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| 型号： | LSP5502SAC |
| 厂商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 470 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 6/11页 |
| 文件大小： | 275K |
| 代理商： | LSP5502SAC |
LSP5502
2A Synchronous Step Down DC/DC Converter
4/11
Rev. 1.7
www.liteon-semi.com
APPLICATION INFORMATION
Output Voltage Setting
Figure1. Output Voltage Setting
Figure 1 shows the connections for setting the output voltage. Select the proper ratio of the two feedback resistors
RFB1 and RFB2 based on the output voltage. Typically, use RFB2 ≈ 10k and determine RFB1 from the following
equation:
(1)
Table 1-Recommended Resistance Values
VOUT
RFB1
RFB2
1.0V
1.0k
12k
1.2V
3.0k
10k
1.8V
9.53k
10k
2.5V
16.9k
10k
3.3V
26.1k
10k
5V
44.2k
10k
12V
121k
10k
Inductor Selection
The inductor maintains a continuous current to the output load. This inductor current has a ripple that is dependent
on the inductance value: higher inductance reduces the peak-to-peak ripple current. The trade off for high
inductance value is the increase in inductor core size and series resistance, and the reduction in current handling
capability. In general, select an inductance value L based on the ripple current requirement:
RIPPLE
OUTMAX
SW
IN
OUT
IN
OUT
K
I
f
V
)
V
(
V
L
=
(2)
where VIN is the input voltage, VOUT is the output voltage, fSW is the switching frequency, IOUTMAX is the maximum
output current, and KRIPPLE is the ripple factor. Typically, choose KRIPPLE = 30% to correspond to the peak-to-peak
ripple current being 30% of the maximum output current.
With this inductor value, the peak inductor current is IOUT (1 + KRIPPLE / 2). Make sure that this peak inductor current
is less that the 3A current limit. Finally, select the inductor core size so that it does not saturate at 3A. Typical
inductor values for various output voltages are shown in Table 1.
VOUT 1.0V 1.2V 1.5V 1.8V 2.5V 3.3V
5V
L
4.7uH 4.7uH 6.8H6.8H 10H 10H 15H
Table 1. Typical Inductor Values
Input Capacitor
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