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參數資料
| 型號： | LT1105IN8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 1.5 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數： | 1/32頁 |
| 文件大小： | 452K |
| 代理商： | LT1105IN8 |
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1
LT1103/LT1105
Offline Switching Regulator
Load Regulation
Danger!! Lethal Voltages Present – See Text
I
±
1% Line and Load Regulation with No Optocoupler
I
Switch Frequency Up to 200kHz
I
Internal 2A Switch and Current Sense (LT1103)
I
Internal 1A Totem-Pole Driver (LT1105)
I
Start-Up Mode Draws Only 200
μ
A
I
Fully Protected Against Overloads
I
Overvoltage Lockout of Main Supply
I
Protected Against Underdrive or Overdrive to FET
I
Operates in Continuous or Discontinuous Mode
I
Ideal for Flyback and Forward Topologies
I
Isolated Flyback Mode Has Fully Floating Outputs
The LT
1103 Offline Switching Regulator is designed for
high input voltage applications using an external FET
switch whose source is driven by the open collector output
of the LT1103. The LT1103 is optimized for 15W to 100W
applications. For higher power applications or additional
switch current flexibility, the LT1105 is available and its
totem pole output drives the gate of an external FET.
Unique design of the LT1103/LT1105 eliminates the need
for an optocoupler while still providing
±
1% load and line
regulation in a magnetic flux-sensed converter. This sig-
nificantly simplifies the design of offline power supplies
and reduces the number of components which must cross
the isolation barrier to one, the transformer.
The LT1103/LT1105 current mode switching techniques
are well suited to transformer isolated flyback and forward
topologies while providing ease of frequency compensa-
tion with a minimum of external components. Low exter-
nal part count for a typical application combines with a
Fully Isolated Flyback 100kHz 50W Converter with Load Regulation Compensation
I
OUT
(A)
0
V
O
5.05
4.95
5.15
5.25
8
LT1103 TA02
4.85
4.75
2
4
6
10
4.80
4.90
5.00
5.10
5.20
1
3
5
7
9
220V
AC
270V
AC
85V
AC
110V
AC
FEATURES
DESCRIPTIO
N
U
I
Up to 250W Isolated Mains Converter
I
Up to 50W Isolated Telecom Converter
I
Fully Isolated Multiple Outputs
I
Distributed Power Conversion Networks
APPLICATIO
S
U
TYPICAL APPLICATIO
N
U
220k
1W
499
39
μ
F
35V
1000pF
100
1N4148
13k
1%
4.75k
1%
BUK426-800A
MBR2045
10
μ
H
5V
10A
50V
470
μ
F
*50V
3600
μ
F
WINDINGS FOR
OPTIONAL
±
12V
DC
OUTPUTS
10
1
μ
F
25V
220
μ
F
385V
BAV21
BAV21
390pF
1.5KE300A
5W
MUR150
BRIDGE
RECTIFIER
+
LINE
FILTER
85V
AC
TO 270V
AC
+
–
TRANSFORMER DATA:
COILTRONICS CTX110228-3
L
(PRI)
= 1.6mH
N
PRI
:N
SEC
= 1:0.05
N
BIAS
:N
SEC
= 1:0.27
18.7k
0.047
μ
F
1N4148
330
0.1
μ
F
LT1103 TA13
*OUTPUT CAPACITOR IS THREE 1200
μ
F,
50V CAPACITORS IN PARALLEL TO
ACHIEVE REQUIRED RIPPLE CURRENT
RATING AND LOW ESR.
OPTIONAL OUTPUT FILTER
0.047
μ
F
V
C
V
SW
GND
OSC
15V
LT1103
V
IN
FB
DANGER!!
HIGH VOLTAGE!!
+
+
+
+
+
, LTC and LT are registered trademarks of Linear Technology Corporation.
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