PDF - Power Integrations - AC

DESIGN EXAMPLE REPORT
Title
65 W Adapter Using TOP258EN
Specification 90 – 265 VAC Input; 19 VDC, 3.42 A Output
Application
Notebook Adapter
Author
Applications Engineering Department
Document
Number
DER-197
Date
July 17, 2008
Revision
1.0
Summary and Features
•
•
•
•
•
•
•
Very compact, low parts-count design
• Internal current limit reduction eliminates need for current limit on secondary-side
• Primary side overvoltage protection (OVP) eliminates second optocoupler
700 V MOSFET reduces solution cost
• Allows lower-cost Schottky output diode: 60 V, 20 A replaces 100 V, 40 A
• 132 kHz operation reduces transformer size, reducing cost
• Low MOSFET capacitance allows higher frequency operation without efficiency penalty
Highly energy efficient
• Very low no-load input power: <200 mW @ 265 VAC
• High full-load efficiency: >86%
• High average efficiency: >87%
Excellent transient load response
Hysteretic thermal protection
Over-load protection with automatic recovery
Latching fault protection
PATENT INFORMATION
The products and applications illustrated herein (including transformer construction and circuits external to the products) 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 grants its customers a license under
certain patent rights as set forth at <http://www.powerint.com/ip.htm>.
Power Integrations
5245 Hellyer Avenue, San Jose, CA 95138 USA.
Tel: +1 408 414 9200 Fax: +1 408 414 9201
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DER-197 – TOP258EN 65 W Adapter
17-Jul-08
Table of Contents
1
2
3
4
Introduction.................................................................................................................4
Power Supply Specification ........................................................................................6
Schematic...................................................................................................................7
Circuit Description ......................................................................................................8
4.1
General................................................................................................................8
4.2
Energy Efficiency.................................................................................................8
4.3
Output Power Limiting with Line Voltage .............................................................8
4.4
Output Overvoltage Protection ............................................................................8
4.5
Thermal Overload Protection...............................................................................8
4.6
AC Input and EMI Filtering ..................................................................................8
4.7
TOP258EN and Primary......................................................................................9
4.8
Output Regulation ...............................................................................................9
5 PCB Layout ..............................................................................................................10
6 Bill of Materials .........................................................................................................11
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..................................................................................14
8 Transformer Spreadsheet.........................................................................................15
9 Performance Data ....................................................................................................18
9.1
Efficiency ...........................................................................................................18
9.1.1
Active Mode CEC Measurement Data........................................................19
9.2
Output Diode Efficiency Comparison.................................................................20
9.3
No-load Input Power..........................................................................................21
9.4
Available Standby Output Power.......................................................................22
9.5
Regulation .........................................................................................................23
9.5.1
Load ...........................................................................................................23
9.5.2
Line ............................................................................................................23
10
Thermal Performance ...........................................................................................24
11
Waveforms............................................................................................................25
11.1 Drain Voltage and Current, Normal Operation...................................................25
11.2 Output Voltage Start-up Profile..........................................................................25
11.3 Drain Voltage and Current Start-up Profile ........................................................26
11.4 Load Transient Response (50% to 100% Load Step) .......................................26
11.5 Output Ripple Measurements............................................................................27
11.5.1 Ripple Measurement Technique ................................................................27
11.5.2 Measurement Results ................................................................................28
12
Control Loop Measurements.................................................................................29
12.1 115 VAC Maximum Load...................................................................................29
12.2 230 VAC Maximum Load...................................................................................30
13
Conducted EMI .....................................................................................................31
14
Revision History ....................................................................................................32
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17-Jul-08
DER-197 – TOP258EN 65 W Adapter
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.
Page 3 of 36
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DER-197 – TOP258EN 65 W Adapter
17-Jul-08
1 Introduction
This engineering report describes a notebook adapter power supply employing the Power
Integrations® TOPSwitch®-HX TOP258EN. This power supply operates over a universal input
range and provides a 19 V, 65 W output. It has been designed and tested to operate in a sealed
enclosure in an external ambient temperature environment of up to 40 °C.
The high voltage (700 V) rating of the MOSFET in the TOPSwitch-HX allows the transformer
primary to secondary turns ratio to be increased in this design (relative to a design using a 600 V
or 650 V MOSFET). This allows using a 60 V, 20 A Schottky output diode instead of a 100 V,
40 A diode; increasing efficiency and lowering cost.
The TOPSwitch-HX, by design, maintains virtually constant efficiency across a very wide load
range without using special operating modes to meet specific load thresholds. This optimizes
performance for existing and emerging energy-efficiency regulations. Maintaining constant
efficiency ensures design optimization for future energy-efficiency regulation changes without the
need for redesign.
The low MOSFET capacitance of TOPSwitch-HX allows a higher switching frequency without the
efficiency penalty which occurs with standard discrete MOSFETs. The 132 kHz switching
frequency (rather than the 70 kHz to 100 kHz frequency used for a discrete MOSFET) reduces
the transformer size required, and so reduces cost.
This power supply offers the following protection features:
• OVP with latching shutdown
• Latching open-loop protection
• Auto-recovery type overload protection
• Auto-restart during brownout or line sag conditions
• Accurate thermal overload protection with auto-recovery, using a large hysteresis
This document provides complete design details including specifications, the schematic, bill of
materials, and transformer design and construction information. This information includes
performance results pertaining to regulation, efficiency, standby, transient load, power-limit data,
and conducted EMI immunity.
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17-Jul-08
DER-197 – TOP258EN 65 W Adapter
Figure 1 – Power Supply Photograph Showing Populated PCB and Shield / Heatspreader.
(9.4 cm x 4 cm x 2.2 cm)
Page 5 of 36
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DER-197 – TOP258EN 65 W Adapter
17-Jul-08
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
Total Output Power
Continuous Output Power
Peak Output Power
Efficiency
Full Load
Required average efficiency at
25%, 50%, 75% and 100 % of
POUT
Symbol
Min
Typ
Max
Units
Comment
VIN
fLINE
90
47
265
64
0.3
VAC
Hz
W
3 Wire – with P.E.
50/60
VOUT1
VRIPPLE1
IOUT1
18.4
19
19.6
100
V
mV
A
± 5%
20 MHz bandwidth
3.42
POUT
POUT_PEAK
65
W
W
ηCEC
87
85
%
%
ηES2.0
87
%
η
o
Measured at POUT 25 C
California Energy Commission
(CEC)
ENERGYSTAR 2008
Environmental
Conducted EMI
Meets CISPR22B / EN55022B
Designed to meet IEC950 /
UL1950 Class II
Safety
1
2
Surge
9.4 x 4 x 2.2
10.1 x 4.7 x 2.9
lxwxh
Dimensions
Ambient Temperature
TAMB
kV
kV
0
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50
cm
o
C
1.2/50 µs surge, IEC 1000-4-5,
Series Impedance:
Differential Mode: 2 Ω
Common Mode: 12 Ω
Populated PCB
Case External
Free convection, sea level
Page 6 of 36
17-Jul-08
DER-197 – TOP258EN 65 W Adapter
3 Schematic
Figure 2 – Schematic.
Page 7 of 36
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DER-197 – TOP258EN 65 W Adapter
17-Jul-08
4 Circuit Description
4.1 General
This power supply employs a TOP258EN off-line switcher, (U1), in a flyback
configuration. IC U1 has an integrated 700 V MOSFET and a multi-mode controller. It
regulates the output by adjusting the MOSFET duty cycle, based on the current fed into
its CONTROL (C) pin.
4.2 Energy Efficiency
The EcoSmart feature of U1 automatically provides constant efficiency over the entire
load range. It uses a proprietary Multi-cycle-modulation (MCM) function to eliminate the
need for special operating modes triggered at specific loads. This simplifies circuit design
since it removes the need to design for aberrant or specific operating conditions or load
thresholds.
4.3 Output Power Limiting with Line Voltage
Resistors R7, R8, and R9 reduce the external current limit of U1 as the line voltage
increases. This allows the supply to limit the output power to <100 VA at high line while
still delivering the rated output at low line, and to provide a constant output power level
with changing line voltages. The combined value of line-sensing resistors R3 and R4
(4 MΏ) sets the under-voltage and overvoltage thresholds for U1. This value also sets the
maximum duty cycle at specific voltages.
4.4 Output Overvoltage Protection
Open-loop faults cause the output voltage to exceed the specified maximum value. To
prevent excessive output voltage levels in such cases, U1 utilizes an output overvoltage
shutdown function. An increase in output voltage causes an increase in the bias winding
on the primary side, sensed by VR1. A sufficient rise in the bias voltage causes VR1 to
conduct and a current to be injected into the Voltage (V) pin of U1. When the current
exceeds 112 µA, U1 enters the overvoltage shutdown mode. This shutdown is hysteretic
and attempts are made to restart the power supply at regular intervals to check if the fault
condition is removed. To change this mode to a latching shutdown, reduce the value of
R12 enough to cause current into the V pin to exceed 336 µA during an open-loop
condition.
4.5 Thermal Overload Protection
IC U1 has an integrated accurate hysteretic thermal overload protection function. When
the junction temperature of U1 reaches +142 °C during a fault condition, the IC shuts
down. It automatically recovers once the junction temperature has decreased by 75 °C.
4.6 AC Input and EMI Filtering
Common-mode inductors L3 and L4 provide filtering on the AC input. X-capacitor C1
provides differential filtering, and resistors R1 and R2 provide safety from shock if the AC
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Page 8 of 36
17-Jul-08
DER-197 – TOP258EN 65 W Adapter
is removed, by ensuring a path for C1 to discharge. Bridge rectifier D1 rectifies the AC
input, and bulk capacitor C2 filters the DC.
Y-capacitor C11, connected between the primary and secondary side provides commonmode filtering.
4.7 TOP258EN and Primary
Capacitor C7 provides the auto-restart timing for U1. At startup this capacitor is charged
through the DRAIN (D) pin. Once it is charged U1 begins to switch. Capacitor C7 stores
enough energy to ensure the power supply starts up. After start-up the bias winding
powers the controller via the CONTROL pin. Bypass capacitor C6 is placed as physically
close as possible to U1. Resistor R13 provides compensation to the feedback loop.
The clamp network formed by VR2, C4, R5, R6, and D2 limits the drain voltage
(preventing spikes at MOSFET turn off) and dissipates transformer leakage inductance
energy. Capacitor C4 does not discharge below the value of VR2 during low frequency
operating modes to improve light load efficiency and reduce no-load input power.
Resistor R6 dampens high-frequency ringing.
4.8 Output Regulation
Schottky diode D5 rectifies the output. A snubber network (C12, R15) dampens ringing
across the diodes and reduces high frequency conducted and radiated noise. Capacitors
C13 and C14 provide output filtering. Resistors R17 and R18 provide a voltage divider
and set the DC setpoint of the output. Capacitor C16 and R19 form the phase
compensation for the feedback control loop. Resistor R16 limits the gain of the feedback
system to ensure power supply stability throughout the range of operation.
Page 9 of 36
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DER-197 – TOP258EN 65 W Adapter
5
17-Jul-08
PCB Layout
Figure 3 – Printed Circuit Layout.
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17-Jul-08
DER-197 – TOP258EN 65 W Adapter
6 Bill of Materials
Item
1
2
Qty
1
1
Ref Des
C1
C2
Description
330 nF, 275 VAC, Film, X2
120 µF, 400 V, Electrolytic, (18 x 30)
Mfg Part Number
LE334-M
EPAG401ELL121MM30S
Mfg
OKAYA
Nippon Chemi-Con
3
4
5
1
2
1
C4
C6 C16
C7
NCD222K1KVY5FF
ECJ-2YB1H104K
ELXZ160ELL470MEB5D
NIC Components Corp
Panasonic
Nippon Chemi-Con
6
7
8
1
1
1
C8
C9
C10
ECJ-3VB1H104K
ECJ-1VB1E104K
EKZE500ELL220ME11D
Panasonic
Panasonic
Nippon Chemi-Con
9
10
11
1
1
2
C11
C12
C13 C14
440LD22-R
ECJ-2VB2A102K
EKZE250ELL471MJ16S
Vishay
Panasonic
Nippon Chemi-Con
12
13
1
1
C15
D1
2.2 nF, 1 kV, Disc Ceramic
100 nF, 50 V, Ceramic, X7R, 0805
47 µF, 16 V, Electrolytic, Low ESR, 500 mΩ, (5
x 11.5)
100 nF, 50 V, Ceramic, X7R, 1206
100 nF 25 V, Ceramic, X7R, 0603
22 µF, 50 V, Electrolytic, Very Low ESR, 340
mΩ, (5 x 11)
2.2 nF, Ceramic, Y1
1 nF, 100 V, Ceramic, X7R, 0805
470 µF, 25 V, Electrolytic, Very Low ESR,
38 mΩ, (10 x 16)
470 pF 50 V, Ceramic, X7R, 0603
800 V, 3 A, Bridge Rectifier, Glass Passivated
ECJ-1VC1H471J
3KBP08M-E4/51
Panasonic
Vishay
14
15
16
17
18
19
20
21
22
1
1
1
1
1
1
1
1
6
800 V, 1 A, Fast Recovery, 250 ns, SMA
100 V, 0.2 A, Fast Switching, 50 ns, SOD-323
100 V, 1 A, Fast Recovery, 150 ns, SMA
60 V, 20 A, Dual Schottky, TO-220AB
4 A, 250 V,Fast, TR5
Heatsink
Heatsink
AC Input Receptacle, 2.5 A 250 V
PCB Terminal Hole, 22 AWG
RS1K-13-F
BAV19WS-7-F
RS1B-13-F
MBR2060CT
3701400041
Custom
Custom
PF-190
N/A
Diodes, Inc
Diode Inc.
Diodes, Inc
Vishay
Wickman
Power Integrations
Power Integrations
Rong Feng
N/A
23
24
25
26
27
2
1
1
1
1
Gen Cable
CLP212SG
Aavid Thermalloy
2
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
ERJ-8GEYJ225V
ERJ-8GEYJ205V
ERJ-8GEYJ101V
CFR-50JB-150R
ERJ-8GEYJ515V
ERJ-8GEYJ685V
ERJ-3EKF1302V
ERJ-6ENF3013V
ERJ-8GEYJ512V
ERJ-8GEYJ6R8V
ERJ-3GEYJ200V
ERJ-8GEYJ330V
ERJ-8ENF1001V
ERJ-6ENF6812V
ERJ-6ENF1002V
ERJ-8GEYJ102V
PMSSS 440 0031 PH
YW-490-00B
TOP258EN
LM431AIM
48
1
U3
Wire Jumper, Insulated, 22 AWG, 0.3 in
12 mH,xA, Ferite Toroid, 4 Pin, Output
200 µH,xA, Ferite Toroid, 4 Pin, Output
Nut, Hex, Kep 4-40, S ZN Cr3 plating RoHS
Heatsink Hardware, Edge Clip 21N (4.7 lbs) 10
mm L x 7 mm W x 0.5 mm H
2.2 MΩ, 5%, 1/4 W, Metal Film, 1206
2 MΩ, 5%, 1/4 W, Metal Film, 1206
100 Ω, 5%, 1/4 W, Metal Film, 1206
150 Ω, 5%, 1/2 W, Carbon Film
5.1 MΩ, 5%, 1/4 W, Metal Film, 1206
6.8 MΩ, 5%, 1/4 W, Metal Film, 1206
13 kΩ, 1%, 1/16 W, Metal Film, 0603
301 Ω, 1%, 1/8 W, Metal Film, 0805
5.1 kΩ 5%, 1/4 W, Metal Film, 1206
6.8 Ω, 5%, 1/4 W, Metal Film, 1206
20 Ω, 5%, 1/10 W, Metal Film, 0603
33 Ω, 5%, 1/4 W, Metal Film, 1206
1.0 kΩ, 1%, 1/4 W, Metal Film, 1206
68.1 kΩ, 1%, 1/8 W, Metal Film, 0805
10 kΩ, 1%, 1/8 W, Metal Film, 0805
1 kΩ, 5%, 1/4 W, Metal Film, 1206
SCREW MACHINE PHIL 4-40X5/16 SS
Bobbin, EE28. Vertical, Extd creepage, 10 pins
TOPSwitch-HX, TNY258EN, eSIP-7C
2.495 V Shunt Regulator IC, 2%, -40 to 85C,
SOT23
Optocoupler, 80 V, CTR 80-160%, 4-Mini Flat
C2004-12-02
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
D2
D3
D4
D5
F1
HS1
HS2
J1
J2 J3 J6 J7
J8 J9
JP1 JP5
L3
L4
NUT1
POWR
CLIP1
R1 R2
R3 R4 R11
R5
R6
R7
R8
R9
R10
R12
R13
R14
R15
R16
R17
R18
R19
SCREW1
T1
U1
U2
PC357N3TJ00F
Panasonic
Panasonic
Panasonic
Yageo
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Building Fasteners
Yih-Hwa Enterprises
Power Integrations
National
Semiconductor
Sharp
49
50
1
1
VR1
VR2
18 V, 5%, 500 mW, DO-35
250 V, 600 W Pk, 5%, TVS, DO204AC (DO-15)
1N5248B-T
P6KE250ARL
Diode Inc.
ST
Page 11 of 36
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DER-197 – TOP258EN 65 W Adapter
17-Jul-08
7 Transformer Specification
7.1
Electrical Diagram
WD3, WD5: Copper Shield
1
WD6: Second Half Primary
2
FL1
WD4: 19 V Output
FL2
WD2: First Half Primary
3
4
WD1: Bias
5
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 Primary to Secondary
Pins 1-3, all other windings open, measured at
100 kHz, 0.4 VRMS
Pins 1-3, all other windings open
Pins 1-3, with Pins 4-5 and secondary shorted,
measured at 100 kHz, 0.4 VRMS
3000 VAC
452 µH, ±5%
1 MHz (Min.)
5 µH (Max.)
Materials
Item
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
Description
2
Core: EE28 PC44 gapped to ALG of 478 nH/T
Bobbin: EE28. Vertical, extended creepage, 10 pins
Magnet Wire: #32 AWG, double coated
Magnet Wire: #25 AWG, double coated
Triple Insulated Wire: #24 AWG, Triple Insulated Wire
Tape, 3M Polyester Film, 2.0 mils thick, 9.6 mm wide
Copper Foil Tape 2 mils
Tape, 3M Polyester Film, 2.0 mils thick, 13 mm wide
Varnish
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17-Jul-08
7.4
DER-197 – TOP258EN 65 W Adapter
Transformer Build Diagram
1
WD6: 15Tx2 - #25 AWG
2
1
FL2
FL1
1
2
3
5
4
WD5: 1T Copper Foil
WD4: 3Tx4 - #24 TIW
WD3: 1T Copper Foil (reverse wind)
WD2: 16Tx2 - #25 AWG
WD1: 2Tx4 - #32 AWG
Figure 5 – Transformer Build Diagram.
FL – Flying leads. Mark the start of the secondary winding to denote electrical polarity.
Wire
Tape
Copper
Figure 6 – WD3 and WD5 Copper Foil Preparation. Build using Items [3], [7], and [8].
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DER-197 – TOP258EN 65 W Adapter
7.5
17-Jul-08
Transformer Construction
Bobbin Preparation
Quadfilar Bias
Winding
Basic Insulation
Primary
Basic Insulation
Copper Shield
Basic Insulation
Quadfilar
Secondary Winding
Basic Insulation
Copper Shield
Basic Insulation
Primary
Final Assembly
Primary side of the bobbin (item [2]) orients such that the pins are on the
right hand side. Winding direction is clockwise.
Starting at Pin 4, wind 2 quadfilar turns of item [3]. Spread turns evenly
across bobbin. Finish at Pin 5.
Use one layer of item [6].
Start at Pin 3. Wind 16 bifilar turns of item [4] in 2 layers. Finish on Pin 2.
Use one layer of item [6].
Use the prepared copper shield. Start on pin 1. Wind 1 turn in
anticlockwise direction. Place tape of item [6] first to avoid shortage. Do
not terminate this winding.
Use one layer of item [6] for basic insulation.
Wind 3 quadrifilar turns of item [5] (about 2 layers). Spread turns evenly
across bobbin. Finish on temporary pins on secondary side. After one
layer of tape to secure the winding in place, cut out the connection to the
temporary pins for start and finish this winding. Leave secondary winding
leads as flying. Mark the starting end of the winding for identification.
Use one layer of item [6] for basic insulation.
Use the prepared copper shield. Wind 1 turn in clockwise direction. Place
tape of item [6] first to avoid shortage. Finish on Pin 1.
Use one layer of item [6].
Start at Pin 2. Wind 15 bifilar turns of item [4] in 2 layers. Finish on Pin 1.
Assemble and secure core halves so that the tape wrapped E core is at
the bottom of the transformer. Varnish impregnate in item [9].
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17-Jul-08
DER-197 – TOP258EN 65 W Adapter
8 Transformer Spreadsheet
ACDC_TOPSwitchHX_02130
8; Rev.1.8; Copyright Power
Integrations 2008
INPUT
INFO
ENTER APPLICATION VARIABLES
VACMIN
90
VACMAX
265
fL
50
VO
19.00
PO_AVG
65.00
PO_PEAK
n
0.83
Z
0.50
VB
15
tC
3.00
CIN
OUTPUT
65.00
120.0
120
OUTPUT
65.00
KI
TOP258EN
Power
Out
Volts
Volts
Hertz
Volts
Watts
Watts
%/100
120
Volts
mSecon
ds
uFarads
Power
Out
Univers
al /
Peak
148 W /
148 W
ENTER TOPSWITCH-HX VARIABLES
TOPSwitch-HX
TOP258
EN
Chosen Device
UNIT
0.48
ILIMITMIN_EXT
1.920
1.920
Amps
ILIMITMAX_EXT
2.208
2.208
Amps
F
F
fS
132000
132000
Hertz
fSmin
119000
119000
Hertz
fSmax
145000
145000
Hertz
FF
FF
10
10
Frequency (F)=132kHz,
(H)=66kHz
High Line Operating Mode
VOR
VDS
F
200.00
Volts
Volts
VD
0.50
Volts
VDB
0.70
Volts
KP
0.60
PROTECTION FEATURES
LINE SENSING
VUV_STARTUP
101
101
Volts
VOV_SHUTDOWN
490
490
Volts
RLS
4.4
4.4
M-ohms
TOP_HX_021308: TOPSwitch-HX
Continuous/Discontinuous
Flyback Transformer Design
Spreadsheet
Customer
Minimum AC Input Voltage
Maximum AC Input Voltage
AC Mains Frequency
Output Voltage (main)
Average Output Power
Peak Output Power
Efficiency Estimate
Loss Allocation Factor
Bias Voltage
Bridge Rectifier Conduction Time
Estimate
Input Filter Capacitor
115 Doubled/230V
195W
External Ilimit reduction factor
(KI=1.0 for default ILIMIT, KI <1.0
for lower ILIMIT)
Use 1% resistor in setting external
ILIMIT
Use 1% resistor in setting external
ILIMIT
Select 'H' for Half frequency 66kHz, or 'F' for Full frequency 132kHz
TOPSwitch-HX Switching
Frequency: Choose between 132
kHz and 66 kHz
TOPSwitch-HX Minimum
Switching Frequency
TOPSwitch-HX Maximum
Switching Frequency
Full Frequency, Jitter enabled
Reflected Output Voltage
TOPSwitch on-state Drain to
Source Voltage
Output Winding Diode Forward
Voltage Drop
Bias Winding Diode Forward
Voltage Drop
Ripple to Peak Current Ratio (0.3
< KRP < 1.0 : 1.0< KDP<6.0)
Minimum DC Bus Voltage at which
the power supply will start-up
Typical DC Bus Voltage at which
power supply will shut-down (Max)
Use two standard, 2.2 M-Ohm, 5%
resistors in series for line sense
functionality.
OUTPUT OVERVOLTAGE
Page 15 of 36
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DER-197 – TOP258EN 65 W Adapter
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VZ
27
27
Volts
RZ
5.1
5.1
k-ohms
Overload Current Ratio at
VMAX
1.2
1.2
Overload Current Ratio at
VMIN
ILIMIT_EXT_VMIN
ILIMIT_EXT_VMAX
RIL
1.04
1.04
1.82
1.75
12.72
1.82
1.75
12.72
A
A
k-ohms
N/A
N/A
M-ohms
Zener Diode rated voltage for
Output Overvoltage shutdown
protection
Output OVP resistor. For latching
shutdown use 20 ohm resistor
instead
OVERLOAD POWER
LIMITING
RPL
ENTER TRANSFORMER CORE/CONSTRUCTION VARIABLES
Core Type
EI28
EI28
Core
EI28
Bobbin
EI28_BOBBIN
AE
0.86
Enter the desired margin to current
limit at VMAX. A value of 1.2
indicates that the current limit
should be 20% higher than peak
primary current at VMAX
Margin to current limit at low line.
EI28
0.86
P/N:
P/N:
cm^2
4.82
4300
4.82
4300
cm
nH/T^2
9.6
9.6
mm
mm
3
3
DC INPUT VOLTAGE PARAMETERS
VMIN
VMAX
84
375
84
375
CURRENT WAVEFORM SHAPE PARAMETERS
DMAX
0.73
0.73
IAVG
0.93
0.93
Amps
1.82
1.82
Amps
IR
1.09
1.09
Amps
IRMS
1.12
1.12
Amps
TRANSFORMER PRIMARY DESIGN PARAMETERS
LP
452
452
uHenrie
s
LP Tolerance
NP
NB
ALG
BM
5
31
2
478
3119
5
31
2
478
3119
LE
AL
BW
M
0.00
L
NS
2.00
3
IP
Warning
5
Warning
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Volts
Volts
nH/T^2
Gauss
Peak primary Current at VMIN
Peak Primary Current at VMAX
Current limit/Power Limiting
resistor.
Resistor not required. Use RIL
resistor only
Core Type
PC40EI28-Z
BE-28-1110CPL
Core Effective Cross Sectional
Area
Core Effective Path Length
Ungapped Core Effective
Inductance
Bobbin Physical Winding Width
Safety Margin Width (Half the
Primary to Secondary Creepage
Distance)
Number of Primary Layers
Number of Secondary Turns
Minimum DC Input Voltage
Maximum DC Input Voltage
Maximum Duty Cycle (calculated
at PO_PEAK)
Average Primary Current
(calculated at average output
power)
Peak Primary Current (calculated
at Peak output power)
Primary Ripple Current
(calculated at average output
power)
Primary RMS Current (calculated
at average output power)
Primary Inductance
Tolerance of Primary Inductance
Primary Winding Number of Turns
Bias Winding Number of Turns
Gapped Core Effective Inductance
Operating flux density should be
below 3000 Gauss, Increase turns
Page 16 of 36
17-Jul-08
DER-197 – TOP258EN 65 W Adapter
OR increase core size
BP
3965
3965
Gauss
BAC
936
936
Gauss
ur
1918
1918
LG
BWE
OD
0.20
19.2
0.62
0.20
19.2
0.62
mm
mm
mm
INS
0.07
0.07
mm
DIA
AWG
0.55
24
0.55
24
mm
AWG
CM
406
406
Cmils
CMA
362
362
Primary Current Density (J)
5.49
5.49
Cmils/A
mp
Amps/m
m^2
TRANSFORMER SECONDARY DESIGN PARAMETERS (SINGLE OUTPUT EQUIVALENT)
Lumped parameters
ISP
18.71
18.71
Amps
ISRMS
7.01
7.01
Amps
IO_PEAK
3.42
3.42
Amps
IO
3.42
3.42
Amps
IRIPPLE
6.12
6.12
Amps
CMS
1402
1402
Cmils
18
18
AWG
DIAS
1.03
1.03
mm
ODS
3.20
3.20
mm
INSS
1.09
1.09
mm
755
755
Volts
PIVS
56
56
Volts
PIVB
44
44
Volts
AWGS
VOLTAGE STRESS PARAMETERS
VDRAIN
Warning
Peak Flux Density (BP<4200) at
ILIMITMAX and LP_MAX. Note:
Recommended values for
adapters and external power
supplies <=3600 Gauss
AC Flux Density for Core Loss
Curves (0.5 X Peak to Peak)
Relative Permeability of Ungapped
Core
Gap Length (Lg > 0.1 mm)
Effective Bobbin Width
Maximum Primary Wire Diameter
including insulation
Estimated Total Insulation
Thickness (= 2 * film thickness)
Bare conductor diameter
Primary Wire Gauge (Rounded to
next smaller standard AWG value)
Bare conductor effective area in
circular mils
Primary Winding Current Capacity
(200 < CMA < 500)
Primary Winding Current density
(3.8 < J < 9.75)
Peak Secondary Current
Secondary RMS Current
Secondary Peak Output Current
Average Power Supply Output
Current
Output Capacitor RMS Ripple
Current
Secondary Bare Conductor
minimum circular mils
Secondary Wire Gauge (Rounded
up to next larger standard AWG
value)
Secondary Minimum Bare
Conductor Diameter
Secondary Maximum Outside
Diameter for Triple Insulated Wire
Maximum Secondary Insulation
Wall Thickness
!!! REDUCE DRAIN VOLTAGE
Vdrain<680, reduce VACMAX,
reduce VOR
Output Rectifier Maximum Peak
Inverse Voltage
Bias Rectifier Maximum Peak
Inverse Voltage
Note – The very high reflected output voltage (VOR) levels in this design require special considerations,
and so the following warnings can be ignored:
• Peak Primary current (IP) – The margin between the peak primary current during normal operation and
the worst case minimum current limit is less than recommended. Check both the transient response
and control-loop bandwidth to ensure this performance is satisfactory.
• Maximum flux density (BM) - Ideally this flux density should be kept below 3000 Gauss. We can ignore
this warning since the AC flux is below 1000 and BP is below 4200 Gauss.
Page 17 of 36
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DER-197 – TOP258EN 65 W Adapter
•
17-Jul-08
Max Drain Voltage (VDRAIN) – VDRAIN must not exceed the rated voltage of the MOSFET (700 V).
The spreadsheet assumes a clamping voltage of 1.8 times VOR (360 V). This design has a lowered
clamping voltage of 240 V, which ensures VDRAIN stays within specified limits. See maximum drain
voltage waveforms.
9 Performance Data
All measurements were performed at room temperature.
9.1 Efficiency
The following efficiency data was taken at room temperature, using a 60 Hz AC input.
The output voltage was measured at the end of a cable connected to the output. The
cable has a DC resistance of approximately 0.1 Ώ. The unit was operated at full load for
15 minutes prior to taking the measurements.
90%
88%
Efficiency (%)
85%
83%
80%
78%
75%
73%
70%
90
125
160
195
230
265
Input Voltage (VAC)
Figure 7 – Efficiency vs. Input Voltage, Room Temperature, 60 Hz.
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17-Jul-08
DER-197 – TOP258EN 65 W Adapter
9.1.1 Active Mode CEC Measurement Data
All single output adapters, including those provided with products, for sale in California
after Jan 1st, 2007, must meet the California Energy Commission (CEC) requirement for
minimum active-mode efficiency, and no-load input power. The minimum active mode
efficiency is defined as the average efficiency measured at 25%, 50%, 75% and 100% of
rated output power, with the limit based on the nameplate output power:
Nameplate Output (PO)
Minimum Efficiency in Active Mode of Operation
<1W
≥ 1 W to ≤ 51 W
> 51 W
0.5 × PO
0.09 × ln (PO) + 0.5 [ln = natural log]
0.85
For adapters that use a single input voltage only the measurement is made at the rated
single nominal input voltage (115 VAC or 230 VAC). For universal input adapters the
measurement is made at both nominal input voltages (115 VAC and 230 VAC).
To meet the standard, the measured average efficiency (or efficiencies for universal input
supplies) must be greater than or equal to the efficiency specified by the CEC/Energy
Star standard. The data below shows the results for this power supply design.
Percent of
Full Load
25
50
75
100
Average
ENERGY
STAR 2.0
CEC 2008
specified
minimum
average
efficiency (%)
Efficiency (%)
115 VAC
230 VAC
88.03
87.67
87.42
86.47
87.4
87.11
87.44
87.37
87.74
87.42
87
85
For the latest up to date information please visit the PI Green Room:
http://www.powerint.com/greenroom/regulations.htm
Page 19 of 36
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DER-197 – TOP258EN 65 W Adapter
17-Jul-08
9.2 Output Diode Efficiency Comparison
The following table shows how using different output diodes with different ratings affects
efficiency in this design. All three diodes used the same power supply unit and use the
same TOP258EN device.
% of Full
Load
25
50
75
100
Average
Energy Star
2.0
Requirement
CEC 2008
Requirement
*
Margin
(ES 2.0)
MBR2060CT
60 V, 20 A
Schottky Diode
MBR41H100CT1
100 V, 40 A
Schottky Diode
B30H60G
60 V, 30 A
Schottky Diode
Efficiency (%)
Efficiency (%)
Efficiency (%)
115
VAC
88.03
87.67
87.42
86.47
87.4
230
VAC
87.11
87.44
87.37
87.74
87.42
115
VAC
87.62
87.26
86.81
86.17
86.96
230
VAC
86.25
87.21
88.04
87.20
87.18
115
VAC
87.94
88.47
88.11
87
87.88
230
VAC
87.94
87.54
89.06
89.65
88.05
87
87
87
87
87
87
85
85
85
85
85
85
0.89
0.9
0.46
0.68
1.38
1.55
*
The test method specified for measuring efficiency for Energy Star 2.0 (ES 2.0 in the
preceding table) rounds data to nearest percent. Using this method a measured
efficiency of 86.5% would be rounded up to 87% and meets the Energy Star 2.0 87%
requirement.
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Page 20 of 36
17-Jul-08
DER-197 – TOP258EN 65 W Adapter
9.3 No-load Input Power
The unit was operated for 15 minutes prior to measurements being taken.
200
Input Power (mW)
160
120
80
40
0
90
125
160
195
230
265
Input Voltage (VAC)
Figure 8 – Zero Load Input Power vs. Input Line Voltage, Room Temperature, 60 Hz.
Page 21 of 36
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DER-197 – TOP258EN 65 W Adapter
17-Jul-08
9.4 Available Standby Output Power
The chart below shows the available output power for a given level of line voltage with
input power levels of 1 W, 2 W, and 3 W.
The voltage measurements were taken at the end of an output cable, which had a DC
resistance of approximately 0.1 Ώ. The unit was allowed to warm up prior to taking data.
3
Output Power (W)
2.5
2
1.5
1
0.5
Standby for 1 W Input
Standby for 2 W Input
Standby for 3 W Input
0
90
125
160
195
230
265
Input Voltage (VAC)
Figure 9 – Standby Power Availability vs. Input Voltage.
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DER-197 – TOP258EN 65 W Adapter
9.5 Regulation
The following data was taken at room temperature, using a 60 Hz AC input. The voltage
measurements were taken at the end of an output cable with a DC resistance of
approximately 0.1 Ώ.
9.5.1 Load
20
Output Voltage (VDC)
18
16
115 VAC
230 VAC
14
12
10
0
0.5
1
1.5
2
2.5
3
3.5
Output Current (A)
Figure 10 – Load Regulation, Room Temperature.
9.5.2 Line
Output Voltage (VDC)
20
15
10
5
0
90
125
160
195
230
265
Input Voltage (VAC)
Figure 11 – Line Regulation, Room Temperature, Full Load.
Page 23 of 36
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DER-197 – TOP258EN 65 W Adapter
17-Jul-08
Thermal Performance
The power supply was placed inside a sealed plastic case to restrict airflow. The
chamber temperature was controlled to maintain a constant temperature inside the box.
The supply was operated at its rated output power (65 W). To measure the device (U1)
temperature, a T-type thermocouple was attached on the heatsink, very close to the tab.
The output diode (D5) temperature was measured by attaching a T-type thermocouple to
its tab. The transformer (T1) core temperature was measured by attaching a T-type
thermocouple firmly to the outer side of the windings.
Temperature (°°C)
Item
90 VAC
115 VAC
230 VAC
40
25
25
Transformer (T1)
121 (110*)
102
72
TOPSwitch (U1)
109
81
104
Rectifier (D5)
120
99
99
Bridge (D1)
94
84
-
Ambient
*With heat spreading glue applied.
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DER-197 – TOP258EN 65 W Adapter
10 Waveforms
10.1 Drain Voltage and Current, Normal Operation
Figure 12 – 90 VAC, Full Load.
Upper: VDRAIN, 200 V, 2 µs / div.
Lower: : IDRAIN, 1.0 A / div.
Figure 13 – 265 VAC, Full Load.
Upper: VDRAIN, 200 V, 2 µs / div.
Lower: : IDRAIN, 1.0 A / div.
10.2 Output Voltage Start-up Profile
Figure 14 – Start-up Profile, 115 VAC, 3.42 A load.
Page 25 of 36
Figure 15 – Start-up Profile, 230 VAC, 3.42 A load.
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10.3 Drain Voltage and Current Start-up Profile
Figure 16 – 90 VAC Input and Maximum Load.
Upper: VDRAIN, 100 V & 20 ms / div.
Lower: IDRAIN, 1.0 A / div.
Figure 17 – 265 VAC Input and Maximum Load.
Upper: VDRAIN, 200 V & 20 ms / div.
Lower: IDRAIN, 1.0 A / div.
10.4 Load Transient Response (50% to 100% Load Step)
In the figures shown below, the oscilloscope’s signal averaging function was used to
better enable viewing the load transient response. The load’s current step was used to
trigger the oscilloscope to capture the waveform. 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 average out, leaving only the load step response.
Figure 18 – Transient Response, 115 VAC, 50100% Load Step.
Top: Output Voltage.
Bottom: Load Current, 1 A/div.
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Figure 19 – Transient Response, 230 VAC, 50-100%
Load Step.
Upper: Output Voltage.
Bottom Load Current, 1 A/div.
Page 26 of 36
17-Jul-08
DER-197 – TOP258EN 65 W Adapter
10.5 Output Ripple Measurements
10.5.1 Ripple Measurement Technique
For DC output ripple measurements, use a modified oscilloscope test probe to reduce
spurious signals. Details of the probe modification are provided in figures below.
Tie two capacitors in parallel across the probe tip of the 4987BA probe adapter. Use a
0.1 µF/50 V ceramic capacitor and a 1.0 µF/50 V aluminum-electrolytic capacitor. The
aluminum-electrolytic capacitor is polarized, so always maintain proper polarity across
DC outputs.
Probe Ground
Probe Tip
Figure 20 – Oscilloscope Probe Prepared for Ripple Measurement. (End Cap and Ground Lead Removed)
Figure 21 – Oscilloscope Probe with Probe Master (www.probemaster.com) 4987A BNC Adapter.
(Modified with wires for ripple measurement, and two parallel decoupling capacitors added)
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DER-197 – TOP258EN 65 W Adapter
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10.5.2 Measurement Results
Figure 22 – Ripple, 115 VAC, Full Load.
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Figure 23 – 5 V Ripple, 230 VAC, Full Load.
Page 28 of 36
17-Jul-08
DER-197 – TOP258EN 65 W Adapter
11 Control Loop Measurements
The following control-loop measurements were taken at room temperature using a 60 Hz
AC input and a 3.42 A load.
11.1 115 VAC Maximum Load
At 115 VAC the loop crossover frequency was measured as 2 kHz. The phase and gain
margins were 45º and 9 dB, respectively.
Figure 24 – Gain-Phase Plot, 115 VAC, Maximum Steady-state Load.
Vertical Scale: Gain = 10 dB/div, Phase = 30 °/div.
Crossover Frequency = 2.0 kHz Phase Margin = 45°.
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DER-197 – TOP258EN 65 W Adapter
17-Jul-08
11.2 230 VAC Maximum Load
At 230 VAC the loop crossover frequency was measured as 500 Hz. The phase and gain
margins were 60º and 30 dB, respectively.
Figure 25 – Gain-Phase Plot, 230 VAC, Maximum Steady-state Load.
Vertical Scale: Gain = 10 dB/div, Phase = 30 °/div.
Crossover Frequency = 500 Hz, Phase Margin = 60°.
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17-Jul-08
DER-197 – TOP258EN 65 W Adapter
12 Conducted EMI
Figure 26 – Conducted EMI, Maximum Steady-state Load, 115 VAC, 60 Hz, EN55022 B Limits.
Output was Grounded
Figure 27 – Conducted EMI, Maximum Steady-state Load, 230 VAC, 60 Hz, EN55022 B Limits.
Output was Grounded
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DER-197 – TOP258EN 65 W Adapter
17-Jul-08
13 Revision History
Date
17-Jul-08
Author
JD
Revision
1.0
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Description & changes
Initial Release
Reviewed
Page 32 of 36
17-Jul-08
DER-197 – TOP258EN 65 W Adapter
Notes
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DER-197 – TOP258EN 65 W Adapter
17-Jul-08
Notes
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Page 34 of 36
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DER-197 – TOP258EN 65 W Adapter
Notes
Page 35 of 36
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DER-197 – TOP258EN 65 W Adapter
17-Jul-08
For the latest updates, visit our website: www.powerint.com
Power Integrations reserves the right to make changes to its products at any time to improve reliability or
manufacturability. Power Integrations does not assume any liability arising from the use of any device or circuit
described herein. POWER INTEGRATIONS MAKES NO WARRANTY 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 transformer construction and circuits external to the products)
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 grants its customers a license under certain patent rights as set forth at
http://www.powerint.com/ip.htm.
The PI Logo, TOPSwitch, TinySwitch, LinkSwitch, DPA-Switch, PeakSwitch, EcoSmart, Clampless, E-Shield, Filterfuse, StackFET,
PI Expert and PI FACTS are trademarks of Power Integrations, Inc. Other trademarks are property of their respective
companies. ©Copyright 2008 Power Integrations, Inc.
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