20W 5V Evaluation Board using ICE3AR2280CJZ

Application Note, V1.1, Jul 2012
AN-EVAL3AR2280CJZ
20W 5V SMPS Evaluation Board with
CoolSET® F3R80 ICE3AR2280CJZ
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
© 2012 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
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or other persons may be endangered.
20W 5V Demoboard using ICE3AR2280CJZ on board
Revision History:
Previous Version:
Page
9
V1.1
1.0
Subjects (major changes since last revision)
Typo error
20W 5V SMPS Evaluation Board with CoolSET®F3R80 ICE3AR2280CJZ:
License to Infineon Technologies Asia Pacific Pte Ltd
Kyaw Zin Min
Kok Siu Kam Eric
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AN-PS0068
20W 5V Demoboard using ICE3AR2280CJZ
Table of Contents
Page
1 Abstract .......................................................................................................................................... 6 2 Evaluation board ........................................................................................................................... 6 3 List of features .............................................................................................................................. 7 4 Technical specifications............................................................................................................... 7 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.11 5.12 5.13 5.14 5.15 Circuit description ........................................................................................................................ 8 Introduction...................................................................................................................................... 8 Line input ......................................................................................................................................... 8 Start up ............................................................................................................................................ 8 Operation mode .............................................................................................................................. 8 Soft start .......................................................................................................................................... 8 RCD clamper circuit ........................................................................................................................ 8 Peak current control of primary current........................................................................................... 8 Output stage .................................................................................................................................... 8 Feedback and burst entry/exit control ............................................................................................. 9 Blanking window for load jump........................................................................................................ 9 Brownout mode ............................................................................................................................... 9 Fast AC reset .................................................................................................................................. 9 Active burst mode ........................................................................................................................... 9 Jitter mode, soft gate drive and the 50Ω gate turn on resistor ..................................................... 10 Protection modes .......................................................................................................................... 10 6 Circuit diagram ............................................................................................................................ 11 7 7.1 7.2 PCB layout ................................................................................................................................... 13 Top side......................................................................................................................................... 13 Bottom side ................................................................................................................................... 13 8 Component list ............................................................................................................................ 14 9 Transformer construction .......................................................................................................... 16 10 10.1 10.2 10.3 10.4 10.5 10.6 10.7 10.8 Test results .................................................................................................................................. 17 Efficiency ....................................................................................................................................... 17 Input standby power ...................................................................................................................... 18 Line regulation ............................................................................................................................... 19 Load regulation ............................................................................................................................. 19 Max. output power ......................................................................................................................... 20 ESD test ........................................................................................................................................ 20 Lightning surge test ....................................................................................................................... 20 Conducted EMI ............................................................................................................................. 21 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 11.15 11.16 Waveforms and scope plots ...................................................................................................... 23 Start up at low and high AC line input voltage and max. load ...................................................... 23 Soft start at low and high AC line input voltage and max. load..................................................... 23 Frequency jittering ......................................................................................................................... 24 Drain to source voltage and Current at max. load ........................................................................ 24 Load transient response (Dynamic load from 10% to 100%) ....................................................... 25 Output ripple voltage at max. load ................................................................................................ 25 Output ripple voltage during burst mode at 1 W load ................................................................... 26 Entering active burst mode ........................................................................................................... 26 Vcc over voltage protection (Odd skip auto restart mode)............................................................ 27 Over load protection (Odd skip auto restart mode) ....................................................................... 27 Open loop protection (Odd skip auto restart mode) ...................................................................... 28 VCC under voltage/Short optocoupler protection(Normal auto restart mode) ................................ 28 External protection enable/Secondary OVP by internal short (Latch mode) ................................ 29 External protection enable/Secondary OVP by external voltage source short (Latch mode) ....... 29 Brownout mode ............................................................................................................................. 30 Fast AC reset ................................................................................................................................ 30 Application Note
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Table of Contents
12 Page
References ................................................................................................................................... 31 Application Note
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1 Abstract
This document is an engineering report of an universal input 20W 5V off-line flyback converter power supply
utilizing IFX F3R80 CoolSET® ICE3AR2280CJZ. The application demo board is operated in Continuous and
Discontinuous Conduction Mode (CCM & DCM) and is running at 100 kHz switching frequency. It has a
single 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
ICE3AR2280CJZ is the enhanced version of ICE3ARxx80JZ (CoolSET® -F3R80), the major new featrures
includes slope compensation for continuous conduction mode (CCM), fast AC reset after latch enabled, fixed
voltage brownout detect/reset. Besides having the basic features of the F3R80 CoolSET® such as Active
Burst Mode, propagation delay compensation, soft gate drive, auto restart protection for major faults (Vcc
over voltage, Vcc under voltage, over temperature, over-load, open loop and short opto-coupler), it also has
the BiCMOS technology design, selectable entry and exit burst mode level, built-in soft start time, built-in
blanking time, frequency jitter feature and external latch enable, etc. The particular features need to be
stressed are 800V Mosfet,CCM/DCM operation, fixed voltage Brownout detect/reset, fast AC reset, the bestin-class low standby power and the good EMI performance.
2 Evaluation board
Figure 1 – EVALSF3R80-ICE3AR2280CJZ
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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3
List of features
800V avalanche rugged CoolMOS® with Startup Cell
Active Burst Mode for lowest Standby Power
Slope compensation for CCM operation
Selectable entry and exit burst mode level
100kHz internally fixed switching frequency with jittering feature
Auto Restart Protection for Over load, Open Loop, VCC Under voltage & Over voltage and Over
temperature
External latch enable pin and fast AC reset
Over temperature protection with 50°C hysteresis
Built-in 10ms Soft Start
Built-in 40ms blanking time for short duration peak power
Propagation delay compensation for both maximum load and burst mode
Brownout feature
BiCMOS technology for low power consumption and wide VCC voltage range
Soft gate drive with 50Ω turn on resistor
4 Technical specifications
Input voltage
85Vac~282Vac
Brownout detect/reset voltage
65/85Vac
Input frequency
50/60Hz
Input Standby Power
< 100mW @ no load
Output voltage
5V +/- 3%
Output current
4A
Output power
20W
Acitve mode average efficiency
>79%
Output ripple voltage
< 50mVp-p
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5
5.1
Circuit description
Introduction
The EVAL3AR2280CJZ demo board is a low cost off-line flyback switch mode power supply (SMPS) using
the ICE3AR2280CJZ integrated power IC from the CoolSET®-F3R80 family. The circuit, shown in Figure 3,
details a 5V, 20W power supply that operates from an AC line input voltage range of 85Vac to 282Vac and
brownout detect/reset voltage is 65/85Vac, suitable for applications in enclosed adapter or open frame
auxiliary power supply for different system such as PC, server, DVD, LED TV, Set-top box, etc.
5.2
Line input
The AC line input side comprises the input fuse F1 as over-current protection. The choke L11, X-capacitor
C11, C114 and Y-capacitor C12 act as EMI suppressors. Optional spark gap device SA1, SA2 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 120 to 400 VDC is present which depends on input voltage.
5.3
Start up
Since there is a built-in startup cell in the ICE3AR2280CJZ, 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
ICE3AR2280CJZ, the startup cell will charge up the Vcc capacitor C16 and C17. When the Vcc voltage
exceeds the UVLO at 17V, 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. 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 10ms.
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 (V(BR)DSS = 800V) 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 ICE3AR2280CJZ 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. A revised propagation delay compensation with CCM and
slope compensation factor are implemented. It can give a good maximum power control.
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
capacitors C22 is selected to have a very small internal resistance (ESR) to minimize the output voltage
ripple.
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5.9
Feedback and burst entry/exit control
FBB combines the feedback function and burst entry/exit control.
The output voltage is controlled by using a TL431 (IC21) which 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 R211. Optocoupler IC12 is
used for floating transmission of the control signal to the “Feedback” input of the ICE3AR2280CJZ. The
optocoupler used meets DIN VDE 884 requirements for a wider creepage distance.
The capacitor C18 filters the noise from going to the FBB pin and the resistor R113 (Rsel resistor) at the FBB
pin sets the selection of the burst entry/exit level. During IC first start up (Vcc=0~17V), Rfb resistor is isolated
from FBB pin and Isel (3.5µA) will start to charge the R113 (Rsel resistor). Based on the charged voltage level
at R113 (Rsel resistor), the entry and exit burst level are set. The below table is the control logic for the entry
and exit level with R113 (Rsel resistor) voltage.
Entry level
Level
Rsel
VFBB
1
2
3
<405kΩ
685kΩ~900kΩ
>1530kΩ
VFBB < Vref1 (1.8V)
Vref1 (1.8V) <VFBB < Vref2 (4V)
VFBB > Vref2 (4V)
% of Pin max
5%
10%
15%
VFB burst
1.29V
1.61V
1.84V
Exit level
% of Pin max
11%
20%
27%
Vcsth burst
0.21V
0.29V
0.34V
5.10 Blanking window for load jump
In case of load jumps the controller provides the built in blanking window (40ms) before activating the Over
Load Protection and entering the Odd skip Auto Restart Mode.
5.11 Brownout mode
When the AC line input voltage is lower than the input voltage range, brownout mode is detected by sensing
the voltage level at BRL pin through the voltage divider resistors from AC hold up circuit. Once the voltage
level at BRL pin falls below 1V for 270µs, the controller stops switching and enters into brownout mode. It is
until the input level goes back to input voltage range, VBRL > 1.25V and the Vcc hits 17V, the brownout mode
is released.
If the brownout feature is not needed, it needs to tie the BRL pin to the Vcc pin through a current limiting
resistor (R114), 5MΩ~10ΜΩ. The BRL pin cannot be in floating condition.
Note: A filter capacitor (e.g. 100pF (min. value)) may be needed to add to the BRL pin if the noise cannot be
avoided to enter that pin in the physical PCB layout. Otherwise, some protection features may be mistriggered and the system may not be working properly.
5.12 Fast AC reset
During normal operation, the ICE3AR228080CJZ can be latched by pulling down the BRL voltage below
0.4V for 210µs and this can be reset by 2 condtions. The first one is to pull down the Vcc voltage to below
8V. However, the Vcc drop would take quite a long time if it is by normal AC power down. The second one is
to have a slow rise time of the BRL voltage from 0.4V to 1V for at least 450ms after the BRL pin is pulled
down, then IC can reset latch mode and it is also called the fast AC reset.
5.13 Active burst mode
At light load condition, the SMPS enters into Active Burst Mode. For this F3R80 CoolSET®, the entry/exit
burst mode level is selected by a Rsel resistor at FBB pin (refer to section 5.9). The light load condition is
actually reflected to the FB voltage level for the CCM/DCM operation; i.e. FB voltage drops according to how
light the load is. With the selectable feature, the enter burst mode level, VFB_burst is determined by the Rsel
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resistor at FBB pin. After entering burst mode, the controller is always active and thus the VCC must always
be kept above the switch off threshold VCCoff ≥ 10.5V. During the active burst mode, the efficiency maintains
in a very high level and at the same time it supports low ripple on VOUT and fast response on load jump. To
avoid mis-triggering of the burst mode, there is a 20ms internal blanking time. Once the FB voltage drops
below VFB_burst, the internal blanking timer starts to count. When it reaches the built-in 20ms blanking time, it
then enters Active Burst Mode.
During Active Burst Mode the current sense voltage limit is reduced from 1V to Vcsth_burst 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 0.62mA. At burst mode, the FB voltage is
changing like a sawtooth between 3.2 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.
5.14 Jitter mode, soft gate drive and the 50Ω gate turn on resistor
In order to obtain better EMI performance, the ICE3AR2280CJZ is implemented with frequency jittering, soft
gate drive and 50Ω gate turn on resistor.
The jitter frequency is internally set at 100 kHz (+/-4 kHz) and the jitter period is set at 4ms.
5.15 Protection modes
Protection is one of the major factors to determine whether the system is safe and robust. Therefore
sufficient protection is necessary. ICE3AR2280CJZ provides three kinds of protection mode; normal auto
restart mode, odd skip auto restart mode and non switch auto restart mode.
In odd skip auto restart mode, there is no detect of fault and no switching pulse for the odd number restart
cycle. At the even number of restart cycle, the fault detects and soft start switching pulses are maintained. If
the fault persists, it would continue the auto-restart mode. However, if the fault is removed, it can release to
normal operation only at the even number auto restart cycle.
Non switch auto restart mode is similar to odd skip auto restart mode except the start up switching pulses are
also suppressed at the even number of the restart cycle. The detection of fault still remains at the even
number of the restart cycle. When the fault is removed, the IC will resume to normal operation at the even
number of the restart cycle.
The main purpose of the odd skip auto restart is to extend the restart time such that the power loss during
auto restart protection can be reduced when a small Vcc capacitor is used. A list of protections and the
failure conditions are shown in the following table.
Protection functions
VCC overvoltage
Over load
Open loop
VCC under voltage
short optocoupler
Over temperature
External protection enable
Failure condition
VCC > 25.5V & last for 150µs
VFBB > 4.5V & last for 40ms
-> Overload
VCC < 10.5V
-> VCC under voltage
TJ > 130°C ( recovered with 50°C hysteresis)
VBBA < 0.4V & last for 210µs
Protection Modes
Odd skip auto restart
Odd skip auto restart
Odd skip auto restart
Normal auto restart
Normal auto restart
Non switch auto restart
Latch
N.B.: For External protection enable/Secondary OVP by external voltage source short (Latch mode) as
shown in 11.14 (Fig 44 & 45), optional (OVP ckt power) & (FB disable ckt) are necessary to add.
The purpose of (OVP ckt power) is feeding the power to IC13 (optocoupler) during normal time and
disable the power during fault time, so that IC can enter latch mode in any fault conditions.
The purpose of (FB disable ckt) is to exit the IC from burst mode to normal mode during fault time,
since external protection enable feature is only work in normal operation mode.
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6
Circuit diagram
Figure 3 – 20W 5V ICE3AR2280CJZ power supply schematic
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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.
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7
7.1
PCB layout
Top side
Figure 4 – Top side component legend
7.2
Bottom side
Figure 5 – Bottom side copper & component legend
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8
Component list
No
Designator
1
2
5
3
4
5
6
7
8
10
11
12
13
14
15
16
17
18
20
21
22
23
24
25
26
27
BR1
C11
C12
C13
C14
C15
C16
C17,C27
C18,C19,C26
C22
C23
C25
C28
C112
C114
C115
D11
D12
D13,D14
D21
D22
F1
HS1
IC11
IC12,IC13
IC21,IC22
J11,J12,J13,J14,J15,
J21,R16,R115,L22
L N, +5V Com
L11
L21
Q11,Q12,Q13
R11
R12
R13
R14
R15
R17
R18
R19,R110,R111
R112
R113
R117
R118
R120
R121
R22
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
Application Note
Component
description
600V,1.5A
0.33uF,305V
2.2nF,250V,Y1
82uF,450V
1µF,450V
2.2nF,630V
22µF,50V
0.1µF
1nF
2200µF,10V
1000µF,10V
470nF
10µF,50V
47nF,63V
0.1uF,305V
0.1µF
800V,1A
200V,0.2A
600V,1A
45V,30A
100V,0.1A
1A,250V
Heat sink
ICE3AR2280CJZ
SFH617A-3
TL431
Part No.
Manufacturer
DFL1506S
B32922A2334+***
DE1E3KX222MA4BL01
B43504A5826M000
B43041A5105M000
B41851A6226M***
RPER71H104K2K1A03B
RPE5C1H102J2K1A03B
VISHAY
EPCOS
MURATA
EPCOS
EPCOS
EPCOS
EPCOS
MURATA
MURATA
B41851A6106M***
EPCOS
EPCOS
B32922C3104K000
EPCOS
UF4006
1N485B
UF4005
VFT3045C
1N4148
VISHAY
VISHAY
VISHAY
ICE3AR2280CJZ
INFINEON
B82732-R2901-B30
EPCOS
2N7002
INFINEON
Jumper
Connector
2 x 27mH, 0.9A
1.5uH,6.3A
60V,0.3A
100k,2W
20R
47R
1R,1W,1%
10R
0R
24k
3M
105k
820k
100k
40k
40k
100k
68R
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48
49
50
51
52
53
R23,R211
R24
R26
R27,R28
R29
R213
54
TR1
55
ZD11
Application Note
1.1k
3.6k
10k,1%
10k,1%
6.2k,1%
150R
LP =1mH(87:4:10),
E20/10/6(N87)
24V/.5W
15
B662061110T001
EPCOS
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9
Transformer construction
Core: E20/10/6, N87(EPCOS)
Bobbin: Horizontal Version
Primary Inductance, Lp=1mH, measured between pin 4 and pin 5 (Gapped to inductance)
Leakage Inductance <5% of Lp, measured between pin 4 and pin 5 while other outputs are short(short pin 6,
7,8 & 9, short pin 1 & 2)
Figure 6 – Transformer structure and top view of transformer complete
Wire size requirement:
Application Note
Start
5
Stop
3
No. of turns
44
Wire size
1XAWG#28
8,9
3
6,7
4
4
43
4XTIW(0.45mm)
1XAWG#28
Secondary
1
/2 Primary
2
1
10
1XAWG#28
Auxiliary
16
Layer
/2 Primary
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10
Test results
10.1 Efficiency
Figure 7 – Efficiency vs. AC line input voltage
Figure 8 – Efficiency vs. output power @ low and high line
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10.2 Input standby power
Figure 9 – Input standby power @ no load vs. AC line input voltage (measured by Yokogawa WT210
power meter - integration mode)
Figure 10 – Input standby power @ 0.5W, 1W, 2W & 3W vs. AC line input voltage (measured by
Yokogawa WT210 power meter - integration mode)
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10.3 Line regulation
Figure 11 – Line regulation Vo @ full load vs. AC line input voltage
10.4 Load regulation
Figure 12 – Load regulation Vout vs. output power
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10.5 Max. output power
Figure 13 – Max. input power (before over-load protection) vs. AC line input voltage
10.6 ESD test
Pass (EN61000-4-2): 16kV for contact discharge
Pass (EN61000-4-2): 20kV for contact discharge (added ferrite bead (TOKIN B-20L-25) at D22 cathode side)
10.7 Lightning surge test
Pass (EN61000-4-5): 4kV for line to earth
Pass (EN61000-4-5): 6kV for line to earth (added surge absorber device; SA1 & SA2 (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 (20W) with input voltage of 115Vac and
230Vac.
Figure 14 – Max. Load (20W) with 115 Vac (Line)
Figure 15 – Max. Load (20W) with 115 Vac (Neutral)
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Figure 16 – Max. Load (20W) with 230 Vac (Line)
Figure 17 – Max. Load (20W) with 230 Vac (Neutral)
Pass conducted EMI EN55022 (CISPR 22) class B with > 6dB margin.
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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 max. load
558ms
558ms
Entry/exit burst
selection (Level 2)
Entry/exit burst
selection (Level 2)
Channel 1; C1 : Drain voltage (VD)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
Channel 1; C1 : Drain voltage (VD)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
Startup time = 558ms
Startup time = 558ms
Figure 18 – Startup @ 85Vac & max. load
Figure 19 – Startup @ 282Vac & max. load
11.2 Soft start at low and high AC line input voltage and max. load
7.8ms
9.39ms
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
Soft Start time = 9.39ms(32 steps)
Soft Start time = 7.8ms(26 steps)
Figure 20 – Soft Start @ 85Vac & max. load
Figure 21– Soft Start @ 282Vac & max. load
Application Note
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20W 5V Demoboard using ICE3AR2280CJZ
11.3 Frequency jittering
105kHz
105kHz
3.8ms
3.8ms
97kHz
97kHz
Channel 1; C1 : Drain voltage (VD)
Channel 1; C1 : Drain voltage (VD)
Frequency jittering from 97 kHz ~ 105 kHz, Jitter
period is 3.8ms
Frequency jittering from 97kHz ~ 105 kHz, Jitter
period is 3.8ms
Figure 22 – Frequency jittering @ 85Vac and max.
load
Figure 23 – Frequency jittering @ 282Vac and
max. load
11.4 Drain to source voltage and Current at max. load
Channel 1; C1 : Drain voltage (VDrain)
Channel 2; C2 : Drain current (IDS)
Duty cycle = 18%, VDrain_peak = 644V
Figure 25 – DCM Operation @ 282Vac and max.
load
Channel 1; C1 : Drain voltage (VDrain)
Channel 2; C2 : Drain current (IDS)
Duty cycle = 50%, VDrain_peak = 349V
Figure 24 – CCM Operation @ 85Vac and max.
load
Application Note
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20W 5V Demoboard using ICE3AR2280CJZ
11.5 Load transient response (Dynamic load from 10% to 100%)
Channel 1; C1 : Output ripple voltage (Vo)
Channel 2; C2 : Output current (Io)
Channel 1; C1 : Output ripple voltage (Vo)
Channel 2; C2 : Output current (Io)
Vripple_pk_pk=433mV (Load change from10% to
100%,100Hz,0.4A/μS slew rate)
Probe terminal end with decoupling capacitor of
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
Vripple_pk_pk=346mV (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 @ 85Vac
Figure 27 – Load transient response @ 282Vac
11.6 Output ripple voltage at max. load
Channel 1; C1 : Output ripple voltage (Vo)
Channel 2; C2 : Output current (Io)
Channel 1; C1 : Output ripple voltage (Vo)
Channel 2; C2 : Output current (Io)
Vripple_pk_pk=47mV
Probe terminal end with decoupling capacitor of
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
Vripple_pk_pk = 47mV
Probe terminal end with decoupling capacitor of
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
Figure 28 – AC output ripple @ 85Vac and max.
load
Figure 29 – AC output ripple @ 282Vac and max.
load
Application Note
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20W 5V Demoboard using ICE3AR2280CJZ
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=14mV
Probe terminal end with decoupling capacitor of
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
Vripple_pk_pk = 14mV
Probe terminal end with decoupling capacitor of
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
Figure 30 – AC output ripple @ 85Vac and 1W load
Figure 31 – AC output ripple @ 282Vac and 1W
load
11.8 Entering active burst mode
19 ms
19ms
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
Blanking time to enter burst mode : 19ms (load step
down from 4A to 0.2A)
Figure 32 – Active burst mode @ 85Vac
Application Note
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
Blanking time to enter burst mode : 19ms (load
step down from 4A to 0.2A)
Figure 33 – Active burst mode @ 282Vac
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11.9 Vcc over voltage protection (Odd skip auto restart mode)
VCC OVP
VCC OVP
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
VCC OVP (R27 disconnected during system
operating at no load)
Remark; Removed J13(disable latch mode)
Figure 34 – Vcc overvoltage protection @ 85Vac
11.10
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
VCC OVP (R27 disconnected during system
operating at no load)
Remark; Removed J13(disable latch mode)
Figure 35 – Vcc overvoltage protection @ 282Vac
Over load protection (Odd skip auto restart mode)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
Over load protection with built-in blanking time =
38ms (output load change from 4A to 6A)
Figure 36 – Over load protection with built-in
blanking time @ 85Vac)
Application Note
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
Over load protection with built-in blanking time =
38ms (output load change from 4A to 6A)
Figure 37 – Over load protection with built-in
blanking time @ 282Vac)
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11.11
Open loop protection (Odd skip auto restart mode)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
Open loop protection (R27 disconnected during
system operation at max. load) – over load
protection
Remark; Removed J13(disable latch mode)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
Open loop protection (R27 disconnected during
system operation at max. load) – over load
protection
Remark; Removed J13(disable latch mode)
Figure 38 – Open loop protection @ 85Vac
Figure 39 – Open loop protection @ 282Vac
11.12
VCC under voltage/Short optocoupler protection(Normal auto restart mode)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
VCC under voltage/short optocoupler protection
(short the transistor of optocoupler(IC12) during
system operating @ full load & release)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
VCC under voltage/short optocoupler protection
(short the transistor of optocoupler during system
operating @ full load & release)
Figure 40 – Vcc under voltage/short optocoupler
protection @ 85Vac
Figure 41 – Vcc under voltage/short optocoupler
protection @ 282Vac
Application Note
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20W 5V Demoboard using ICE3AR2280CJZ
11.13
External protection enable/Secondary OVP by internal short (Latch mode)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Output voltage (VO)
Channel 4; C4 : BRL voltage (VBRL)
External protection enable (short R26 during system
operating at 1A load)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Output voltage (VO)
Channel 4; C4 : BRL voltage (VBRL)
External protection enable (short R26 during
system operating at 1A load)
Figure 42 – External protection enable @ 85Vac
Figure 43– External protection enable @ 282Vac
11.14
External protection enable/Secondary OVP by external voltage source
short (Latch mode)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Output voltage (VO)
Channel 4; C4 : BRL voltage (VBRL)
External protection enable (feed 12V/2A external
power source to output voltage,5V rail during
system operating at 1A load)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Output voltage (VO)
Channel 4; C4 : BRL voltage (VBRL)
External protection enable (feed 12V/2A external
power source to output voltage,5V rail during
system operating at 1A load)
Figure 44 – External protection enable @ 85Vac
Figure 45– External protection enable @ 282Vac
Application Note
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20W 5V Demoboard using ICE3AR2280CJZ
11.15
Brownout mode
115Vdc
93Vdc
23Vdc
92Vdc
115Vdc
12Vdc
12Vdc
23Vdc
Channel 1; C1 : DC line input voltage (VC14)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Current sense voltage (VCS)
Channel 4; C4 : BRL voltage (VBRL)
IC on & 1st detect brownout: VC14= 23Vdc
Brownout reset: VC14= 115Vdc (83Vac), VBRL=1.25V
Brownout detect: VC14= 93Vdc (66Vac), VBRL=1V
IC off: VC14= 12Vdc
Channel 1; C1 : DC line input voltage (VC14)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Current sense voltage (VCS)
Channel 4; C4 : BRL voltage (VBRL)
IC on & 1st detect brownout:VC14= 23Vdc
Brownout reset: Vbulk= 120Vdc (83Vac),VBRL=1.25V
Brownout detect: Vbulk= 90.5Vdc (64Vac), VBRL=1V
IC off: VC14= 12Vdc
Figure 46 – Brownout mode with max. load
Figure 47 – Brownout mode with no load
11.16
Fast AC reset
Enter Latch
Enter Latch
AC off
AC on
AC off
AC on
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
AC reset time=2.5s
short the R26 while system running at 1A load(to
simulate latch), then switch off main AC & on again
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFBB)
Channel 4; C4 : BRL voltage (VBRL)
AC reset time=15s
short the R26 while system running at 1A load(to
simulate latch), then switch off main AC & on again
Figure 48 – Fast AC reset timing @ 85Vac
Figure 49– Fast AC reset timing @ 282Vac
Application Note
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20W 5V Demoboard using ICE3AR2280CJZ
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)
12
References
[1]
Infineon Technologies, Datasheet “CoolSET®-F3R80 ICE3AR2280CJZ Off-Line SMPS Current Mode
Controller with integrated 800V CoolMOS® and Startup cell( brownout & CCM) in DIP-7”
[2]
Kyaw Zin Min, Kok Siu Kam Eric, Infineon Technologies, Design Guide “ICE3ARxx80CJZ CoolSET®
F3R80 (DIP-7) brownout & CCM 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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