DI-30 Ver la hoja de datos (PDF) - Power Integrations, Inc
Número de pieza
componentes Descripción
Fabricante
DI-30 Datasheet PDF : 2 Pages
| |||
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).
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.
Key Design Points
• 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
clamp/reset circuit to maintain drain voltage < 600 V and
DC reduction to prevent transformer saturation.
MAX
• 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.
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.
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.
FROM MAIN
CONVERTER
5 V WINDING
RTN
D9
MBR2045
L3
Mag Amp
6 Turns
D11
UF4002
L4
20 µH
L5
0.5 µH
R22
3Ω
Q2
TIP32
R34
33 Ω
D10
UF4002
R23
1 kΩ
R25
2.7 kΩ
R27
390 Ω
C21
1 µF
50 V
C18
0.1 µF
50 V
U8
TL431
R24
3.84 kΩ
1%
R26
10 kΩ
1%
C14
1200 µF
10 V
Figure 2. Magamp for Independent 3.3 V Secondary Regulation.
3.3 V
C15
1200 µF
10 V
RTN
PI-3385-093002
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
APPLICATIONS HOTLINE
World Wide +1-408-414-9660
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 FAX
World Wide +1-408-414-9760
B
12/02
www.powerint.com
Share Link: 