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LT3479 датащи(PDF) 10 Page - Linear Technology

номер детали LT3479
подробное описание детали  3A, Full Featured DC/DC Converter with Soft-Start and Inrush Current Protection
PDF  20 Pages
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производитель  LINER [Linear Technology]
домашняя страница  http://www.linear.com
Logo LINER - Linear Technology

LT3479 датащи(HTML) 10 Page - Linear Technology

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LT3479
10
3479fb
APPLICATIONS INFORMATION
GND
GND
SS
VC
FBN
FBP
VREF
SW
SW
L
VS
VIN
RT
SHDN
LT3479
RT
R2
CSS
RC
R1
CC
COUT
D
CIN
CS
L1
MINIMIZE THE AREA
OF THIS TRACE
TO VS
TO VIN
TO GND
TO SHDN
3479 F04
PLACE VIAS AROUND EXPOSED PAD
TO ENHANCE THERMAL PERFORMANCE
TO VOUT
Figure 4. Suggested Board Layout
Switching Frequency
The switching frequency of the LT3479 is set by an exter-
nal resistor attached to the RT pin. Do not leave this pin
open. A resistor must always be connected for proper
operation. See Table 4 and Figure 7 for resistor values
and corresponding frequencies.
Table 4. Switching Frequency
SWITCHING FREQUENCY (MHz)
RT (kΩ)
3.5
1.78
3
2.87
2.5
4.32
2
6.49
1.5
10.2
1
17.8
0.5
39.2
0.2
113
Figure 5. Start-Up with No Soft-Start Capacitor
0.2MS/DIV
IL
2A/DIV
VOUT
5V/DIV
3479 F05
Figure 6. Start-Up with CSS = 22nF
0.2ms/DIV
IL
2A/DIV
VOUT
5V/DIV
3479 F06



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