LT1963A Series
Typical applicaTions
SCR Pre-Regulator Provides Efficiency Over Line Variations
L1
500µH
LT1963A-3.3
3.3V
1.5A
OUT
IN
OUT
L2
1N4148
1k
+
+
10VAC AT
115V
SHDN
GND
FB
10000µF
22µF
IN
90-140
VAC
34k*
10VAC AT
115V
IN
1N4002
“SYNC”
1N4002
1N4002
12.1k*
+V
2.4k
C1A
TO ALL “+V”
POINTS
200k
+
1N4148
+
1/2
22µF
750Ω
LT1018
0.1µF
–
+V
C1B
+
750Ω
+V
A1
0.033µF
1/2
LT1018
+
–
1N4148
10k
–
LT1006
10k
10k
+V
1µF
+V
L1 = COILTRONICS CTX500-2-52
L2 = STANCOR P-8559
* = 1% FILM RESISTOR
= NTE5437
LT1004
1.2V
1963A TA03
Paralleling of Regulators for Higher Output Current
R1, 0.01Ω
LT1963A-3.3
3.3V
3A
C2
22µF
IN
OUT
+
+
C1
100µF
V
IN
> 3.7V
SHDN
GND
FB
R2
0.01Ω
LT1963A
IN
OUT
R6
6.65k
SHDN
GND
FB
SHDN
R7
4.12k
R3
2.2k
R4
2.2k
R5
1k
3
2
8
+
–
1
1/2
LT1366
C3
0.01µF
4
1963A TA05
1963aff
21
For more information www.linear.com/LT1963A
Linear [ Linear ]
