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SC4539
Applications Information (continued)
Diode Selection
For optimum performance, it is recommended that a
Schottky diode with a reverse voltage of 40V and a forward
current rating of 1A like the Central Semiconductor
Corporation CMOSH-4E be used. Diodes with lower
voltage ratings can be used, but performance should be
compared to the performance with this 40V part to ensure
stable operation is maintained.
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 2.
The following design rules are recommended:
Selection of Other Components
R ISET sets the maximum load current for the SC4539. Use
the following equation to select the proper value:
R ISET = 230 × V ISET /I LOAD
where
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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.
V ISET = 0.5V (typ).
Refer to Figure 1 for selecting values for other current set-
tings. Notice that the error increases as the desired I BL
current decreases.
100
10
R ISET
Typical
Current
Tolerance
1
1
10
R ISET (k Ω )
100
Figure 1 – Set Resistor Value Selection Graph
Figure 2– Layout
12
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