POWERINT DER-53

Design Example Report
Title
20W Dual Output Power Supply using
TOP247Y
Specification
Input: 85-265 VAC
Output: 12V/1.25A, -14V/0.4A
Application
Cooking Range
Author
Power Integrations Applications Department
Document
Number
DER-53
Date
April 20, 2005
Revision
1.0
Summary and Features
This document is an engineering prototype report describing a 20W power supply
utilizing a TOP247Y. This power supply will be used in a cook top application where the
maximum ambient temperature can reach 105C.
•
•
•
•
105C Ambient Operation
TOP247Y operates at 66kHz to reduce switching losses and EMI filter size
Compact PCB 7” X 3”
High efficiency >85% at full load
The products and applications illustrated herein (including circuits external to the products and transformer
construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign
patent applications assigned to Power Integrations. A complete list of Power Integrations’ patents may be found at
www.powerint.com.
Power Integrations
5245 Hellyer Avenue, San Jose, CA 95138 USA.
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
Table Of Contents
1
2
3
4
Introduction................................................................................................................. 4
Power Supply Specification ........................................................................................ 5
Schematic................................................................................................................... 6
Circuit Description ...................................................................................................... 7
4.1
Input EMI Filtering ............................................................................................... 7
4.2
TOPSwitch Primary ............................................................................................. 7
4.3
Output Rectification ............................................................................................. 7
4.4
Output Feedback................................................................................................. 7
5 PCB Layout ................................................................................................................ 9
6 Bill Of Materials ........................................................................................................ 10
7 Transformer Specification......................................................................................... 12
7.1
Electrical Diagram ............................................................................................. 12
7.2
Electrical Specifications..................................................................................... 12
7.3
Materials............................................................................................................ 12
7.4
Transformer Build Diagram ............................................................................... 13
7.5
Transformer Construction.................................................................................. 13
7.6
Bobbin Drawing ................................................................................................. 14
7.7
Transformer Spreadsheets................................................................................ 15
8 Performance Data .................................................................................................... 17
8.1
Efficiency........................................................................................................... 17
8.2
Minimum Load Input Power............................................................................... 17
8.3
Regulation ......................................................................................................... 18
8.3.1
Load ........................................................................................................... 18
8.3.2
Line ............................................................................................................ 18
9 Thermal Performance............................................................................................... 19
10
Waveforms............................................................................................................ 20
10.1 Drain Voltage and Current, Normal Operation .................................................. 20
10.2 Output Voltage Start-up Profile ......................................................................... 20
10.3 Drain Voltage and Current Start-up Profile........................................................ 21
10.4 Load Transient Response (75% to 100% Load Step) ....................................... 21
10.5 Output Ripple Measurements............................................................................ 22
10.5.1 Ripple Measurement Technique ................................................................ 22
10.5.2 Measurement Results ................................................................................ 23
11
Control Loop Measurements................................................................................. 24
11.1 85 VAC Input..................................................................................................... 24
11.2 265 VAC Input................................................................................................... 24
12
Conducted EMI ..................................................................................................... 25
13
Revision History.................................................................................................... 26
Page 2 of 27
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
Important Note:
Although this board is designed to satisfy safety isolation requirements, the engineering
prototype has not been agency approved. Therefore, all testing should be performed
using an isolation transformer to provide the AC input to the prototype board.
Design Reports contain a power supply design specification, schematic, bill of materials,
and transformer documentation. Performance data and typical operation characteristics
are included. Typically only a single prototype has been built.
Page 3 of 27
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
1 Introduction
This document is an engineering prototype report describing a 20W power supply utilizing
a TOP247Y. This power supply will be used in a cook top application where the
maximum ambient temperature can reach 105C.
The document contains the power supply specification, schematic, bill-of-materials,
transformer documentation, printed circuit layout, and performance data.
Figure 1 – Populated Circuit Board Photograph.
Page 4 of 27
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
2 Power Supply Specification
Description
Input
Voltage
Frequency
No-load Input Power (230 VAC)
Output
Output Voltage 1
Output Ripple Voltage 1
Output Current 1
Output Voltage 2
Output Ripple Voltage 2
Output Current 2
Total Output Power
Continuous Output Power
Peak Output Power
Efficiency
Symbol
Min
Typ
Max
Units
Comment
VIN
fLINE
85
47
265
64
0.3
VAC
Hz
W
2 Wire – no P.E.
50/60
VOUT1
VRIPPLE1
IOUT1
VOUT2
VRIPPLE2
IOUT2
12
50
1.25
0.25
-14
100
0.4
0.05
POUT
20.6
40
η
85
V
mV
A
V
mV
A
W
W
%
± 5%
20 MHz bandwidth
± 10%
20 MHz bandwidth
Measured at POUT (20.6 W), 25 oC
Environmental
Conducted EMI
Meets CISPR22B / EN55022B
Designed to meet IEC950, UL1950
Class II
Safety
Surge
TBD
kV
Surge
TBD
kV
Ambient Temperature
Page 5 of 27
TAMB
0
105
o
C
1.2/50 µs surge, IEC 1000-4-5,
Series Impedance:
Differential Mode: 2 Ω
Common Mode: 12 Ω
100 kHz ring wave, 500 A short
circuit current, differential and
common mode
Free convection, sea level
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
3 Schematic
Figure 2 – Schematic.
Page 6 of 27
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
4 Circuit Description
The schematic in Figure 2 shows an off-line Flyback converter using the TOP247Y. The
circuit is designed for 85 VAC to 265 VAC input and provides two outputs; +12V @ 1.25A
and –14V @ 0.4A.
4.1 Input EMI Filtering
Capacitor C1 and the leakage inductance of L1, filter differential-mode conducted EMI.
Inductor L1 acts to reduce common-mode conducted EMI.
4.2 TOPSwitch Primary
The discrete full bridge rectifier bridge comprised of D1-D4 and C2 provide a high voltage
DC BUS for the primary circuitry. C3 bypasses the high voltage DC rail. Resistor R1
provides damping that reduces mid-frequency conducted EMI. The DC rail is applied to
the primary winding of T1. The other side of the transformer primary is driven by the
integrated MOSFET in U1. Diode D6 and D5 clamp leakage spikes generated when the
MOSFET in U1 switches off. Capacitor C4 reduces the operating temperature of D5 by
bypassing the leading edge of the primary leakage spike away from D5. Resistor R2
provides damping to reduce drain ringing. Resistor R3 sets the low-line turn-on threshold
to approximately 69 VAC, and also sets the over voltage shutdown level to approximately
320 VAC. R4 sets the U1 current limit to approximately 40% of its nominal value. This
limits the output power delivered during fault conditions. C5 bypasses the U1 CONTROL
pin. C6 has 3 functions. It provides the energy required by U1 during startup, sets the
auto-restart frequency during fault conditions, and also acts to roll off the gain of U1 as a
function of frequency. R5 adds a zero to stabilize the power supply control loop. Diode
D7 and C19 provide rectified and filtered bias power for U2 and U1.
4.3 Output Rectification
The output of T1 is rectified and filtered by D8, C10-C11 and D9, C14. Inductor L2 (L3),
C12 (C15), and C13 (C16) provide additional high frequency filtering. Resistor R6 (R7)
and C8 (C9) provide snubbing for D8 (D9). Choosing the proper snubber values is
important for low zero-load power consumption and for high frequency EMI suppression.
The snubber components were chosen so that the turn-on voltage spike at the D8 (D9)
anode is slightly under-damped. Increasing C8 and reducing R6 will improve damping
and high frequency EMI, at the cost of higher zero-load power consumption.
4.4 Output Feedback
Resistors R11 and R12 divide down the supply output voltage and apply it to the
reference pin of error amplifier U3. Shunt regulator U3 drives Optocoupler U2 through
resistor R6 to provide feedback information to the U1 CONTROL pin. The Optocoupler
output also provides power to U1 during normal operating conditions. Diode D10 and C18
apply drive to the Optocoupler during supply startup to eliminate output voltage
overshoot. Diode D10 isolates C18 from the supply feedback loop after startup. Resistor
R9 discharges C18 when the supply is off.
Page 7 of 27
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
Components C6, C17, R5, R10 and R8 all play a role in compensating the power supply
control loop. Capacitor C6 rolls off the gain of U1 at relatively low frequency. Resistor
R5 provides a zero to cancel the phase shift of C6. Resistor R8 sets the gain of the direct
signal path from the supply output through U2 and U3. Components C17 and R10 roll off
the gain of U3
Page 8 of 27
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
5 PCB Layout
Figure 3 – Printed Circuit Layout.
Page 9 of 27
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
6 Bill Of Materials
Item
1
QTY Part Reference
1
C1
Mfg Part Number
Description
Mfg
Value
ECQ-U2A224ML
220nF
2
1
C2
UVZ2G221MRD
220nF, 275 VAC, Film, X2
Panasonic
220uF, 450V, Electrolytic, Gen.
Purpose
Nichicon
3
1
C3
5GASS20
20nF, 500 V, Disc Ceramic
Vishay
20nF
220uF
4
1
C4
ECK-D3A472KBN
4.7nF, 1 kV, Disc Ceramic
Panasonic
4.7nF
5
4
C5 C13 C16 C17
ECU-S1H104KBB
Panasonic
100nF
United Chemi-Con
47uF
Vishay
2.2nF
NIC Components Corp
470pF
United Chemi-Con
1000uF
United Chemi-Con
100uF
United Chemi-Con
470uF
United Chemi-Con
10uF
6
1
C6
KME16VB47RM5X11LL
100nF, 50 V, Ceramic, X7R
47uF, 16 V, Electrolytic, Gen.
Purpose, (5 x 11)
7
1
C7
440LD22
2.2nF, Ceramic, Y1
8
2
C8 C9
NCD471K1KVY5F
9
2
C10 C11
10
2
C12 C15
11
1
C14
12
1
C18
13
1
C19
470pF, 1 kV, Disc Ceramic
1000uF, 35 V, Electrolytic, Low
ESR, 30mOhm, (12.5 x 25)
LXZ35VB102MK25LL
100uF, 35 V, Electrolytic, Gen.
KME35VB101M6X11LL Purpose, (8 x 11.5)
470uF, 35 V, Electrolytic, Very
KZE35VB471MJ20LL
Low ESR, 23mOhm, (10 x 20)
10uF, 50 V, Electrolytic, Gen.
KME50VB10RM5X11LL Purpose, (5 x 11)
1uF, 50 V, Electrolytic, Gen.
KMG50VB1R0M5X11LL Purpose, (5 x 11)
14
4
D1 D2 D3 D4
1N5407
15
1
D5
P6KE200A
16
1
D6
UF4005
17
2
D7 D10
1N4148
18
1
D8
MBR2060CT
19
1
D9
SB580
80 V, 5 A, Schottky, DO-201AD Vishay
SB580
20
1
F1
3,701,315,041
Wickman
3.15 A
21
1
J1
26-48-1045
Molex
CON4
22
1
J2
26-48-1031
Molex
CON3
23
1
L1
ELF18N012A
3.15 A, 250V,Fast, TR5
CONN HEADER 4POS(1 X 4)
.156 VERT TIN
CONN HEADER 3POS(1 X 3)
.156 VERT TIN
9.5mH, 1.2 A, Common Mode
Choke
Panasonic
9.5mH
24
1
L2
ELC08D3R3E
3.3uH, 5.7 A
Panasonic
3.3uH
25
1
L3
822LY-3R3M
3.3uH, 2.66 A
Toko
3.3uH
26
1
R1
CFR-25JB-2R2
2.2 R, 5%, 1/4 W, Carbon Film
Yageo
2.2
27
1
R2
CFR-50JB-68K
68 k, 5%, 1/2 W, Carbon Film
Yageo
28
1
R3
CFR-50JB-2M2
2.2 M, 5%, 1/2 W, Carbon Film Yageo
2.2 M
28 k 1%
United Chemi-Con
800 V, 3 A, Rectifier, DO-201AD Vishay
200 V, 5 W, 5%, DO204AC
(DO-15)
Vishay
600 V, 1 A, Ultrafast Recovery,
75 ns, DO-41
Vishay
75 V, 300mA, Fast Switching,
DO-35
Vishay
60 V, 20 A, Dual Schottky, TO220AB
Vishay
1uF
1N5407
P6KE200A
UF4005
1N4148
MBR2060CT
68 k
29
1
R4
MFR-25FBF-13K0
13 k, 1%, 1/4 W, Metal Film
Yageo
30
1
R5
CFR-12JB-6R8
6.8 R, 5%, 1/8 W, Carbon Film
Yageo
6.8
31
2
R6 R7
CFR-25JB-33R
33 R, 5%, 1/4 W, Carbon Film
Yageo
33
32
1
R8
CFR-12JB-470R
470 R, 5%, 1/8 W, Carbon Film Yageo
33
1
R9
CFR-12JB-15K
15 k, 5%, 1/8 W, Carbon Film
Yageo
15 k
34
1
R10
CFR-12JB-3K3
3.3 k, 5%, 1/8 W, Carbon Film
Yageo
3.3 k
35
1
R11
MFR-25FBF-38K3
38.3 k, 1%, 1/4 W, Metal Film
Yageo
38.3 k
36
1
R12
MFR-25FBF-10K0
10 k, 1%, 1/4 W, Metal Film
Yageo
10 k
37
1
R13
CFR-12JB-1K0
1 k, 5%, 1/8 W, Carbon Film
Yageo
1k
Page 10 of 27
470
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
38
1
RT1
CL150
NTC Thermistor, 5 Ohms, 4.7 A Thermometrics
5 ohm
39
1
RV1
V275LA20A
Littlefuse
275Vac
40
1
T1
YC-3508
Ying Chin
EER35
41
1
U1
TOP247Y
Power Integrations
TOP247Y
42
1
U2
ISP817D, PC817X4
Isocom, Sharp
PC817D
43
1
U3
TL431CLP
275 V, 75 J, 14 mm, RADIAL
Bobbin, EER35, Vertical, 14
pins
TOPSwitch-GX, TOP247Y,
TO220-7C
Opto coupler, 35 V, CTR 300600%, 4-DIP
2.495 V Shunt Regulator IC,
2%, 0 to 70C, TO-92
Texas Instruments
TL431
Page 11 of 27
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
7 Transformer Specification
7.1
Electrical Diagram
Figure 4 –Transformer Electrical Diagram
7.2
Electrical Specifications
Electrical Strength
Primary Inductance
Resonant Frequency
Primary Leakage Inductance
7.3
1 second, 60 Hz, from Pins 1-7 to Pins 8-14
Pins 1-4, all other windings open, measured at 66
kHz, 0.4 VRMS
Pins 1-4, all other windings open
Pins 1-4, with Pins 8-14 shorted, measured at
66 kHz, 0.4 VRMS
3000 VAC
683 µH, -/+10%
500 kHz (Min.)
4 µH (Max.)
Materials
Item
[1]
[2]
[3]
[4]
[5]
[6]
Description
2
Core: EER35 PC40 or equivalent, Al=124nH/T
Bobbin: Yin-Ching P/N: YC-3508 14-pin
Magnet Wire: #25 AWG Heavy Build
Magnet Wire: #26 AWG Heavy Build
Tape: 3M Tape
Varnish
Page 12 of 27
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DER-53
7.4
105C Dual Output Cook top Power Supply
April 20, 2005
Transformer Build Diagram
Figure 5 – Transformer Build Diagram.
7.5
Transformer Construction
Bobbin Preparation
Margin Tape
½ Primary
Basic Insulation
Bias Winding
Basic Insulation
Secondary Winding
Basic Insulation
Secondary Winding
Shield Winding
½ Primary
Outer Wrap
Final Assembly
Page 13 of 27
Pull Pin 9 on bobbin [2] to provide polarization. Bobbin pin-out is shown
below.
Apply 3 mm wide margin to both sides of bobbin using item [5]. Match
height of primary and bias windings.
Start at Pin 4. Wind 37 turns of #25 AWG in 1 layer, finish on Pin 3.
Use one layer of tape [5] for basic insulation.
Starting at Pin 6, wind 9 quadfilar turns of #25 AWG. Spread turns evenly
across bobbin width. Finish on Pin 7.
Use three layers of tape [5] for basic insulation.
Start at Pins 10 and 11. Wind 12 trifilar turns of #25 AWG uniformly on a
single layer. Finish on Pin 8.
Use three layers of tape [5] for basic insulation.
Start at Pins 13 and 14. Wind 10 quadfilar turns of #25 AWG uniformly on
a single layer. Finish on Pins 10 and 11.
Start at Pin 1. Wind 11 quadfilar turns of #26 AWG in 1 layer, finish on
Pin 5.
Start at Pin 3. Wind 37 turns of #25 AWG in 1 layer, finish on Pin 1.
Wrap windings with 3 layers of tape [5].
Assemble and secure core halves so that the tape wrapped E core is at
the bottom of the transformer. Dip varnish cores.
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DER-53
7.6
105C Dual Output Cook top Power Supply
April 20, 2005
Bobbin Drawing
Page 14 of 27
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DER-53
7.7
105C Dual Output Cook top Power Supply
April 20, 2005
Transformer Spreadsheets
Page 15 of 27
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DER-53
Page 16 of 27
105C Dual Output Cook top Power Supply
April 20, 2005
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
8 Performance Data
All measurements performed at room temperature, 60 Hz input frequency.
8.1
Efficiency
90.00%
89.00%
88.00%
Efficiency ( η )
87.00%
86.00%
85.00%
84.00%
83.00%
Full Load (21W)
82.00%
2 X Full Load (42W)
81.00%
80.00%
50
100
150
200
250
300
Input Voltage (VAC)
Figure 6 - Efficiency vs. Input Voltage, Room Temperature, 60 Hz.
8.2
Minimum Load Input Power
5.8
5.7
Input Power (W)
5.6
5.5
5.4
5.3
5.2
5.1
5
50
100
150
200
250
300
Input Voltage (VAC)
Figure 7 - Input Power vs. Input Line Voltage, Room Temperature, 60 Hz.
Page 17 of 27
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DER-53
8.3
105C Dual Output Cook top Power Supply
April 20, 2005
Regulation
8.3.1 Load
Regulation Tolerance (%)
120.00%
115.00%
110.00%
105.00%
100.00%
+12V @ 120VAC
95.00%
-14V @ 120VAC
90.00%
+12V @ 240AC
85.00%
-14V @ 240VAC
80.00%
min
loa
d
min
+12
/
ma
ma
x -1
x+
12/
m
4
ma
in 1
x+
2X
12/
m
4
ax
loa
d
-14
Load Condition
Figure 8 – Load Regulation, Room Temperature.
8.3.2 Line
105.00%
Regulation Tolerance (%)
104.50%
104.00%
103.50%
103.00%
102.50%
+12V Output
102.00%
-14V Output
101.50%
101.00%
100.50%
100.00%
50
100
150
200
250
300
Input Voltage (VAC)
Figure 9 – Line Regulation, Room Temperature, Full Load.
Page 18 of 27
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105C Dual Output Cook top Power Supply
April 20, 2005
9 Thermal Performance
Unit was placed into a box in a thermal chamber at 105ºC and allowed to reach thermal
equilibrium. The unit was placed in a box to prevent any airflow from the thermal chamber
fan from reaching the unit. Thermocouples were placed on the TOPSwitch, output
rectifier and transformer. At full rated load the unit does not have any appreciable
temperature rise over the ambient.
Temperature (ºC)
Item
Page 19 of 27
115VAC
230VAC
Ambient
105
105
Transformer (T1)
109
105
TOPSwitch (U1)
105
105
Rectifier (D8)
105
105
Capacitor (C10)
105
105
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
10 Waveforms
10.1 Drain Voltage and Current, Normal Operation
Figure 10 - 85 VAC, Full Load.
Upper: IDRAIN, 0.5 A / div
Lower: VDRAIN, 100 V, 5 µs / div
Figure 11 - 265 VAC, Full Load
Upper: IDRAIN, 0.5 A / div
Lower: VDRAIN, 200 V / div, 5 µs / div
10.2 Output Voltage Start-up Profile
+12VDC
+12VDC
-14VDC
-14VDC
5V/div
5V/div
Figure 12 - Start-up Profile, 85VAC
2 V, 5 ms / div.
Page 20 of 27
Figure 13 - Start-up Profile, 265 VAC
2 V, 5 ms / div.
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
10.3 Drain Voltage and Current Start-up Profile
Figure 14 - 85 VAC Input and Maximum Load.
Upper: IDRAIN, 0.5 A / div.
Lower: VDRAIN, 100 V & 1 ms / div.
Figure 15 - 265 VAC Input and Maximum Load.
Upper: IDRAIN, 1 A / div.
Lower: VDRAIN, 200 V & 1 ms / div.
10.4 Load Transient Response (75% to 100% Load Step)
In the figures shown below, signal averaging was used to better enable viewing the load
transient response. The oscilloscope was triggered using the load current step as a
trigger source. Since the output switching and line frequency occur essentially at random
with respect to the load transient, contributions to the output ripple from these sources
will average out, leaving the contribution only from the load step response.
Figure 16 – Transient Response, 115 VAC, 75-10075% Load Step.
Top: Load Current, 200mA/div.
Bottom: Output Voltage
50 mV, 500 µs / div.
Page 21 of 27
Figure 17 – Transient Response, 230 VAC, 75-10075% Load Step
Upper: Load Current, 200mA/ div.
Bottom: Output Voltage
50 mV, 2 ms / div.
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
10.5 Output Ripple Measurements
10.5.1 Ripple Measurement Technique
For DC output ripple measurements, a modified oscilloscope test probe must be utilized
in order to reduce spurious signals due to pickup. Details of the probe modification are
provided in Figure 18 and Figure 19.
The 5125BA probe adapter is affixed with two capacitors tied in parallel across the probe
tip. The capacitors include one (1) 0.1 µF/50 V ceramic type and one (1) 1.0 µF/50 V
aluminum electrolytic. The aluminum electrolytic type capacitor is polarized, so
proper polarity across DC outputs must be maintained (see below).
Probe Ground
Probe Tip
Figure 18 - Oscilloscope Probe Prepared for Ripple Measurement. (End Cap and Ground Lead Removed)
Figure 19 - Oscilloscope Probe with Probe Master 5125BA BNC Adapter. (Modified with wires for probe
ground for ripple measurement, and two parallel decoupling capacitors added)
Page 22 of 27
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
10.5.2 Measurement Results
Figure 20 – 12V Ripple, 85 VAC, Full Load.
2 ms, 20 mV / div
Page 23 of 27
Figure 21 - 12V Ripple, 265 VAC, Full Load.
2 ms, 20 mV / div
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
11 Control Loop Measurements
11.1 85 VAC Input
Figure 22 - Gain-Phase Plot,
½ Load (10W)
Scale:
Gain = 10 dB/div, Phase = 40 °/div.
Crossover Frequency = 274Hz
Phase Margin = 46.9°
Figure 23 - Gain-Phase Plot,
Full Load (20W)
Scale:
Gain = 10 dB/div, Phase = 40 °/div.
Crossover Frequency = 403.7Hz
Phase Margin = 75.9°
Figure 24 - Gain-Phase Plot,
2X Load (40W)
Scale:
Gain = 10 dB/div, Phase = 40 °/div.
Crossover Frequency = 1.75 kHz Phase
Margin = 16.9°
11.2 265 VAC Input
Figure 25 - Gain-Phase Plot,
½ Load (10W)
Scale:
Gain = 10 dB/div, Phase = 40 °/div.
Crossover Frequency = 528.3Hz
Phase Margin = 75.1°
Figure 26 - Gain-Phase Plot,
Full Load (20W)
Scale:
Gain = 10 dB/div, Phase = 40 °/div.
Crossover Frequency = 950.4Hz
Phase Margin = 52.8°
Figure 27 - Gain-Phase Plot,
2X Load (40W)
Scale:
Gain = 10 dB/div, Phase = 40 °/div.
Crossover Frequency = 1.61 kHz
Phase Margin = 69.6°
The power supply has very good stability criteria over the intended operating input
voltage and output power range.
Page 24 of 27
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
12 Conducted EMI
A conducted EMI scan of the prototype was taken to determine the effectiveness of the
input filter, transformer construction and layout. The following plots show the Peak
performance of the converter against quasi-peak (QP) and average (AVG) limits of
EN55022 Class B. Both scans were taken at 115VAC/60Hz input with peak load applied
to both output rails.
Figure 28 - Conducted EMI, Maximum Steady State Load (Line)
Figure 29 - Conducted EMI, Maximum Steady State Load (Neutral)
Since the peak scan is below the average limits, it is expected that the QP scans would
have greater than 10db of margin below the limits.
Page 25 of 27
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
13 Revision History
Date
April 20, 2005
Page 26 of 27
Author
EC/RSP
Revision
1.0
Description & changes Reviewed
Initial release
VC / AM
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DER-53
105C Dual Output Cook top Power Supply
April 20, 2005
For the latest updates, visit our Web site: www.powerint.com
Power Integrations may make changes to its products at any time. Power Integrations has no liability arising from your
use of any information, device or circuit described herein nor does it convey any license under its patent rights or the
rights of others. POWER INTEGRATIONS MAKES NO WARRANTIES HEREIN AND SPECIFICALLY DISCLAIMS
ALL WARRANTIES INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS.
PATENT INFORMATION
The products and applications illustrated herein (including circuits external to the products and transformer
construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign
patent applications assigned to Power Integrations. A complete list of Power Integrations’ patents may be found at
www.powerint.com.
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Integrations. PI Expert and DPA-Switch are trademarks of Power Integrations.
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