30W 16V Evaluation board using ICE3BR0665J

Application Note, V1.1, Aug 2010
AN-EVAL3BR0665J
30W 16V SMPS Evaluation Board with
CoolSET® F3R ICE3BR0665J
Power Management & Supply
N e v e r
s t o p
t h i n k i n g .
Edition 2010-08-11
Published by Infineon Technologies Asia Pacific,
8 Kallang Sector,
349282 Singapore
© Infineon Technologies AP 2008.
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
30W 16V Demoboard using ICE3BR0665J on board
Revision History:
2010-08
Previous Version:
1.0
V1.1
Page
Subjects (major changes since last revision)
1, 5, 7
Change the demo board name to EVAL3BR0665J
®
30W 16V SMPS Evaluation Board with CoolSET F3R ICE3BR0665J:
License to Infineon Technologies Asia Pacific Pte Ltd
Kyaw Zin Min
Kok Siu Kam Eric
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AN-PS0023
30W 16V Demoboard using ICE3BR0665J
Table of Contents
Page
1
Abstract..........................................................................................................................................5
2
Evaluation Board...........................................................................................................................5
3
List of Features .............................................................................................................................6
4
Technical Specifications ..............................................................................................................6
5
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.11
5.12
5.13
Circuit Description ........................................................................................................................7
Introduction......................................................................................................................................7
Line Input.........................................................................................................................................7
Start up............................................................................................................................................7
Operation mode ..............................................................................................................................7
Soft start ..........................................................................................................................................7
RCD Clamper circuit .......................................................................................................................7
Peak current control of primary current...........................................................................................7
Output Stage ...................................................................................................................................8
Feedback and regulation.................................................................................................................8
Blanking Window for Load Jump / Active Burst Mode ....................................................................8
Active Burst Mode ...........................................................................................................................8
Jitter mode.......................................................................................................................................8
Protection modes ............................................................................................................................9
6
Circuit Diagram ...........................................................................................................................10
7
7.1
7.2
PCB Layout ..................................................................................................................................12
Component side component legend .............................................................................................12
Solder side copper & component legend ......................................................................................12
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. Output Power .......................................................................................................................19
ESD Test .......................................................................................................................................20
Lightning Surge Test .....................................................................................................................20
Conducted EMI..............................................................................................................................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......................................................................................................22
Start up at low and high AC line input voltage and 30W load.......................................................22
Soft start at low and high AC line input voltage and 30W load .....................................................22
Frequency jittering.........................................................................................................................23
Drain to source voltage and Current at 30W load.........................................................................23
Load transient response (Load jump from 10% to 100%) ............................................................24
AC output ripple voltage at 30W load ...........................................................................................24
Active burst mode at 0.5W load ....................................................................................................25
Vcc overvoltage protection – Auto Restart....................................................................................26
Over load protection – Auto Restart..............................................................................................27
Open loop protection – Auto Restart.............................................................................................27
Vcc under voltage/Short optocoupler protection– Auto Restart....................................................28
External auto restart enable ..........................................................................................................28
12
12.1
Appendix ......................................................................................................................................29
Slope compensation for CCM operation .......................................................................................29
13
References ...................................................................................................................................29
Application Note
4
2010-08-11
30W 16V Demoboard using ICE3BR0665J
1 Abstract
This document is an engineering report of a universal input 30W 16V off line fly back converter power supply
®1
utilizing IFX F3R CoolSET ICE3BR0665J. The application demo board is operated in Discontinuous
Conduction Mode (DCM) and is running at 65 kHz switching frequency. It has a one output voltage with
secondary side control regulation. It is especially suitable for small power supply such as DVD player, set-top
box, game console, charger and auxiliary power of high power system, etc. The ICE3BR0665J is the latest
®
®
version of the CoolSET . Besides having the basic features of the F3R CoolSET such as Active Burst
Mode, propagation delay compensation, soft gate drive, auto restart protection for serious fault (Vcc over
voltage, Vcc under voltage, over temperature, over-load, open loop and short opto-coupler), it also has the
BiCMOS technology design, built-in soft start time, built-in and extendable blanking time, frequency jitter
feature with built-in jitter period and external auto-restart enable, etc. The particular features needs to be
stressed are the best in class low standby power and the good EMI performance.
2 Evaluation Board
Figure 1 – EVAL3BR0665J
This document contains the list of features, the power supply specification, schematic, bill of material and the
transformer construction documentation. Typical operating characteristics such as performance curve and
scope waveforms are showed at the rear of the report.
1
®
®
CoolSET is a trade mark of Infineon which is a PWM control IC integrated with CoolMOS in one package.
Application Note
5
2010-08-11
30W 16V Demoboard using ICE3BR0665J
3
List of Features
®
650V avalanche rugged CoolMOS with built-in Startup Cell
Active Burst Mode for lowest Standby Power
Fast load jump response in Active Burst Mode
65 kHz internally fixed switching frequency
Auto Restart Protection Mode for Over-load, Open Loop, Vcc Under voltage, Over-temperature & Vcc
Over-voltage
Built-in Soft Start
Built-in blanking window with extendable blanking time for short duration high current
External auto-restart enable
Max Duty Cycle 75%
Overall tolerance of Current Limiting < ±5%
Internal PWM Leading Edge Blanking
BiCMOS technology provides wide VCC range
Built-in Frequency jitter feature and soft driving for low EMI
4 Technical Specifications
Input voltage
85VAC~265VAC
Input frequency
50Hz, 60Hz
Input Standby Power
< 50mW @ no load; < 0.7W @ 0.5W load
Output voltage and current
16V +/- 1%
Output current
1.9A
Output power
30.4W
Efficiency
>85% at full load
Output ripple voltage
< 150mVp-p
Application Note
6
2010-08-11
30W 16V Demoboard using ICE3BR0665J
5
5.1
Circuit Description
Introduction
The EVAL3BR0665J demo board is a low cost off line fly back switch mode power supply (SMPS) using the
®
ICE3BR0665J system IC from the CoolSET -F3R family. The circuit, shown in Figure 2, details a 16V, 30W
power supply that operates from an AC line input voltage range of 85Vac to 265Vac, suitable for applications
in open frame supply or enclosed adapter.
5.2
Line Input
The AC line input side comprises the input fuse F1 as over-current protection. The choke L1, X2-capacitors
C1, C2 and Y1-capacitor C4 act as EMI suppressors. Spark gap device SG1, SG2 and varistor VAR1 can
absorb high voltage stress during lightning surge test. After the bridge rectifier BR1 and the input bulk
capacitor C2, a voltage of 120 to 375 VDC is present which depends on input voltage.
5.3
Start up
Since there is a built-in startup cell in the ICE3BR0665J, there is no need for external start up resistor. The
startup cell is connecting the drain pin of the IC. Once the voltage is built up at the Drain pin of the
ICE3BR0665J, the startup cell will charge up the Vcc capacitor C6 and C7. 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 D2
and buffering C6, C7. Ferrite bead FB1 used to suppress high frequency noise from auxiliary winding which
may cause IC to malfunction. In order not to exceed the maximum voltage at Vcc pin, an external zener
diode ZD1 and resistor R4 can be added.
5.5
Soft start
The Soft-Start is a built-in function and is set at 20ms.
5.6
RCD Clamper circuit
®
While turns off the CoolMOS , the clamper circuit R1, C4 and D1 absorbs the current caused by transformer
leakage inductance once the voltage exceeds clamp capacitor voltage. Finally drain to source voltage of
®
2
®
CoolMOS is lower than maximum break down voltage (V(BR)DSS = 650V ) of CoolMOS .
5.7
Peak current control of primary current
®
The CoolMOS drain source current is sensed via external shunt resistors R5 and R5A which determine the
tolerance of the current limit control. Since ICE3BR0665J is a current mode controller, it would have a cycleby-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 approximately. +/-0.97% (refer to Figure 14).
2
V(BR)DSS = 650V @ Tj = 110°C
Application Note
7
2010-08-11
30W 16V Demoboard using ICE3BR0665J
5.8
Output Stage
On the secondary side the power is coupled out by a schottky diode D3. The capacitor C11 provides energy
buffering following with the LC filter L2 and C12 to reduce the output voltage ripple considerably. Storage
capacitor C11 is selected to have an internal resistance as small as possible (ESR) to minimize the output
voltage ripple. The common mode choke L3 and ceramic capacitor C16 are added to withstand high voltage
electrostatic static discharge during ESD test.
5.9
Feedback and regulation
The output voltage is controlled using a TL431 (IC3). This device incorporates the voltage reference as well
as the error amplifier and a driver stage. Compensation network C14, C15, R8, R10, R11, R12 and R13
constitutes the external circuitry of the error amplifier of IC3. 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 for floating transmission of the control signal to the “Feedback” input via capacitor C9 of the
ICE3BR0665J control device. The optocoupler used meets DIN VDE 884 requirements for a wider creepage
distance.
5.10 Blanking Window for Load Jump / Active Burst Mode
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 BA 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, C8 can be added to BA pin to
extend it. The extended time can be achieved by an internal 13uA constant current at BA pin to charge C8
from 0.9V to 4.0V. Thus the overall blanking time is the addition of 20ms and the extended time. For
example, CBK (external capacitor at BA pin) = 0.1uF, IBK (internal charging current) = 13uA
t blanking = Basic + Extended = 20ms +
(4.0 − 0.9) × CBK
= 43ms
IBK
Note: A filter capacitor (e.g. 100pF (min. value)) may be needed to add to the BA pin if the noises cannot be
avoided to enter that pin in the physical PCB layout. Otherwise, some protection features may be mistriggered and the system may not be working properly.
5.11 Active Burst Mode
At light load condition, the SMPS enters into Active Burst Mode. At this start, the controller is always active
and thus the VCC must always be kept above the switch off threshold VCCoff ≥ 10.5V. During active burst
mode, the efficiency increases significantly and at the same time it supports low ripple on VOUT and fast
response on load jump. When the voltage level at FB falls below 1.35V, 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 0.34V 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 3.05 and 3.5V. To leave Burst Mode, FB voltage must exceed 4V. It will
reset the Active Burst Mode and turn the SMPS into Normal Operating Mode. Maximum current can then be
provided to stabilize VOUT.
5.12 Jitter mode
The ICE3B0665J 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.
Application Note
8
2010-08-11
30W 16V Demoboard using ICE3BR0665J
5.13 Protection modes
Protection is one of the major factors to determine whether the system is safe and robust. Therefore
sufficient protection is necessary. ICE3BR0665J provides all the necessary protections to ensure the system
is operating safely. The protections include Vcc over-voltage, over-temperature, over-load, open loop, Vcc
under-voltage, short opto-coupler, etc. When those faults are found, the system will go into auto-restart
which means the system will stop for a short period of time and re-start again. If the fault persists, the system
will stop again. It is then until the fault is removed, the system resumes to normal operation. A list of
protections and the failure conditions are showed in the below table.
Protection function
Failure condition
Vcc Over-voltage
1. Vcc > 25.5V or
2. Vcc > 20.5V & FB > 4.0V & during soft start period
Auto Restart
Over-temperature
(controller junction)
TJ > 130°C
Auto Restart
Over-load / Open loop
VFB > 4.0V and VBA > 4.0V
(Blanking time counted from charging VBA from 0.9V to
4.0V )
Auto Restart
Vcc Under-voltage / short
Opto-coupler
Vcc < 10.5V
Auto Restart
External Auto-restart enable
VBA < 0.33V
Auto Restart
Application Note
Protection Mode
9
2010-08-11
Application Note
N
10
*SG 2
DSP-301N-S008
C8
100pF
0.1uF/275V
C2
R5
1R
8 GND
1 BA
3 CS
DF08M
2 FB
C9
1nF
ICE3BR0665J
IC1
C7
0.1uF
7 VCC
4 5
Drain
*C10 100pF/1kV
R5A
1.1R
D1
UF4005
R1
330k/2W
Kyaw Zin Min, Eric Kok/ 08 Jul 2008
30W 16V SMPS Demoboard with ICE3BR0665J(V0.1)
0.22uF/275V
C1
L1
2 x 39mH, 1.4A
DSP-301N-S008
*ZD1
24V
*R4
39R
R3
0R
FB1
22uF/35V
C6
IC2 SFH617A-3
2
3
8
1
1
2
4
3
6
4
D2
1N4148
C4
2.2nF/400V
5
TR1 325uH
D3
*R9
620R
R6
R7
1.2K
BYW29E150
*C13
R8
150k
C14
150pF
C11
2200uF/25V
IC3
TL431
+
C15
100nF
C12
680uF/25V
L2
1.5uH
*R13
+
R12
56k
R11
0R
R10
300k
0.1uF/50V
*C16
*L3
COM
16V/1.9A
6
*VAR1
85V - 265Vac
S10K275/R
L
F1 1A
BR1
+
*SG 1
C5 2.2nF/250V,Y1
30W 16V Demoboard using ICE3BR0665J
Circuit Diagram
Figure 2 – 30W 16V ICE3BR0665J power supply Schematic
2010-08-11
30W 16V Demoboard using ICE3BR0665J
®
N.B. : In order to get the optimized performance of the CoolSET , the grounding of the PCB layout must be
connected very carefully. From the circuit diagram above, it indicates that the grounding for the
®
CoolSET can be split into several groups; signal ground, Vcc ground, Current sense resistor ground
and EMI return ground. All the split grounds should be connected to the bulk capacitor ground
separately.
®
•
Signal ground includes all small signal grounds connecting to the CoolSET GND pin such as filter
capacitor ground, C7, C8, C9 and opto-coupler ground.
•
Vcc ground includes the Vcc capacitor ground, C6 and the auxiliary winding ground, pin 2 of the
power transformer.
•
Current Sense resistor ground includes current sense resistor R5 and R5A.
•
EMI return ground includes Y capacitor, C5.
Application Note
11
2010-08-11
30W 16V Demoboard using ICE3BR0665J
7
7.1
PCB Layout
Component side component legend
Figure 3 – Component side Component Legend – View from Component Side
7.2
Solder side copper & component legend
Figure 4 – Solder side copper – View from Component Side
Application Note
12
2010-08-11
30W 16V Demoboard using ICE3BR0665J
Figure 5 – Solder side component Legend – View from Component Side
Application Note
13
2010-08-11
30W 16V Demoboard using ICE3BR0665J
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
Application Note
Ckt Code
BR1
C1
C2
C3
C4
C5
C6
C7
C8
C9
C11
C12
C14
C15
D1
D2
D3
F1
FB1
IC1
IC2
IC3
J1~J5
L1
L2
R1
R3
R5
R5A
R6
R7
R8
R10
R11
R12
TR1
Component desciption
DF08M
0.22µF/275V
0.1µF/275V
68µF/400V
2.2nF/400V
2.2nF/250V
22µF/35V
0.1µF
100pF
1nF
2200µF/25V
680µF/25V
150pF
100nF
UF4005
1N4148
BYW29E150
1A Fuse
Ferrite Bead
ICE3BR0665J (DIP-8)
SFH617A-3
TL431
Jumper
2X39mH,1.4A
1.5µH
330kΩ/2W
0Ω, (SMD 0805)
1Ω (0.5W, 1%)
1.1Ω (0.5W, 1%)
620Ω
1.2kΩ
150kΩ
300kΩ,1%
Jumper
56kΩ,1%
Lp=325µH, ER28, BH1
14
Quantity
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
5
1
1
1
1
1
1
1
1
1
1
1
1
1
Manufacturer
Epcos
Epcos
Epcos
Epcos
Murata
Epcos
Murata
Epcos
Murata
Epcos
Murata
Epcos
Infineon
Epcos
NEC-Tokin
Rohm
Rohm
Rohm
Epcos
2010-08-11
30W 16V Demoboard using ICE3BR0665J
9
Transformer Construction
Core: ER28, BH1
Bobbin: Vertical Version
Primary Inductance, Lp: 325mH (+/-2%) measured between pin 4 and pin 5 (Gapped to Inductance)
Transformer structure:
Figure 6 – Transformer structure and top view of transformer complete
Wire size requirement:
Application Note
Start
1
Stop
2
No. of turns
5
Wire size
3XAWG#29
3
6
5
8
15
6
2XAWG#29
5XAWG#29
/2 Primary
Secondary
4
3
15
2XAWG#29
1
15
Layer
Auxiliary
1
/2 Primary
2010-08-11
30W 16V Demoboard using ICE3BR0665J
10
Test Results
10.1 Efficiency
Active-Mode Efficiency versus AC Line Input Voltage
90.00
Efficiency [ % ]
89.00
87.8
87.7
88.00
87.9
87.9
87.8
86.7
87.00
87.6
87.5
150
180
87.8
87.0
86.00
85.00
87.4
85.5
84.00
83.00
85
115
230
265
AC Line Input Voltage [ Vac ]
Full load Efficiency
Average Efficiency(25%,50%,75% & 100%)
Figure 7 – Efficiency vs. AC Line Input Voltage
Efficiency versus Output Power
Efficiency [ % ]
95.00
87.7
88.0
90.00
88.5
84.5
85.00
86.9
87.7
7.5
15
88.1
87.9
87.0
82.0
80.00
75.00
0
22.5
30
Output Power [ W ]
Vin=115Vac
Vin=230Vac
Figure 8 – Efficiency vs. Output Power @ Low and High Line
Application Note
16
2010-08-11
30W 16V Demoboard using ICE3BR0665J
10.2 Input Standby Power
Standby Power @ no-load versus AC Line Input Voltage
60
Input Power [ mW ]
50
43.95
38.71
40
31.00
31.48
85
115
32.40
33.59
150
180
30
20
230
265
AC Line Input Voltage [ Vac ]
Po = 0W
Figure 9 – Input Standby Power @ no load Vs. AC Line Input Voltage (measured by Yokogawa WT210
power meter - integration mode)
Standby Pow er @ 0.5W & 0.3W load versus AC Line Input Voltage
Input Power [ W ]
0.70
0.59
0.59
0.59
0.60
0.61
0.62
0.50
0.39
0.39
0.39
0.39
0.40
85
115
150
180
230
0.41
0.30
265
AC Line Input Voltage [ Vac ]
Po=0.5W
Pout=0.3W
Figure 10 – Input Standby Power @ 0.5W & 0.3W Vs. AC Line Input Voltage (measured by Yokogawa
WT210 power meter - integration mode)
Application Note
17
2010-08-11
30W 16V Demoboard using ICE3BR0665J
Standby Pow er Efficiency @ 0.5W & 0.3W load versus AC Line Input Voltage
90
84.51
Efficiency [ % ]
85
84.45
84.01
83.55
82.04
80.24
80
77.80
77.76
77.38
76.87
75.51
73.31
75
70
85
115
150
180
230
265
AC Line Input Voltage [ Vac ]
Pout=0.5W
Pout=0.3W
Figure 11 – Input Standby Power Efficiency @ 0.5W & 0.3W vs. AC Line Input Voltage
10.3 Line Regulation
Output Voltage [ V ]
Line Regulation : Output Voltage @ Full Load versus AC Line Input Voltage
16.50
16.00
15.95
15.95
15.95
15.95
15.95
15.95
85
115
150
180
230
265
15.50
AC Line Input Voltage [ Vac ]
Vo @ full load
Figure 12 – Line Regulation Vo @ full load vs. AC Line Input Voltage
Application Note
18
2010-08-11
30W 16V Demoboard using ICE3BR0665J
10.4 Load Regulation
Load Regulation: Vout versus Outoput Power
Ouput Voltage [ V ]
16.10
16.05
15.98
15.98
16.00
15.95
15.98
15.97
15.98
15.96
15.97
15.95
15.96
15.90
15.95
15.85
15.80
0
7.5
15
22.5
30
Output Pow er [ W ]
Output Voltage @ 230Vac
Output Voltage @ 115Vac
Figure 13 – Load Regulation Vout vs. Output Power
10.5 Max. Output Power
Max. Overload Output & Input Pow er ( Peak Pow er ) versus AC Line Input Voltage
Max. Overload Output Power [ W ]
Pin=44.27±0.97% & Pout=38.31±2.7%
50
45
44
40
37.28
43.9
37.91
43.84
44.12
43.86
38.39
38.23
44.7
38.71
39.35
230
265
35
30
85
115
150
180
AC Line Input Voltage [ V ]
Peak Output Power
Peak Input Power
Figure 14 – Max. Output Power (before over-load protection) vs. AC Line Input Voltage
Application Note
19
2010-08-11
30W 16V Demoboard using ICE3BR0665J
10.6 ESD Test
Pass* (EN61000-4-2) Level 4: 8kV for contact discharge.
*Add L3 and C16
10.7 Lightning Surge Test
Pass* (EN61000-4-5) 4kV for line to earth
*Add SG1 & SG2 (DSP-301N-S008)
10.8 Conducted EMI
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 (30W) with input voltage of 115Vac and 230Vac.
80
EN_V_QP
70
EN_V_AV
QP Pre
AV Pre
60
50
dBµV
40
30
20
10
0
-10
0.1
1
10
100
-20
f / MHz
Figure 15 – Max. Load (30W) with 115 Vac (Line)
Application Note
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2010-08-11
30W 16V Demoboard using ICE3BR0665J
80
EN_V_QP
70
EN_V_AV
QP Pre
AV Pre
60
50
dBµV
40
30
20
10
0
-10
0.1
1
10
100
-20
f / MHz
Figure 16 – Max. Load (30W) with 230 Vac (Line)
Application Note
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30W 16V Demoboard using ICE3BR0665J
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 30W load
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA Voltage (VBA)
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA Voltage (VBA)
Startup time = 0.57s
Startup time = 0.56s
Figure 17 – Startup @ Vin=85Vac & 30W load
Figure 18 – Startup @ Vin=265Vac & 30W load
11.2 Soft start at low and high AC line input voltage and 30W load
Channel 1; C1 : CS voltage (VCS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA Voltage (VBA)
Channel 1; C1 : CS voltage (VCS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA Voltage (VBA)
Soft Star time = 22mS
Soft Star time = 20mS
Figure 19 – Soft Start @ Vin=85Vac & 30W load
Figure 20– Soft Start @ Vin=265Vac & 30W load
Application Note
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30W 16V Demoboard using ICE3BR0665J
11.3 Frequency jittering
63 kHz
63.1 kHz
67.8 kHz
67.7 kHz
Channel 1; C1 : Drain Source voltage (VDS)
Channel 1; C1 : Drain Source voltage (VDS)
Frequency changing from 63.1 kHz ~ 67.7 kHz,
Jitter period is set at 4ms internally
Frequency changing from 63kHz ~ 67.8 kHz, Jitter
period is set at 4ms internally
Figure 21 – Frequency change shown at VDS @
Vin=85Vac and 30W Load
Figure 22 – Frequency change shown at VDS @
Vin=265Vac and 30W Load
11.4 Drain to source voltage and Current at 30W load
Channel 1; C1 : Drain Current (IDS)
Channel 2; C2 : Drain Source Voltage (VDS)
Duty cycle = 43.77%
Figure 23 – Operation @ Vin = 85Vac and 30W
load
Application Note
Channel 1; C1 : Drain Current (IDS)
Channel 2; C2 : Drain Source Voltage (VDS)
Duty cycle = 10.76%
Figure 24 – Operation @ Vin = 265Vac and
30W load
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30W 16V Demoboard using ICE3BR0665J
11.5 Load transient response (Load jump from 10% to 100%)
120mV
120mV
Channel 1; C1 : Output Ripple Voltage (Vo)
Channel 2; C2 : Output Current (Io)
Channel 1; C1 : Output Ripple Voltage (Vo)
Channel 2; C2 : Output Current (Io)
Current step slew rate = 0.4A/us
Current step slew rate = 0.4A/us
Figure 25 – Load jump @ Vin=85Vac from 3W to
30W load
Figure 26 – Load jump @ Vin=265Vac from 3W to
30W load
11.6 AC output ripple voltage at 30W load
Channel 1; C1 : Output Ripple Voltage (Vo_ripple)
Channel 1; C1 : Output Ripple Voltage (Vo_ripple)
Vo_ripple_pk to pk = 140mV
Vo_ripple_pk to pk = 150mV
Probe Terminal end with decoupling capacitor
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
of
Figure 27 – AC output ripple @ Vin=85Vac and
30W load
Application Note
Probe Terminal end with decoupling capacitor of
0.1uF(ceramic) & 1uF(Electrolytic), 20MHz filter
Figure 28 – AC output ripple @ Vin=265Vac and
30W load
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30W 16V Demoboard using ICE3BR0665J
11.7 Active burst mode at 0.5W load
Channel 1; C1 : Drain Source Voltage (VDS)
Channel 2; C2 : Current Sense Voltage (VCS)
Channel 3; C3 : Feedback voltage (VFB)
Blanking time to enter burst mode : 19.2ms
Figure 29 – Active burst mode @ Vin=85Vac and
step from 1.9A to 0.03A
Channel 1; C1 : Drain Source Voltage (VDS)
Channel 2; C2 : Current Sense Voltage (VCS)
Channel 3; C3 : Feedback voltage (VFB)
Blanking time to enter burst mode : 19.4ms
Figure 30 – Active burst mode @ Vin=265Vac
and step from 1.9A to 0.03A
Channel 4; C4 : Output Voltage ( Vo )
Output ripple : app. 40mV
Figure 31 – Output ripple at active burst mode @
Vin=85Vac and 0.5W load
Channel 4; C4 : Output Voltage ( Vo )
Output ripple : app. 40mV
Figure 32 – Output ripple at active burst mode @
Vin=265Vac and 0.5W load
Application Note
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30W 16V Demoboard using ICE3BR0665J
11.8 Vcc overvoltage 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 : BA voltage (VBA)
System enters auto restart mode when VCC>20.5V &
VFB >4.0V during soft start period
Figure 33 – Vcc overvoltage protection @
Vin=85Vac; R10 disconnected before system start
up with no load
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback Voltage (VFB)
Channel 4; C4 : BA voltage (VBA)
System enters auto restart mode when VCC>20.5V
& VFB >4.0V during soft start period
Figure 34 – Vcc overvoltage protection @
Vin=265Vac; R10 disconnected before system start
up with no load
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback Voltage (VFB)
Channel 4; C4 : BA voltage (VBA)
System enters auto restart mode when VCC>25.5V
Figure 35 – Vcc overvoltage protection @
Vin=85Vac; R10 disconnected under light load
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback Voltage (VFB)
Channel 4; C4 : BA voltage (VBA)
System enters auto restart mode when VCC>25.5V
Figure 36 – Vcc overvoltage protection @
Vin=265Vac; R10 disconnected under light load
Application Note
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2010-08-11
30W 16V Demoboard using ICE3BR0665J
11.9 Over load protection – Auto Restart
Channel 1; C1 : Drain to Source Voltage (VDS)
Channel 2; C2 : Supply Current (VCC)
Channel 3; C3 : Feedback Voltage (VFB)
Channel 4; C4 : BA voltage (VBA)
System enters auto-restart when VFB>4.0V, VBA >4V
with (built-in+extendable) blanking time ≈42ms
Figure 37 – Over load protection with extended
blanking time @ Vin=85Vac; output power step up
from 1.9A to 2.5A load(C8 = 0.1µF)
11.10
Channel 1; C1 : Drain to Source Voltage (VDS)
Channel 2; C2 : Supply Current (VCC)
Channel 3; C3 : Feedback Voltage (VFB)
Channel 4; C4 : BA voltage (VBA)
System enters auto-restart when VFB>4.0V, VBA>4V
with (built-in+extendable) blanking time ≈42ms
Figure 38 – Over load protection with extended
blanking time @ Vin=265Vac; output power step
up from 1.9A to 2.5A load(C8 = 0.1µF)
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 : BA Voltage (VBA)
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA Voltage (VBA)
System enters auto-restart when VFB>4.0V, VBA >4V
with (built-in+extended) blanking time ≈42ms
System enters auto-restart when VFB>4.0V, VBA
>4V with (built-in+extended) blanking time ≈42ms
Figure 39 – Open loop protection with extended
blanking time @ Vin=85Vac; R10 disconnected
during system operation at 30W load(C8=0.1µF)
Figure 40 – Open loop protection with extended
blanking time @ Vin=265Vac; R10 disconnected
during system operation at 30W load(C8=0.1µF)
Application Note
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30W 16V Demoboard using ICE3BR0665J
11.11
Vcc under voltage/Short optocoupler 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 : BA Voltage (VBA)
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA Voltage (VBA)
System enters Auto Restart mode when Vcc<10.5V
System enters Auto Restart mode when Vcc<10.5V
Figure 41 – Short optocoupler protection @
Vin=85Vac; Short the transistor of optocoupler
during system operation.
Figure 42 – Short optocoupler protection @
Vin=265Vac; Short the transistor of optocoupler
during system operation.
11.12
External auto restart enable
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA Voltage (VBA)
Channel 1; C1 : Drain Source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BA Voltage (VBA)
System enters auto restart mode when Vba<0.33V
System enters auto restart mode when Vba<0.33V
Figure 43 – Auto restart enable by trigger BA pin @
Vin=85Vac; Short BA pin during system operation
Figure 44– Auto restart enable by trigger BA pin @
Vin=265Vac; Short BA pin during system operation
Application Note
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30W 16V Demoboard using ICE3BR0665J
12
Appendix
12.1
Slope compensation for CCM operation
This demo board is designed in Discontinuous Conduction Mode ( DCM ) operation. If the application is
designed in Continuous Conduction Mode ( CCM ) operation where the maximum duty cycle exceeds the
50% threshold, it needs to add the slope compensation network. Otherwise, the circuitry will be unstable. In
this case, three more components ( 2 ceramic capacitors C17 / C18 and one resistor R19) is needed to add
as shown in the circuit diagram below.
Figure 41 – Circuit Diagram Switch Mode Power Supply with Slope Compensation
More information regarding how to calculate the additional components, see application note
AN_SMPS_ICE2xXXX – available on the internet: www.infineon.com (directory : Home > Power
Semiconductors > Integrated Power ICs > CoolSET® F2)
13
References
®
[1]
Infineon Technologies, Datasheet “CoolSET -F3R ICE3BR0665J Off-Line SMPS Current Mode
®
Controller with integrated 650V CoolMOS and Startup cell( Frequency Jitter Mode ) in DIP-8”
[2]
Eric Kok Siu Kam, Kyaw Zin Min, Infineon Technologies, Application Note “ICE3BRxx65J CoolSET F3R (DIP-8) new Jitter version Design Guide”
[3]
Harald Zoellinger, Rainer Kling, Infineon Technologies, Application Note “AN-SMPS-ICE2xXXX-1,
®
CoolSET ICE2xXXXX for Off-Line Switching Mode Power supply (SMPS )”
®
Application Note
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