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522982D Datasheet

  • 522982D

  • IC-OFFLINE SWITCHING REGULATOR

  • 434.45KB

  • 28頁

  • ETC

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LT1103/LT1105
Offline Switching Regulator
FEATURES
s
s
s
s
s
s
s
s
s
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DESCRIPTION
The LT1103 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鈥?00W
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 opto-coupler while still providing
鹵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 for-
ward topologies while providing ease of frequency com-
pensation with a minimum of external components. Low
external part count for a typical application combines with
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
鹵1%
Line and Load Regulation with No Opto-Coupler
Switch Frequency up to 200kHz
Internal 2A Switch and Current Sense (LT1103)
Internal 1A Totem Pole Driver (LT1105)
Start-Up Mode Draws Only 200碌A(chǔ)
Fully Protected Against Overloads
Overvoltage Lockout of Main Supply
Protected Against Underdrive or Overdrive to FET
Operates in Continuous or Discontinuous Mode
Ideal for Flyback and Forward Topologies
Isolated Flyback Mode Has Fully Floating Outputs
APPLICATIONS
s
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Up to 250W Isolated Mains Converter
Up to 50W Isolated Telecom Converter
Fully Isolated Multiple Outputs
Distributed Power Conversion Networks
TYPICAL APPLICATION
Fully-Isolated Flyback 100kHz 50W Converter with Load Regulation Compensation
OPTIONAL OUTPUT FILTER
85 - 270V
AC
MBR2045
10碌H
5V
10A
+
+
鈥?/div>
1000pF 100鈩?/div>
BRIDGE
RECTIFIER
+
LINE
FILTER
220碌F
385V
499鈩?/div>
220k
1W
ER!!
ANG TAGE!!
D
VOL
IGH
H
1N4148
1.5KE300A
5W
MUR150
+
*50V
3600碌F
*OUTPUT CAPACITOR IS THREE 1200碌F,
50V CAPACITORS IN PARALLEL TO
ACHIEVE REQUIRED RIPPLE CURRENT
RATING AND LOW ESR.
WINDINGS FOR
OPTIONAL
鹵12V
DC
OUTPUTS
BAV21
BAV21
1N4148
39碌F
35V
18.7k
FB
GND
4.75k
1%
0.047碌F
330鈩?/div>
0.047碌F
0.1碌F
15V
V
C
OSC
390pF
V
IN
V
SW
LT1103
BUK426-800A
+
10鈩?/div>
TRANSFORMER DATA:
COILTRONICS - CTX110228-3
L
(PRI)
= 1.6mH
N
PRI
:N
SEC
= 1:0.05
N
BIAS
:N
SEC
= 1:0.27
V
OUT
(V)
13k
1%
+
1碌F
25V
LT1103 TA13
Danger!! Lethal Voltages Present 鈥?See Text
U
U
U
+
50V
470碌F
Load Regulation
5.25
5.20
5.15
5.10
5.05
5.00
4.95
4.90
4.85
4.80
4.75
0
1
2
3
4
5
I
OUT
(A)
LT1103 TA02
220V
AC
270V
AC
110V
AC
85V
AC
6
7
8
9
10
1

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