LT1533C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1533C' PDF : 20 Pages View PDF
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
SHDN
5V
14
VIN
2
COL A
16
PGND
22µF
10V
25nH*
BAT85
T1**
1
3.3
1N5819
×4
L1
100µH
8
1
LT1121CS8
3
22µF
35V
2 332k
R4
150k
3 DUTY
11
SHDN
4
SYNC
GND RT
96
LT1533
15
COL B
12 68k
RCSL
13
RVSL
CT VC NFB FB
4k TO 68k
5 10 8 7 43k
3300pF
5V
18k
10k
BAT85 1
3.3
22µF
150k 324k
35V
L2
54
100µH
3
LT1175CS8
1, 2, 7, 8
* BEAD OR PCB TRACE
** COILTRONICS CTX02 13716-X1
L1, L2: COILCRAFT DT1608C-104
12V
80mA
2.2µF
25V
2.2µF
25V
–12V
80mA
1533 F06
Figure 6. 5V to ±12V DC Transformer
15
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