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LT1932
APPLICATIO S I FOR ATIO
V IN
I IN
L1
6.8 μ H
D1
V OUT
C1
4.7 μ F
6
V IN
1
SW
Q1
2N3904
C3
0.047 μ F
5
LT1932
SHDN
LED
3
R1
C2
1 μ F
R SET
4
R SET
1.50k
GND
2
1.5k
SOFT-START
1932 F07
CIRCUIT
Figure 7. Soft-Start Circuit for the LT1932
V OUT
5V/DIV
I IN
200mA/DIV
V OUT
5V/DIV
I IN
200mA/DIV
100 μ s/DIV
1932 F08
100 μ s/DIV
1932 F09
Figure 8. Input Current at Start-Up Without Soft-Start
Board Layout Considerations
Figure 9. Input Current at Start-Up with Soft-Start
As with all switching regulators, careful attention must be
paid to the PCB board layout and component placement.
D1
L1
C1
To maximize efficiency, switch rise and fall times are made
as short as possible. To prevent radiation and high fre-
quency resonance problems, proper layout of the high
frequency switching path is essential. Minimize the length
and area of all traces connected to the SW pin and always
C2
GND
1
2
3
6
5
4
V IN
SHDN
use a ground plane under the switching regulator to
R SET
minimize interplane coupling. The signal path including
the switch, output diode D1 and output capacitor C2,
1932 F10
DIMMING
CONTROL
contains nanosecond rise and fall times and should be
kept as short as possible. In addition, the ground connec-
Figure 10. Recommended Component Placement
tion for the R SET resistor should be tied directly to the GND
pin and not be shared with any other component, ensuring
a clean, noise-free connection. Recommended compo-
nent placement is shown in Figure 10.
1932f
9
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