15W 5V Evaluation board using ICE3A1065ELJ

Application Note, V1.1, Aug 2010
A N - E V A L 3 A 1 0 6 5 EL J
15W 5.0V SMPS Evaluation Board with
CoolSET® F 3 I C E 3 A 1 0 6 5 E L J
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,
168 Kallang Way,
349253 Singapore, 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.
15W 5V Demo board using ICE3A1065ELJ on board
Revision History:
Previous Version:
2010-08-11
V1.1
1.0
Page
Subjects (major changes since last revision)
1, 5, 11
Change demo board name to EVAL3A1065ELJ
®
15W 5.0V SMPS Evaluation Board with CoolSET F3 ICE3A1065ELJ:
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-PS0021
15W 5V Demoboard using ICE3A1065ELJ on board
Table of Contents
Page
1
Abstract..........................................................................................................................................5
2
Evaluation Board...........................................................................................................................5
3
List of Features .............................................................................................................................6
4
Technical Specifications ..............................................................................................................6
5
Circuit Diagram .............................................................................................................................7
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
7.8.1
7.8.2
7.8.3
7.9
7.9.1
7.9.2
Circuit Description ......................................................................................................................11
Introduction....................................................................................................................................11
Line Input.......................................................................................................................................11
Start up & auxiliary supply circuit ..................................................................................................11
RCD Clamper circuit .....................................................................................................................11
Peak primary current control circuit ..............................................................................................11
Output Stage of secondary side....................................................................................................11
Feedback and regulation...............................................................................................................12
Particular features .........................................................................................................................12
Blanking Window for Load Jump & Active Burst Mode.................................................................12
Active Burst Mode .........................................................................................................................12
Frequency jitter mode ...................................................................................................................12
Protection modes ..........................................................................................................................13
Auto restart mode..........................................................................................................................13
Latch off mode...............................................................................................................................13
8
Component List ...........................................................................................................................14
9
Transformer Construction..........................................................................................................15
10
10.1
10.2
10.3
10.4
10.5
10.6
10.7
10.8
Test Results .................................................................................................................................16
Efficiency .......................................................................................................................................16
Input Standby Power .....................................................................................................................17
Line Regulation .............................................................................................................................18
Load Regulation ............................................................................................................................19
Max. Overload Output Power........................................................................................................19
Electrostatic Discharge Test (ESD)...............................................................................................20
Lightning Surge Test .....................................................................................................................20
Conducted EMI Test .....................................................................................................................20
11
11.1
11.2
11.3
11.4
11.5
11.6
11.7
11.8
11.9
11.10
11.11
Waveforms and scope plots ......................................................................................................22
Startup @ low and high AC line input voltage and 15W load .......................................................22
Drain to source voltage and current during 15W load operation ..................................................23
Load transient response (Load jump from 10% to 100%) ............................................................23
AC output ripple during 15W .........................................................................................................24
Active Burst Mode @ light load .....................................................................................................25
Vcc overvoltage protection (latch off mode)..................................................................................26
Overload protection without/with extended blanking time (auto restart mode).............................27
Open loop protection (auto restart mode) .....................................................................................28
Vcc under voltage/Short optocoupler protection (auto restart mode) ...........................................28
External latch off enable................................................................................................................29
Frequency Jittering........................................................................................................................29
12
12.1
Appendix ......................................................................................................................................30
Slope compensation for CCM operation .......................................................................................30
13
References ...................................................................................................................................30
Application Note
4
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
1
Abstract
This document is an engineering report that describes a universal input power supply designed in a 5V 15W
®1
off line SMPS flyback converter topology that utilizes the ICE3A1065ELJ CoolSET . The application board
is designed for discontinuous conduction mode (DCM) with current mode controller IC and running at 100
kHz switching frequency. It has one output voltage with secondary control regulation. It is especially suitable
for small power supply such as DVD player, set-top box, game console, charger and auxiliary power for high
®
power system, etc. The ICE3A1065ELJ is an enhanced version of the F3 CoolSET especially in robustness
®
to the system noise such as ESD, lightning surge, etc. Besides having the basic features of the F3 CoolSET
such as Active Burst Mode, propagation delay compensation, soft gate drive, latch off protection for serious
fault (Vcc OVP, OTP and short winding) and auto-restart protection for general fault (OLP and Open loop),
etc., 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 latch enable pin, etc. The particular good
features are the extremely low standby input power, the low EMI performance and the robustness to the
system noise.
2
Evaluation Board
Figure 1 – EVAL3A1065ELJ
This document contains the list of features, the power supply specification, schematic, bill of material and the
transformer construction drawing. Typical operating characteristics are presented at the rear of the report
and it consists of performance curves and scope waveforms.
1
®
®
CoolSET is a current mode PWM control IC and the power MOSFET CoolMOS within one package
designed for low cost switch mode power supplies (SMPS).
Application Note
5
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
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
100kHz internally fixed switching frequency
Built-in latched Off Mode for Overtemperature, Overvoltage & Short Winding Detection
Auto Restart Mode for Overload, Open Loop & VCC Undervoltage
Built-in Soft Start
Built-in and extendable blanking Window for short duration high current
External latch 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 driving for low EMI
Robustness to system noise such as ESD, lightning surge, etc.
4
Technical Specifications
Input voltage
85VAC~265VAC
Input frequency
50Hz, 60Hz
Input Standby Power
<100mW @ no load; < 0.8W @ 0.5W load
Output voltage and current
5V +/- 2%
Output current
3.0A
Output power
15W
Efficiency
>75% at full load
Output ripple voltage
< 50mVp-p
Application Note
6
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
5
Circuit Diagram
Figure 2 – 15W 5.0V ICE3A1065ELJ power supply Schematic
Application Note
7
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
®
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, C6, C7, C8 and optocoupler ground.
•
Vcc ground includes the Vcc capacitor ground, C9 and the auxiliary winding ground, pin 2 of the
power transformer.
•
Current Sense resistor ground includes current sense resistor R4 and R4A.
•
EMI return ground includes Y capacitor, C4.
Application Note
8
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
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
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
Figure 5 – Solder side component Legend – View from Component Side
Application Note
10
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
7
Circuit Description
7.1
Introduction
The EVAL3A1065ELJ demoboard is a low cost off line flyback switch mode power supply (SMPS) using the
®
ICE3A1065ELJ system IC from the CoolSET -F3 family. The circuit, shown in Figure 2, details a 5.0V, 15W
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 line input side comprises the input fuse F1 as over-current protection. The common mode choke L1,
X2-capacitor C1 and Y1-capacitor C4 act as EMI suppressors. Spark gap device SG1 and SG2 can absorb
high voltage stress during lightning surge test. After the bridge rectifier BR1 and the input bulk capacitor C2,
a voltage of 100 to 380 VDC is present which changed with input voltage.
7.3
Start up & auxiliary supply circuit
Since there is a built-in startup cell in the ICE3A1065ELJ, 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
ICE3A1065ELJ, the startup cell will charge up the Vcc capacitor C5 and C6. 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.
During operation, the Vcc pin is supplied via a separate transformer winding with associated rectification D2
and buffering C5 and C6. Resistor R3 & R5 is used for current limiting. In order not to exceed the maximum
voltage at Vcc pin an external zenor diode ZD1 and resistor R6 are added.
The Soft-Start is a built-in function and is set at 20ms. There is no need for extra components.
7.4
RCD Clamper circuit
®
While turning off the internal CoolMOS , the clamper circuit R2, C3 and D1 absorbs the current caused by
transformer leakage inductance once the voltage exceeds clamper circuit voltage. Then the Drain to Source
1
®
voltage is well below the maximum break down voltage (V(BR)DSS = 650V ) of internal CoolMOS .
7.5
Peak primary current control circuit
®
The drain to source current of the internal CoolMOS is sensed via external shunt resistors R4 and R4A. An
accurate value of the shunt together with the IC’s propagation delay compensation control can effectively
improve the peak power control between high line and low line which is shown in the peak power limitation
curve in the rear part of the report.
7.6
Output Stage of secondary side
On the secondary side of the system the power is coupled out by a schottky diode D21. The capacitor C21
provides energy buffering following with the LC filter L21 and C22 to reduce the output voltage ripple
considerably. Storage capacitor C21 is a high ripple current electrolytic capacitor which has a very low ESR
and can reduce the output voltage ripple. L22 and C24 can help to suppress the high transient voltage spike
during Electrostatic Discharge (ESD) test.
1
V(BR)DSS = 650V @ Tj = 110°C
Application Note
11
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
7.7
Feedback and regulation
The output voltage is controlled using a TL431 reference diode IC (IC3). This device incorporates the voltage
reference as well as the error amplifier and a driver stage. Compensation network Cc1, Cc2, Rc1, Rc2, Rc3,
Rc3A and Rc4 constitute the external circuitry of the error amplifier of IC3. This circuitry allows the feedback
to be precisely matched to dynamically varying load conditions, thereby providing stable control. The
maximum current through the optocoupler diode and the voltage reference is set by using resistors Rc5 and
Rc6. Optocoupler IC2 is used for floating transmission of the control signal to the “Feedback” input via
capacitor C8 of the ICE3A1065ELJ control device. The selected optocoupler meets DIN VDE 884
requirements for a wider creepage distance. C8 is a noise filtering capacitor. It should be as small as
possible so that it can reduce the noise and at the same time provide fast response to the output.
7.8
Particular features
7.8.1 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. 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, it should go to the extendable mode, where a capacitor, C7 should be
added to BL pin. The extended blanking time can be achieved by charging the C7 at BL pin from 0.9V to
4.0V with an internal 8.4uA constant current source. Thus the overall blanking time is the addition of 20ms
and the extended time. For example, C7=10nF, IBK (internal current source)=8.4uA. The voltage at Feedback
pin will rise up to exceed 4.5V without switching off the IC under over load condition when it is within the
blanking time frame. At that period the transferred power is limited to the maximum peak current defined by
the value of the current sense resistor, R4 and R4A.
Blanking time (total) = 20ms + C7 X (4-0.9)/IBK = 23.7ms
Note: A noise filtering capacitor ( at least 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 mistriggered and the system may not be working properly.
The blanking time to enter the Active Burst Mode is built-in 20ms with no extension. If a low load condition is
detected when VFB is falling below 1.35V, the system will only enter Active Burst Mode after 20ms blanking
time while VFB is still below 1.35V.
7.8.2 Active Burst Mode
At light load condition, the SMPS enters into Active Burst Mode. The controller is always active at this state.
VCC must be designed higher than the Vcc switch off threshold VCCoff ≥ 10.5V. While supporting low ripple on
VOUT and fast response on load jump, efficiency also increased significantly during Active Burst Mode. When
the voltage level at FB falls below 1.35V, the internal blanking timer starts to count. When it reaches 20ms
and the FB voltage is still below 1.35V, it will enter Active Burst Mode. The Blanking Window is generated to
avoid a sudden entering of Burst Mode due to load jump.
During Active Burst Mode the current sense voltage limit is reduced from 1V to 0.31V so as to reduce the
conduction losses. 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 3.61V. To leave Burst Mode, FB voltage must exceed 4.5V. It will reset the Active
Burst Mode and turn the SMPS into Normal Operating Mode. Maximum current can then be provided to
stabilize VOUT.
7.8.3 Frequency jitter mode
The ICE3A1065ELJ has frequency jittering feature to reduce the EMI noise. The jitter frequency is internally
set at 100 kHz +/-4 kHz and the jitter period is set at 4ms.
Application Note
12
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
7.9
Protection modes
There are two kinds of protection modes for the device; auto-restart mode and the latch-off mode. The autorestart mode is for the general fault and the latch off mode is for the serious fault.
7.9.1 Auto restart mode
In the auto-restart mode, the gate switching is stopped and the Vcc voltage will drop. When it drops to 10.5V,
the startup cell will turn on and charge up the Vcc capacitor to 18V. Then the startup cell turns off and the
device will start the start up phase from soft start. However, if the fault persists, the device will enter the autorestart mode again. If the fault is removed, the device will return to normal mode in the next start up phase. A
list of auto restart mode protections and the failure conditions are showed in the below table.
Protection function
Failure condition
Over-load / Open loop
VFB > 4.5V and VBL > 4.0V
(Blanking time counted from charging VBA from 0.9V to 4.0V
together with the basic 20ms)
Protection Mode
Auto Restart
Vcc Under-voltage / short
Optocoupler
Vcc < 10.5V
Auto Restart
7.9.2 Latch off mode
The operation of latch-off mode is very similar to auto-restart mode but there is no startup phase when the
Vcc reach 18V. Since there is no switching energy from the auxiliary winding, the Vcc voltage will then drop
to 10.5V. Then the startup cell charge sequence repeats again. The Vcc waveform during latch-off mode
likes a saw-tooth shape. The latch-off mode can be reset if the Vcc voltage is lower than 6.23V. A list of latch
off mode protections and the failure conditions are showed in the below table.
Protection function
Failure condition
Vcc Over-voltage
Vcc > 24V & VFB > 4.5V
Latch Off
Over-temperature
(controller junction)
TJ > 130°C
Latch Off
Short Winding/Short Diode
VCS > 1.66V
Latch Off
External latch enable
VBL < 0.1V
Latch Off
Application Note
Protection Mode
13
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
8
Items
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
Component List
Part
BR1
C1
C2
C3
C4
C6
C7
C8
C9
C21
C22
C24
Cc1
Cc2
D1
D2
D21
F1
IC1
IC2
IC3
J1, J2, J3, J4, J5, J6
L1
L21
L22
R2
R3
R4
R4A
R5
R6
Rc1
Rc2
Rc3
Rc4
Rc5
Rc6
TR1
ZD1
Application Note
Type
RS207, 2A 1000V
0.22uF/275V, X2 capacitor
47uF/400V
2n2F/400V
2.2nF/250V, Y1 capacitor
0.1u/50V
10nF/50V
1nF/50V
22u/50V
2200uF/35V
470uF/35V
0.1uF/50V
1uF/50V
1nF/50V
UF4005
1N4148
MBR745
1A 250V
ICE3A1065ELJ
SFH617A-3 1
TL431CLP
Jumper
2 x 27mH, 0.7A
1.5uH
2 x 100µH,(µi=10000,T38,R 6.30)
150K, 2W, 5%
0R, (SMD 0805)
R4 1.2R, 0.5W, 1%
27R, 0.1W, 5% ( 0805 SMD )
560R, 0.1W, 5% ( 0805 SMD )
39R, 0.1W, 5% ( 0805 SMD )
10K, 0.25W, 1%
510R,0.25W, 1%
10K, 0.25W, 1%
6.8K, 0.25W, 5%
1K, 5% ( 0805 SMD )
100R, 5% ( 0805 SMD )
EF20, N87, Lp=520uH
22V zener diode
14
Quantity
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
6
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Manufacturer
EPCOS
EPCOS
EPCOS
Murata
EPCOS
EPCOS
Murata
Murata
EPCOS
Infineon
EPCOS
NEC-Tokin
EPCOS
ROHM
ROHM
ROHM
ROHM
ROHM
ROHM
EPCOS
-
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
9
Transformer Construction
Core and material: EF20/10/6, N87
Bobbin: Horizontal type
Primary Inductance, Lp = 520µH 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
2
Stop
1
No. of turns
10
Wire size
2XAWG#32
3
9
4
6
25
4
1XAWG#32
3XAWG#26
/2 Primary
Secondary
5
3
25
1XAWG#32
1
15
Layer
Auxiliary
1
/2 Primary
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
10
Test Results
10.1 Efficiency
Efficiency versus AC Line Input Voltage
Efficien cy [ % ]
85.00
80.00
78.7
78.3
77.4
78.5
78.2
75.6
75.00
70.00
85
115
150
180
230
265
AC Line Input Voltage [ Vac ]
Efficiency @ 15W output power
Figure 7 – Efficiency versus AC Line Input Voltage
Efficiency versus Output Power
85.00
79.8
78.8
78.7
Efficiency [%]
80.00
75.8
78.1
78.9
3.75
7.5
78.4
75.6
75.00
78.5
77.4
70.00
0
11.25
15
Output Power [ W ]
Vin=115Vac
Vin=230Vac
Figure 8 – Efficiency vs. Output Power @ 115 & 230 Vac
Application Note
16
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
10.2 Input Standby Power
Stanby Power @ no-load versus AC Line Input Voltage
Input Power [ mW ]
50
35.07
40
30
20
17.51
17.91
85
115
18.74
19.47
150
180
23.30
10
0
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 @ 0.3W & 0.5W load versus AC Line Input Voltage
Input Power [ W ]
1.00
0.67
0.50
0.41
0.71
0.68
0.68
0.41
0.42
0.42
0.43
0.44
115
150
180
230
265
0.67
0.67
0.00
85
AC Line Input Voltage [ Vac ]
Po=0.3W
Po=0.5W
Figure 10 – Input Standby Power @ 0.3 and 0.5W load vs. AC Line Input Voltage ( measured by Yokogawa
WT210 power meter – integration mode )
Application Note
17
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
Standby Pow er Efficiency @ 0.3W & 0.5W load versus AC Line Input Voltage
80
Efficiency [ % ]
76.28
75.78
75.44
75.58
74.68
75
72.11
74.47
73.93
73.43
73.07
71.55
70
69.42
65
85
115
150
180
230
265
AC Line Input Voltage [ Vac ]
Po=0.3W
Po=0.5W
Figure 10 – Input Standby Power efficiency @ 0.3 and 0.5W load vs. AC Line Input Voltage
10.3 Line Regulation
Line Regulation : Vo versus AC Line Input Voltage @ 15W load
Output Voltage [ V ]
5.50
5.02
5.03
5.03
5.03
5.03
5.03
85
115
150
180
230
265
5.00
4.50
AC Line Input Voltage [ Vac ]
Vo @ 15W load
Figure 11 – Line Regulation vs. AC Line Input Voltage
Application Note
18
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
10.4 Load Regulation
Load Regulation: Vout versus Load @ Vin = 230Vac
Ouput Voltage [ V ]
5.50
5.1
5.08
5.07
5.05
5.03
3.75
7.5
11.25
15
5.00
4.50
0
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 [ W ]
Max. Overload Output & Input Pow er ( Peak Pow er ) versus AC Line Input Voltage
25
Pin=22.63W±1.4% & Po=16.9W±3.25%
22.96
22.51
22.33
22.31
22.61
22.95
20
16.35
16.75
16.85
16.95
17.20
17.45
150
180
230
265
15
85
115
AC Line Input Voltage [ V ]
Peak Output Power
Peak Input Power
Figure 13 – Maximum Overload Output & Input Power vs. AC Line Input Voltage
Application Note
19
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
10.6 Electrostatic Discharge Test (ESD)
Pass 20kV ESD test (EN61000-4-2) in contact discharge.
10.7 Lightning Surge Test
Pass 8kV lightning surge test (EN61000-4-5) in Line to Earth.
* With the addition of SG1 & SG2 (DSP-301N-S008).
10.8 Conducted EMI Test
Pass CISPR 22 Class B EMI test.
The conducted EMI was measured by Schaffner (SMR4503) receiver under CISPR 22 class B test standard.
The demo board was tested with maximum load (15W) 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 14 – Max. Load (15W) with 115 Vac (Line)
Application Note
20
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
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 (15W) with 230 Vac (Neutral)
Application Note
21
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
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 15W load
C1
C1
C2
C2
C3
C3
C4
C4
Channel 1; C1 : Drain to source voltage (VDS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
C3
Channel
1; C1 : Drain to source voltage (VDS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
Startup time = 0.52s
Startup time = 0.52s
Figure 16 – Startup @ Vin=85Vac and 15W load
Figure 17 – Startup @ Vin=265Vac and 15W load
C1
C1
C2
C2
C3
C4
C3
C4
Z4
Z4
C4
Channel 1; C1 : Drain to source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : Current sense voltage (VCS)
Channel Z4; Zoom of Channel 4
Channel 1; C1 : Drain to source voltage (VDS)
Channel 2; C2 : Supply Voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : Current sense voltage (VCS)
Channel Z4; Zoom of Channel 4
Soft start time = 20ms
Soft start time = 20ms
Figure 18 – Soft Start @ Vin=85Vac and 15W load
Figure 19 – Soft Start @ Vin=265Vac and 15W load
Application Note
22
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
11.2 Drain to source voltage and current during 15W load operation
C1
C1
C2
C2
Channel 1; C1 : Drain to source voltage (VDS)
Channel 2; C2 : Drain to source current (IDS)
Channel 1; C1 : Drain to source voltage (VDS)
Channel 2; C2 : Drain to source current (IDS)
Duty cycle = 41.34%
Duty cycle = 13.03%
Figure 16 – Operation @ Vin = 85Vac and 15W load
Figure 17–Operation @ Vin = 265Vac and 15W load
11.3 Load transient response (Load jump from 10% to 100%)
C1
C1
C2
C2
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 1.5W to 15W load
Figure 19 – Load jump @ Vin=265Vac from 1.5W to 15W load
Application Note
23
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
11.4 AC output ripple during 15W
C1
C1
Channel 1; C1 : Output ripple voltage
Channel 1; C1 : Output ripple voltage
Vo_ripple_pk_to_pk = 40mV
Vo_ripple_pk_to_pk = 40mV
Probe terminal end with decoupling capacitor of 0.1uF(ceramic) +
10uF(Electrolytic), 20MHz filter
Probe terminal end with decoupling capacitor of 0.1uF(ceramic) +
10uF(Electrolytic), 20MHz filter
Figure 20 – AC output ripple @ Vin=85Vac and 15W load
Figure 21 – AC output ripple @ Vin=265Vac and 15W load
Application Note
24
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
11.5 Active Burst Mode @ light load
C1
C1
C2
C2
C3
C3
C4
C4
Channel 1; C1 : Drain to source voltage (VDS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : Current sense voltage (VCS)
Channel 1; C1 : Drain to source voltage (VDS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : Current sense voltage (VCS)
Blanking time to enter burst mode : 19.4ms
Blanking time to enter burst mode : 19.4ms
Figure 22 – Active burst mode @ Vin=85Vac and step from 3A
Figure 23 – Active burst mode @ Vin=265Vac and step from
3A to 0.05A load
to 0.05A load
C1
C1
Channel 1; C1 : Output ripple voltage
Channel 1; C1 : Output ripple voltage
Vo_ripple_pk_to_pk = 40mV
Vo_ripple_pk_to_pk = 40mV
Probe terminal end with decoupling capacitor of 0.1uF(ceramic) +
10uF(Electrolytic), 20MHz filter
Probe terminal end with decoupling capacitor of 0.1uF(ceramic) +
10uF(Electrolytic), 20MHz filter
Figure 24 – Output ripple at active burst mode @ Vin=85Vac
Figure 25 – Output ripple at active burst mode @ Vin=265Vac
and 0.25W load
and 0.25W load
Application Note
25
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
11.6 Vcc overvoltage protection (latch off mode)
C1
C1
C2
C2
C3
C3
C4
C4
Channel 1; C1 : Drain to 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 to source voltage (VDS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
System enters latch-off mode when VCC>24V & VFB >
4.5V
System enters latch-off mode when VCC>24V & VFB >
4.5V
Figure 26 – Vcc overvoltage protection @ Vin=85Vac; Rc1
disconnected at startup with light load.( CBL =100pF, remove ZD1)
Figure 27 – Vcc overvoltage protection @ Vin=265Vac; Rc1
Application Note
26
disconnected at startup with light load.(CBL=100pF, remove ZD1)
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
11.7
Overload protection without/with extended blanking time (auto restart
mode)
C1
C1
C2
C2
C3
C3
C4
C4
Channel 1; C1 : Drain to 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 to source voltage (VDS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
Blanking time to enter auto-restart mode: 20ms;
System enters auto-restart when VFB>4.5V, VBL > 4V
with basic mode blanking time.
Blanking time to enter auto-restart mode: 20ms;
System enters auto-restart when VFB>4.5V, VBL > 4V
with basic mode blanking time.
Figure 30 – Over load protection without extended blanking
Figure 31 – Over load protection without extended blanking
time; CBL =100pF @ Vin=265Vac and output power step from 0A
to 4A load
time; CBL =100pF @ Vin=85Vac and output power step from 0A to
4A load
C1
C1
C2
C2
C3
C3
C4
C4
Channel 1; C1 : Drain to 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 to source voltage (VDS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
Blanking time to enter auto-restart mode: 23ms;
System enters auto-restart when VFB>4.5V, VBL > 4V
with extended blanking time.
Blanking time to enter auto-restart mode: 23ms;
System enters auto-restart when VFB>4.5V, VBL > 4V
with extended blanking time.
Figure 30 – Over load protection with extended blanking time;
CBL = 10nF @ Vin=85Vac and output power step from 3A to 4A
load
Figure 31 – Over load protection with extended blanking time;
CBL = 10nF @ Vin=265Vac and output power step from 3A to 4A
load
Application Note
27
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
11.8 Open loop protection (auto restart mode)
C1
C1
C2
C2
C3
C3
C4
C4
Channel 1; C1 : Drain to 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 to source voltage (VDS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
Blanking time to enter auto-restart mode : 20ms;
System enters auto-restart when VFB>4.5V, VBL > 4V
with defined blanking time.
Blanking time to enter auto-restart mode : 20ms;
System enters auto-restart when VFB>4.5V, VBL > 4V
with defined blanking time.
Figure 32 – Open loop protection @ Vin=85Vac; Rc1 is
Figure 33 – Open loop protection @ Vin=85Vac; Rc1 is
disconnected during system operation @ 3A load(CBL =100pF)
disconnected during system operation @ 3A load(CBL =100pF)
11.9 Vcc under voltage/Short optocoupler protection (auto restart mode)
C1
C1
C2
C2
C3
C3
C4
C4
Channel 1; C1 : Drain to 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 to 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 protection when Vcc <
10.5V
System enters auto-restart protection when Vcc <
10.5V
Figure 32 – Vcc overvoltage protection @ Vin=85Vac; Short
Figure 33 – Vcc overvoltage protection @ Vin=265Vac; Short
optocoupler is done by shorting the transistor (primary side) of the
optocoupler (CBL =100pF).
optocoupler is done by shorting the transistor (primary side) of the
optocoupler (CBL=100pF).
Application Note
28
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
11.10 External latch off enable
C1
C1
C2
C2
C3
C3
C4
C4
Channel 1; C1 : Drain to 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 to source voltage (VDS)
Channel 2; C2 : Supply voltage (VCC)
Channel 3; C3 : Feedback voltage (VFB)
Channel 4; C4 : BL voltage (VBL)
System enters latch-off mode when VBL< 0.1V
System enters latch-off mode when VBL< 0.1V
Figure 34 – Latch-off enable by triggering BL pin @ Vin=85Vac,
Figure 35 – Latch-off by triggering latch enable pin @
Vin=265Vac, short the BL pin to ground
short the BL pin to ground
11.11 Frequency Jittering
Channel 1; C1 : Drain to source voltage (VDS)
Channel 1; C1 : Drain to source voltage (VDS)
Frequency changing from 94.5kHz ~ 102.06KHz,
Jitter period is set at 4ms internally
Frequency changing from 93.5kHz ~ 101.5KHz, Jitter
period is set at 4ms internally
Figure 36 – Frequency change shown at VDS @ Vin=85Vac
and 15W load
Application Note
29
Figure 37 – Frequency change shown at VDS @ Vin=265Vac
and 15W load
2010-08-11
15W 5V Demoboard using ICE3A1065ELJ
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 that
case, three extra components (2 ceramic capacitors C17 & C18 and one resistor R19) are needed to add as
shown in the circuit diagram below (red block).
Figure 38 – 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 “CoolSET -F3 ICE3A1065ELJ Off-Line SMPS Current Mode
®
Controller with Integrated 650V CoolMOS and Startup Cell ( Latch and Frequency Jitter Mode )”
[2]
Kyaw Zin Min, Eric Kok Siu Kam, Infineon Technologies, Application Note “ICE3Axx65ELJ CoolSET
F3 latch & Jitter version Design Guide, AN-PS0030“
[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
30
®
2010-08-11
Similar pages