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Application Note, V1.0, May 2009
AN-EVALSF3-ICE3AS03LJG
65W 19.5V SMPS Evaluation Board with F3
PWM controller ICE3AS03LJG
Power Management & Supply
N e v e r
s t o p
t h i n k i n g .
Edition 2009-05-15
Published by Infineon Technologies Asia Pacific,
8 Kallang Sector,
349282 Singapore, Singapore
© Infineon Technologies AP 2009.
All Rights Reserved.
Attention please!
The information herein is given to describe certain components and shall not be considered as a guarantee
of characteristics.
Terms of delivery and rights to technical change reserved.
We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement,
regarding circuits, descriptions and charts stated herein.
Information
For further information on technology, delivery terms and conditions and prices please contact your 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 your nearest Infineon Technologies Office.
Infineon Technologies Components may only be used in life-support devices or systems 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 intended to be implanted in the human body, or to support
and/or maintain and sustain 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.
65W 19.5V Demo board using ICE3AS03LJG on board
Revision History:
Previous Version:
Page
2009-5-15
V1.0
none
Subjects (major changes since last revision)
65W 19.5V SMPS Evaluation Board with F3 PWM controller ICE3AS03LJG:
License to Infineon Technologies Asia Pacific Pte Ltd
Kyaw Zin Min
Kok Siu Kam Eric
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AN-PS0037
65W 19.5V Demo board using ICE3AS03LJG on board
Table of Contents
Page
1
Abstract .......................................................................................................................................5
2
Evaluation Board ........................................................................................................................5
3
List of Features ...........................................................................................................................7
4
Technical Specifications ............................................................................................................7
5
Circuit Diagram ...........................................................................................................................8
6
6.1
6.2
PCB Layout ...............................................................................................................................10
Component side component legend ...........................................................................................10
Solder side copper & component legend ....................................................................................10
7
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
7.10
7.11
7.12
7.13
7.14
7.15
Circuit Description....................................................................................................................11
Introduction.................................................................................................................................11
Line Input....................................................................................................................................11
Start up.......................................................................................................................................11
Operation mode..........................................................................................................................11
Soft start .....................................................................................................................................11
RCD Clamper circuit ...................................................................................................................11
Main switcher..............................................................................................................................11
Gate drive ...................................................................................................................................12
Peak current control of primary current.......................................................................................12
Output Stage ..............................................................................................................................12
Feedback and regulation ............................................................................................................12
Blanking Window for Load Jump ................................................................................................12
Active Burst Mode.......................................................................................................................12
Jitter mode..................................................................................................................................13
Protection modes........................................................................................................................13
8
Component List ........................................................................................................................14
9
Transformer Construction .......................................................................................................15
10
10.1
10.2
10.3
10.4
10.5
10.6
10.7
10.8
Test Results ..............................................................................................................................16
Efficiency ....................................................................................................................................16
Input Standby Power ..................................................................................................................17
Line Regulation...........................................................................................................................18
Load Regulation .........................................................................................................................19
Max. Overload Output Power......................................................................................................19
ESD ............................................................................................................................................20
Lightning Surge ..........................................................................................................................20
Conducted EMI test ....................................................................................................................20
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
Waveforms and Scope Plots....................................................................................................21
Startup waveforms @ full load ....................................................................................................21
Drain-Source voltage and current @ full load .............................................................................21
Frequency jittering ......................................................................................................................22
Load transient response (Load jump from 10% to 100%) ...........................................................22
Output ripple voltage @ Full Load ..............................................................................................23
Output ripple voltage during burst mode @ 1W Load .................................................................23
Active burst mode @ 1W load ....................................................................................................24
Vcc overvoltage protection - Latched Off ....................................................................................24
External protection enable (Mosfet OTP) – Latched Off..............................................................25
Over load protection without/with extended blanking time-Auto Restart......................................26
Open loop protection – Auto Restart...........................................................................................27
Vcc under voltage/Short optocoupler – Auto Restart ..................................................................27
12
References ................................................................................................................................28
Application Note
4
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
1 Abstract
This document is an engineering report that describes a universal input power supply designed in a 19.5V
65W off line flyback converter that utilizes the F3 PWM controller ICE3AS03LJG. The application board is
operated in discontinuous current mode and running at 100 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 ICE3AS03LJG is a current mode
PWM controller. With the 500V startup cell, active burst mode and BiCMOS technologies, the standby power
can be <100mW at no load. 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 approach 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.
For this IC, it provides both auto-restart and latch off protection mode. For those serious faults such as Vcc
over-voltage, over temperature, short transformer winding, etc, the IC will enter the latched off protection
mode. For those less severe case such as the over load, open loop, short opto-coupler, etc, it enters the
auto restart protection mode. In case it needs customer defined protection, the external latch off enable
feature can fulfill the requirement. By using this feature, an external over temperature protection circuit for
the MOSFET is implemented in this evaluation board.
2 Evaluation Board
Figure 1a – EVALSF3-ICE3AS03LJG (top view)
Application Note
5
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
Figure 1b – EVALSF3-ICE3AS03LJG (bottom view)
This document contains the list of features, the power supply specification, schematic, bill of material and the
transformer construction drawing. Typical operating characteristics and performance curves with scope
waveforms are presented at the rear of the report.
Application Note
6
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
3 List of Features
500V Startup Cell switched off after Start Up
Active Burst Mode for lowest Standby Power
Fast load jump response in Active Burst Mode
100kHz internally fixed switching frequency
Built-in Latched Off Protection Mode for Overtemperature, Overvoltage & Short Winding
Built-in Auto Restart Protection Mode for Overload, Open Loop,VCC Undervoltage & Short Optocoupler
Built-in Soft Start
Built-in blanking window with extendable blanking time for short duration high current
External latch off enable function
Max Duty Cycle 75%
Overall tolerance of Current Limiting < ±5%
Internal PWM Leading Edge Blanking
BiCMOS technology provide wide VCC range
Frequency jitter and soft gate driving for low EMI
4 Technical Specifications
Input voltage
85VAC~265VAC
Input frequency
50Hz, 60Hz
Input Standby Power
< 100mV @ no load; < 1W @ 0.5W load
Output voltage and current
19.5V +/- 2%
Output current
3.34A
Output power
65W
Average Efficiency
>85% (115Vac & 230Vac)
Output ripple voltage
< 130mVp-p
Application Note
7
2009-05-15
8 5V ~ 26 5V
2A
#VAR
Q2
R8
C18
100k 0.1uF
R7
27k(1% )
R6
110k(1% )
Q3
R25
0R
L2
3.3mH 1.8A
#SG 2
L1
27mH 1.7A
External OTP
#C19
R9
62k(1% )
#R13
C1
#SG 1
C2
0.1uF
100nF
C10
C9
24V
ZD1
#NTC 1
10R
R4
IC1
100R
R3
5 HV
8 Gnd
1nF
C11
2 FB
C8
#C7
4 Gate
R23
0R
R5
9R1
0R
R2
R10
0.47R/0.5W
R14
0R
R24
0R
1N4148
D4
D3
C6
3 3k /2W
3
4
1N4148
R1
D1
UF4006
C4
10nF/400V
SPA07N60C3
Q1
R11
0.51R/0.5W
C3
120uF
400V
10uF
35V
3 CS
1 BL ICE3AS03LJG
7 Vcc
BR1
4A 600V
65W(19.5V X 3.34A) SMPS Demo Board using ICE3AS03LJG and SPA07N60C3(V 1.1)
Kyaw Zin Min, Eric Kok/ 30 Apr 2009
N
L
0 .47 uF
3 05 V
#R12
3 05 V
0 .33 uF
F1
4 70 k
NTC 2
BC8 07
8
BC8 17
Application Note
3
2
1
5
6
4 7pF/1 kV
IC2 SFH617A-3
2
1
IC3
TL431
R22
820R
R21
1.2k
R20
39k
470pF
*R19
220uF
25V
R18
3.6k, 1%
C13
68nF
R17
470R, 1%
R16
24k, 1%
C14
C12
C17
L3
1.5uH
2200uF
25V
#C15
MBR20H150CT
D2
#R15
T1
ER28,98uH(P=24,S=5,A=4)
11
12
C5 2.2nF
#C16
#L4
Com
19.5V/3.34A
65W 19.5V Demoboard using ICE3AS03LJG on board
5 Circuit Diagram
Figure 2 – 65W 19.5V ICE3AS03LJG power supply schematic
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
N.B.: In order to get the optimized performance of the PWM controller, the grounding of the PCB layout must
be taken very carefully. From the circuit diagram above, it shows that the grounding for the PWM
controller can be split into several groups; signal ground, Vcc ground and Current sense resistor
ground. All the split ground should be connected to the bulk capacitor ground directly.
• Signal ground includes all small signal grounds connecting to the PWM controller GND pin such as
filter capacitor ground of C9, C10, C11, C7 and opto-coupler ground.
• Vcc ground includes the Vcc capacitor ground, C8 and the auxiliary winding ground; pin 6 of the
power transformer.
• Current Sense resistor ground includes current sense resistor R10 and R11.
Application Note
9
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
6 PCB Layout
6.1 Component side component legend
Figure 3 – Component side Component Legend – View from Component Side
6.2 Solder side copper & component legend
Figure 4a – Solder side copper – View from Component Side
Figure 4b – Solder side component legend – View from Component Side
Application Note
10
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
7 Circuit Description
7.1 Introduction
The EVALSF3-ICE3AS03LJG demo board is an off line flyback switch mode power supply (SMPS) using the
ICE3AS03LJG PWM IC from the Infineon PWM controller. The circuit, shown in Figure 2, details a 19.5V,
65W power supply that operates from an AC line input voltage range of 85Vac to 265Vac, suitable for
applications requiring either an open frame supply or an enclosed adapter.
7.2 Line Input
The AC input side comprises the input fuse F1 as over-current protection. The common mode choke L1 and
L2, X2-capacitors C1 and C2 and Y1-capacitor C5 act as EMI suppressors. A varistor VAR (optional) is
added to absorb the line transient while a NTC1 (optional) is added to reduce the inrush surge current during
start up. Two series resistor, R12 and R13 (optional) are added to discharge the voltage at C1 and C2 after
the AC line is removed. A rectified DC voltage (120V ~ 375V) is obtained through the bridge rectifier BR1
and the input bulk capacitor C3.
7.3 Start up
Since there is a built-in startup cell in the ICE3AS03LJG, there is no need for external start up resistors. The
startup cell is connecting the HV pin of the IC. Once the voltage is built up at the HV pin of the
ICE3AS03LJG, the startup cell will charge up the Vcc capacitor C8 and C9. 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.
7.4 Operation mode
During operation, the Vcc pin is supplied via a separate transformer winding with associated rectification D3
and buffering and filtering capacitors C8 and C9. Resistor R2 and R3 are used for current limiting. In order
not to exceed the maximum voltage at Vcc pin, an external zener diode ZD1 and R4 is added to clamp the
voltage.
7.5 Soft start
The Soft-Start time is built-in 10ms. After the Vcc hits UVLO at 18V, it starts the soft-start phase.
7.6 RCD Clamper circuit
While turning off the switch Q1, the clamper circuit R1, C4 and D1 absorbs the current caused by
transformer leakage inductance once the voltage exceeds clamper circuit voltage. Then drain to source
voltage is well below the maximum break down voltage.
7.7 Main switcher
Q1 is the main switcher for the system. It has a low Rdson to reduce the conduction loss. An optional drainsource capacitor C6 can be added to the MOSFET to reduce the switching noise so as to get a better EMI
performance.
Application Note
11
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
7.8 Gate drive
The gate drive current is 0.17A push and 0.39A pull. The gate on signal has installed with a slope controlled
rising edge feature which make the driving softly. If it needs to optimize the EMI performance, a turn off
resistor-diode network (R24 and D4) can be added in parallel with the gate drive resistor (R5) so as to turn
the device off faster than it is turned on.
7.9 Peak current control of primary current
The power MOSFET drain source current is sensed via external shunt resistors R10 and R11 which
determine the tolerance of the current limit control. Since ICE3AS03LJG is a current mode controller, it would
have a cycle-by-cycle primary current and feedback voltage control which can make sure the maximum
power of the converter is controlled in every switching cycle. Besides, propagation delay compensation is
implemented to ensure the maximum input current/power can be controlled in an even tighter manner. The
demo board shows app. +/-3.6% (refer to Figure 13).
7.10 Output Stage
The power is coupled to the secondary side through schottky diode D2. The capacitor C12 provides energy
buffering and the cascading LC filter L2 and C14 is used to reduce the output voltage ripple. The capacitor
C12 is selected to have a low internal resistance (ESR) to minimize the output voltage ripple.
7.11 Feedback and regulation
The output voltage is controlled by a TL431 reference control IC (IC3). This device incorporates the voltage
reference as well as the error amplifier. Compensation network C13, C17, R16, R17, R18, R19 and R20
constitutes the loop compensation circuit. 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 IC2 is used
to transmit the control signal to the “Feedback” input of the ICE3AS03LJG device. The selected optocoupler
should meet DIN VDE 884 requirements for a wider creepage distance.
7.12 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. There are 2 modes for the blanking time setting; basic mode and the
extendable mode. If there is no capacitor added to the BL pin, it would fall into the basic mode; i.e. the
blanking time is set at 20ms. If a longer blanking time is required, a capacitor, C10 can be added to BL pin to
extend it. The extended time can be achieved by an internal 13uA constant current at BL pin to charge C10
from 0.9V to 4.0V. Thus the overall blanking time is the addition of 20ms and the extended time. For
example, C10 (external capacitor at BL pin) = 0.22uF, IBK (internal charging current) = 13uA
Blanking time (total) = 20ms + C10 X (4-0.9)/IBK = 72.5ms
Note: A filter capacitor (e.g. 100pF) may be needed to add to the BL pin if the noises cannot be avoided to
enter that pin in the physical PCB layout. Otherwise, some protection features may be mis-triggered and the
system may not be working properly.
7.13 Active Burst Mode
At light load condition, the SMPS enters into Active Burst Mode. At this stage, the controller is always active
but the VCC must be kept above the switch off threshold; i.e. 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 1.23V, 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.
Application Note
12
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
During Active Burst Mode the current sense voltage limit is reduced from 1V to 0.25V 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 sawtooth between 3.0 and 3.5V. To leave Burst Mode, FB voltage must exceed 4.2V. It will
reset the Active Burst Mode and turn the SMPS into Normal Operating Mode. The maximum current; i.e.
current sense voltage limit resume to 1V, can then be provided to stabilize VOUT.
7.14 Jitter mode
The ICE3AS03LJG has frequency jittering feature to reduce the EMI noise. The jitter frequency is internally
set at 100 kHz (+/-4 kHz) and the jitter period is set at 4ms.
7.15 Protection modes
Protection is one of the major factors to determine whether the system is safe and robust. Therefore,
sufficient protection is a must. ICE3AS03LJG provides all the necessary protections to ensure the system is
operating safely. There are 2 kinds of protection mode; auto-restart and latch off mode. When there are
serious faults such as Vcc over-voltage, over temperature and short winding, it enters the latch off mode. For
those less severe faults such as over load, open loop, Vcc under-voltage and short optocoupler, it enters the
auto-restart mode. In addition, there is an external latch enable feature which is suitable for those tailor-made
protection features. An external OTP circuit is implemented to protect the MOSFET surface temperature at
110°C (heatsink temperature at 106°C). A list of protections and the failure conditions are showed in the
below table.
Protection function
Failure condition
Vcc Over-voltage
Vcc > 25.5V
Latch off
Over-temperature (controller junction)
TJ > 130°C
Latch off
Short winding / Short diode
VCS > 1.66V
Latch off
External Latch off enable
VBL < 0.33V
Latch off
Over-load / Open loop
VFB > 4.2V and VBL > 4.0V and
after Blanking time
Auto Restart
Vcc Under-voltage / short Opto-coupler
Vcc < 10.5V
Auto Restart
Application Note
13
Protection Mode
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
8 Component List
No
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
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
Circuit code
BR1
C1
C9,C10,C18
C11
C12
C13
C14
C17
C2
C3
C4
C5
C6
C8
D1
D2
D3,D4
F1
IC1
IC2
IC3
J1 ~ J6,NTC1,R23,R24,R14,L3
L1
L2
L3
NTC2
Q1
Q2
Q3
R1
R10
R11
R16
R17
R18
R2,R25
R20
R21
R22
R3
R4
R5
R6
R7
R8
R9
T1
ZD1
Application Note
Component description
4A 600V
0.47uF, 305V
100nF,50V(0603)
1nF, 63V
2200uF, 25V
68nF, 63V
220uF, 25V
470pF, 50V(0603)
0.33uF, 305V
120uF, 400V
10nF, 400V
2.2nF, 250V
47pF, 1kV
10uF, 35V
UF4006
MBR20H150CT
1N4148
2A 250V
ICE3AS03LJG, SO-8
SFH617 A3
TL431
Jumper
27mH, 1.7A
3.3mH,1.8A
1.5uH
470k(B57891M0474+000)
SPA07N60C3
BC807-25
BC817-25
33K, 2W
0.47R, 1/2W,1%
0.51R, 1/2W,1%
24k, 1%, 1/4W
470R, 1%, 1/4W
3.6k, 1%, 1/4W
0R, 0603
39k,0603
1.2k, 0603
820R
100R, 1/4W
10R, (0603)
9R1, 1/4W
110k,1%
27k, (0603),1%
100k(0603)
62k,1%
98uH(P=24,S=5,A=4)
24V
14
Quantity
1
1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
12
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
Manufacturer
Vishay
EPCOS
Murata
Murata
EPCOS
EPCOS
EPCOS
Murata
Murata
EPCOS
Vishay
Vishay
Vishay
Infineon
Vishay
EPCOS
EPCOS
NEC-Tokin
EPCOS
Infineon
TDK
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
9 Transformer Construction
Core and material: EER28L, PC47 or EER28/34/11, N72
Bobbin: EER28LEC P12 (Vertical type)
Primary Inductance, Lp = 98uH measured between pin 1 and pin 3 (Gapped to Inductance)
Transformer structure:
Figure 5 – Transformer structure and top view of transformer complete
Wire size requirement:
Start
Stop
No. of turns
Wire size
Layer
6
5
4
2XAWG#28
Aux.
2
3
12
3XAWG#28
1
11
12
5
6XAWG#26
Secondary
1
2
12
3XAWG#28
1
Application Note
15
/2 Primary
/2 Primary
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
10 Test Results
10.1 Efficiency
Active-Mode Efficiency versus AC Line Input Voltage
90.00
Efficiency [ % ]
88.00
86.4
86.0
86.0
86.7
86.6
85.4
85.1
230
265
86.00
83.9
86.0
84.00
85.8
84.7
82.00
82.3
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
95.00
Efficiency [ % ]
90.00
86.4
87.9
86.9
86.7
85.00
80.00
74.4
86.0
85.5
32.5
48.75
84.7
81.8
75.00
71.0
70.00
65.00
0
16.25
65
Output Power
[W]
Vin=115Vac
Vin=230Vac
Figure 7 – Efficiency vs. Output Power @ Low and High Line
Application Note
16
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
10.2 Input Standby Power
Standby Power @ no-load versus AC Line Input Voltage
100
Input Power [ mW ]
90.10
90
84.30
75.36
80
70
72.27
68.07
69.55
85
115
60
150
180
230
265
AC Line Input Voltage [ Vac ]
Po = 0W
Figure 8 – Input Standby Power @ no load vs. AC Line Input Voltage
(Equipment: Yokogawa WT210 power meter – using integration mode)
Standby Pow er @ 0.5W load versus AC Line Input Voltage
Input Power [ W ]
0.80
0.70
0.67
0.68
85
115
0.68
0.71
0.72
230
265
0.69
0.60
150
180
AC Line Input Voltage [ Vac ]
Po=0.5W
Figure 9 – Input Standby Power @ 0.5W load vs. AC Line Input Voltage
(Equipment: Yokogawa WT210 power meter – using integration mode)
Application Note
17
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
Standby Pow er Efficiency @ 0.5W load versus AC Line Input Voltage
80
74.67
74.38
Efficiency [ % ]
75
73.62
72.98
71.02
70.33
70
65
AC Line Input Voltage [ Vac ]
Pout=0.5W
Figure 10 – Standby Power Efficiency @ 0.5W load vs. AC Line Input Voltage
10.3 Line Regulation
Output Voltage [ V ]
Line Regulation : Output Voltage @ Full Load versus AC Line Input Voltage
20.50
20.00
19.53
19.53
19.53
19.53
19.53
19.53
85
115
150
180
230
265
19.50
19.00
18.50
AC Line Input Voltage [ Vac ]
Vo @ full load
Figure 11 – Line Regulation vs. AC Line Input Voltage
Application Note
18
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
10.4 Load Regulation
Load Regulation: Vout versus Outoput Power
Ouput Voltage [ V ]
20.00
19.80
19.67
19.60
19.65
19.67
19.63
19.65
19.58
19.63
19.53
19.58
19.40
19.53
19.20
19.00
0
16.25
32.5
48.75
65
Output Pow er [ W ]
Output Voltage @ 230Vac
Output Voltage @ 115Vac
Figure 12 – Load Regulation vs. AC Line Input Voltage
10.5 Max. Overload Output Power
Max. Overload Output & Input Pow er ( Peak Pow er ) versus AC Line Input Voltage
Max. Overload Output Power [ W ]
Pin=94.70±3.6% & Pout=80.18±5.1%
100
95
90
85
80
75
70
95.7
93
76.08
85
91.29
76.91
115
92.95
91.76
82.19
79.75
78.23
150
180
230
98.12
84.28
265
AC Line Input Voltage [ V ]
Peak Output Power
Peak Input Power
Figure 13 – Overload Output Power (Over Current Shut Off Threshold) vs. AC Line Input Voltage
Application Note
19
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
10.6
ESD
Pass (EN61000-4-2) 20kV for contact discharge.
10.7
Lightning Surge
Pass* (EN61000-4-5) 6kV for line to earth.
*Add SG1 & SG2 (DSP-301N-S008)
10.8
Conducted EMI test
The conducted EMI was measured by Schaffner (SMR4503) and followed the test standard of EN55022
class B. The demo board was set up at maximum load with input voltage of 115Vac and 230Vac.
80
EN_V_QP
EN_V_AV
QP
AV
70
60
50
dBµV
40
30
20
10
0
-10
0.1
1
10
100
-20
f / MHz
Figure 14 – Max. Load (65W) with 115 Vac (Neutral)
80
EN_V_QP
EN_V_AV
QP
AV
70
60
50
dBµV
40
30
20
10
0
-10
0.1
1
10
100
-20
f / MHz
Figure 15 – Max. Load (65W) with 230 Vac (Neutral)
Application Note
20
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
11 Waveforms and Scope Plots
All waveforms and scope plots were recorded with a LeCroy 6050 oscilloscope
11.1 Startup waveforms @ full load
0.23s
0.23s
10ms
10ms
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
Startup time = 0.23s, Soft start time = 10ms
Startup time = 0.23s, Soft start time = 10ms
Figure 16 – Startup @ Vin=85Vac and 65W load
Figure 17 – Startup @ Vin=265Vac and 65W load
11.2 Drain-Source voltage and current @ full load
Channel 1; C1 : Drain Source Voltage (VDS)
Channel 2; C2 : Drain Source Current (IDS)
Channel 1; C1 : Drain Source Voltage (VDS)
Channel 2; C2 : Drain Source Current (IDS)
Duty cycle = 41.6%
Duty cycle = 10.7%
Figure 18 – Operation @ Vin = 85Vac and 65W
load
Figure 19–Operation @ Vin = 265Vac and 65W
load
Application Note
21
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
11.3 Frequency jittering
Channel 1; C1 : Drain Source voltage (VDS)
Channel 1; C1 : Drain Source voltage (VDS)
Frequency changing from 95.6kHz ~ 102kHz, Jitter
period is set at 4ms internally
Frequency changing from 95.6kHz ~ 102kHz, Jitter
period is set at 4ms internally
Figure 20 –
Figure 21 –
Frequency change shown at
VDS @
Vin=85Vac
and 65W Load
Frequency change shown at
Vin=265Vac and 65W Load
VDS
@
11.4 Load transient response (Load jump from 10% to 100%)
Channel 2; C1 : Output Current (IO)
Channel 2; C2 : Output Voltage (VO)
Channel 2; C1 : Output Current (IO)
Channel 2; C2 : Output Voltage (VO)
Vripple_pk_pk= 294mV(Load 10% to 100%,100Hz,0.4A/µS slew rate),
No Oscillation
Vripple_pk_pk= 294mV(Load 10% to 100%,100Hz,0.4A/µS slew
rate), No Oscillation
Figure 22– Load jump @ Vin=85Vac from 10% to 100%
Figure 23 – Load jump @ Vin=265Vac from 6W to 60W load
Application Note
22
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
11.5 Output ripple voltage @ Full Load
Channel 2; C2 : Output Ripple Voltage (VO)
Channel 2; C2 : Output Ripple Voltage (VO)
Vripple_pk_pk= 127mV (Probe terminal end with decoupling
capacitor of 0.1uF(ceramic) + 1uF(Electrolytic),20MHz)
Vripple_pk_pk= 127mV (Probe terminal end with decoupling
capacitor of 0.1uF(ceramic) + 1uF(Electrolytic),20MHz)
Figure 24 – Output voltageripple @ 85Vac and
65W load
Figure 25 – Output voltageripple @ 265Vac and
65W load
11.6 Output ripple voltage during burst mode @ 1W Load
Channel 2; C2 : Output Ripple Voltage (VO)
Channel 2; C2 : Output Ripple Voltage (VO)
Vripple_pk_pk= 57mV (Probe terminal end with decoupling capacitor
of 0.1uF(ceramic) + 1uF(Electrolytic),20MHz)
Vripple_pk_pk= 73.4mV (Probe terminal end with decoupling
capacitor of 0.1uF(ceramic) + 1uF(Electrolytic),20MHz)
Figure 26 – Output ripple voltage @ Vin=85Vac and
1W load
Figure 27 – Output ripple voltage @ Vin=265Vac
and 1W load
Application Note
23
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
11.7 Active burst mode @ 1W load
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
Load change from 3.34A to 0.5A, blanking time to
enter burst mode is 20ms
Figure 28 – Active burst mode @ Vin=85Vac
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
Load change from 3.34A to 0.5A, blanking time to
enter burst mode is 20ms
Figure 29 – Active burst mode @ Vin=265Vac
11.8 Vcc overvoltage protection - Latched Off
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
R16 disconnected during system operating at 0.5A load,System
enters to latched off mode due to Vcc OVP
R16 disconnected during system operating at 0.5A load,System
enters to latched off mode due to Vcc OVP
Figure 30 – Vcc overvoltage protection @ Vin=85Vac
Figure 31 – Vcc overvoltage protection @ Vin=265Vac
Application Note
24
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
11.9 External protection enable (Mosfet OTP) – Latched Off
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
DUT is operating at full load and ambient is 80°C, system enters
latch off mode when VBL <0.33 (measured heatsink temperature
is 103°C & mosfet surface temperature is 107°C)
Figure 32 – External latch off enable(Mosfet OTP)@ 85Vac
DUT is operating at full load and ambient is 80°C, system enters
latch off mode when VBL <0.33 (measured heatsink temperature
is 103°C & mosfet surface temperature is 107°C)
Figure 33 – External latch off enable(Mosfet OTP) @ 265Vac
Application Note
25
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
11.10 Over load protection without/with extended blanking time-Auto Restart
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
Step load from 3.34 to 4.5A, system enters to auto restart mode
when VFB > 4.2V and
VBL > 4.0V and 20ms blanking
time(Cbl=100pF)
Step load from 3.34 to 4.5A, system enters to auto restart mode
when VFB > 4.2V and
VBL > 4.0V and 20ms blanking
time(Cbl=100pF)
Figure 34
Figure 35–
– Overload protection without extended blanking
Overload protection without extended blanking
time @ 85Vac
time @ 265Vac
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
Step load from 3.34 to 4.5A, system enters to auto restart mode
when VFB > 4.2V and VBL > 4.0V and 72ms blanking time
Step load from 3.34 to 4.5A, system enters to auto restart mode
when VFB > 4.2V and VBL > 4.0V and 72ms blanking time
Figure 36 – Overload protection with extended blanking time
@ 85Vac(Cbl=0.22µF)
Figure 37–
Application Note
26
Overload protection with extended blanking time
@ 265Vac(Cbl=0.22µF)
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
11.11 Open loop protection – Auto Restart
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
R16 disconnected during system operating at 3.34A load, system
enters to auto restart mode when VFB > 4.2V and VBL > 4.0V and
20ms blanking time (Over load protection)
R16 disconnected during system operating at 3.34A load,
system enters to auto restart mode when VFB > 4.2V and VBL >
4.0V and 20ms blanking time (Over load protection)
Figure 38 – Open loop protection @ 85Vac
Figure 39 – Open loop protection @ 265Vac
11.12 Vcc under voltage/Short optocoupler – Auto Restart
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL Voltage (VBL)
Shorting the transistor of the opto-coupler(IC2), System enters to
Auto Restart mode when Vcc<10.5V
Shorting the transistor of the opto-coupler(IC2), System enters
to Auto Restart mode when Vcc<10.5V
Figure 40 – Vcc under voltage/Short optocoupler protection @
Figure 41
85Vac
@ 265Vac
Application Note
27
– Vcc under voltage/Short optocoupler protection
2009-05-15
65W 19.5V Demoboard using ICE3AS03LJG on board
12 References
[1]
Infineon Technologies, Datasheet “F3 PWM controller ICE3AS03LJG Off-Line SMPS Current Mode
Controller with Integrated 500V Startup Cell (Latched and Frequency Jitter Mode)”
[2]
Infineon Technologies, Application Note “AN-SMPS-ICE2xXXX-1 CoolSETTM ICE2xXXX for OFFLine Switch Mode Power Supply (SMPS)”
[3]
Infineon Technologies, Application Note “ICE3BS03LJG F3 Fixed Frequency PWM Controller (Latch
& Jitter version) Design Guide”
Application Note
28
2009-05-15
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