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參數(shù)資料
| 型號： | SC4540ULTRT |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 920 kHz SWITCHING FREQ-MAX, DSO8 |
| 封裝： | 2 X 2 MM, ROHS COMPLIANT, MLPD-8 |
| 文件頁數(shù)： | 4/15頁 |
| 文件大?。?/td> | 281K |
| 代理商： | SC4540ULTRT |
12
Applications Information (continued)
SC4540
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.
Selection of Other Components
R
ISET
sets the maximum load current for the SC4540. Use
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.
1
10
100
1
10
100
RISET (kΩ )
RISET
Typical
C urrent
T olerance
I BL
(m
A
)
Figure 1 – Set Resistor Value Selection Graph
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.
The following design rules are recommended:
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.
Figure 4– Layout
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