参数资料
| 型号： | SC190CIMLTRT |
| 厂商： | Semtech |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.3A 10MLP |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调 |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 300mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-MLP（3x3） |
| 产品目录页面： | 1357 (CN2011-ZH PDF) |
| 其它名称： | SC190CIMLDKR |
SC190
POWER MANAGEMENT
Applications Information (Cont.)
Output Filter
The SC190 series of synchronous step-down converters
have internal loop compensation. The internal
compensation is designed to work with a certain output
?lter corner frequency de?ned by the equation:
Inductor Selection
As previously stated the value of the inductor should be in
the range 4.7μH to 10μH. The magnitude of the inductor
current ripple is dependant on the inductor value and can
be determined by the following equation:
Vo ? ? 1 ?
Vo ?
Vi ?
f c =
1
2 π L ? C
? IL =
?
L ? f
?
? IL
The internal compensation is optimized to operate with
an output ?lter, L=4.7μH & COUT = 10μF. When selecting
output ?lter components the LC product should not vary
over a wide range.
Table 1: Output Filter combinations
L(μH) C OUT (μF)
4.7 4.7
4.7 10
10 10
The selection of smaller inductor & capacitor values will
move the corner frequency, having an impact on system
stability. Due to this issue the practical lower limit for the
inductor value is 4.7μH.
Table 2 - Recommended Inductors
This equation demonstrates the relationship between
V IN ,V OUT & I L . The inductor ripple current decreases with
higher inductance & increases with higher V IN or V OUT .
To maximize ef?ciency the inductor should have a low
DCR to minimize the conduction losses. As a minimum
requirement the DC current rating of the inductor should
be equal to the maximum load current plus half of the
inductor current ripple and can be determined by the
following equation:
ILpk = Iout (max) +
2
Alternatively, set the inductor saturation current to be
greater than the switch current limit as a maximum
limit. I SAT > PMOS. Final inductor selection will depend
on various design considerations such as ef?ciency, EMI,
size and cost. Table 2 lists the manufacturers of practical
inductor options.
Manufacturer
TDK
Sumida
Taiyo Yuden
Coilcraft
Coilcraft
Part Number
LDR655312T-4R7W
CDRH3D16LD
LMNP04SB100M
LPS3015
LP06610-103M
Value
(μH)
4.7
4.7
10
10
10
DCR (?)
0.206
0.073
0.066
0.044
0.41
Rated
Current (A)
0.9
0.68
0.9
-
-
Saturation
Current (A)
-
-
-
0.65
0.8
Tolerance
%
20
30
20
20
20
Dimensions
(LxWxH mm)
6.5 x 5.3 x 1.2
4 x 4 x 1.8
5 x 5 x 2
3 x 3 x 1.5
6.9 x 3.8 x 1.0
? 2005 Semtech Corp.
9
www.semtech.com
相关PDF资料 |
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| SC192IMLTRT | IC REG BUCK ADJ 0.7A 10MLPD |
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