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SC4540
Applications Information (continued)
Diode Selection
A Schottky diode with a reverse voltage of 60V and a
forward current rating of 1A should be used with this
device for optimum performance. The ST Microelectronics
STPS05602 is a recommended diode for this application.
PCB Layout Considerations
Poor layout can degrade the performance of the DC-DC
converter and can be a contributory factor in EMI prob-
lems, ground bounce, thermal issues, and resistive voltage
losses. Poor regulation and instability can result. A typical
layout is shown in Figure 4.
Selection of Other Components
R ISET sets the maximum load current for the SC4540. Use
The following design rules are recommended:
the following equation to select the proper value:
R ISET = 230×V ISET /I LOAD
where
V ISET = 0.5V (typ).
Refer to Figure 1 for selecting values for other current set-
tings. Note that the error increases as the desired I BL
current decreases.
100
10
R IS E T
T yp ica l
C u rre n t
T o le ra n ce
?
?
?
Place the inductor and filter capacitors as close
to the device as possible and use short, wide
traces between the power components.
Route the output voltage feedback path away
from the inductor and LX node to minimize
noise and magnetic interference.
Use a ground plane to further reduce noise
interference on sensitive circuit nodes.
1
1
10
R IS E T (k Ω )
100
Figure 1 – Set Resistor Value Selection Graph
Figure 4– Layout
12
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