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参数资料
| 型号： | LSP3128SAD |
| 厂商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 5/10页 |
| 文件大小： | 342K |
| 代理商： | LSP3128SAD |
Liteon Semiconductor Corporation
LSP3128
Wide Input 3A Step Down Converter
Rev1.0
4/10
TYPICAL APPLICATION CIRCUIT
APPLICATION INFORMATION
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 output voltage:
Figure 1 Output Voltage Setting
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 ripple current requirement.
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 = between 20% and 30% to correspond to
the peak-to-peak ripple current being a percentage of the maximum output current. With this inductor value (Table 1),
the peak inductor current is IOUT (1 + KRIPPLE / 2). Make sure that this peak inductor current is less that the 5A
current limit. Finally, select the inductor core size so that it does not saturate at 5A.
VOUT
1.5V
1.8V
2.5V
3.3V
5V
L
6.8 H6.8 H6.8 H8.5 H15 H
Table 1: Typical Inductor Values
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