参数资料
| 型号： | SC192IMLTRT |
| 厂商： | Semtech |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.7A 10MLPD |
| 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： | 0.75 V ~ 5.5 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 750kHz |
| 电流 - 输出： | 700mA |
| 同步整流器： | 无 |
| 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-MLPD（3x3） |
| 产品目录页面： | 1357 (CN2011-ZH PDF) |
| 其它名称： | SC192IMLDKR |
SC192
POWER MANAGEMENT
Applications Information Cont.
PSAVE, Cout = 4.7uF, Lout = 4.7uH
Inductor Selection
The inductor values listed in Table 1 will work for nearly
all combinations of output current and output voltages.
After selecting 4.7uH or 10uH for the inductor value two
additional inductor parameters should be considered. The
current rating of the inductor and the DC resistance.
The DC resistance has a great impact on efficiency due
to copper losses. However, small inductors tend to have
higher DC resistance. Therefore a compromise between
size and efficiency will need to be made.
The inductor current must be chosen to prevent the in-
ductor from saturation. The most conservative approach
would be to select an inductor with a saturation current
slightly above the maximum current capability of the
SC192 which is 1.56A peak current for ILIM = Vin or
780mA for ILIM = GND.
A more accurate design of the inductor would be to rate
the inductor for the maximum output current plus the
inductor ripple current that can be calculated as follows:
PWM, Cout = 4.7uF, Lout = 4.7uH
f = Switching frequency
L = Inductor Value
Δ I L = Peak-to-peak inductor ripple current
I L = Maximum inductor current
V OUT = Output voltage
V IN = Input voltage
C OUT = Output Capacitance
I OUT = Output Current
I OUT(MAX) = Maximum DC Output Current
Output Capacitor Selection
Because the SC192 has external compensation avail-
able, low ESR ceramic capacitors can be used. This elimi-
nates the need for bulky tantalum capacitors. Values for
the output capacitors in Table 1 will work for nearly all
combinations of output current and output voltages. The
equation for determining the size of the output capaci-
tor in terms of minimizing the ripple voltage is given as
Δ V O = Δ I L ? ?
+ ESR ?
I L(MAX) = I O(MAX ) +
Δ I L
2
follows:
? 1
? 8 ? C OUT ? f
?
?
? 1 -
?
? L ? f ?
?
?
? V OUT ?
Δ I L = ? V IN ? ? V OUT
? ?
Input Capacitor Selection
The input ripple current can be reduced with properly
selecting the input capacitor. Again, values for the input
capacitors in Table 1 will work for nearly all combina-
tions of input current and output voltages. The input ca-
pacitor should be rated for the maximum input ripple
current calculated as:
? 2007 Semtech Corp.
11
www.semtech.com
相关PDF资料 |
PDF描述 |
|---|---|
| SC194AMLTRT | IC REG BUCK ADJ 1A 10MLP |
| SC194BMLTRT | IC REG BUCK ADJ 1A 10MLP |
| SC195ULTRT | IC REG BUCK SYNC ADJ 0.5A 8MLPQ |
| SC196AMLTRT | IC REG BUCK SYNC 1.5A 10MLP |
| SC196ULTRT | IC REG BUCK SYNC ADJ 1.5A 10MLPD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SC194A | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1A Synchronous Buck Converter with Integrated Power Devices |
| SC194AEVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1A Synchronous Buck Converter with Integrated Power Devices |
| SC194AML.TRT | 制造商:Semtech Corporation 功能描述: |
| SC194AMLTRT | 功能描述:IC REG BUCK ADJ 1A 10MLP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:50 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:5 V ~ 25 V 输入电压:2.3 V ~ 5.5 V PWM 型:电流模式 频率 - 开关:600kHz，1.2MHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 包装:管件 供应商设备封装:8-MSOP |
| SC194B | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Selectable 3.6V/3.3V/3.0V/2.5V 1A Synchronous Buck Converter |
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