65W 19.5V Evaluation Board using ICE3GS03LJG

Application Note, V1.0, Dec 2011
AN-EVAL3GS03LJG
65W 19.5V SMPS Evaluation Board with
F3 PWM controller ICE3GS03LJG
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
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 ICE3GS03LJG on board
Revision History:
Previous Version:
Page
2011-12
none
Subjects (major changes since last revision)
65W 19.5V SMPS Evaluation Board with F3 PWM controller ICE3GS03LJG:
License to Infineon Technologies Asia Pacific Pte Ltd
Kyaw Zin Min
Kok Siu Kam Eric
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V1.0
AN-PS0060
65W 19.5V Demo board using ICE3GS03LJG on board
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 5.14 5.15 Circuit Description ........................................................................................................................ 7 Introduction...................................................................................................................................... 7 Line Input......................................................................................................................................... 7 Start up ............................................................................................................................................ 7 Operation mode .............................................................................................................................. 7 Soft start .......................................................................................................................................... 7 RCD Clamper circuit ....................................................................................................................... 7 Main switcher .................................................................................................................................. 7 Gate drive ........................................................................................................................................ 7 Peak current control of primary current........................................................................................... 8 Output Stage ................................................................................................................................... 8 Feedback and regulation................................................................................................................. 8 Blanking Window for Load Jump .................................................................................................... 8 Active Burst Mode ........................................................................................................................... 8 Jitter mode....................................................................................................................................... 9 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 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 (Latch off) .......................................................................................... 25 External protection enable (Latch off) ........................................................................................... 25 Over load protection (built-in + extended blanking time) (Auto restart) ........................................ 26 Open loop protection (Auto restart) ............................................................................................... 26 VCC under voltage/Short optocoupler protection (Auto restart) ..................................................... 27 12 References ................................................................................................................................... 27 Application Note
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65W 19.5V Demoboard using ICE3GS03LJG 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 ICE3GS03LJG. The application board is
operated in discontinuous current mode (DCM) and is running at 130 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 ICE3GS03LJG 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, Vcc under-voltage & short opto-coupler,
it enters the auto restart protection mode. In case it needs customer defined protection, the external latch off
enable feature can fulfill the requirement.
2 Evaluation Board
Figure 1 – EVAL3GS03LJG
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
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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
130 kHz internally fixed switching frequency
Built-in Latched Off Protection Mode for Overtemperature, Overvoltage & Short Winding
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
Output voltage and current
19.5V +/- 2%
Output current
3.34A
Output power
65W
Average Efficiency
>82% (115Vac & 230Vac)
Output ripple voltage
< 100mVp-p
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5 Circuit Description
5.1 Introduction
The EVAL3GS03LJG demo board is an off line flyback switch mode power supply (SMPS) using the
ICE3GS03LJG PWM IC from the Infineon PWM (fixed frequency) 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.
5.2 Line Input
The AC input side comprises the input fuse F1 as over-current protection. The common mode choke L11 and
L12, X-capacitors C11 and C14 and Y-capacitor C12 act as EMI suppressors. A varistor VAR (optional) is
added to absorb the line transient while a NTC (optional) is added to reduce the inrush surge current during
start up. A rectified DC voltage (120V ~ 375V) 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 ICE3GS03LJG, 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
ICE3GS03LJG, the startup cell will charge up the Vcc capacitor C16 and C110. 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 and filtering capacitors C16 and C110. Resistor R12 is used for current limiting. In order not to
exceed the maximum voltage at Vcc pin, an external zener diode ZD11 (optional) and R13 (optional) is
added to clamp the voltage.
5.5 Soft start
The Soft-Start time is built-in 10ms. After the Vcc hits UVLO at 18V, it starts the soft-start phase.
5.6 RCD Clamper circuit
While turning off the switch Q11, the clamper circuit R11, C15 and D11 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.
5.7 Main switcher
Q1 is the main switcher for the system. It has a low Rdson to reduce the conduction loss. A drain-source
capacitor C111 is added to the MOSFET to reduce the switching noise so as to get a better EMI
performance.
5.8 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 diode
(D13) is added in parallel with the gate drive resistor (R16) so as to turn the device off faster than it is turned
on.
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5.9 Peak current control of primary current
The power MOSFET drain source current is sensed via external shunt resistors R14 and R15 which
determine the tolerance of the current limit control. Since ICE3GS03LJG 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. +/-4.81% (refer to Figure 12).
5.10 Output Stage
The power is coupled to the secondary side through schottky diode D21. The capacitor C22 provides energy
buffering and the cascading LC filter L21 and C23 is used to reduce the output voltage ripple. The capacitor
C22 is selected to have a low internal resistance (ESR) to minimize the output voltage ripple.
5.11 Feedback and regulation
The output voltage is controlled by a TL431 reference control IC (IC21). This device incorporates the voltage
reference as well as the error amplifier. Compensation network C25, C26, R24, R25, R26, R27 and R28
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 R22 and R23. Optocoupler IC12 is
used to transmit the control signal to the “Feedback” input of the ICE3GS03LJG device. The selected
optocoupler should meet DIN VDE 884 requirements for a wider creepage distance.
5.12 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, C19 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 C19
(CBK=100nF) from 0.9V to 4.0V. Thus the overall blanking time is the addition of 20ms and the extended
time. 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 + 238461.5 * CBK = 43.85ms
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 1.23V, the system will only enter Active Burst Mode after 20ms blanking
time while VFB is still below 1.23V.
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.
5.13 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.
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
Application Note
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65W 19.5V Demoboard using ICE3GS03LJG on board
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.
5.14 Jitter mode
The ICE3GS03LJG has frequency jittering feature to reduce the EMI noise. The jitter frequency is internally
set at 130 kHz (±5.2 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 a must. ICE3GS03LJG 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. 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
9
Protection Mode
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65W 19.5V Demoboard using ICE3GS03LJG on board
6 Circuit Diagram
Figure 2 – 65W 19.5V ICE3GS03LJG power supply schematic
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65W 19.5V Demoboard using ICE3GS03LJG 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, Current sense resistor ground
and EMI return ground. All the split ground should be connected to the bulk capacitor ground
separately.
• Signal ground includes all small signal grounds connecting to the PWM controller GND pin such as
filter capacitor ground of C17, C18, C19, C110 and opto-coupler (IC12) ground.
• Vcc ground includes the Vcc capacitor ground, C16 and the auxiliary winding ground; pin 5 of the
power transformer.
• Current Sense resistor ground includes current sense resistor R14 and R15.
Application Note
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65W 19.5V Demoboard using ICE3GS03LJG on board
7 PCB Layout
7.1 Top side
Figure 3 – Top side component legend
7.2 Bottom side
Figure 4 – Bottom side copper & component legend
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8 Component List
No.
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
Designator
BR1
C11
C12
C13
C14
C15
C16
C18, C26
C22
C23
C25
C19,C110
C111
D11
D12
D13
D21
F1
HS11, HS21
IC11
IC12
IC21
J11,J12,J13,J21,NTC,L22,R17
L N, +19.5V Com
L11
L12
L21
Q11
R11
R12
R14, R15
R16
R22
R23
R24
R26
R27
R28
TR1
Application Note
Component description
KBU4J(600V 4A)
330nF/305V
3.3nF/250V
120uF/400V
100nF/305V
10nF/ 630V
22uF/35V
1.2nF/63V
2200uF/25V
1000uF/25V
150nF/ 63V
100nF/ 63V
150pF/1kV
UF4005(600V, 1A)
1N485B(200V, 0.2A)
1N4148
VF30200C(200V, 30A)
2A/250V
Heat Sink
ICE3GS03LJG
SFH617 A3
TL431
Jumper
Connector
20mH 2A
6.8mH 1.3A
1.5uH,6.3A
650V(0.6Ω, 7.3A)
39k/2W
200R
0.51R(1W, 1%)
47R
820R
1.2k
100k
3.6k/1%
470R/1%
24k/1%
80µH(24:5:4)ER28/17/11
13
Part No.
KBU4J-E4/51
B32922C3334M+***
DE1E3KX332MA4BL01
B43504A9127M00*
B32922A2104+***
Manufacturer
VISHAY
EPCOS
MURATA
EPCOS
EPCOS
DESD33A151KA2B
UF4005
MURATA
VISHAY
VF30200C-E3/4W
VISHAY
ICE3GS03LJG
INFINEON
B82734R2202B030
B82731T2132A020
EPCOS
EPCOS
SPA07N60C3
INFINEON
B66433G0000X172
EPCOS
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65W 19.5V Demoboard using ICE3GS03LJG on board
9 Transformer Construction
Core and material: ER28/17/11 (N72)
Bobbin: BEER28L-1110CPFR (Vertical type)
Primary Inductance, Lp = 80uH (±5%), measured between pin 1 and pin 3 (Gapped to Inductance)
Transformer structure:
1
12
2
11
3
5
6
Figure 5 – Transformer structure and top view of transformer complete
Wire size requirement:
Start
Application Note
Stop
No. of turns
Wire size
Layer
1
2
12
3XAWG#28
1
11
12
5
6XAWG#26
Secondary
2
3
12
3XAWG#28
1
5
6
4
2XAWG#28
14
/2 Primary
/2 Primary
Aux.
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10 Test results
10.1 Efficiency
Figure 6 – Efficiency Vs. AC line input voltage
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)
Figure 9 – Input standby power @ 0.5W, 1W, 2W & 3W Vs. AC line input voltage (measured by
Yokogawa WT210 power meter - integration mode)
Application Note
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10.3 Line regulation
Figure 10 – Line regulation Vout @ full load vs. AC line input voltage
10.4 Load regulation
Figure 11 – Load regulation Vout vs. output power
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10.5 Maximum input power
Figure 12 – Maximum input power (before overload protection) vs. AC line input voltage
10.6 ESD test
Pass (EN61000-4-2): 20kV for contact discharge (without surge absorber device)
10.7 Lightning surge test
Pass (EN61000-4-5): 4kV for line to earth (without surge absorber device)
Pass (EN61000-4-5): 6kV for line to earth (with surge absorber device; SA1 & SA2 (DA38-102MB))
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65W 19.5V Demoboard using ICE3GS03LJG on board
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 (65W) with input voltage of 115Vac and
230Vac.
Figure 13 – Maximum load (65W) with 115 Vac (Line)
Figure 14 – Maximum load (65W) with 115 Vac (Neutral)
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Figure 15 – Maximum load (65W) with 230 Vac (Line)
Figure 16 – Maximum load (65W) 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 maximum load
552ms
552ms
Channel 1; C1 : Drain voltage (VDrain)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
Channel 1; C1 : Drain voltage (VDrain)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
Startup time = 552ms
Startup time = 552ms
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
9.3ms
9.3ms
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
Soft Star time = 9.3ms(32 steps)
Soft Star time = 9.3ms(32 steps)
Figure 19 – Soft Start @ 85Vac & max. load
Figure 20– Soft Start @ 265Vac & max. load
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11.3 Frequency jittering
130kHz
130kHz
138kHz
138kHz
Channel 1; C1 : Drain to source voltage (VDS)
Channel 1; C1 : Drain to source voltage (VDS)
Frequency jittering from 130 kHz ~ 138kHz
Frequency jittering from 130 kHz ~ 138kHz
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 Source Voltage ( VDS )
Channel 2; C2 : Drain Current ( IDS )
Duty cycle = 50%, VDS_peak=308V
Figure 23 – Operation @ Vin = 85Vac and max.
load
Application Note
Channel 1; C1 : Drain Source Voltage ( VDS )
Channel 2; C2 : Drain Current ( IDS )
Duty cycle = 10.5% VDS_peak=588V
Figure 24 – Operation @ Vin = 265Vac and max.
load
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11.5 Load transient response (Dynamic load from 10% to 100%)
Channel 2; C2 : Output Ripple Voltage ( Vo_ripple )
Channel 2; C2 : Output Ripple Voltage ( Vo_ripple )
Vripple_pk_pk=227.4mV (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=225.9mV (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
Figure 26 – Load transient response @ 265Vac
11.6 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=41.8mV
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=43.3mV
Probe terminal end with decoupling capacitor of
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
Figure 28 – AC output ripple @ Vin=265Vac and
max. load
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11.7 Output ripple voltage during burst mode at 1 W load
Channel 2; C2 : Output Ripple Voltage ( Vo_ripple )
Vripple_pk_pk=37.4mV
Probe terminal end with decoupling capacitor
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
Channel 2; C2 : Output Ripple Voltage ( Vo_ripple )
of
Figure 29 – AC output ripple @ 85Vac and 1W load
Vripple_pk_pk = 48.9mV
Probe terminal end with decoupling capacitor of
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
Figure 30 – AC output ripple @ 265Vac and 1W
load
11.8 Entering active burst mode
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
Blanking time to enter burst mode : 19ms (load step
down from 3.34A to 0.051A)
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 : BL voltage (VBL)
Blanking time to enter burst mode : 19ms (load step
down from 3.34A to 0.051A)
Figure 32 – Active burst mode @ Vin=265Vac
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65W 19.5V Demoboard using ICE3GS03LJG on board
11.9 Vcc overvoltage protection (Latch off)
VCC OVP
VCC OVP
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
VCC OVP (R28 disconnected during system
operating at light load)
Figure 33 – Vcc overvoltage protection @ 85Vac
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
VCC OVP (R28 disconnected during system
operating at light load)
Figure 34 – Vcc overvoltage protection @ 265Vac
11.10 External protection enable (Latch off)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
External protection enable (short BL pin to Gnd by
10Ω resistor)
Figure 35 – External protection enable @ 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 : BL voltage (VBL)
External protection enable (short BL pin to Gnd by
10Ω resistor)
Figure 36 – External protection enable @ 265Vac
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65W 19.5V Demoboard using ICE3GS03LJG on board
11.11 Over load protection (built-in + extended blanking time) (Auto restart)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
Over load protection with 42.84ms(19+22.84)
blanking time (output load change from 3.34A to
5A, C19=100nF)
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 : BL voltage (VBL)
Over load protection with 42.84ms(19+22.84)
blanking time (output load change from 3.34A to
5A, C19=100nF)
Figure 38 – Over load protection with
built-in+extended blanking time @ 265Vac
11.12 Open loop protection (Auto restart)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
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 : BL voltage (VBL)
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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65W 19.5V Demoboard using ICE3GS03LJG on board
11.13 VCC under voltage/Short optocoupler protection (Auto restart)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
Channel 1; C1 : Current sense voltage (VCS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
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
12 References
[1]
[2]
[3]
Infineon Technologies, Datasheet “F3 PWM controller ICE3GS03LJG Off-Line SMPS Current Mode
Controller with Integrated 500V Startup Cell (Latched and Frequency Jitter Mode)”
Infineon Technologies, Application Note “AN-SMPS-ICE2xXXX-1 CoolSETTM ICE2xXXX for OFFLine Switch Mode Power Supply (SMPS)”
Infineon Technologies, Application Note “ICE3XS03LJG F3 Fixed Frequency PWM Controller (Latch
& Jitter version) Design Guide”
Application Note
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