Download here

Application Note, V1.0, Nov 2007
AN-EVALSF3-ICE3BS03LJG
60W 16V SMPS Evaluation Board with F3
controller ICE3BS03LJG
Power Management & Supply
N e v e r
s t o p
t h i n k i n g .
Edition 2007-11-14
Published by Infineon Technologies Asia Pacific,
168 Kallang Way,
349253 Singapore, Singapore
© Infineon Technologies AP 2007.
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.
60W 16V Demo board using ICE3BS03LJG on board
Revision History:
Previous Version:
Page
2007-11
V1.0
none
Subjects (major changes since last revision)
60W 16V SMPS Evaluation Board with F3 controller ICE3BS03LJG:
License to Infineon Technologies Asia Pacific Pte Ltd
Kyaw Zin Min
Kok Siu Kam Eric
We Listen to Your Comments
Any information within this document that you feel is wrong, unclear or missing at all?
Your feedback will help us to continuously improve the quality of this document.
Please send your proposal (including a reference to this document) to:
[email protected]
AN-PS0015
60W 16V Demo board using ICE3BS03LJG 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 .................................................................................................................................9
Component side component legend .............................................................................................9
Solder side copper & component legend ......................................................................................9
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
Clamper circuit............................................................................................................................11
Main switcher..............................................................................................................................11
Gate drive ...................................................................................................................................11
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
Test Results ..............................................................................................................................16
Efficiency ....................................................................................................................................16
Input Standby Power ..................................................................................................................17
Line Regulation...........................................................................................................................18
Load Regulation .........................................................................................................................19
Max. Overload Output Power......................................................................................................19
11
11.1
11.2
11.3
11.4
11.5
11.6
11.7
11.8
11.9
11.10
11.11
Waveforms and Scope Plots....................................................................................................20
Startup @ Low and High AC Line Input Voltage and 60W load ..................................................20
Drain Source Voltage and Current during 60W load Operation...................................................20
Load Transient Response (Load jump from 10% to 100% Load)................................................21
AC Output Ripple during 60W.....................................................................................................21
Active Burst Mode @ 0.5W load .................................................................................................22
Over load protection – Auto Restart............................................................................................23
Open loop protection – Auto Restart...........................................................................................24
Short optocoupler – Auto Restart................................................................................................24
Vcc overvoltage protection - Latched Off ....................................................................................25
External latched off enable .........................................................................................................25
Frequency Jittering .....................................................................................................................26
12
12.1
Appendix ...................................................................................................................................27
Slope compensation for CCM operation .....................................................................................27
13
References ................................................................................................................................27
Application Note
4
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
1 Abstract
This document is an engineering report that describes a universal input power supply designed in a 16V 60W
off line flyback converter that utilizes the F3 controller ICE3BS03LJG. The application board is operated in
discontinuous current mode and running at 65 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 ICE3BS03LJG 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 concept can prevent the IC from
entering the auto restart mode due to over load protection unintentionally. The outstanding propagation delay
compensation feature can allow a very precise current limit between low line and high line. 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 the
less severe case such as the over load, open loop, short opto-coupler, etc, it enter 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 1a – EVALSF3-ICE3BS03LJG (top view)
Application Note
5
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
Figure 1b – EVALSF3-ICE3BS03LJG (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
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
3 List of Features
500V Startup Cell
Active Burst Mode for lowest Standby Power
Fast load jump response in Active Burst Mode
65kHz internally fixed switching frequency
Frequency jitter and soft gate driving for low EMI
Max Duty Cycle 75%
Overall tolerance of Current Limiting < ±5%
Internal PWM Leading Edge Blanking
BiCMOS technology provide wide VCC range
Built-in Soft Start
Built-in blanking window with extendable blanking time for short duration high current
Built-in latched Off Protection Mode for Over temperature, Over Voltage & Short Winding
Auto Restart Protection Mode for Over load, Open Loop & VCC Undervoltage
External latch enable function
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
16V +/- 2%
Output current
3.75A
Output power
60W
Efficiency
>80% at full load
Output ripple voltage
< 100mVp-p ( exclude high frequency spike )
Application Note
7
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
5 Circuit Diagram
C5
2.2nF
Y1
FUSE1
2A
39mH 1.4A
L1
AC
85V - 265V
AC
NTC 2.5Ohm
RT1
1M 275V
R24 0.22uF
C1
VAR1
0.25W
275V
400V
10n
C4
2A 800V
BR1
400V
150uF
C3
C2
2W
33k
R1
MUR1520
11
1
35V
1000uF
C6
2
C7
1000uF
35V
D1
UF4006
0.22uF
275V
3
R25
1M
16V/3. 75A
L2
1uH
D2
10
C8
220uF
25V
Gnd
0.5W
0.56
R8
R8A
0.56 0.5W
C11
22uF
50V
D3
1N4148
ZD1
24V
7
C12
0.1uF
5
VCC
1
C13
100pF
R11
47 R10 100
BL
IC1
Q1
SPA07N60C3
5
R9
3R3
HV
Gate
ICE3BS03LJG
GND
FB
CS
8
2
3
4
R14
0R
6
R2
22K, 1%
R6
1K
ER28L/N87/154uH
T1
C10
2.7nF
R7
750
R5
10K
C15
220pF
IC2
IC3
TL431
Demo board 60W, 16V SMPS using ICE3BS03LJG and SPA07N60C3
R3
1.2K, 1%
C9
0.68uF
R4
4.3K, 1%
Figure 2 – 60W 16V ICE3BS03LJG power supply Schematic
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 C12, C13, C15 and opto-coupler ground.
• Vcc ground includes the Vcc capacitor ground, C11 and the auxiliary winding ground; pin 6 of the
power transformer.
• Current Sense resistor ground includes current sense resistor R8 and R8A.
Application Note
8
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG 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 4 – Solder side copper – View from Component Side
Application Note
9
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
Figure 5 – Solder side component legend – View from Component Side
Application Note
10
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
7 Circuit Description
7.1
Introduction
The EVALSF3-ICE3BS03LJG demo board is an off line flyback switch mode power supply (SMPS) using the
ICE3BS03LJG PWM IC from the Infineon PWM controller. The circuit, shown in Figure 2, details a 16V, 60W
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 FUSE1 as over-current protection. The common mode choke L1,
X2-capacitors C1 and C2 and Y1-capacitor C5 act as radio interference suppressors. A varistor VAR1 is
added to absorb the line transient while a NTC, RT1 is added to reduce the inrush surge current during start
up. Two series resistor, R24 and R25 are added to discharge the voltage at C1 and C2 after the AC line is
removed. A rectified DC voltage (100V ~ 380V) 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 ICE3BS03LJG, 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
ICE3BS03LJG, the startup cell will charge up the Vcc capacitor C11 and C12. 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 C11 and C12. Resistor R10 is used for current limiting. In order not to
exceed the maximum voltage at Vcc pin, an external zener diode ZD1 is added to clamp the voltage.
7.5
Soft start
The Soft-Start time is built-in 20ms. After the Vcc hits UVLO at 18V, it starts the soft-start phase.
7.6
Clamper circuit
The circuit R1, C4 and D1 clamp the DRAIN voltage spike caused by transformer leakage inductance to a
safe value below the drain source 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 can be added to the MOSFET to reduce the switching noise so as to get a better EMI
performance.
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 can be added in parallel with the gate drive resistor, R13.
Application Note
11
2007-11-14
6060
7.9
60W/16V Demoboard using ICE3BS03LJG on board
Peak current control of primary current
The power MOSFET drain source current is sensed via external shunt resistors R8 and R8A which
determine the tolerance of the current limit control. Since ICE3BS03LJG 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, a 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% (refer to Figure 12).
7.10 Output Stage
The power is coupled to the secondary side through an ultra fast recovery diode D2. The capacitor C6 and
C7 provide energy buffering and the cascading LC filter L2 and C8 is used to reduce the output voltage
ripple. The capacitor C6 and C7 are 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 C9, C10, R2, R3 and R5 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 R6 and R7. Optocoupler IC2 is used to transmit the control signal to the
“Feedback” input of the ICE3BS03LJG 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, C13 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 C13
from 0.9V to 4.0V. Thus the overall blanking time is the addition of 20ms and the extended time. For
example, C13 (external capacitor at BL pin) = 0.1uF, IBK (internal charging current) = 13uA
Blanking time (total) = 20ms + C13 X (4-0.9)/IBK = 43.9ms
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.
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 4V. 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.
Application Note
12
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
7.14 Jitter mode
The ICE3BS03LJG has frequency jittering feature to reduce the EMI noise. The jitter frequency is internally
set at 65 kHz (+/-2.6 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. ICE3BS03LJG 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 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 < 0.25V
Latch off
Over-load / Open loop
VFB > 4.0V 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
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
8 Component List
Item
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
Circuit code
BR1
C1
C10
C11
C12
C13
C15
C2
C3
C4
C5
C6
C7
C8
C9
D1
D2
D3
FUSE1
IC1
IC2
IC3
J1 ~ J12
L1
L2
Q1
R1
R10
R11
R14
R2
R24
R25
R3
R4
R5
R6
R7
R8
R8A
R9
RT1
T1
VAR1
ZD1
Application Note
Part Type
2A 800V
0.22uF, 275V
2.7nF,63V
22uF, 50V
0.1uF, 63V
100pF, 63V
220pF, 63V
0.22uF, 275V
150uF, 400V
10n, 400V
2.2nF, 250V
1000uF, 35V
1000uF, 35V
220uF, 25V
0.68uF, 63V
UF4006
MUR1520
1N4148
4A 250V
ICE3BS03LJG, SO-8
SFH617
TL431
Jumper
39mH, 1.4A
1uH
SPA07N60C3
33K, 2W
100R, 1/4W
47R, 1/4W
0R, 0603
22K, 1%, 1/4W
1M, 1206
1M , 1206
1.2K, 1%, 1/4W
4.3K, 1%, 1/4W
10K, 1/4W
1K, 1/4W
750R, 1/4W
0.56R, 1/2W
0.56R, 1/2W
3R3, 1/4W
NTC 2.5Ohm
ER28L,N87, Lp=154uH
0.25W 275V
24V 0.5W
14
Quantity
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
12
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
9 Transformer Construction
Core and material : ER28, N87 or EER28L, PC40
Bobbin: Vertical type
Primary Inductance, Lp = 154uH measured between pin 3 and pin 1 (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
2
3
12
3x0.3mm ( AWG#28 )
½ Primary
6
5
4
8X0.3mm ( AWG# 28)
Auxiliary
9
11
5
6X0.4mm ( AWG#26 )
Secondary
1
2
12
3x0.3mm ( AWG#28 )
½ Primary
Application Note
15
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
10 Test Results
10.1 Efficiency
Efficiency versus AC Line Input Voltage
90
Efficiency [ % ]
88
86
84
82
80
78
76
50
100
150
200
250
300
AC Line Input Voltage [ Vac ]
Efficiency @ 60W output Power
Figure 6 – Efficiency vs. AC Line Input Voltage
Efficiency versus Output Power
90
Efficiency [ % ]
85
80
75
70
65
60
0
10
20
30
40
50
60
Output Pow er [ W ]
Vin=85VAc
Vin=265VAc
Figure 7 – Efficiency vs. Output Power @ Low and High Line 50Hz
Application Note
16
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
10.2 Input Standby Power
Stanby Power @ no-load versus AC Line Input Voltage
110
95.54
100
85.81
Input Power [ mW ]
90
80
69.09
70
53.84
60
58.68
63.32
50
49.27
40
49.33
49.09
58.48
54.87
50.14
30
20
50
100
150
200
250
300
AC Line Input Voltage [ Vac ]
Po = 0W, no R24 & R25
Po = 0W, R24=R25=1MOhm
Figure 8 – Input Standby Power @ no load vs. AC Line Input Voltage
( Equipment : Yokogawa WT210 power meter – using integration mode )
Standby Power @ 0.3W & 0.5W load vs AC Line Input voltage
(R24=R25=1Mohm)
0.75
0.70
0.66
0.65
0.67
0.71
0.69
0.67
Input Power [ W ]
0.65
0.60
0.55
0.50
0.45
0.42
0.42
0.47
0.45
0.45
0.43
0.40
0.35
50
100
150
200
250
300
AC Line Input Voltage [ Vac ]
Po=0.5W
Po=0.3W
Figure 9 – Input Standby Power @ 0.3W & 0.5W load vs. AC Line Input Voltage
( Equipment : Yokogawa WT210 power meter – using integration mode )
Application Note
17
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
Standby Power Efficiency @ 0.3W & 0.5W load vs Input voltage
(R24=R25=1Mohm)
80
76.54
78
75.31
Efficiency [% ]
76
74
72.17
70.98
72
74.70
74.26
72.21
70.14
69.50
70
67.47
66.42
68
66
64.02
64
62
60
50
100
150
200
250
300
AC Line Input Voltage [ Vac ]
Po=0.5W
Po=0.3W
Figure 10 – Standby Power Efficiency @ 0.3W & 0.5W load vs. AC Line Input Voltage
10.3 Line Regulation
Line Regulation : Vo versus AC Line Input Voltage @ 60W load
O u tp u t Vo ltag e [ V ]
16.5
16
15.5
15
14.5
14
50
100
150
200
250
300
AC Line Input Voltage [ Vac ]
Vo
Figure 11 – Line Regulation vs. AC Line Input Voltage
Application Note
18
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
10.4 Load Regulation
Load Regulation: Vout versus Load @ Vin = 230Vac
Ouput Voltage [ V ]
16.50
16.00
15.50
15.00
14.50
14.00
0
10
20
30
40
50
60
Output Pow er [ W ]
Output Voltage
Figure 12 – Load Regulation vs. AC Line Input Voltage
10.5 Max. Overload Output Power
Max. Overload Output Power ( Peak Power ) versus AC Line Input
Voltage
M ax. O verlo ad O u tp u t
Po w er [ W ]
79
77
75
72.05
73
73.32
74.11
75.72
74.60
76.51
71
69
67
50
100
150
200
250
300
AC Line Input Voltage [ V ]
Peak Output Power
Po_max = 74.28V±3%
Figure 13 – Overload Output Power (Over Current Shut Off Threshold) vs. AC Line Input Voltage
Application Note
19
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
11 Waveforms and Scope Plots
All waveforms and scope plots were recorded with a LeCroy 6050 oscilloscope
11.1 Startup @ Low and High AC Line Input Voltage and 60W 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 )
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 = 0.58s, Soft start time = 18ms
Startup time = 0.58s, Soft start time = 18ms
Figure 14 – Startup @ Vin=85Vac and 60W load
Figure 15 – Startup @ Vin=265Vac and 60W load
11.2 Drain Source Voltage and Current during 60W load Operation
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 = 44.1%
Duty cycle = 9.7%
Figure 16 – Operation @ Vin = 85Vac and 60W load
Figure 17–Operation @ Vin = 265Vac and 60W load
Application Note
20
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
11.3 Load Transient Response (Load jump from 10% to 100% Load)
Channel 1; C1 : Output Voltage (Vo)
Channel 2; C2 : Output Current (Io)
Channel 1; C1 : Output Voltage (Vo)
Channel 2; C2 : Output Current (Io)
Current step slew rate = 0.4A/us
Current step slew rate = 0.4A/us
Figure 18– Load jump @ Vin=85Vac from 6W to 60W load
Figure 19 – Load jump @ Vin=265Vac from 6W to 60W load
11.4 AC Output Ripple during 60W
Channel 1; C1 : Output Ripple Voltage (Vo_ripple)
Channel 1; C1 : Output Ripple Voltage (Vo_ripple)
Vo_ripple = +/-10mV ( exclude high frequency ripple )
Vo_ripple = +/-10mV ( exclude high frequency ripple )
Terminal with decoupling capacitor of 0.1uF + 1uF
Terminal with decoupling capacitor of 0.1uF + 1uF
Figure 20 – AC output ripple @ Vin=85Vac and 60W load
Figure 21 – AC output ripple @ Vin=265Vac and 60W load
Application Note
21
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
11.5 Active Burst Mode @ 0.5W load
Channel 2; C2 : Drain Source Voltage (VDS)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : Current Sense Voltage (VCS)
Blanking time to enter burst mode : 18ms
Figure 22 – Active burst mode @ Vin=85Vac and
step from 3.75A to 0.03A
Channel 2; C2 : Drain Source Voltage (VDS)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : Current Sense Voltage (VCS)
Blanking time to enter burst mode : 18ms
Figure 23 – Active burst mode @ Vin=265Vac
and step from 3.75A to 0.03A
Channel 1; C1 : Output Voltage (Vo)
Output ripple : app. 100mV
Figure 24 – Output ripple at active burst mode @
Vin=85Vac and 0.5W load
Channel 1; C1 : Output Voltage (Vo)
Output ripple : app. 100mV
Figure 25 – Output ripple at active burst mode @
Vin=265Vac and 0.5W load
Application Note
22
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
11.6 Over load protection – Auto Restart
Channel 1; C1 : Output Voltage (Vo)
Channel 2; C2 : Output current (Io)
Channel 3; C3 : Feedback Voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
Blanking time to enter auto-restart mode : 18ms
Figure 26 – Over load protection without extended blanking
Channel 1; C1 : Output Voltage (Vo)
Channel 2; C2 : Output current (Io)
Channel 3; C3 : Feedback Voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
Blanking time to enter auto-restart mode : 18ms
Figure 27 – Over load protection without extended blanking
time; without C13 @ Vin=85Vac and output power step from 3.75A
to 5A load
Time; without C13 @ Vin=265Vac and output power step from
3.75A to 5A load
Channel 1; C1 : Output Voltage (Vo)
Channel 2; C2 : Output current (Io)
Channel 3; C3 : Feedback Voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
Blanking time to enter auto-restart mode : 44ms
Figure 28 – Over load protection with extended blanking
Channel 1; C1 : Output Voltage (Vo)
Channel 2; C2 : Output current (Io)
Channel 3; C3 : Feedback Voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
Blanking time to enter auto-restart mode : 44ms
Figure 29 – Over load protection with extended blanking time;
time;C13 = 0.1uF @ Vin=85Vac and output power step from 3.75A
to 5A load
C13 = 0.1uF @ Vin=265Vac and output power step from 3.75A to
5A load
Application Note
23
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
11.7 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)
System enters auto-restart when VFB>4V, VBL >4V
with defined blanking time 20mS.
System enters auto-restart when VFB>4V, VBL >4V
with defined blanking time 20mS.
Figure 30
Figure 31 –
– Open loop protection @ Vin=85Vac; R2
disconnected before system start up at 60W load
Open loop protection @ Vin=85Vac; R2
disconnected before system start up at 60W load
11.8 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)
System enters Auto Restart mode when Vcc<10.5V
System enters Auto Restart mode when Vcc<10.5V
Figure 32
Figure 33
– Short optocoupler protection @ Vin=85Vac; Short
the transistor of optocoupler.
Application Note
24
– Short optocoupler protection @ Vin=265Vac; Short
the transistor of optocoupler.
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
11.9 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)
System enters latched off mode when VCC>25.5V
System enters latched off mode when VCC>25.5V
Figure 34
Figure 35 –
– Vcc overvoltage protection @ Vin=85Vac; R2
disconnected at startup with open load
11.10
Vcc overvoltage protection @ Vin=85Vac; R2
disconnected at startup with open load
External latched off enable
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)
System enters latched off mode when Vbl<0.25V
System enters latched off mode when Vbl<0.25V
Figure 36
Figure 37– Latched off enable by trigger BL pin @ Vin=265Vac;
– Latched off enable by trigger BL pin @ Vin=85Vac;
BL pin to 0.2V for 50µS by function generator (without C13).
Application Note
25
BL pin to 0.2V for 50µS by function generator (without C13).
2007-11-14
6060
11.11
60W/16V Demoboard using ICE3BS03LJG on board
Frequency Jittering
Channel 1; C1 : Drain Source voltage (VDS)
Channel 1; C1 : Drain Source voltage (VDS)
Frequency changing from 68.6kHz ~ 73.2kHz, Jitter
period is set at 4ms internally ( taken from untrimmed
sample )
Frequency changing from 68.7kHz ~ 73.4kHz, Jitter
period is set at 4ms internally ( taken from untrimmed
sample )
Figure 38 –
Figure 39 –
Frequency change shown at
VDS
@ Vin=85Vac
and 60W Load
Application Note
Frequency change shown at
VDS @
Vin=265Vac
and 60W Load
26
2007-11-14
6060
60W/16V Demoboard using ICE3BS03LJG on board
12 Appendix
12.1 Slope compensation for CCM operation
This demo board is designed in Discontinuous Conduction Mode (DCM) operation. If the application is
designed in Continuous Conduction Mode (CCM) operation where the maximum duty cycle exceeds the 50%
threshold, it needs to add the slope compensation network. Otherwise, the circuitry will be unstable. In this
case, three more components (2 ceramic capacitors C17 / C18 and one resistor R19) are needed to add as
shown in the circuit diagram below.
Figure 40 – Circuit Diagram Switch Mode Power Supply with Slope Compensation
More information regarding how to calculate the additional components, see in the application note
AN_SMPS_ICE2xXXX – available on the internet: www.infineon.com/CoolSET CoolSET F2.
13 References
[1]
Infineon Technologies, Datasheet “F3 PWM controller ICE3BS03LJG Off-Line SMPS Current Mode
Controller with Integrated 500V Startup Cell (Latched and Frequency Jitter Mode)”
[2]
Infineon Technologies, Application Note “ICE3xS03LJG Current Mode Controller with integrated
500V Startup Cell”
[3]
Infineon Technologies, Application Note “AN-SMPS-ICE2xXXX-1 CoolSETTM ICE2xXXX for OFFLine Switch Mode Power Supply (SMPS)”
Application Note
27
2007-11-14
Similar pages