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【英飞凌DIY】反激电源

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xinbajiang
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高级工程师
  • 2017-12-20 17:24:21
Design Example Report

 Title

Flyback power supply Engineering report

Specification

Input : 100Vac ~ 250Vac 47-63Hz

Output : 12V@1A

 Application

 
AC/DC converter
Author

 

Date

2017,12,20

Revision

Rev1

1. Introduction

This document describes the performances of a 20W evaluation board, with wide range operation voltage for input and power factor correction. The demo board is used a single chip solution. The demo board is designed for a universal AC/DC solution based on UC3842.
This demo board utilizes a common UC3842 IC and a current transformer to control a traditional Flyback topology which can get high efficiency and reduces the components count a lot. The topology operates at a fixed frequency with the input voltage. This demo board optimized the ratio of performance and price, design is quite easy. The demo board mainly utilized Cool MOSFET from Infineon 
Description
Symbol
Min
Typ.
Max
Unit
Input
Voltage
Vin
100
220
250
V
Frequency
Flin
47
50
63
 
PowerFactors
PF
 
 
 
 
Output
Voltage
Vo
10
12
13
V
Current
Io
 
1.5
3
A
Power
Po
 
20
 
W
Efficiency
ƞ
 
86
 
%

3. Electrical requirements
Input Characteristics

3.1 AC Input Voltage

The power will operate over the entire input voltage range (85‐305 VAC). 

Minimum
Maximum
Nominal/Rated
100V
250V
100-250 VAC
3.2 Frequency

The input frequency range will be 47Hz to 63Hz.

3.3 Input Current

The input current will not exceed 0.5Amp(rms.) for 100VAC.

3.4 Efficiency

The power efficiency (watts output/watts input) will not be less than 80% typically at full load condition (230VAC)

3.5 Output Characteristics

DC Load Characteristics 

Output Voltage

Minimum Current
Maximum Current
12VDC

0.0A

3A

4. Schematic





5.PCB Layout

This PCB is single side board made of FR4 with 1Oz copper.(unit mm)

Top silkscreen


Top layer




Bottom layer


8.Bill Of Material 

Bill of Materials

 

 
Source Data From:

UC3842反激式开关电源.Sch

 

Project:

Free Documents

 

Variant:

None

 

 

 

 

 

 

 

 

Creation Date:

2017/12/19

16:12:47

 

Print Date:

43088

43088.67577

 

Footprint

Comment

LibRef

Designator

Description

Quantity

FIX_POINT_3MM

 

FIX_POINT_3MM

1, 2

 

2

RADIATOR_12MM*35MM

 

RADIATOR_12MM*35MM

1,  2

 

2

FIX_POINT_3MM

 

FIX_POINT_3MM

3,  4

 

2

CD6

1000u

ELECTRO2

C17, C18, C19, C20, C21

Electrolytic Capacitor

5

CB2

103

CAP

C22, C24

Capacitor

2

CB1

103

CAP

C23

Capacitor

1

CD12

10U

ELECTRO2

C25

Electrolytic Capacitor

1

CB1

102

CAP

C26, C27

Capacitor

2

CB1

472

CAP

C28

Capacitor

1

CB1

104

CAP

C29

Capacitor

1

CD6

10u

ELECTRO1

C30

Electrolytic Capacitor

1

CD6

1000u/16

ELECTRO2

C31

Electrolytic Capacitor

1

CD6

100u

ELECTRO2

C32

Electrolytic Capacitor

1

4007

1N5819

DIODE

D13, D14, D15, D16, D17, D18

Diode

6

4007

4007

DIODE

D19, D20, D21, D22

Diode

4

4007

UF4007

DIODE

D23

Diode

1

4007

FR107

DIODE

D24

Diode

1

0805

FUSE2

FUSE2

F2

Fuse

1

XH2.54_6P

12V

HEADER 6

JP1

 

1

XH2.54_2P

5V

HEADER 2

JP6

 

1

XH2.54_2P

AC

HEADER 2

JP7

 

1

XH2.54_3P

+-12V

HEADER 3

JP8

 

1

EMI_9MM*9MM

EMI_L

EMI_L

L2

 

1

CON1_1MM

TIP

TIP

P1

 

1

CON1_1MM

TIP3

TIP

P6

 

1

CON1_1MM

TIP4

TIP

P7

 

1

CON1_1MM

-12

TIP

P8

 

1

CON1_1MM

TIP1

TIP

P9

 

1

CON1_1MM

TIP2

TIP

P10

 

1

TO220L

2N60

MOSFET N

Q2

 

1

RT

5

RT

R17

 

1

RP3

47k

POT2

R18

Potentiometer

1

1/4W

47K

RES2

R19

 

1

1/4W

10K

RES2

R20

 

1

2W

10K

RES5

R21

 

1

2W

120K

RES5

R22

 

1

1/4W

20

RES2

R26

 

1

1/4W

20K

RES2

R29

 

1

1/4W

5.1K

RES2

R30

 

1

1/4W

1K

RES2

R31

 

1

1/4W

1

RES2

R32

 

1

EE19L

EE19

EE19

T2

 

1

DIP8

UC3842

UC3842

U3

 

1

TO220L

7805

78**

U4

 

1

 

 

 

 

 

61

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