EPR-12_技术文档

Engineering Prototype Report for EP-12 -

145 W PC Forward Converter with TOP247 and

10 W 5 V Output Standby Flyback with TNY266

Title

Specification

Application

Author

PC Main and PC Standby

PI Applications

Document

Number

EPR-12

01-Feb-05

1.3

Date

Revision

Objective

This document describes the operation and provides the performance data of a design

using TOP247 as a forward converter for 145 W PC supply application and TNY266 as a

10 W flyback for PC standby.

Power Integrations

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EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

Table of Contents

Table of Contents............................................................................................................... 2

1

2

Introduction ................................................................................................................. 3

Supply Requirements.................................................................................................. 5

2.1 Power Supply Specification..................................................................................... 5

2.2 Conditions for Cross Regulation Test...................................................................... 6

2.3 Output Characteristics............................................................................................. 6

2.4 Transient Overshoot................................................................................................ 6

2.5 Short Circuit Protection............................................................................................ 6

Schematics ................................................................................................................. 7

Circuit Description..................................................................................................... 10

PCB Layout............................................................................................................... 12

Bill Of Materials......................................................................................................... 14

6.1 Electrical Bill of Materials....................................................................................... 14

6.2 Hardware Bill of Materials...................................................................................... 16

6.3 Output Cable Bill of Materials................................................................................ 16

6.4 Heatsinks Bill of Materials ..................................................................................... 17

Transformer Specification......................................................................................... 18

7.1 145 W Forward Transformer ................................................................................. 18

7.1.1 Electrical Specifications.................................................................................. 18

7.1.2 Materials......................................................................................................... 18

7.1.3 Transformer Build Diagram ............................................................................ 19

7.1.4 Transformer Construction............................................................................... 19

7.2 10 W PC Standby Transformer ............................................................................. 21

7.2.1 Electrical Specifications.................................................................................. 21

7.2.2 Materials......................................................................................................... 21

7.2.3 Transformer Build Diagram ............................................................................ 22

7.2.4 Transformer Construction............................................................................... 22

7.3 Output Coupled Inductor ....................................................................................... 23

7.3.1 The Toroid Layout.......................................................................................... 23

7.3.2 Inductances.................................................................................................... 23

7.4 The Mag Amp Inductor.......................................................................................... 24

7.4.1 Core Specification .......................................................................................... 24

7.4.2 Winding Instruction......................................................................................... 24

PIXls Design Spreadsheet ........................................................................................ 25

Test Results.............................................................................................................. 30

3

4

5

6

7

8

9

10 Performance Data..................................................................................................... 31

10.1 Efficiency and Regulation .................................................................................. 31

10.2 Power Limit vs. Input Line.................................................................................. 32

11 Waveforms................................................................................................................ 33

11.1 Drain Switching Waveforms............................................................................... 34

11.2 Output Ripple Measurements ............................................................................ 36

12 Conducted EMI ......................................................................................................... 37

13 Revision History ........................................................................................................ 38

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Page 2 of 40

01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

Important Note:

Although the EP-12 is designed to satisfy safety isolation requirements, this

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.

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Page 3 of 40

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EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

1

Introduction

The following engineering report gives the detailed description and test data for a

TOP247 forward converter designed for 145 W PC main applications and a TNY266

flyback for PC standby. The requirements listed below are typical of a PC power supply.

Figure 1 - EP-12 Populated Circuit Board.

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Page 4 of 40

01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

2

Supply Requirements

2.1 Power Supply Specification

Description

Symbol

Min

Typ

Max

Units

Comment

Input

Doubler Input

Voltage

Frequency

Standby Input Power (115 VAC)

Blue Angel Input Power (240 VAC)

V_IN

f_LINE

90

47

115

50/60

0.91

4.2

132

63

1

VAC

Hz

W

0.5 W Output From Standby

2.5 W output From Standby

5

W

Output

4%

Output Voltage 1

Output Ripple Voltage 1

Output Current 1

Output Voltage 2

Output Ripple Voltage 2

Output Current 2

V_OUT1

V_RIPPLE1

I_OUT1

V_OUT2

V_RIPPLE2

I_OUT2

3.17

3.30

5.00

3.43

50

12

5.25

50

15

V

mV

A

V

mV

A

20 MHz Bandwidth

0.5

4.75

5%

20 MHz Bandwidth

0.4

7%

Output Voltage 3

Output Ripple Voltage 3

Output Current 3

Output Voltage 4 (standby)

Output Ripple Voltage 4

Output Current 4

V_OUT3

V_RIPPLE3

I_OUT3

V_OUT4

V_RIPPLE4

I_OUT4

11.16 12.0 12.84

120

V

mV

A

V

mV

A

20 MHz Bandwidth

5 A, 15 s Surge

5%

0.05

4.75

3

5.25

50

5.00

20 MHz Bandwidth

2.5 A, 15 s Surge

0

2.0

Total Output Power

Continuous Output Power (main)

Continuous Output Power (s/b)

P_{O_main}

P_{O_s/b}

150

10

175

12.5

W

Efficiency

Measured at P_{O_main}=150 W

Meets CISPR22B / EN55022B

Main Converter

65

71

%

η_main

Environmental

Conducted EMI

Designed to Meet IEC950,

UL1950 Class II

Safety

1.2/50 µs Surge, IEC 1000-4-5,

12 Ω Series Impedance,

Differential and Common Mode

Surge

4

kV

100 kHz Ring Wave, 500 A Short

Circuit Current, Differential and

Common Mode

Surge

4

0

kV

^oC

Free Convection, Sea Level

Ambient Temperature

T_AMB

50

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EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

2.2 Conditions for Cross Regulation Test

Load

+5 V

11 A

15 A

2 A

0.4 A

5 A

15 A

12 A

0 A

+3.3 V

12 A

7 A

2 A

0.5 A

3 A

7 A

12 A

0 A

+12 V

3 A

0.05 A

1 A

3 A

5 A (15 s)

0 A

1

2

3

4

5

6

7

8

2.3 Output Characteristics

a. Rise time: all outputs of the power supply must rise from 10% to 90% of their rated

output voltages within 2 ms to 20 ms at nominal line, maximum load.

b. Turn-on delay time: 1000 ms maximum at nominal line, full load.

c. Hold-up time: 16 ms minimum for all outputs at 110 VAC, 60 Hz, and full load.

2.4 Transient Overshoot

a. +5 V, +12 V and +3.3 V dynamic load transient response. Transient response is

measured by switching the output load from 80% to 100% to 80% of its maximum

load, other outputs are under maximum load with an input voltage from 90 VRMS to

132 VRMS and at a frequency of 100 Hz and 50% duty cycle, step load change is

0.5 A/µs. The peak transient amplitude is less than or equal to +5% / -5% of +5 V,

+12 V, +3.3 V output. The recovery time is less than 5 ms.

b. Overshoot: +5 V: 5.5 V maximum

+3.3 V: 3.63 V maximum

2.5 Short Circuit Protection

The main supply shall latch off from a shorted output condition. The latch is reset through

toggling remote ON/OFF.

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01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

3

Schematics

Figure 2 – EP-12 Main Forward Converter Primary Side.

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EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

Figure 3 - EP-12 Main Forward Converter Secondary Side.

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Page 8 of 40

01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

Figure 4 – EP-12 Standby Flyback Converter.

Figure 5 – EP-12 Remote ON / OFF Interface.

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Page 9 of 40

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

4 Circuit Description

With line feed forward, duty factor reduction, programmable primary current limit, line-

sense for input UV and OV, and soft-start function for smooth start-up, the

TOPSwitch−GX family has all the needed functions to operate in an off-line, single-

ended forward converter configuration. Also the TOPSwitch−GX family has a sufficient

power capability to bring PC main applications easily within its reach.

In the present design the LINE-SENSE pin (L pin, please refer to TOPSwitch−GX data

sheet) senses the rectified DC input voltage through the combination of R3, R5, and R6

and inhibits the supply from switching until the minimum voltage of 80 VAC (doubled

mains) or 160 VAC is reached. Upon reaching this voltage and activation of switching,

current sourced from R8 will immediately establish a maximum duty factor limit by

injecting the appropriate amount of current into the LINE-SENSE pin (adjusting maximum

duty factor, please refer to TOPSwitch−GX data sheet). The input from R8 is a quasi-

integrated, DC-rectified forward voltage sourced from the bias winding and will restrict

the duty factor to a greater degree as the line voltage is increased. This is a very

significant function to ensure that the transformer will not saturate, even in extreme

transient load conditions.

A TOP247 was selected for this 145 W application and its primary current limit was

adjusted to limit at approximately 2.5 A by R12 when U3 is on. This allows approximately

170 W of peak output power.

Lowering the input voltage will cause the converter to shut off by means of the under-

voltage lockout circuit around Q1. When input voltage is low enough to bias on Q1, the

collector of Q1 will pull up the X pin of the TOP247 via R39 and shut off the main

converter.

This design uses a Zener primary clamp (D3, D4, D5) with a capacitor (C4) in parallel

that is coupled to the drain of the TOPSwitch−GX through a diode (D1). This is a very

efficient snubber as it allows the maximum flyback voltage to develop during the off time

which returns a significant amount of energy back to the transformer during the reverse

time recovery of the diode D1. The total dissipation of the primary snubber clamp circuit

was measured to be only 0.8 W at maximum load.

It is necessary to use voltage mode control in the regulation loop when using

TOPSwitch−GX. As the data will show, the transient response is very good and there

appears to be no difficulty in compensating the voltage mode control loop for optimal

performance.

The remote ON/OFF function is implemented by using a very simple circuit around Q3.

When the ON line (green wire in output cable) is grounded to secondary return, Q3 is

turned on and drives the LED of U3 on, which will ground R12 on the primary side and

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Page 10 of 40

01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

enable the TOP247 via its X pin. If the output comes up into regulation before C19

completely discharges, Q3 is sustained on through R28 and the converter remains

running. Upon loss of regulation, Q3 will turn off and the converter will shut off. Toggling

the ON/OFF input will allow the converter to retry operation.

When the ON line is open, it is internally pulled up to the +5 V standby and the main

converter remains in the inhibit state. The +5 V standby is always operating provided

there is sufficient AC input to the supply. By connecting the ON line to output return, the

main supply will turn on, provided there is sufficient input voltage and there is no fault

condition. If there is a fault then the supply will latch off. A retry is accomplished by

simply toggling the ON line.

Note: If the remote ON line is connected to output return (main power enabled) while

turning on AC into the supply, the main converter will automatically turn on. However, if

AC is brought up too slowly (i.e. adjusting a variac), the supply will not turn on and the

ON line will have to be toggled to turn on the supply. The output interconnect board

provided has the ON line already connected to an ON/OFF switch for manual

ON/OFF control via the ON line.

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EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

5

PCB Layout

Figure 6 – EP-12 Assembly Diagram.

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Page 12 of 40

01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

Figure 7 – EP-12 Top View.

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Page 13 of 40

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

6

Bill Of Materials

6.1 Electrical Bill of Materials

Item Qty Reference

Part Number

KBL06

Manufacturer

Gen. Semi.

Description

KBL06

1

2

3

4

5

6

7

8

1

2

1

2

7

BR1

CX1

CX2

CY1

CY4, CY3

C3, C2

C102, C4

C5

C19

C6

ECQ-U2A104ML

ECQ-U2A334MG

440LQ47

ECK-ATS222ME

200AXW330MK1835

200 pF, 1000 V, Y5P, 10%

ECA-2AHG010

ECA-1CHG220

ECA-1CHG470

ECU-S1H104MEA

Panasonic

Vishay/Sprague

Rubycon

0.1 µF, 250 VAC

0.33 µF, 250 VAC

47 pF, 1 kV (Safety)

2.2 nF(Safety)

330 µF, 200 V

2.2 nF, 1 kV

Xicon

Panasonic

1 µF, 100 V

9

10

11

22 µF, 16 V

47 µF, 16 V

C7, C13, C14,

C18, C103, C107

C8, C23

C9

0.1 µF, 50 V

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

2

1

2

1

2

1

2

1

2

1

3

2

1

2

1

9

ECU-S1H333MEA

K473K15X7RF5TL2

ECU-S1H102JCB

EEU-FC1C102

EEU-FC0J222

ECA-1AFQ122

ECU-S1H331JCA

ECA-2AHG2R2

ECU-SIH101JCA

10,000 pF, 500 V, Y5P, 10%

ECA-1AFQ102L

ECA-1AH6471

1N5407

BZY97C-180

BAV20

MBR2045CT

MBR3045WT

UF4002-1

1N5228B-D7

Panasonic

BC Components 0.047 µF, 50 V

0.033 µF

C10

C11

C15, C12

C16, C17

C20

Panasonic

Xicon

Panasonic

Diodes Inc.

Philips

Diodes Inc.

Int. Rect.

Fagor

Gen. Semi.

Diodes Inc.

Philips

0.001 µF, 50 V

1000 µF, 16 V

2200 µF, 6.3 V

1200 µF, 10 V

330 pF, 50 V

2.2 µF, 100 V

100 pF, 50 V

0.01 µF, 500 V

1000 µF, 10 V

470 µF, 10 V

1N5407

BZY97C-180

BAV20

MBR2045

MBR3045

UF4002

C21

C22

C101

C104, C105

C106

D1

D4, D5

D6, D18

D7, D9

D8

D11, D10

D12

1N5228

1N4148

BZX79-C B4V3

1N4006

BZY97-C200

1N5822

D13, D104, D105 1N4148-T

D14, D19

D101

1N4006G-T

BZY97-C200

1N5822

3721400041

Sleeving (Alpha TFT250 #18) Alpha

Diodes Inc.

Philips

Gen Semi

Wickmann

D3, D102

D103

F1

4 A

JP9 Sleeving

JP2, JP3, JP4,

JP5, JP6, JP7

Insulation/Sleeving

JUMPER

(cut from wire roll)

Belden

8019 000 #18

JP8, JP9, JP10, JP11

39

40

41

42

43

44

45

1

2

1

L1 coupled choke 13 µH/15 A

L5, L2

L3

DT Magnetics

Prem Mag

DT Magnetics

J.W. Miller

Panasonic

TOKO

13 µH

SPE-119-0

0.5 µH

Mag amp

20 µH, 12 A

8.2 mH

10 µH, 2 A

2N3906

L4

5702

L7

L101

Q1

ELF-18D650C

R622LY-100K

TO-92 Transistor/PNP

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Page 14 of 40

01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

Item Qty Reference

Part Number

Manufacturer

Description

TIP32C

2N3904

MPSA42

MPSA92

10 Ω

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

1

2

1

2

1

3

2

1

2

1

2

1

2

1

Q2

Q3, Q7

Q4

Q6

RT1

RV1

R1, R2

R3

R4

R6

R7

R8

R5

R9

R10

R39

R12

R13

R14

R15

R16, R23, R35

R31, R17

R18

R19

R20

R21

R22

R24

R25

R26

R11, R27

R28, R33

R29,

R30

R32

R34

TO-220 Power Transistor/PNP

TO-92 Transistor/NPN

TO-92 transistor/PNP 300 V

TO-92 transistor/NPN 300 V

RL3004-6.56-59-S7

ERZ-V14D431

Keystone

Panasonic

Yageo

DT Magnetics

275 V, 14 mm

330 kΩ

CFR-25JB-330k

CFR-25JB-2M2

CFR-25JB-560K

MFR-25FBF-130K

CFR-25JB-180K

CFR-25JB-47R

CFR-50JB-560K

CFR-25JB-3K3

CFR-25JB-7K5

CFR-25JB-10R

CFR-25JB-75K

CFR-25JB-1K8

CFR-25JB-1K0

CFR-25JB-15K

CFR-25JB-4K64

CFR-25JB-4K12

CFR-25JB-150K

CFR-25JB-270R

CFR-25JB-3R0

CFR-25JB-3K48

CFR-25JB-2K2

CFR-25JB-10K

CFR-25JB-390R

CFR-25JB-4K7

CFR-25JB-100K

RSF100JB-1R0

CFR-25JB-27K

CFR-25JB-33R

MFR-25FBF-43K2

CFR-25JB-10K

CFR-25JB-51R

CFR-25JB-4M0

CFR-25JB-430R

CFR-25JB-5k1

2.2 MΩ

560 kΩ

130 kΩ, 1%

180 kΩ

47 Ω

560 kΩ, 1/2 W

3.3 kΩ

7.5 kΩ

10 Ω

75 kΩ

1.8 kΩ

1 kΩ

15 kΩ

4.64 kΩ, 1%

4.12 kΩ, 1%

150 kΩ, 1%

270 Ω

3 Ω

3.48 kΩ, 1%

2.7 kΩ

10 kΩ

390 Ω

4.7 kΩ

100 kΩ

1 Ω, 1 W

27 kΩ

33 Ω

43.2 kΩ, 1%

10 kΩ

51 Ω

1 MΩ, 1%

430 Ω

5.1 kΩ

27 kΩ

PC Main

Transformer

PC Standby

Transformer

TOP247Y1

SFH615A-2

LTV817

TL431

R36

R37

R101

R103, R102

R104

R105, R38

R106

T1

CFR-25JB-27K

EER-28L

1

90

1

T101

EE-16

DT Magnetics

91

92

93

94

95

1

2

1

U1

U2

U102, U3

U6, U5

U101

TOP247Y1

SFH615A-2

LTV817

TL431

TNY266P

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TNY266P

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Page 15 of 40

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

6.2 Hardware Bill of Materials

Item Qty Reference

Description

PCB, Assembly Main

P/N

DAK-12

Manufacturer

Power

1

1 ea PCB, Main

Integrations

N/A

2

1 kit Enclosure/Hardware

Top & Bottom

N/A

Enclosure, Fan,

Fan Screws (2 ea),

AC Input Conn,

Voltage Selection Switch

Conn, Spade

3

4

5

6

7

8

1 ea Conn, Spade

2 ea Cap

31887

AMP

16-22 AWG, #10 PIDG

Cap, 470 pF, 20%

250 V, Ceramic Y2/X1

Wire, Grn/Yel, 18 AWG

UL1015, Pretinned

Wire, Wht, 18 AWG

UL1015, Pretinned

Wire, Blk, 18 AWG

UL1015, Pretinned

Wire, Wht, 22 AWG

UL1015, Pretinned

Tie Wrap, 4", Nylon

Screw, M3 X 5 mm

Screw, #6 X ¼

ECK-ATS471MB Panasonic

2.5” N/A

Any

4”

N/A

1015-18/1-0

Any

12” N/A

9

10

11

4 ea N/A

2 ea N/A

7 ea N/A

PLT1M

PANDUIT

Any

6N25PPBZZ

Pan Head, Type B,

Self Tap, Zinc Pltd

Insulator, Fishpaper Rev D

12

1 ea N/A

6.3 Output Cable Bill of Materials

Item Qty Reference

Description

P/N

Manufacturer

1

1 ea P2

Recp, 2 X 10

4.2 mm Mini-Fit Jr

39-01-2205

(94V-0)

MOLEX

2

17 ea N/A

Terminal, Crimp, Fem

AWG 18-24, Tin

39-00-0039

MOLEX

3

4

5

6

7

8

9

70” N/A

30” N/A

10” N/A

4 ea Conn A, B, C, F

Wire, Blk, 18 AWG, UL 1015

Wire, Red, 18 AWG, UL 1015

Wire, Org, 18 AWG, UL 1015

Wire, Yel, 18 AWG, UL 1015

Wire, Grn, 22 AWG, UL 1015

Wire, Vio, 22 AWG, UL 1015

Conn, Wire Pin

Any

MOLEX

19211-0001

11-01-0197

Term 10-12 AWG

Tool, Hand Crimper

10

Tool

MOLEX

Mini-Fit Jr. 18-24 AWG

Tool, Extraction Mini-Fit Jr

Tool, Hand Crimper

11

12

Tool

11-03-0044

19285-0063

MOLEX

Wire Pin Term (Molex 19211-0001)

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Page 16 of 40

01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

6.4 Heatsinks Bill of Materials

Item Qty Part Reference

Description

P/N

Manufacturer

1

2

3

4

5

6

7

8

1

4

1

4

1

Fab, H.S. Primary, EP-12 Rev. D

Fab, H.S. Secondary, EP-12 Rev. C

Scr, Phil Pan, M3 X 8, Stl, Znc

Scr, Phil Pan, M3 X 10, Stl, Znc

Wshr, Split Lock, M3

Wshr, Shldr, #4 [M2, 5]

Sil-Pad 600, Heatsink, TO-220

Sil-Pad TO-3P Heatsink, TO-247

U1, D7, D9, Q2

D8

U1

U1, D7, D9, Q2

D8

Olander Co.

Keystone

Berquist

3049

BER102

BER109

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Page 17 of 40

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

7

Transformer Specification

7.1 145 W Forward Transformer

Figure 8 - EP-12 145 W Forward Transformer.

7.1.1Electrical Specifications

Electrical strength

Primary Inductance

Resonant Frequency

Primary leakage inductance

60 Hz, 1 min, from Pins 1-7 to Pins 10-14

All windings open

3000 VAC

4.5 mH or Higher

0.2 MHz minimum

8 µH maximum

All windings open

Pins 6-14 shorted

7.1.2Materials

Item

Description

Core: PC40 EER28L

Bobbin: BEER28L-1114CPH

[1]

[2]

Magnet Wire: #28 AWG Heavy Nyleze

Magnet Wire: #30 AWG Heavy Nyleze

Magnet Wire: #20 AWG Heavy Nyleze

Copper ribbon .670″ x .008″

Tape: 3M 1298 Polyester Film (white) 21.8 mm wide by 2.2 mils thick

Tape: 3M 1298 Polyester Film (white) 15.8 mm wide by 2.2 mils thick

Tape: 3M 44 Margin tape (cream) 3.0 mm wide by 5.5 mils thick

[3]

[4]

[5]

[6]

[7]

[8]

[9]

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Page 18 of 40

01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

7.1.3 Transformer Build Diagram

Figure 9 – EP-12 145 W Forward Transformer Build Diagram.

7.1.4Transformer Construction

Margin Taping

Primary Winding

Basic Insulation

Margin Taping

Use item [9] for the right and left margins.

Start at pin 5. Wind 45 turns of item [3] from left to right. Wind

uniformly in a single layer. End at pin 1.

1 Layer of tape [8] for basic insulation.

Use item [9] for the right and left margins.

Start at pin 3. Wind trifilar 6 turns of item [4] from left to right.

Wind uniformly in a single layer, across entire width of bobbin.

Finish on pin 7.

Bias Winding

Reinforce Insulation

3 Layers of tape [7] for insulation.

Prepare copper ribbon [6] as shown in Figure 10. Match pin A

of the foil to pin 11 or 12 of the bobbin. Wind 3 turns of item

[6]. Finish by matching pin B of the foil to pins 8 and 9 of the

bobbin.

Copper Foil Winding

(5 V)

Reinforce Insulation

Margin Taping

3 Layers of tape [7] for insulation.

Use item [9] for the right and left margins.

Start at pin 13. Wind 4 turns of item [5] from left to right. Wires

are populated in middle of bobbin. Finish at pin 14.

3 Layers of tape [7] for insulation.

12 V Winding

Outer Insulation

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EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

Figure 10 – +5 V Foil (measurements are in mm).

Figure 11 – +5 V Foil and Tape.

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01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

7.2

10 W PC Standby Transformer

Figure 12 - EP-12 10 W Standby Transformer.

7.2.1Electrical Specifications

Electrical Strength

Primary Inductance

Resonant Frequency

1 min, 60 Hz, from pins 1-4 to pins 5-10

All windings open

3000 VAC

2.3 mH

800 kHz minimum

Primary Leakage Inductance

Pins 6-10 shorted

130 µH maximum

7.2.2Materials

Item

Description

Core: EE16

Bobbin: BE-16

Magnet Wire: #35 AWG Heavy Nyleze

Triple Insulated Wire: #26 AWG

Magnet wire #30 AWG heavy Nyleze

[1]

[2]

[3]

[4]

[5]

[6]

[7]

Tape: 3M 1298 Polyester Film (white) 9.0 mm wide by 2.2 mils thick

Varnish

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Page 21 of 40

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

7.2.3 Transformer Build Diagram

01-Feb-05

Figure 13 - EP-12 10 W Standby Transformer Build Diagram.

7.2.4Transformer Construction

Start at Pin 7. Wind 158 turns of item [3] from left to right, then from right to left

until done. It takes about 3 1/4 layers. Apply 1 layer of tape, item [5] between each

winding layer for basic insulation. Finish the wiring on Pin 5.

Primary Layer

Insulation

Bias Winding

Insulation

1 Layer of tape [6] for insulation.

Start at pin 9. Wind 17 turns of item [5] from left to right. Finish on pin 10.

1 Layer of tape [6] for insulation.

Start at Pin 2. Wind 7 bifilar turns of item [4] from left to right. Wind uniformly, in a

single layer, across entire width of bobbin. Finish on Pin 1.

3 Layer of tape [6] for insulation.

Secondary Winding

Outer Insulation

Final Assembly

Assemble and secure core halves. Impregnate uniformly [7].

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Page 22 of 40

01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

7.3 Output Coupled Inductor

7.3.1The Toroid Layout

Figure 14 - The Side View.

Figure 15 - Bottom Plate Viewed from Top.

(Measurements are in inches).

Figure 16 – EP-12 Inductor.

7.3.2 Inductances

Pin #

6-1

5-2

AWG #

18

Color

Red

# of Turns

Inductance (µH)

13 20%

12

16

18

13 20%

23 20%

3-4

Natural

Note:

1

2

All dimensions are 0.02”

Core = T 106 – 26

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Page 23 of 40

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

7.4 The Mag Amp Inductor

7.4.1Core Specification

Figure 17 – EP-12 Core Measurements.

Figure 18 – EP-12 Core.

Core Number

MP1305P-4AS

OD

14.4 mm

ID

7.9 mm

HT

6.6 mm

7.4.2Winding Instruction

Use number 18 AWG wire (heavy gauge Nyleze wire) to wind 7 turns around the

core as shown in Figure 18. Leave the wire legs about 1″ long.

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Page 24 of 40

01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

8

PIXls Design Spreadsheet

ACDC_TOPGXForward_Rev_1.03_061

802 Copyright Power Integrations Inc. INPUT

2002

ACDC_TOPGXFwd_061802_r103.xls:

TOPSwitch-GX Forward Transformer

Design Spreadsheet

INFO

OUTPUT

UNIT

OUTPUT VOLTAGE AND CURRENT

EP12 PC Main power supply

Main output voltage

VMAIN

5

Volts

IMAIN

12

3.3

12

4

Amps

Volts

Amps

Volts

Amps

Volts

Amps

Main output current

VMAINMA

IMAINMA

VAUX1

IAUX1

VIND1

IND1

Magamp output voltage

Magamp output current

Auxiliary output voltage

Auxiliary output current

Independent output voltage

Independent output current

Total output power

PO

147.6 Watts

ENTER APPLICATION VARIABLES

Minimum AC input voltage. Input voltage

doubler circuit is assumed.

VACMIN

90

AC volts

Maximum AC input voltage. Input voltage

doubler circuit is assumed.

VACMAX

132

AC volts

188 Volts

373 Volts

uFarads

Hz

VMIN

Minimum DC Bus voltage at low line input

Maximum DC Bus voltage at high line input

VMAX

Equivalent bulk input capacitance. Input

voltage doubler circuit is assumed.

CIN

165

fL

tc

50

Input AC line frequency

3.0

mSeconds Estimate input bridge diode conduction time

Minimum required hold-up time from

VDROPOUT to VHOLDUP

Efficiency estimate to determine minimum

DC bus voltage

th

16.0

0.75

mSeconds

EFF

DC Bus voltage at start of hold-up time

(default VMIN)

VHOLDUP

188 Volts

VDROPOUT

DMAX GOAL

VDSOP

132

0.7

132 Volts

0.70

DC Bus Voltage at end of hold-up time

Maximum duty cycle at DC dropout voltage

Maximum operating drain voltage

580 Volts

Maximum output current ripple factor at

maximum DC Bus voltage

KDI

0.15

Enter one ("1") for DC stacked, zero ("0")

Independent winding

REF AUX1

1

DC Stack

ENTER TOPSWITCH VARIABLES

TOPSwitch

Chosen Device

ILIMIT

top247

TOP247

Universal

Doubled 115V/230V

Power Out

-

165 W

3.348 3.852

Amps

Hertz

From TOPSwitch-GX datasheet

From TOPSwitch-GX+H76 datasheet

fS

124000 132000

limit reduction (KI=1.0 for default ILIMIT, KI

<1.0 for lower ILIMIT)

KI

0.81

Maximum current limit resistance to ensure

KI >= 0.81 setting

RX

7.78 kOhm

2.712 Amps

8.1 Volts

ILIMITEXT

VDS

External current limit

TOPSwitch-GX average on-state Drain to

Source Voltage

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Page 25 of 40

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

DIODE Vf SELECTION

Main output rectifiers forward voltage drop

(Schottky)

Magamp output rectifiers forward voltage

drop (Schottky)

Auxiliary output rectifiers forward voltage

drop (Ultrafast)

VDMAIN

0.5 Volts

0.7 Volts

VDMAINMA

VDAUX1

Independent output rectifiers forward voltage

drop (Schottky)

VDIND1

VDB

0 Volts

0.7 Volts

Bias output rectifier conduction drop

BRIDGE RECTIFIER DIODE

SELECTION

Maximum voltage across Bridge rectifier

diode

VPIVAC

IDAVBR

467 Volts

0.773 Amps

Average Bridge Rectifier Current

TRANSFORMER CORE SELECTION

Core Type

eer28l

Core

EER28L

P/N:

PC40EER28L-Z

EER28L_

BC

Bobbin

BEER-28L-112CPH

AE

LE

0.814 cm^2

7.55 cm

Core Effective Cross Sectional Area

Core Effective Path Length

AL

BW

2520 nH/T^2

21.8 mm

Ungapped Core Effective Inductance

Bobbin Physical Winding Width

Maximum actual gap when zero gap

specified

LG MAX

0.02 mm

Percentage of total PS losses lost in

transformer windings; default 10%

R FACTOR

9%

3.0

9% %

mm

M

Transformer margin

L

0.80

Transformer primary layers

Main rounded turns

NMAIN

3

TRANSFORMER DESIGN

PARAMETERS

NP

45

6

Primary rounded turns

Bias turns to maintain 8V minimum input

voltage, light load

NB

Auxiliary rounded turns (DC stacked on

Main winding)

NAUX1

4

Approx. Aux output voltage with NASUX1 =

4 Turns and DC stack

Independent rounded turns (separate

winding)

VAUX1 ACTUAL

NIND1

11.63 Volts

0

Approximate independent output voltage

with NIND1 = 0 turns

VIND1 ACTUAL

0.00 Volts

Maximum operating flux density at minimum

switching frequency

Maximum peak flux density at minimum

switching frequency

BM

1816 Gauss

2884 Gauss

BP

Minimum primary magnetizing inductance

(assumes LGMAX=20um)

LP MIN

3.419 mHenries

Peak magnetizing current at minimum input

voltage

IMAG

0.189 Amps

0.33 mm

OD_P

AWG_P

Primary wire outer diameter

Primary Wire Gauge (rounded to maximum

AWG value)

28 AWG

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01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

CURRENT WAVESHAPE

PARAMETERS

Maximum peak primary current at maximum

DC Bus voltage

IP

2.451 Amps

Maximum primary RMS current at minimum

DC Bus voltage

IPRMS

1.460 Amps

INDUCTOR OUTPUT PARAMETERS

Main / Auxiliary coupled output inductance

(referred to Main winding)

LMAIN

10.0 uHenries

Main / Auxiliary coupled output inductor full-

load stored energy

WLMAIN

KDIMAIN

2286 uJoules

0.150

Current ripple factor for Magamp output

LMAINMA

12.3 uHenries

888 uJoules

0.150

Magamp output inductance

Magamp output inductor full-load stored

energy

WLMAINMA

KDIMAINMA

Current ripple factor for Magamp output

LIND1

0.0 uHenries

0.0 uJoules

0.000

Independent output inductance

Independent output inductor full-load stored

energy

WLIND1

KDIIND1

Current ripple factor for independent output

SECONDARY OUTPUT PARAMETERS

Maximum transformer secondary RMS

current (DC Stack)

Maximum transformer secondary RMS

current (DC Stack)

Maximum transformer secondary RMS

current (DC Stack)

ISMAINRMSLL

15.61 Amps

2.42 Amps

0.00 Amps

ISAUX1RMSLL

ISIND1RMSDLL

Maximum average current, Main rectifier

(single device rating)

Maximum average current, Magamp rectifier

(single device rating)

Maximum average current, Auxiliary rectifier

(single device rating)

Maximum average current, Independent

rectifier (single device rating)

IDAVMAIN

IDAVMAINMA

IDAVAUX1

IDAVIND1

12.3 Amps

9.3 Amps

3.1 Amps

0.0 Amps

Maximum RMS current, Main output

capacitor

Maximum RMS current, Magamp output

capacitor

Maximum RMS current, Auxiliary output

capacitor

Maximum RMS current, Independent output

capacitor

IRMSMAIN

IRMSMAINMA

IRMSAUX1

IRMSIND1

0.52 Amps

0.17 Amps

0.00 Amps

DIODE PIV

No derating

VPIVMAIN

29.5 Volts

Main output rectifiers peak-inverse voltage

Magamp output rectifiers peak-inverse

voltage

Auxiliary output rectifiers peak-inverse

voltage

VPIVMAINMA

VPIVAUX1

34.9 Volts

Independent output rectifiers peak-inverse

voltage

VPIVIND1

VPIVB

0.0 Volts

102.1 Volts

Bias output rectifier peak-inverse voltage

Optocoupler

VCEO OPTO

49.8 Volts

Maximum optocoupler collector-emitter

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Page 27 of 40

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

voltage

UNDER-VOLTAGE LOCKOUT CIRCUIT

PARAMETERS

AC undervoltage lockout voltage; On-Off

transition

AC undervoltage lockout voltage; Off-On

transition

VACUVL

VACUV

68 AC volts

78 AC volts

VACUVX

RUVA

68

2.23 MOhm

523.73 kOhm

75.91 kOhm

Resistor RUVA value

Resistor RUVB value

Resistor RUVC value

RUVB

RUVC

Actual AC undervoltage lockout voltage; On-

Off transition

Actual AC undervoltage lockout voltage; Off-

On transition

VACUVL ACTUAL

VACUVX ACTUAL

67.50 AC volts

70.36 AC volts

DUTY CYCLE LIMIT CIRCUIT PARAMETERS

VZ

6.80 Volts

Zener voltage used within DLIM circuit

Approximate frequency reduction voltage

(determines CVS value)

VOV

380 Volts

RA

2.20 MOhm

40.26 kOhm

126.70 kOhm

92.98 pF

Resistor RA value

Resistor RB value

Resistor RC value

Resistor RD value

Capacitor CVS value

RB

RC

RD

CVS

DUTY CYCLE PARAMETERS (see

graph)

Dropout Duty-Cycle Parameters

Operating Duty cycle at DC Bus dropout

voltage

Transformer Reset Minimum duty cycle at

DC Bus dropout voltage

Device Min Duty cycle limit at DC Bus

dropout voltage

!!! >DMASRESET from VMIN to

VDROPOUT. NOT hazardous

DMAX ACTUAL

DMAX RESET

DXDO MIN

0.69

0.79

0.70

0.79

DXDO MAX

Caution

DLL ACTUAL

DXLL MIN

0.47

0.55

0.67

0.69

Duty cycle at minimum DC Bus voltage

Duty cycle minimum limit at minimum DC

Bus voltage

Duty cycle maximum limit at minimum DC

Bus voltage

Minimum duty cycle to reset transformer at

low line

DXLL MAX

DLL RESET

High Line Duty-Cycle Parameters

DHL ACTUAL

DXHL MIN

0.23

0.24

Duty cycle at minimum DC Bus voltage

Duty cycle minimum limit at maximum DC

Bus voltage

Duty cycle maximum limit at maximum DC

Bus voltage

DXHL MAX

0.35

Minimum duty cycle to reset transformer at

high line

DHL RESET

0.36

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01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

DX_MAX

D_RESET

D_ACTUAL

DX_MIN

Figure 19 – PIXls Duty Cycle Reduction Parameters Chart.

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Page 29 of 40

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

9

Test Results

Thermal and Dissipation Data

TOP247 dissipation at 90 VAC and 5 V at 15 A, 3.3 V at 7 A, 12 V at 4 A (approximately

140 W) was measured 5.4 W.

The unit was enclosed in a standard ATX enclosure. The ambient external temperature

around the enclosure was 25 °C and the internal ambient in the enclosure in the box

near TOP247 heatsink was measured 37 °C.

The TOP247 source tab temperature for above conditions was measured 53 °C.

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Page 30 of 40

01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

10 Performance Data

10.1 Efficiency and Regulation

Output Current

Output Voltage

Efficiency

Load Input VAC

+5 V

(A)

0.4

15

+12 V +3.3 V +5 VSB +5 V

+12 V +3.3 V +5 VSB

(A)

0.05

3

(A)

0.5

12

(A)

0

(V)

5.09

5.07

5.11

5.1

(V)

(W)

10

1

2

132

90

12.02

11.92

11.6

3.31

3.21

3.29

3.23

3.28

3.2

5.05

4.89

4.84

5.1

43%

71%

77%

72%

76%

74%

77%

71%

73%

64%

67%

74%

2

72

3

0.5

12

2

62

4

3

0

11.54

12.41

12.45

11.95

11.92

11.93

103

114

154

146

223

217

3.9

20

5

0.05

3

0.5

12

2

5

4.8

6

90

15

0

5

5.07

5.13

4.86

4.83

4.87

7

90

15

0.5

12

0

5.02

4.99

3.28

3.2

8

90

15

3

2

9

115

230

115

15

3

12

2

3.21

10

11

12

0.5

2

0.4

15

0.0168

1.9690

0.5

12

5.1

12.1

3.33

3.2

2

4.99

12.03

198

Note: 12 V load table does not include the 100 mA internal load, which is equivalent to

fan loading.

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Page 31 of 40

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EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

10.2 Power Limit vs. Input Line

Total Output Power (Watts) at Threshold

of Over Power Shutdown

179

178

177

176

175

174

173

172

171

90

100

110

120

130

140

AC Input (Volts)

Figure 20 – Power Limit vs. Input Line.

Standby Input Power

The input power with standby loaded to 0.5 W and main supply off at 115 VAC input is

0.91 W.

Note: when measuring for less than 1 W input power spec and output interconnect board

is used, the yellow standby on LED on the board dissipates 0.07 W. This should be

considered part of the output loading.

Blue Angel

240 VAC input, main converter inhibited, +5 V standby loaded to 2.5 A.

Input power is 4.2 W.

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Page 32 of 40

01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

11 Waveforms

+ 5 V output

3.3 V Output

0.5 A/div

Figure 21 – Primary Drain Current at Start-up,

Activated from Remote ON/OFF

with 120 VAC Input.

Figure 22 – +5 V and 3.3 V Rise at Turn-on from

Remote ON/OFF , 120 VAC Input,

5 V out at 12 A, 3.3 V at 12 A,

0 A on +12 V.

5 V Standby

5 V Main

5 V Standby

5 V Main

Figure 23 – 5 V Main and 5 V Standby Start-up

Figure 24 – 5 V and 5 V Standby Drop out After

AC off Max Load on 5 V Standby, Min

Load on all Other Outputs.

(120 VAC). Max Load on all Outputs.

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Page 33 of 40

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

11.1 Drain Switching Waveforms

5 V @ 12 A, 3.3 V @ 12 A, 12 V @ 3 A

Figure 25 – Drain to Source Voltage of TOP247

Figure 26 – Drain to Source Voltage of TOP247

at 165 VAC.

at 220 VAC.

Figure 27 – Drain to Source Voltage of TOP247

Figure 28 – Drain to Source Voltage of TOP247

at 270 VAC Input 3.3 V Output

Shorted at PC Board.

at 270 VAC.

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01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

5 V Standby

5 V Output

Input Line Current

Figure 30 – Drain Switching Voltage of TNY266

(PC Standby) 230 VAC Input

Figure 29 – 110 VAC Applied Line Terminated

with Following Loads: 5 V at 13 A,

3.3 V at 12 A, 12 V at 3.5 A.

5 V Loaded to 1.5 A.

Figure 31 – 5 V Step Load (8 A/15 A)

Maximum Continuous Load

on Other Outputs.

Figure 32 – 3.3 V Step Load 6 A/12 A.

+ 5 V Standby Output

Step Load 0.3 A to 1.5 A

Figure 33 – +5 V Standby Step Load Response.

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EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

11.2 Output Ripple Measurements

Output ripple measured with following load:

12 V @ 3 A, 5 V @ 12 A, 3.3 V @ 12 A, 5 V standby @ 2 A.

Figure 34 – +12 V Output Ripple.

Figure 35 – +5 V Output Ripple.

Figure 36 – +3.3 V Output Ripple.

Figure 37 – +5 V Standby Output Ripple.

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01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

12 Conducted EMI

Figure 38 – 230 VAC, Neutral Input, Maximum Load on all Outputs.

Figure 39 – 230 VAC Line Input, Maximum Load on all Outputs.

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Page 37 of 40

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

13 Revision History

Date

Author

Revision Description & Changes

09-Jul-02

AO

1.0

1.1

1.2

First release

Corrected schematic on page 8 and

caption on Figure 22

30-Aug-02

21-Oct-02

AO

Corrected Figure 11

Corrected 7.2.1 Primary Inductance on

page 21 and added missing Part

Numbers on page 15

01-Feb-05

AO

1.3

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Page 38 of 40

01-Feb-05

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

Notes

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Page 39 of 40

EPR-12 – PC Forward Converter with Standby Flyback Power Supply

01-Feb-05

For the latest updates, visit our website: 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.

The PI Logo, TOPSwitch, TinySwitch, LinkSwitch, DPA-Switch and EcoSmart are registered trademarks of

Power Integrations Worldwide Sales Support Locations

WORLD HEADQUARTERS

5245 Hellyer Avenue,

San Jose, CA 95138, USA

GERMANY

Rueckertstrasse 3,

D-80336, Munich, Germany

JAPAN

TAIWAN

5F-1, No. 316, Nei Hu Rd., Sec. 1

Nei Hu Dist.

Taipei, Taiwan 114, R.O.C.

Phone:

Fax:

Keihin-Tatemono 1st Bldg.

12-20 Shin-Yokohama,

2-Chome,

Kohoku-ku, Yokohama-shi,

Kanagawa 222-0033, Japan

Main:

+1-408-414-9200

Phone:

Fax:

+49-895-527-3910

+49-895-527-3920

Customer Service:

+886-2-2659-4570

+886-2-2659-4550

Phone:

Fax:

+1-408-414-9665

+1-408-414-9765

e-mail: eurosales@powerint.com

Phone:

Fax:

+81-45-471-1021

+81-45-471-3717

e-mail:

taiwansales@powerint.com

e-mail: usasales@powerint.com

e-mail:

japansales@powerint.com

CHINA (SHANGHAI)

Rm 807-808A, Pacheer,

Commercial Centre,

555 Nanjing West Road,

Shanghai, 200041, China

INDIA (TECHNICAL SUPPORT)

261/A, Ground Floor

7th Main, 17th Cross,

Sadashivanagar

KOREA

RM 602, 6FL

Korea City Air Terminal B/D,

159-6,

Samsung-Dong, Kangnam-Gu,

Seoul, Korea

UK (EUROPE & AFRICA

HEADQUARTERS)

1st Floor, St. James’s House

East Street

Farnham, Surrey GU9 7TJ

United Kingdom

Bangalore 560080

Phone:

Fax:

+86-21-6215-5548

+86-21-6215-2468

Phone:

Fax:

+91-80-5113-8020

+91-80-5113-8023

Phone:

Fax:

+82-2-2016-6610

+82-2-2016-6630

Phone:

Fax:

+44 (0) 1252-730-140

+44 (0) 1252-727-689

e-mail: chinasales@powerint.com

e-mail: indiasales@powerint.com

e-mail:

e-mail: eurosales@powerint.com

koreasales@powerint.com

CHINA (SHENZHEN)

Room 2206-2207, Block A,

Electronics Science & Technology

Bldg.,

2070 Shennan Zhong Road,

Shenzhen, Guangdong,

China, 518031

ITALY

Via Vittorio Veneto 12,

Bresso

Milano, 20091, Italy

Phone: +39-028-928-6001

Fax: +39-028-928-6009

e-mail: eurosales@powerint.com

SINGAPORE

APPLICATIONS HOTLINE

World Wide +1-408-414-9660

51 Newton Road,

#15-08/10 Goldhill Plaza,

Singapore, 308900

APPLICATIONS FAX

World Wide +1-408-414-9760

Phone:

Fax:

+65-6358-2160

+65-6358-2015

e-mail:

Phone:

Fax:

+86-755-8379-3243

+86-755-8379-5828

singaporesales@powerint.com

e-mail: chinasales@powerint.com

Power Integrations

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www.powerint.com

Page 40 of 40


型号：	EPR-12
厂家：	Power Integrations
描述：	Engineering Prototype Report for EP-12 - 145 W PC Forward Converter with TOP247 and 10 W 5 V Output Standby Flyback with TNY266 对于EP- 12工程原型报告 - 145 W¯¯ PC正激变换器TOP247和10 W 5 V输出反激式待机与TNY266 PC
文件：	总40页 (文件大小：1498K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

EPR-12 [POWERINT]

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