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参数资料
| 型号： | LSP3112LAD |
| 厂商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO10 |
| 封装： | 3 X 3 MM, PLASTIC, DFN-10 |
| 文件页数： | 9/11页 |
| 文件大小： | 396K |
| 代理商： | LSP3112LAD |
Liteon Semiconductor Corporation
LSP3112
Dual Channel 1.5 MHZ, 600mA Synchronous Step-Down Converter
Rev1.1
7/11
APPLICATION INFORMATION
Fig.1 LSP3112 Typical Application Circuit
SETTING THE OUTPUT VOLTAGE
The external resistor sets the output voltage according to the following equation:
OUT
R2
V0.6V 1+
R1
=
Table 1 ----Resistor select for output voltage setting
VOUT
R1(R3)
R2(R4)
1.2V
316K
1.5V
316K
474K
1.8V
316K
634K
2.5V
316K
1001K
INDUCTOR SELECTION
For most designs, the LSP3112 operates with inductors of 1H to 4.7H. Low inductance values are physically
smaller but require faster switching, which results in some efficiency loss. The inductor value can be derived from
the following equation:
()
OUT
IN
OUT
IN
L
OSC
VV
V
L
VI
f
×
=
× ×
Where IL is inductor Ripple Current. Large value inductors lower ripple current and small value inductors result in
high ripple currents. Choose inductor ripple current approximately 35% of the maximum load current 600mA, or
IL=210mA.
For output voltages above 2.0V, when light-load efficiency is important, the minimum recommended inductor is
2.2H. For optimum voltage-positioning load transients, choose an inductor with DC series resistance in the 50m
to 150m range. For higher efficiency at heavy loads (above 200mA), or minimal load regulation (but some transient
overshoot), the resistance should be kept below 100m. The DC current rating of the inductor should be at least
equal to the maximum load current plus half the ripple current to prevent core saturation (600mA+105mA). Table2
lists some typical surface mount inductors that meet target applications for the LSP3112.
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