DI-43 [POWERINT]
30 W, Universal Input, 12 V Supply with <250 mW No-load; 30 W，通用输入， 12 V电源\u003c 250 mW的空载
| 型号： | DI-43 |
| 厂家： | 
Power Integrations |
| 描述： | 30 W, Universal Input, 12 V Supply with <250 mW No-load |
| 文件： | 总2页 (文件大小：52K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
Design Idea DI-43
TOPSwitch®-GX 30 W, Universal Input,
12 V Supply with <250 mW No-load
Topology
Flyback
Device
Power Output
Input Voltage
Output Voltage
Application
Adapter
30 W
85-265 VAC
TOP244Y
12 V
Design Highlights
limiting the maximum overload power of the supply. The
reduced current limit allows continuous conduction mode
operation with a small transformer, reducing primary and
secondarypeakcurrents,optimizingefficiency,andreducing
component stress.
• High efficiency (79% minimum)
• Low component count
• Excellent input no-load consumption <200 mW at 115 VAC
and <250 mW at 230 VAC input
• Rugged supply includes UV/OV shutdown, thermal and
short circuit protection with auto-recovery
• Comfortably meets EN55022B and CISPR22B conducted
EMI standards
• Overload power delivery at 265 VAC limited to 160% of
rated load
Diode D1 and VR1 form a clamp circuit that absorbs leakage
inductance energy during normal operation, with Zener VR1
clamping the voltage to a safe level. Capacitor C2 diverts
someoftheleakageenergyfromVR1,reducingitstemperature
and increasing overall efficiency. After clamping, reverse
current flows through D1, recovering some of the clamp
energy. R3 limits the reverse current in D1 and improves
EMI by limiting drain voltage ringing.
Operation
TheTOPSwitch-GXintegratesmanyfeaturestoimplementlow
cost, switched mode power supplies.
Resistors R9 and R10 set the output voltage. Components
C10 and R8 provide compensation with R6 setting DC loop
gain. Using a TL431 error amplifier gives better regulation
and output voltage tolerance than a Zener reference and also
provides better no-load performance due to lower (1 mA)
bias current.
A single resistor (R1) implements input UV/OV protection
usingtheLpin(UVtyp.100VDC;OVtyp.450VDC). Resistor
R4 programs the U1 current limit to 85% of nominal, and
resistor R2 reduces this current limit as input voltage increases,
C7
2.2 nF
Y1
C12
R11
470 pF 33 Ω
100 V 1/4 W
D3
MBR10100
L2
3.3 µH
T1
12 V, 2.5 A
6,7
1
3
C2
4.7 nF
1 kV
C6
680 µF
35 V
C7
680 µF
35 V
C8
100 µF
35 V
BR1
2 A, 600 V
VR1
P6KE
200
R3
47 Ω
1/2 W
RTN
9,10
D2
1N4148
D1
UF4005
5
4
C3
1 µF
50 V
L1
22 mH
R7
15 kΩ
R1
2 MΩ
1/2 W
C1
100 µF
400 V
R2
8.2 MΩ
U2
ISP817C
R9
38.3 kΩ
1%
1/2 W
CX1
TOPSwitch-GX
D
S
L
220 nF
D4
250 VAC
R6
CONTROL
1N4148
U1
TOP244Y
C
1 kΩ
R8
4.7 kΩ
F1
3.15 A
C11
10 µF
35 V
R5
X
F
C10
47 nF
6.8 Ω
C4
100 nF
L
R4
8.25 kΩ
1%
C5
47 µF
10 V
U3
TL431
85-265 VAC
N
R10
10 kΩ
1%
PI-3405-112702
Figure 1. TOPSwitch-GX 12 V, 30 W Universal Power Supply.
November 2002
DI-43
www.powerint.com
DI-43
Optional components D4, C11, and R7 implement soft finish
to limit startup overshoot. Resistor R7 discharges this soft-
finish capacitor at power down.
TRANSFORMER PARAMETERS
EF25 Nippon Ceramic NC-2H
LG of 264 nH/T2
Core Material
Bobbin
A
Key Design Points
EF25 10 pin
(Miles Platts FE0100 with TBS-601)
• Use reflected voltage from 90 V to 120 V
Primary: 58T x 26 AWG
Bias: 2T x 26 AWG
12 V: 6T 4 x 25 AWG T.I.W.
(T.I.W. = Triple Insulated Wire)
• Compact layout for components D3, C6 and C7 will
improve efficiency. Make sure the both capacitors C6 and
C7 have equal secondary loop areas to balance the ripple
currents in each.
• Clamp: for lowest cost use an RCD clamp replacing Zener
VR1 with a power resistor. For best no-load performance,
use the Zener clamp as shown.
• Reference voltage: Use low current Zener secondary
reference with 5 mA bias current for lowest cost. Use
TL431 as shown for both better regulation accuracy and
no-load consumption (due to lower bias current 1 mA).
Winding Details
Winding Order
(Pin Numbers)
1/2 Primary, tape, 1/2 primary (1-3),
tape, Bias (5-4), tape,
12 V (9-10, 6-7), tape
Primary: 876 µH ± 10% at 132 kHz,
Leakage: 28 µH (maximum)
Inductance
Primary Resonant Frequency
570 kHz (minimum)
Table 1. Transformer Construction Information.
.35
.30
.25
.20
.15
.10
.05
0
80
120
160
200
240
280
AC Input Voltage
Figure 2. PIN vs VIN Curve.
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:
EUROPE & AFRICA
Power Integrations (Europe) Ltd.
United Kingdom
SINGAPORE
Power Integrations, Singapore
Republic of Singapore 308900
TAIWAN
Power Integrations
International Holdings, Inc.
Taipei, Taiwan
Phone:
Fax:
Phone:
Fax:
+44-1344-462-300
+44-1344-311-732
Phone:
Fax:
+65-6358-2160
+65-6358-2015
+886-2-2727-1221
+886-2-2727-1223
Phone:
Fax:
+1 408-414-9665
+1 408-414-9765
e-mail: eurosales@powerint.com
e-mail: singaporesales@powerint.com
e-mail: taiwansales@powerint.com
KOREA
JAPAN
e-mail: usasales@powerint.com
Power Integrations
International Holdings, Inc.
Seoul, Korea
Power Integrations, K.K.
Keihin-Tatemono 1st Bldg.
Japan
INDIA (Technical Support)
Innovatech
Bangalore, India
Phone:
Fax:
CHINA
Power Integrations International
Holdings, Inc.
Phone:
Fax:
+82-2-782-2840
+82-2-782-4427
Phone:
Fax:
+81-45-471-1021
+81-45-471-3717
+91-80-226-6023
+91-80-228-9727
China
Phone:
Fax:
+86-755-8367-5143
+86-755-8377-9610
e-mail: koreasales@powerint.com
e-mail: japansales@powerint.com
e-mail: indiasales@powerint.com
APPLICATIONS HOTLINE
World Wide +1-408-414-9660
APPLICATIONS FAX
World Wide +1-408-414-9760
e-mail: chinasales@powerint.com
A
11/02
www.powerint.com
相关型号：
©2020 ICPDF网 联系我们和版权申明