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LT1533CS Datasheet(PDF) 15 Page - Linear Technology

Part # LT1533CS
Description  Ultralow Noise 1A Switching Regulator
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1533CS Datasheet(HTML) 15 Page - Linear Technology

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LT1533
APPLICATIONS INFORMATION
The slew rate adjustment should be made by putting a
3.9k resistor in series with a 50k pot on the RVSL and RCSL
pins (or a 2k resistor in series with a 25k pot with both
pins tied together). Monitor output noise or other system
signal while increasing the resistance until desired noise
performance is reached. System efficiency can also be
monitored.
While this topology is not as quiet as a push-pull con-
verter, it can provide a low cost, isolated power supply that
has decreased noise relative to other solutions.
More Help
AN70 contains much information concerning LT1533
applications and measurement of noise and should be
consulted. A 5V to 12V demo board is also available
(DC173). AN19 and AN29 also have general knowledge
concerning switching regulators. Our Application Depart-
ment is always ready to lend a helping hand.
TYPICAL APPLICATIONS
Figure 6. 5V to
±12V DC Transformer
18k
10k
43k
LT1533
GND RT
VC NFB FB
5V
22
µF
10V
25nH*
T1**
L2
100
µH
L1
100
µH
68k
4k TO 68k
VIN
DUTY
SHDN
SYNC
1
1
3.3
3.3
1533 F06
3300pF
12V
80mA
–12V
80mA
1N5819
×4
LT1121CS8
LT1175CS8
22
µF
35V
22
µF
35V
R4
150k
150k
2.2
µF
25V
2.2
µF
25V
332k
324k
81
32
1, 2, 7, 8
3
4
5
14
2
16
15
12
13
7
5V
8
10
5
6
9
4
11
3
BAT85
BAT85
CT
SHDN
* BEAD OR PCB TRACE
** COILTRONICS CTX02 13716-X1
L1, L2: COILCRAFT DT1608C-104
COL A
PGND
RCSL
RVSL
COL B



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