20W 12V SMPS Demo Board with ICE3RBR1765JG

20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
About this document
Scope and purpose
This document is an engineering report that describes universal input 20 W 12 V off-line flyback converter
power supply using Infineon CoolSET™ F3R family, ICE3RBR1765JG (DSO16/12). The converter is operated in
Discontinuous Conduction Mode, 65 kHz fixed frequency, low standby power and various mode of protections
for a high reliable system. This demo board is designed to evaluate the performance of ICE3RBR1765JG in ease
of use.
Intended audience
This document is intended for power supply design/application engineer, students, etc.) who wish to design
low cost and high reliable systems of off-line Switched Mode Power Supply (SMPS) for enclosed adapter, bluray/DVD player, set-top box, game console, smart meter, auxiliary power supply of white goods, PC, server, etc.
Table of Contents
About this document ...................................................................................................... 1
1
Abstract ........................................................................................................................ 3
2
Demonstrator board ...................................................................................................... 4
3
Specifications of Demonstrator Board.............................................................................. 5
4
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
Circuit description ......................................................................................................... 6
Line input ....................................................................................................................................................... 6
Start up ........................................................................................................................................................... 6
Operation mode ............................................................................................................................................ 6
Soft start ......................................................................................................................................................... 6
RCD clamper circuit ....................................................................................................................................... 6
Peak current control of primary current ..................................................................................................... 6
Output stage .................................................................................................................................................. 6
Feedback and regulation .............................................................................................................................. 7
Active burst mode ......................................................................................................................................... 7
Jittering and soft gate drive ......................................................................................................................... 7
Protection function ....................................................................................................................................... 7
5
Circuit diagram.............................................................................................................. 9
6
6.1
6.2
PCB layout ...................................................................................................................11
Top side ........................................................................................................................................................ 11
Bottom side .................................................................................................................................................. 11
7
Bill of material..............................................................................................................12
8
Transformer construction ..............................................................................................13
9
9.1
9.2
9.3
Test results ..................................................................................................................14
Efficiency, regulation and output ripple ................................................................................................... 14
Standby power............................................................................................................................................. 16
Line regulation ............................................................................................................................................. 16
Application Note
www.infineon.com
Please read the Important Notice and Warnings at the end of this document
Revision 1.0
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Abstract
9.4
9.5
9.6
9.7
9.8
9.9
Load regulation ........................................................................................................................................... 17
Maximum input power ................................................................................................................................ 17
ESD immunity (EN61000-4-2) ..................................................................................................................... 17
Surge immunity (EN61000-4-5) .................................................................................................................. 17
Conducted emissions (EN55022 class B) .................................................................................................. 18
Thermal measurement ............................................................................................................................... 20
10
10.1
10.2
10.3
10.4
10.5
10.6
10.7
10.8
10.9
10.10
10.11
10.12
Waveforms and scope plots ...........................................................................................21
Startup at low/high AC line input voltage with maximum load ............................................................. 21
Soft start ....................................................................................................................................................... 21
Frequency jittering ...................................................................................................................................... 22
Drain and current sense voltage at maximum load................................................................................. 22
Load transient response (Dynamic load from 10% to 100%) ................................................................. 23
Output ripple voltage at maximum load .................................................................................................. 23
Output ripple voltage at burst mode 1 W load ......................................................................................... 24
Active burst mode ....................................................................................................................................... 24
VCC over voltage protection....................................................................................................................... 25
Over load protection ................................................................................................................................... 25
VCC under voltage/Short optocoupler protection .................................................................................. 26
External auto restart enable....................................................................................................................... 26
11
References ...................................................................................................................27
Revision History ...........................................................................................................27
Application Note
2
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Abstract
1
Abstract
This document is an engineering report of an universal input 20 W 12 V off-line flyback converter power supply
utilizing F3R CoolSET™ ICE3RBR1765JG. The application demo board is operated in Discontinuous Conduction
Mode (DCM) and is running at 65 kHz fixed switching frequency. It has a single output voltage with secondary
side control regulation. It is especially suitable for small power supply such as enclosed adapter, blu-ray/DVD
player, set-top box, game console, smart meter or open frame auxiliary power supply of white goods, PC,
server, etc. Besides having the basic features of the F3 CoolSET™ such as Active Burst Mode, propagation delay
compensation, soft gate drive, auto restart protection for serious fault (Vcc over voltage protection, Vcc under
voltage protection, 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 key features of this product are the best-in-class
low standby power and the good EMI performance.
Application Note
3
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Demonstrator board
2
Demonstrator board
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.
Figure 1
DEMO-3RBR1765JG (Top View)
ICE3RBR1765JG
Figure 2
DEMO-3RBR1765JG (Bottom view)
Application Note
4
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Specifications of Demonstrator Board
3
Table 1
Specifications of Demonstrator Board
Specifications of DEMO-3RBR1765JG
Input voltage and frequency
85 VAC (60 Hz) ~ 265 VAC (50Hz)
Output voltage, current and power
12 V, 1.67 A, 20 W
Dynamic load response
(10% to 100% load, slew rate at 1.5 A/µs, 100 Hz)
±3% of nominal output voltage
(Vripple_p_p < 140 mV)
Output ripple voltage
(full load, 85 VAC ~ 265 VAC)
±1% of nominal output voltage
(Vripple_p_p< 60 mV)
Active mode four point average efficiency (25%, 50%, 75%,
100% load) (EU CoC Version 5, Tier 2)
> 86% at 115 VAC and 230 VAC
10% load efficiency (EU CoC Version 5, Tier 2)
> 80% at 115 VAC and 230 VAC
No load power consumption (EU CoC Version 5, Tier 1)
< 50 mW at 265 VAC
Conducted emissions (EN55022 class B)
Pass with 8 dB margin
ESD immunity (EN61000-4-2)
Level 3 (±12 kV for both contact and air
discharge)
Surge immunity (EN61000-4-5)
Installation class 3 (±1 kV for line to line and ±2 kV
for line to earth)
Form factor case size (L x W x H)
(99 x 44 x 24) mm3
Application Note
5
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Circuit description
4
Circuit description
4.1
Line input
The AC line input side comprises the input fuse F1 as over-current protection. The choke L11, X2-capacitors C11
and Y1-capacitor C12 act as EMI suppressors. Optional spark gap device SA1, SA2 and varistor VAR can absorb
high voltage stress during lightning surge test. After the bridge rectifier BR1 and the input bulk capacitor C13, a
voltage of 100 to 375 VDC is present which depends on input voltage.
4.2
Start up
Since there is a built-in startup cell in the ICE3RBR1765JG, no external start up resistor is required. The startup
cell is connecting the drain pin of the IC. Once the voltage is built up at the drain pin of the ICE3RBR1765JG, the
startup cell will charge up the VCC capacitor C16 and C17. When the VCC voltage exceeds the turn on threshold
18 V, the IC starts up. Then the VCC voltage is bootstrapped by the auxiliary winding to sustain the operation.
4.3
Operation mode
During operation, the VCC pin is supplied via a separate transformer winding with associated rectification D12
and buffering C16 and C17.In order not to exceed the maximum voltage at VCC pin due to poor coupling of
transformer winding, an external zener diode ZD11 and resistor R13 can be added.
4.4
Soft start
The soft start is a built-in function and is set at 20 ms.
4.5
RCD clamper circuit
While turns off the CoolMOS™, the clamper circuit R11, C15 and D11 absorbs the current caused by transformer
leakage inductance once the voltage exceeds designed clamp voltage. Finally drain to source voltage is lower
than the maximum break down voltage of CoolMOS™.
4.6
Peak current control of primary current
The CoolMOS™ drain source current is sensed via external shunt resistors R14 and R14A which determine the
tolerance of the current limit control. Since ICE3RBR1765JG 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, the patented propagation delay compensation is
implemented to ensure the maximum input power can be controlled in an even tighter manner. The demo
board shows approximately ±0.2.19% of average maximum input power (Figure 12).
4.7
Output stage
On the secondary side the power is coupled out by a schottky diode D21. The capacitor C22 provides energy
buffering following with the LC filter L21 and C24 to reduce the output voltage ripple considerably. Storage
capacitor C22 is selected to have an internal resistance as small as possible (ESR) to minimize the output
voltage ripple.
Application Note
6
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Circuit description
4.8
Feedback and regulation
The output voltage is controlled using a TL431 (IC21). This device incorporates the voltage reference as well as
the error amplifier and a driver stage. Compensation network C25, C26, R24, R25 and R26 constitutes the
external circuitry of the error amplifier of IC21. This circuitry allows the feedback to be precisely matched to
dynamically varying load conditions and provides stable control. The maximum current through the
optocoupler diode and the voltage reference is set by using resistors R22 and R23. Optocoupler IC12 is used for
floating transmission of the control signal to the “Feedback” input via capacitor C18 of the ICE3RBR1765JG
control device. The optocoupler used meets DIN VDE 884 requirements for a wider creepage distance.
4.9
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 V CCoff ≥ 10.5 V. During active burst mode, the
efficiency increases significantly and at the same time it supports low ripple on V OUT and fast response on load
jump. When the voltage level at FB falls below 1.35 V, the internal blanking timer starts to count. When it
reaches the built-in 20 ms 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 1.03 V to 0.34 V 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 450 µA. At burst mode, the FB voltage is
changing like a saw tooth between 3 and 3.5 V. To leave Burst Mode, FB voltage must exceed 4 V. It will reset
the Active Burst Mode and turn the SMPS into Normal Operating Mode. Maximum current can then be provided
to stabilize VOUT.
4.10
Jittering and soft gate drive
In order to reduce the emissions of electromagnetic interference (EMI) due to switching noise, the
ICE3RBR1765JG is implemented with frequency jittering and soft gate drive. The jitter frequency is internally
set to 65 kHz (± 2.6 kHz) and the jitter period is 4 ms.
4.11
Protection function
Protection is one of the major factors to determine whether the system is safe and robust. Therefore sufficient
protection is necessary. ICE3RBR1765JG provides all the necessary protections to ensure the system is
operating safely. The protections include VCC over voltage, over load/open loop, VCC under voltage/short
optocoupler, over temperature, external protection enable and brownout. 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 restart 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.
Application Note
7
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2016-04-15
20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Circuit description
Table 2
Protection function of ICE3RBR1765JG
Protection function
Failure condition
Vcc Overvoltage
1. VVCC > 20.5 V and FB > 4.0 V & during soft start period
2. VVCC > 25.5 V
Auto Restart
Overtemperature
(controller junction)
TJ > 130°C
Auto Restart
Overload / Open loop
VFB > 4.0 V, last for 20 ms and extended blanking time
(Extended blanking time counted from charging VBA from 0.9
V to 4.0 V )
Auto Restart
Vcc Undervoltage / Short
Optocoupler
VVCC < 10.5 V
Auto Restart
Auto Restart enable
VBA < 0.33 V
Auto Restart
Application Note
Protection Mode
8
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Circuit diagram
5
Figure 3
Circuit diagram
Schematic of DEMO-3RBR1765JG
Application Note
9
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Circuit diagram
Note:
1.
2.
3.
4.
5.
General guideline for layout design of Printed Cirduit Board (PCB):
Star ground at bulk capacitor C13: all primary grounds should be connected to the ground of bulk capacitor
C13 seperately in one point. It can reduce the switching noise going into the sensitive pins of CoolSET™ device
effectively. The primary star ground can be split into five groups as follows,
i. Signal ground includes all small signal grounds connecting to the CoolSET™ GND pin such as filter
capacitor ground C17, C18, C19 and opto-coupler ground.
ii. VCC ground includes the VCC capacitor ground C16 and the auxiliary winding ground, pin 5 of the
power transformer.
iii. Current Sense resistor ground includes current sense resistor R14 and R14A.
iv. EMI return ground includes Y capacitor C12.
v. DC ground from bridge rectifier, BR1
Filter capacitor close to the controller ground: Filter capacitors, C17, C18 and C19 should be placed as close to
the controller ground and the controller pin as possible so as to reduce the switching noise coupled into the
controller.
High voltage traces clearance: High voltage traces should keep enough spacing to the nearby traces.
Otherwise, arcing would incur.
i. 400 V traces (positive rail of bulk capacitor C13) to nearby trace: > 2.0 mm
ii. 600V traces (drain voltage of CoolSET™ IC11) to nearby trace: > 2.5 mm
Recommended minimum 232 mm2 copper area at drain pin to add on PCB for better thermal performance.
Power loop area (bulk capacitor C13, primary winding of the transformer TR1 (Pin 1 and 3), IC11 Drain pin,
IC11 CS pin and current sense resistor R14/R14A) should be as small as possible to minimize the switching
emission.
Application Note
10
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
PCB layout
6
PCB layout
6.1
Top side
Figure 4
Top side component legend
6.2
Figure 5
Bottom side
Bottom side copper and component legend
Application Note
11
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Bill of material
7
Bill of material
Table 3
Bill of material (V0.2)
No.
Designator
Description
Part Number
Manufacturer
1
BR1
600V/1A
S1VBA60
Shindengen
1
2
C11
0.1µF/305V
B329221C3104K
Epcos
1
3
C12
2.2nF/250V
DE1E3KX222MA4BN01F
Murata
1
4
C13
33µF/450V
450BXC33MEFC16X25
Rubycon
1
5
C15
1nF/600V
GRM31A7U2J102JW31D9
Murata
1
6
C16
22µF/50V
50PX22MEFC5X11
Rubycon
1
7
C17, C19
100nF/50V
GRM188R71H104KA93D
Murata
1
8
C18, C26
1nF/50V
GRM1885C1H102GA01D
Murata
2
9
C22
1200uF/16V
16ZLK1200M10X20
Rubycon
1
10
C24
680uF/16V
16ZLH680MEFC8X16
Rubycon
1
11
C25
220nF/50V
GRM188R71H224KAC4D
Murata
1
12
D11
0.8A/600V
D1NK60
Shindengen
1
13
D12
0.5A/200V
GL34D
1
14
D21
30A/100V
STPS30M100SFP
1
15
F1
1.6A/300V
36911600000
1
16
HS1
Heat Sink(D21)
577202B00000G
1
17
IC11
ICE3AR1765JG
ICE3AR1765JG
18
IC12
SFH617A-3(DIP-4)
SFH617A-3
1
19
IC21
TL431BVLPG(T0-92)
TL431BVLPG
1
20
L11
47mH/0.5A
B82731M2501A030
Epcos
1
21
L21
2.2uH/4.3A
744 746 202 2
Wurth Electronics
1
22
R11
100kΩ /2W/500V
PR02000201003JR500
23
R12
10Ω(0603)
24
R14
1.5Ω/0.33W/1206/±1%
ERJ8BQF1R5V
1
25
R14A
1.6Ω/0.33W/1206/±1%
ERJ8BQF1R6V
1
26
R22
820Ω/0603
1
27
R23
1.2kΩ/0603
1
28
R24
68kΩ/0603
1
29
R25
38kΩ/1%/0603
1
30
R26
10kΩ/1%/0603
1
31
TR1
516µH (70:12:15)
32
Test point
BA,FB,CS,Drain,Vcc,Gnd
33
VAR
0.25W/300V
B72207S2301K101
Epcos
1
34
(L N), (+12V Com)
Connector
691102710002(WE)
Wurth Electronics
2
Application Note
Infineon
Quantity
1
1
1
750343053
Wurth Electronics
1
1
12
Revision 1.0
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Transformer construction
8
Transformer construction
Core and material: EE20/10/6(EF20), TP4A (TDG)
Bobbin: 14-Pins, THT, Horizontal Version (070-5643)
Primary Inductance, LP=516 µH (±10%), measured between pin 1 and pin 3
Manufacturer and part number: Wurth Electronics Midcom (750343053)
Start
3
14
2
6
Figure 6
Stop
2
12
1
5
No. of turns
Wire size
35
1 x AWG#30
12
1 x Litz TIW (7 x AWG#31)
35
1 x AWG#30
15
1 x AWG#30
Layer
/2 Primary
Secondary
1
/2 Primary
Auxiliary
1
Transformer structure
Application Note
13
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Test results
9
Test results
9.1
Efficiency, regulation and output ripple
Table 4
Efficiency, regulation & output ripple
Input
(VAC/Hz)
85 VAC/60 Hz
115 VAC/60 Hz
230 VAC/50 Hz
265 VAC/50 Hz
Application Note
Pout
(W)
Efficienc
y
(η) (%)
49
2.06
86.00
0.42
13
5.08
86.36
12.09
0.83
16
10.03
85.62
17.92
12.09
1.25
18
15.11
84.33
24.45
12.08
1.67
22
20.17
82.51
0.0346
12.09
0.00
41
2.37
12.09
0.17
49
2.06
86.72
5.82
12.09
0.42
13
5.08
87.25
11.51
12.09
0.83
16
10.03
87.18
17.48
12.09
1.25
18
15.11
86.46
23.66
12.08
1.67
21
20.17
85.26
0.0375
12.09
0.00
44
2.40
12.09
0.17
54
2.06
85.64
5.88
12.09
0.42
13
5.08
86.36
11.40
12.09
0.83
15
10.03
88.02
17.12
12.09
1.25
18
15.11
88.27
22.95
12.08
1.67
20
20.17
87.90
0.0393
12.09
0.00
42
2.42
12.09
0.17
57
2.06
84.93
5.93
12.09
0.42
13
5.08
85.63
11.45
12.09
0.83
14
10.03
87.64
17.13
12.09
1.25
18
15.11
88.22
22.92
12.08
1.67
20
20.17
88.02
Pin
(W)
Vout
(VDC)
Iout
(A)
Vout_RPP
(mV)
0.0345
12.09
0.00
40
2.39
12.09
0.17
5.88
12.09
11.72
14
Average η
(%)
OLP Pin
(W)
OLP Iout
(A)
32.00
2.20
33.43
2.31
32.10
2.36
32.90
2.39
84.71
86.54
87.64
87.38
Revision 1.0
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Test results
Figure 7
Efficiency vs AC line input voltage
Figure 8
Efficiency vs output power at 115 VAC and 230 VAC line
Application Note
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Test results
9.2
Figure 9
Standby power
Standby power at no load vs AC line input voltage (measured by Yokogawa WT310HC power
meter - integration mode)
9.3
Figure 10
Line regulation
Line regulation Vout at full load vs AC line input voltage
Application Note
16
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Test results
9.4
Figure 11
Load regulation
Load regulation Vout vs output power
9.5
Figure 12
Maximum input power
Maximum input power (before over-load protection) vs AC line input voltage
9.6
ESD immunity (EN61000-4-2)
Pass EN61000-4-2 Level 3 (±12 kV for both contact and air discharge).
9.7
Surge immunity (EN61000-4-5)
Pass EN61000-4-5 Installation class 3 (±1 kV for line to line and ±2 kV for line to earth).
Application Note
17
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Test results
9.8
Conducted emissions (EN55022 class B)
The conducted EMI was measured by Schaffner (SMR4503) and followed the test standard of EN55022 (CISPR
22) class B. The demo board was set up at maximum load (10 W) with input voltage of 115 VAC and 230 VAC.
Figure 13
Conducted emissions(Line) at 115 VAC and maximum Load
Figure 14
Conducted emissions(Neutral) at 115 VAC and maximum Load
Application Note
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Test results
Figure 15
Conducted emissions(line) at 230 VAC and maximum Load
Figure 16
Conducted emissions(Neutral) at 230 V AC and maximum Load
Pass conducted emissions EN55022 (CISPR 22) class B with 8 dB margin (Quasi Peak).
Application Note
19
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20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Test results
9.9
Thermal measurement
The thermal test of open frame demo board was done using an infrared thermography camera (TVS-500EX) at
ambient temperature 25°C. The measurements were taken after two hours running at full load.
Table 5
Hottest temperature of demo board
No.
Major component
85 VAC (°C)
265 VAC (°C)
1
IC11 (ICE3RBR1765JG)
66.5
55.3
2
BR1
58.1
37.7
3
L11
81.5
37.7
4
TR1
59.4
58.3
5
D21
49.3
50.6
6
R11
54.5
49.1
7
R14
53.9
40.4
8
Ambient
25
25
.
Figure 17
85 VAC full load and 25⁰C ambient
265 VAC full load and 25⁰C ambient
PCB top side
PCB top side
PCB bottom side
PCB bottom side
Infrared thermal image of DEMO-3RBR1765JG
Application Note
20
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2016-04-15
20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Waveforms and scope plots
10
Waveforms and scope plots
All waveforms and scope plots were recorded with a TELEDYNELECROY 606Zi oscilloscope.
10.1
C1 (Yellow)
C2 (Purple)
C2 (Blue)
C2 (Green)
Startup at low/high AC line input voltage with maximum load
: Drain voltage (VD)
: Supply voltage (VVCC)
: Feedback voltage (VFB)
: BA voltage (VBA)
Startup time at 85 VAC & maximum load ≈ 538 ms
Figure 18 Startup
10.2
C1 (Yellow)
C2 (Purple)
C2 (Blue)
C2 (Green)
C1 (Yellow)
C2 (Purple)
C2 (Blue)
C2 (Green)
: Drain voltage (VD)
: Supply voltage (VVCC)
: Feedback voltage (VFB)
: BA voltage (VBA)
Startup time at 265 VAC & maximum load ≈ 538 ms
Soft start
: Current sense voltage (VCS)
: Supply voltage (VVCC)
: Feedback voltage (VFB)
: BA voltage (VBA)
Soft start time at 85 VAC and maximum load ≈ 19 ms
Figure 19 Soft start
Application Note
21
Revision 1.0
2016-04-15
20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Waveforms and scope plots
10.3
Frequency jittering
C1 (Yellow)
F2 (Yellow)
: Drain voltage (VDrain)
: Frequency track of C1
Frequency jittering at 85 VAC and maximum load ≈ 63.79 kHz ~ 68.87 kHz, Jitter period is ≈ 3.85 ms
Figure 20 Frequency jittering
10.4
Drain and current sense voltage at maximum load
C1 (Yellow)
C2 (Purple)
At 85 VAC
Figure 21
: Drain voltage (VDrain)
: Current sense voltage (VCS)
C1 (Yellow)
C2 (Purple)
: VDrain_peak ≈ 278 V
At 265 VAC
: On duty cycle ≈ 39%
Drain and current sense voltage at maximum load
Application Note
22
: Drain voltage (VDrain)
: Current sense voltage (VCS)
: VDrain_peak ≈ 542 V
: On duty cycle ≈ 11%
Revision 1.0
2016-04-15
20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Waveforms and scope plots
10.5
Load transient response (Dynamic load from 10% to 100%)
C1 (Yellow)
: Output ripple voltage (Vout)
C2 (Purple)
: Output current (Iout)
Vripple_pk_pk at 85 VAC ≈ 136 mV
(Load change from 10% to 100% at 85 VAC,100 Hz,0.4
A/μs slew rate)
Probe terminal end with decoupling capacitor of 0.1
μF(ceramic) and 1 μF(Electrolytic), 20 MHz filter
Figure 22 Load transient response
10.6
C1 (Yellow)
C2 (Purple)
C1 (Yellow)
: Output ripple voltage (Vout)
C2 (Purple)
: Output current (Iout)
Vripple_pk_pk at 265 VAC ≈ 136 mV
(Load change from10% to 100% at 265 VAC,100 Hz,0.4
A/μs slew rate)
Probe terminal end with decoupling capacitor of 0.1
μF(ceramic) and 1 μF(Electrolytic), 20 MHz filter
Output ripple voltage at maximum load
: Output current (Iout)
: Output ripple voltage (Vout)
C1 (Yellow)
C2 (Purple)
: Output current (Iout)
: Output ripple voltage (Vout)
Vripple_pk_pk at 85 VAC ≈ 20 mV
Vripple_pk_pk at 265 VAC ≈ 20 mV
Probe terminal end with decoupling capacitor of 0.1 Probe terminal end with decoupling capacitor of 0.1
μF(ceramic) and 1 μF(Electrolytic), 20 MHz filter
μF(ceramic) and 1 μF(Electrolytic), 20 MHz filter
Figure 23 Output ripple voltage at maximum load
Application Note
23
Revision 1.0
2016-04-15
20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Waveforms and scope plots
10.7
C1 (Yellow)
C2 (Purple)
Output ripple voltage at burst mode 1 W load
: Output current (Iout)
: Output ripple voltage (Vout)
C1 (Yellow)
C2 (Purple)
: Output current (Iout)
: Output ripple voltage (Vout)
Vripple_pk_pk at 85 VAC ≈ 47 mV
Vripple_pk_pk at 265 VAC ≈ 51 mV
Probe terminal end with decoupling capacitor of 0.1 Probe terminal end with decoupling capacitor of 0.1
μF(ceramic) and 1 μF(Electrolytic), 20 MHz filter
μF(ceramic) and 1 μF(Electrolytic), 20 MHz filter
Figure 24 Output ripple voltage at burst mode 1 W load
10.8
C1 (Yellow)
C2 (Purple)
C2 (Blue)
C2 (Green)
Active burst mode
: Current sense voltage (VCS)
: Supply voltage (VVCC)
: Feedback voltage (VFB)
: BA voltage (VBA)
C1 (Yellow)
C2 (Purple)
C2 (Blue)
C2 (Green)
: Current sense voltage (VCS)
: Supply voltage (VVCC)
: Feedback voltage (VFB)
: BA voltage (VBA)
Condition to enter burst: VFB < 1.35 V and last for 20 ms Condition to leave burst: VFB > 4.0 V
(load change form full load to 1 W load)
(load change form 1 W load to full load)
Figure 25 Active burst mode at 85 VAC
Application Note
24
Revision 1.0
2016-04-15
20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Waveforms and scope plots
10.9
VCC over voltage protection
VCC OVP1
VCC OVP2
C1 (Yellow)
C2 (Purple)
C2 (Blue)
C2 (Green)
: Drain voltage (VD)
: Supply voltage (VVCC)
: Feedback voltage (VFB)
: BA voltage (VBA)
Condition to enter VCC over voltage protection: VCC > 25.5 V
VCC > 20.5 V and VFB > 4.0 V and during soft start
(Short the diode of optocoupler(Pin 1 and 2 of IC12) during system operating at 85 VAC, 0.4 A load)
Figure 26 VCC overvoltage protection
10.10
Over load protection
C1 (Yellow)
: Drain voltage (VD)
C2 (Purple)
: Supply voltage (VVCC)
C2 (Blue)
: Feedback voltage (VFB)
C2 (Green)
: BA voltage (VBA)
Condition to enter over load protection: VFB > 4.0 V, last for 20 ms and extended blanking time
(output load change from full load to 3 A at 85 VAC)
Figure 27 Over load protection
Application Note
25
Revision 1.0
2016-04-15
20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
Waveforms and scope plots
10.11
VCC under voltage/Short optocoupler protection
C1 (Yellow)
: Drain voltage (VD)
C2 (Purple)
: Supply voltage (VVCC)
C2 (Blue)
: Feedback voltage (VFB)
C2 (Green)
: BA voltage (VBA)
Condition to enter VCC under voltage protection: VCC < 10.5 V
(short the transistor of optocoupler(Pin 3 and 4 of IC12) during system operating at full load and release at 85
VAC)
Figure 28 VCC under voltage/short optocoupler protection
10.12
External auto restart enable
C1 (Yellow)
: Drain voltage (VD)
C2 (Purple)
: Supply voltage (VVCC)
C2 (Blue)
: Feedback voltage (VFBB)
C2 (Green)
: BA voltage (VBA)
Condition to enter external protection enable: VBA < 0.33 V
(short BA pin to Gnd by 10 Ω resistor during system operating at full load and 85 VAC)
Figure 29 External auto restart enable
Application Note
26
Revision 1.0
2016-04-15
20W 12V SMPS Demo Board with ICE3RBR1765JG
AN-DEMO-3RBR1765JG
References
11
References
[1]
ICE3RBR1765JG datasheet, Infineon Technologies AG
[2]
AN-PS0025-CoolSET F3R DIP-8, DIP-7, DSO-16/12 new jitter version design guide-V2.2
Revision History
Major changes since the last revision
Page or Reference
--
Application Note
Description of change
First release.
27
Revision 1.0
2016-04-15
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Edition 2016-04-15
Published by
Infineon Technologies AG
81726 Munich, Germany
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2016 Infineon Technologies AG.
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