LT1533C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1533C' PDF : 20 Pages View PDF
TYPICAL APPLICATIONS
Hysteretic Loop Lowers Quiescent Current to 100µA While
Maintaining Low Output Noise. See AN70 for Details
2.7V TO 4V
+
(3 Ni-Cd BATTERIES)
14
1N4148
T1
L1
100µH 12V
( ) L3 OPTIONAL FOR
100µH LOWEST RIPPLE
4.7µF
11
VIN
2
SHDN
COL A
3 DUTY
15
+
1N4148
47µF
+
47µF
3300pF 4 SYNC
COL B
L2
5 CT
16
PGND
18k
6 RT
LT1533
13 15k
RVSL
12 15k
RCSL
5V
C1
LTC1440
21.5k
1%
2.32k
1%
10
7
VC GND
FB
NFB
0.01µF
9
8
150k
10pF
1.18V
L1, L3: COILTRONICS CTX100-3
VZ INTERNAL
TO LTC1440
L2: 22nH TRACE INDUCTANCE, FERRITE BEAD OR
INDUCTOR COILCRAFT B-07T TYPICAL
T1: CTX02-13665-X1
1553 TA05
LT1533
10k
Q3
1N4148
+
1N752
5.6V
1µF
A 50V Output Low Noise Regulator. Cascoded Bipolar Transistors
Accommodate 60V Transformer Swings, Permitting 24V (20VIN to 30VIN)
Powered Operation. See AN70 for Details
24V
(20V TO 30V)
68Ω 0.003µF
360Ω
3.3k
14
11 SHDN
VIN
2
COL A
3300pF
18k
3
DUTY
15
4 SYNC
COL B
L2
5 CT
16
PGND
LT1533
13 15k
6 RT
RVSL
12 15k
RCSL
10
VC
0.01µF
GND
9
7
NFB FB
8
2.49k
1%
Q1
T1
+
47µF
MUR110
MUR110
L1
100µH
50V
( ) OPTIONAL FOR
100µH LOWEST RIPPLE
+
47µF
+
47µF
Q2
3.3k
360Ω 68Ω
0.003µF
97.6k
1%
1553 TA06
L1: COILTRONICS CTX100-3
L2: 22nH TRACE INDUCTANCE, FERRITE BEAD OR
INDUCTOR COILCRAFT B-07T TYPICAL
Q1, Q2: ZETEX ZTX-853
Q3: 2N2222A
T1: CTX02-13665-X1
17
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