LT1103_15 Datasheet, PDF (32/32 Pages) Linear Technology – Offline Switching Regulator

LT1103/LT1105
TYPICAL APPLICATION
Minimum Parts Count Fully-Isolated Flyback 100kHz 50W Converter
85V_AC TO 270V_AC
+
+
–
BRIDGE
RECTIFIER
+
LINE
FILTER
220µF
385V
499Ω
220k
1W
HIGDHANVGOELRT!A!GE!!
1.5KE300A
5W
MUR150
1000pF
100Ω
1N4148
BAV21
BAV21
V_IN
16.2k
1%
+
39µF
25V
FB
5.36k
GND
1%
0.047µF
BUK426-800A
V_SW
LT1103
10Ω
15V
V_C
OSC
+
1µF
25V
390pF
330Ω
0.1µF
OPTIONAL OUTPUT FILTER
MBR2045
10µH
5V
+
35V
10A
+
50V
3600µF
470µF
*OUTPUT CAPACITOR IS THREE 1200µF,
50V CAPACITORS IN PARALLEL TO
ACHIEVE REQUIRED RIPPLE CURRENT
RATING AND LOW ESR.
WINDINGS FOR
OPTIONAL
±12V_DC OUTPUTS
TRANSFORMER DATA:
COILTRONICS - CTX110228-3
L_(PRI) = 1.6mH
N_PRI:N_SEC = 1:0.05
N_BIAS:N_SEC = 1:0.27
LT1103 TA01
Danger!! Lethal Voltages Present – See Text
Load Regulation
5.25
5.20
5.15
5.10
270V_AC
5.05
220V_AC
5.00
4.95
110V_AC
4.90
4.85
85V_AC
4.80
4.75
0 1 2 3 4 5 6 7 8 9 10
I_OUT (A)
LT1103 TA14
RELATED PARTS
PART NUMBER
LT1241
LT1246
LT1248
LT1249
LT1508
LT1509
DESCRIPTION
High Speed Current Mode Pulse Width Modulators
Off-Line Current Mode PWM
Power Factor Controller
Power Factor Controller
Power Factor and PWM Controller
Power Factor and PWM Controller
COMMENTS
Up to 500kHz Operation
1MHz Operation
Programmable Frequency, 16-Pin SO
100kHz, SO-8
Voltage Mode
Current Mode
32 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^q FAX:[phone] ^q www.linear-tech.com
11035fd LT/TP 0998 REV D 2K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1992