Pc Main Ps.pdf

(482 KB) Pobierz
DI-30 REV 09-27-02
Design Idea DI-30
TOPSwitch-GX
180 W PC Main SFX Supply
®
®
Application
PC Main
Device
Power Output
180 W
Input Voltage
Output Voltage
Topology
TOP249Y
90-130 VAC / 180-265 VAC
3.3 V / 5 V / 12 V / -12 V
Forward
Design Highlights
C3) balancing circuit, operating only as needed to minimize
zero-load power consumption.
• 180 W cont. (200 W peak) in PC SFX form factor
• Includes passive power factor correction (PFC)
• TOPSwitch-GX integrated features enable extremely low
component count
• Meets 1 W standby spec (0.91 W input, 0.5 W output)
• High efficiency (71% minimum)
• Integrated line undervoltage and overvoltage detection
• Low EMI due to frequency jitter
• SOURCE referenced TO-220 tab lowers conducted EMI
• Maximum duty cycle reduction (DC MAX ) prevents transformer
saturation for fault and transient loads
• Uses conventional magamp for 3.3 V output
• Meets CISPR22B/EN55022B conducted EMI
Resistors R3, R5 and R6 implement start-up undervoltage
lockout, which prevents the supply from starting below
180 VDC. Components R4, R14, Q1 and R30 implement an
independent undervoltage using the X pin, which allows the
supply to continue delivering power all the way down to
140 VDC (increasing holdup time). Resistor R7 provides
additional hysteresis.
The primary side components D1, VR3-5 and C4, along with
secondary side C9 and R30, implement the Zener/capacitor
reset/clamp circuit. This circuit provides reset voltage for the
transformer and clamps the DRAIN pin voltage to a safe level
(<~600 V) under all conditions.
Operation
The reset circuit works in conjunction with the DC MAX
reduction circuit (R8, R36, C22, VR19 and D18) to limit the
maximum duty cycle and prevent transformer saturation
under fault and transient conditions.
TOPSwitch-GX integrates many features designed for use with
forward converters. Passive power factor correction (PFC) is
implemented using inductors LPFC1 and LPFC2. Transistors
Q4, Q6, R1, R2, R3, R5, and R6 form an active capacitor (C2,
C10
1 nF
50 V
Coupled
choke
L1
1 3 µ H
5
4
+12 V
2
1 4
C11
1000 µ F
16 V L2
0.5 µ H
C4
2.2 nF
1 kV
R3
2.2 M Ω
D7
MBR3045
7, 8
1, 2
R1
330 k Ω
C9
47 nF
50 V
R4
2.2 M Ω
1 3
6
3
+5 V
R5
180 k Ω
D1
1N5407
R30
1 Ω
1 W
BR1
KBL06
Q4
MPSA42
C2
470 µ F
200 V
1
C13
220 µ F
63 V
8 , 9, 10
D8
MBR6045
C12
2200 µ F
6.3 V
R21
270 Ω
CY3
2.2 nF
(Safety)
LPFC1
R6
2.2 M Ω
C20
330 pF
50 V
TO
MAGAMP OUT
(3.3 V)
L PFC2
11,12
RTN
JP9
CY4
2.2 nF
(Safety)
TOPSwitch-GX
U1
TOP249
C27
330 pF
50 V
R11
330 Ω
C24
330 µ F
25 V
3
D6
BAV20
R13
10 Ω
C5
1 µ F
100 V
C25
1 µ F
50 V
R18
4.74 k Ω
1%
R15
1.8 k Ω
CX1
0.047 µ F
250 VAC
Q6
MPSA92
R8
130 k Ω
1%
R36
43.2 k Ω
1%
D18
BAV20
4
LM
320
- 12 V
To AC Selector
Switch
L7
8.2 mH
D20
UF4002
R7
560 k Ω
VR19
1N5229
C22
100 pF
50 V
VR3
BZY97C-
200
D
L
C17
100 nF
50 V
CX2
0.33 µ F
250V
R20
270 k Ω
CONTROL
C3
470 µ F
200 V
C
R16
1 k Ω
R10
560 K
1/2 W
VR4
BZY97C-
180
VR5
BZY97C-
180
R11
300 Ω
U2
SFH615A-2
RT1
10 Ω
S
X
F
C8
0.033 µ F
50 V
R9
47 Ω
C16
100 nF
50 V
Q1
2N3908
R17
15 k Ω
RV1
275 V, 14 mm
R2
330 k Ω
R30
3.3 k Ω
C6
47 µ F
16 V
R14
75 k Ω
D105
1N4148
U5
TL431
R19
4.12 k Ω
1%
PI-3384-120902
R12
12 k Ω
+12 V STBY
R38
5.1 k Ω
R106
27 k Ω
U3
LTV817
Remote
ON/OFF
F1
4 A
C7
100 nF
50 V
Q7
2N3904
C23
33 nF
50 V
R37
10 k Ω
L
G
N
Figure 1. 180 W (200 W pk.) PC Main Power Supply Schematic (Note: Schematic does not include transformer Y-capacitor) .
DI-30
www.powerint.com
December 2002
184089203.132.png 184089203.143.png 184089203.154.png 184089203.165.png 184089203.001.png 184089203.012.png 184089203.023.png 184089203.034.png 184089203.045.png 184089203.056.png 184089203.066.png 184089203.076.png 184089203.087.png 184089203.092.png 184089203.093.png 184089203.094.png 184089203.095.png 184089203.096.png 184089203.097.png 184089203.098.png 184089203.099.png 184089203.100.png 184089203.101.png 184089203.102.png 184089203.103.png 184089203.104.png 184089203.105.png 184089203.106.png 184089203.107.png 184089203.108.png 184089203.109.png 184089203.110.png 184089203.111.png 184089203.112.png 184089203.113.png 184089203.114.png 184089203.115.png 184089203.116.png 184089203.117.png 184089203.118.png 184089203.119.png 184089203.120.png 184089203.121.png 184089203.122.png 184089203.123.png 184089203.124.png 184089203.125.png 184089203.126.png 184089203.127.png 184089203.128.png 184089203.129.png 184089203.130.png 184089203.131.png
 
184089203.133.png 184089203.134.png 184089203.135.png 184089203.136.png 184089203.137.png 184089203.138.png 184089203.139.png 184089203.140.png 184089203.141.png 184089203.142.png 184089203.144.png 184089203.145.png 184089203.146.png 184089203.147.png 184089203.148.png 184089203.149.png 184089203.150.png 184089203.151.png 184089203.152.png 184089203.153.png 184089203.155.png 184089203.156.png 184089203.157.png 184089203.158.png 184089203.159.png 184089203.160.png 184089203.161.png 184089203.162.png 184089203.163.png 184089203.164.png 184089203.166.png 184089203.167.png 184089203.168.png 184089203.169.png 184089203.170.png 184089203.171.png 184089203.172.png 184089203.173.png 184089203.174.png 184089203.175.png 184089203.002.png 184089203.003.png 184089203.004.png 184089203.005.png 184089203.006.png 184089203.007.png 184089203.008.png 184089203.009.png 184089203.010.png 184089203.011.png 184089203.013.png 184089203.014.png 184089203.015.png 184089203.016.png 184089203.017.png 184089203.018.png 184089203.019.png 184089203.020.png 184089203.021.png 184089203.022.png 184089203.024.png 184089203.025.png 184089203.026.png 184089203.027.png 184089203.028.png 184089203.029.png 184089203.030.png 184089203.031.png 184089203.032.png 184089203.033.png 184089203.035.png 184089203.036.png 184089203.037.png 184089203.038.png 184089203.039.png 184089203.040.png 184089203.041.png 184089203.042.png 184089203.043.png 184089203.044.png 184089203.046.png 184089203.047.png 184089203.048.png 184089203.049.png 184089203.050.png 184089203.051.png 184089203.052.png 184089203.053.png 184089203.054.png 184089203.055.png 184089203.057.png 184089203.058.png 184089203.059.png
 
DI-30
The components R12, C7, R38, Q7, C23, R37, U3, R106 and
D105 implement the remote ON/OFF drive circuit. During
the ON state, U3 and hence Q7 conduct, pulling the X pin to
SOURCE via resistor R12 (which sets the current limit).
clamp/reset circuit to maintain drain voltage < 600 V and
DC MAX reduction to prevent transformer saturation.
•Maintain maximum flux density on transformer (T1)
< 2500 gauss.
• Check for balanced currents on coupled inductor (L1) for
all load combinations.
• Use PI Expert ( PIXls ) Design Spreadsheet and refer to
Application Note AN-30 for details on designing forward
converters with TOPSwitch-GX.
During the OFF state, U3 and Q7 are off, allowing the X pin
to be pulled high by the +15 V standby supply via R38 and R12
and putting the TOPSwitch-GX into the OFF state. Components
R38 and D105 reduce device consumption to around 2mW by
supplying external current to the CONTROL pin from the
+15 V standby supply. Resistor R11 is required to allow
external bias feed.
This particular PC SFX 12 specification delivers a larger
proportion of power on the 12 V winding; efficiency would be
lower if that power were drawn from the 3.3 V output.
Key Design Points
Due to the complexity of this design it is not possible to include
all details in this Design Idea. An Engineering Prototype Report
(EPR) will be available for this design Dec. 2000. For updates
and all other information please refer to Power Integrations'
Web site.
• The passive PFC inductors (LPFC1 and LPFC2) are
constrained by both thermal and efficiency requirements.
Design of these inductors is not covered in this Design Idea.
• Transformer reset: Use recommended Zener/capacitor
D9
MBR2045
L4
20 µ H
L5
0.5 µ H
FROM MAIN
CONVERTER
5 V WINDING
3.3 V
L3
Mag Amp
6 Turns
R22
3 Ω
R23
1 k Ω
R25
2.7 k Ω
R24
3.84 k Ω
1%
Q2
TIP32
C14
1200 µ F
10 V
C15
1200 µ F
10 V
R34
33 Ω
R27
390 Ω
C18
0.1 µ F
50 V
D11
UF4002
C21
1 µ F
50 V
D10
UF4002
U8
TL431
R26
10 k Ω
1%
RTN
RTN
PI-3385-093002
Figure 2. Magamp for Independent 3.3 V Secondary Regulation.
For the latest updates, visit our Web site: 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, nor does it convey any
license under its patent rights or the rights of others. 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 and EcoSmart are registered trademarks of Power Integrations, Inc.
PI Expert is a trademark of Power Integrations, Inc. ©Copyright 2002, Power Integrations, Inc.
WORLD HEADQUARTERS
AMERICAS
Power Integrations, Inc.
San Jose, CA 95138 USA
Customer Service:
Phone: +1 408-414-9665
Fax: +1 408-414-9765
e-mail: usasales@powerint.com
CHINA
Power Integrations International
Holdings, Inc.
China
Phone: +86-755-8367-5143
Fax: +86-755-8377-9610
e-mail: chinasales@powerint.com
EUROPE & AFRICA
Power Integrations (Europe) Ltd.
United Kingdom
Phone: +44-1344-462-300
Fax: +44-1344-311-732
e-mail: eurosales@powerint.com
KOREA
Power Integrations
International Holdings, Inc.
Seoul, Korea
Phone: +82-2-782-2840
Fax: +82-2-782-4427
e-mail: koreasales@powerint.com
SINGAPORE
Power Integrations, Singapore
Republic of Singapore 308900
Phone: +65-6358-2160
Fax: +65-6358-2015
e-mail: singaporesales@powerint.com
JAPAN
Power Integrations, K.K.
Keihin-Tatemono 1st Bldg.
Japan
Phone: +81-45-471-1021
Fax: +81-45-471-3717
e-mail: japansales@powerint.com
TAIWAN
Power Integrations
International Holdings, Inc.
Taipei, Taiwan
Phone: +886-2-2727-1221
Fax: +886-2-2727-1223
e-mail: taiwansales@powerint.com
INDIA (Technical Support)
Innovatech
Bangalore, India
Phone: +91-80-226-6023
Fax: +91-80-228-9727
e-mail: indiasales@powerint.com
APPLICATIONS HOTLINE APPLICATIONS FAX
World Wide +1-408-414-9660 World Wide +1-408-414-9760
B
12/02
www.powerint.com
184089203.060.png 184089203.061.png 184089203.062.png 184089203.063.png 184089203.064.png 184089203.065.png 184089203.067.png 184089203.068.png 184089203.069.png 184089203.070.png 184089203.071.png 184089203.072.png 184089203.073.png 184089203.074.png
 
184089203.075.png 184089203.077.png 184089203.078.png 184089203.079.png 184089203.080.png 184089203.081.png 184089203.082.png 184089203.083.png 184089203.084.png 184089203.085.png 184089203.086.png 184089203.088.png 184089203.089.png 184089203.090.png 184089203.091.png

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin