active Burst Mode for lowest Standby Power
Fast load jump response in Active Burst Mode
67 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, 50Hz
Input Standby Power
< 100mW at no load
Output voltage and current
18V +/- 2%
Output current
3.33A
Output power
60W
Efficiency
>83% at average efficiency(25%,50%,75% & 100%load)
Output ripple voltage
< 180mVp-p
Application Note
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Circuit description
5.1
Introduction
The EVAL3BR1465JF demo board is a low cost off line flyback switch mode power supply ( SMPS ) using
the ICE3BR1465JF integrated power IC from the CoolSET® -F3R family. The circuit, shown in Figure 2,
details a 18V, 60W 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, L12,
X-capacitors C11, C14 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 ICE3BR1465JF, 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
ICE3BR1465JF, 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 ICE3BR1465JF 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 +/-2.68% (refer to Figure 12).
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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 C23 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.
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, R27 and R28
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
ICE3BR1465JF 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 13.5µA constant current at BA pin to charge C19 ( CBK =10nF) 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 +
( 4.0 − 0.9) * CBK
= 20ms + 229629.6 * CBK = 22.29ms
IBK
The blanking time to enter the Active Burst Mode is built-in at 20ms with no extension. If a low load condition
is detected when VFB is falling below 1.22V, the system will only enter Active Burst Mode after 20ms blanking
time while VFB is still below 1.22V.
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 1.22V, 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 1.06V to 0.26V 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 0.5mA. At burst mode, the FB voltage is
changing like a saw tooth between 3.1 and 3.6V. To leave Burst Mode, FB voltage must exceed 4.5V. 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 ICE3BR1465JF has frequency jittering feature to reduce the EMI noise. The jitter frequency is internally
set at 67 kHz (+/- 2.7 kHz) and the jitter period is set at 4ms.
Application Note
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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. ICE3BR1465JF 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 > 4.5V & during soft start period
2. Vcc > 25.5V
Auto Restart
Overtemperature
(controller junction)
TJ > 130°C
Auto Restart
Overload / Open loop
VFB > 4.5V 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 – 60W 18V ICE3BR1465JF power supply schematic
Application Note
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60W 18V Demo board using ICE3BR1465JF
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.
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
Application Note
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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
BR1
C11
C12
C13
C14
C15
C16
C17
C18, C26
C19
C22
C23
C25
C110
D11
D12
D21
F1
HS11
HS21
IC11
IC12
IC21
J11,J12,J13,J21,
NTC,R27,L22
L N, +18V Com
L11
L12
L21
R11
R12
R14
R22
R23
R24
R26
R28
TR1
25
26
27
28
29
30
31
32
33
34
35
36
37
Application Note
Component
description
KBU4G(400V 4A)
220nF/305V
2.2nF/250V
120uF/400V
100nF/305V
10nF 630V
22uF 35V
100nF 63V
1nF 63V
10nF 63V
2200uF 25V
1000uF 25V
150nF 63V
100pF 1kV
UF4005(600V 1A)
1N485B(200V 0.2A)
VF30200C(200V 30A)
2A
Heat Sink
Heat Sink
ICE3BR1465JF
SFH617 A3
TL431
Jumper
Connector
39mH 1.4A
6.8mH 1.3A
1.5uH,6.3A
39k 2W
200R
0.33R 1W, 1%
750R
1.2k
100k
10k 1%
62k 1%
220µH(28:6:6)
Part No.
Manufacturer
B32922C3224M000
DE1E3KX222MA4BL01
B43501A9127M000
B32922C3104K000
EPCOS
MURATA
EPCOS
EPCOS
DESD33A101KA2B
MURATA
VF30200C-E3/4W
VISHAY
529902B02500G
533202B02551G
ICE3BR1465JF
AAVID
AAVID
INFINEON
B82734R2142B030
B82734R2322B030
EPCOS
EPCOS
ER28/17/11(N72)
EPCOS
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9
Transformer construction
Core and material : ER28/17/11, N72
Bobbin: ERB28L-P1212-F
Primary Inductance, Lp=220μH(±5%), measured between pin 6 and pin 4 (Gapped to Inductance)
Transformer structure:
Figure 5 – Transformer structure and top view of transformer complete
Wire size requirement:
Start
Application Note
Stop
No. of turns
Wire size
Layer
1
6
8
5
7
14
6
2XAWG#24
4XAWG#24
/2 Primary
Secondary
5
2
4
1
14
6
2XAWG#24
1XAWG#24
1
14
/2 Primary
Auxilary
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Test results
10.1
Efficiency
Active-Mode Efficiency versus AC Line Input Voltage
90.00
89.00
87.62
87.99
87.49
87.94
87.78
230
265
86.64
88.00
Efficiency [ % ]
88.06
87.93
87.00
86.00
86.76
84.62
85.00
85.13
84.00
83.00
81.83
82.00
81.00
80.00
85
115
150
180
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
Efficiency [ % ]
95.00
85.00
88.2
87.6
90.00
87.1
81.5
88.5
87.3
86.5
88.0
85.1
80.00
78.7
75.00
0
25
50
75
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
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
5.0
4.5
Input Power [ W ]
4.0
3.55
3.55
3.54
3.58
3.65
3.69
3.5
3.0
2.39
2.39
1.23
1.23
2.5
2.0
1.5
2.45
2.41
2.40
1.23
1.27
1.24
2.49
1.29
1.0
0.5
0.0
85
115
150
180
230
265
AC Line Input Voltage [ Vac ]
Po=1W
Po=2W
Po=3W
Figure 9 – Input standby power @ 1W, 2W & 3W Vs. AC line input voltage ( measured by Yokogawa
WT210 power meter - integration mode )
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10.3
Line regulation
Output Voltage [ V ]
Line Regulation : Output Voltage @ Max. Load versus AC Line Input Voltage
18.2000
18.1000
18.02
18.02
18.02
18.02
18.02
18.02
85
115
150
180
230
265
18.0000
17.9000
17.8000
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 ]
18.20
18.10
18.05
18.00
18.05
18.04
18.04
18.04
18.04
18.03
18.03
18.02
18.02
17.90
17.80
0
25
50
75
100
Output Power [ % ]
Output Voltage @ 230Vac
Output Voltage @ 115Vac
Figure 11 – Load regulation Vout vs. output power
Application Note
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10.5
Maximum input power
Max. Overload Input Power ( Peak Power ) versus AC Line Input Voltage
Max. Overload input Power [ W ]
Pin=77.76±2.68%(W)
80
79.85
79
78.11
78
76.85
77
76.1
75.68
76
75.8
75
85
115
150
180
230
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): 10kV for contact discharge (without surge absorber device)
Pass (EN61000-4-2): 20kV for contact discharge (with surge absorber device; SA1 & SA2 (DA38-102MB))
10.7
Lightning surge test
Pass (EN61000-4-5): 2kV for line to earth (without surge absorber device)
Pass (EN61000-4-5): 5kV for line to earth (with surge absorber device; SA1 & SA2 (DA38-102MB))
Application Note
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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
70
QP Pre
AV Pre
60
dBµV
50
40
30
20
10
0
-10
0.1
1
10
100
f / MHz
Figure 13 – Maximum load (60W) with 115 Vac (Line)
80
EN_V_QP
EN_V_AV
70
QP Pre
AV Pre
60
dBµV
50
40
30
20
10
0
-10
0.1
1
10
100
f / MHz
Figure 14 – Maximum load (60W) with 115 Vac (Neutral)
Application Note
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80
EN_V_QP
EN_V_AV
70
QP Pre
AV Pre
60
dBµV
50
40
30
20
10
0
-10
0.1
1
10
100
f / MHz
Figure 15 – Maximum load (60W) with 230 Vac (Line)
80
EN_V_QP
EN_V_AV
70
QP Pre
AV Pre
60
50
dBµV
40
30
20
10
0
-10
0.1
1
10
100
-20
f / MHz
Figure 16 – Maximum load (60W) 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 : BA voltage (VBA)
Channel 1; C1 : Drain voltage (VDrain)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA 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
18.85ms
18.85ms
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)
Soft Star time = 18.85ms(32 steps)
Soft Star time = 18.85ms(32 steps)
Figure 19 – Soft Start @ 85Vac & max. load
Figure 20– Soft Start @ 265Vac & max. load
Application Note
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11.3
Frequency jittering
64.4kHz
64.4kHz
69kHz
69kHz
Channel 2; C2 : Drain to source voltage (VDS)
Channel 2; C2 : Drain to source voltage (VDS)
Frequency jittering from 64.4 kHz ~ 69kHz
Frequency jittering from 64.4kHz ~ 69kHz
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 = 50%, VDS_peak=226V
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 = 11.3% VDS_peak=525V
Figure 24 – Operation @ Vin = 265Vac and max.
load
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60W 18V Demo board using ICE3BR1465JF
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=199mV (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=200mV (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=91mV
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=114mV
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
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60W 18V Demo board using ICE3BR1465JF
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 = 51mV
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 : BA voltage (VBA)
Blanking time to enter burst mode : 19ms (load step
down from 3.33A to 0.056A)
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 : BA voltage (VBA)
Blanking time to enter burst mode : 19ms (load step
down from 3.33A to 0.056A)
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 : BA voltage (VBA)
VCC OVP2 first & follows VCC OVP1 (R28
disconnected during system operating with no load)
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 (R28
disconnected during system operating with no
load)
Figure 34 – Vcc overvoltage protection @ 265Vac
Figure 33 – Vcc overvoltage protection @ 85Vac
11.10
VCC OVP1
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 19.34ms blanking time
(output load change from 3.33A to 4A, C19=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 19.34ms blanking time
(output load change from 3.33A to 4A, C19=100pF)
Figure 36 – Over load protection with built-in 20ms
blanking time @ 265Vac)
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60W 18V Demo board using ICE3BR1465JF
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 21.54ms(19.34+2.2)
blanking time (output load change from 3.33A to
4A, C19=10nF)
Figure 37 – Over load protection with
built-in+extended blanking time @ 85Vac
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA voltage (VBA)
Over load protection with 21.54ms(19.34+2.2)
blanking time (output load change from 3.33A to
4A, C19=10nF)
Figure 38 – Over load protection with
built-in+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 (R28 disconnected during
system operation at max. load) – over load
protection
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA voltage (VBA)
Open loop protection (R28 disconnected during
system operation at max. load) – over load
protection
Figure 39 – Open loop protection @ 85Vac
Figure 40 – Open loop protection @ 265Vac
Application Note
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60W 18V Demo board using ICE3BR1465JF
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 : 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)
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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60W 18V Demo board using ICE3BR1465JF
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 ICE3BR1465JF Off-Line SMPS Current Mode
Controller with Integrated 650V CoolMOS® and Startup cell ( frequency jitter Mode ) in FullPak”
[2]
Eric Kok Siu Kam, Kyaw Zin Min, Infineon Technologies, Application Note “ICE3BRxx65JF CoolSET®
F3R(FullPak) 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
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