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参数资料
| 型号： | LT2940CDD#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, DFN-12 |
| 文件页数： | 4/24页 |
| 文件大小： | 337K |
| 代理商： | LT2940CDD#PBF |
LT2940
12
2940f
APPLICATIONS INFORMATION
the full-scale output current of ±200μA, the achievable
full-scale power is:
P
V
kk
IN FS
VI
()
.
=
04 2
(10)
In some applications the PMON output is converted to a
voltage by a load resistor:
VPMON = IPMON RPMON
(11)
The complete end-to-end scaling is then given by:
VPMON = PIN KPMON kV kI RPMON
(12)
The current monitor output current at IMON is found by
combining Equations 4 and 8a:
IIMON = IIN GIMON kI
(13)
The output current may be positive (sourcing) or negative
(sinking) depending on the signs of IIN and kI. Provided
that the magnitude of VI does not exceed 200mV, at the
full-scale output current of ±200μA the achievable full-
scale input current is:
I
V
k
IN FS
I
()
.
=
02
(14)
If IMON current is converted to a voltage by a load resis-
tor, then:
VIMON = IIMON RIMON
(15)
and the nal end-to-end scaling is given by:
VIMON = IIN GIMON kI RIMON
(16)
Accuracy
The principal accuracies of the power and current monitor
outputs are characterized as absolute percentages of full-
scale output currents, using the nominal values of scaling
parameters. The total error of the IPMON output, EPMON, is
typically ±2%, and is dened as:
E
I
A
V
VV
A
PMON
V
I
=
500
200
100
2
(
)
%
(17)
Contributors to the power output accuracy such as the scal-
ing (KPMON), the output offset (IPMON(OS)), and the voltage
and current sense input offsets (VV(OSP) and VI(OSP)), are
separately specied at key conditions and may be totaled
using the root sum-of-squares (RSS) method.
The total error of the IIMON output, EIMON, is typically
±1.5%, and is dened as:
E
I
A
V
A
IMON
I
=
1000
200
100
μ
%
(18)
Contributors to the current output accuracy such as the
scaling (GIMON) and the current sense input offset (VI(OSI))
are separately specied at key conditions. Here again, use
the RSS method of totaling errors.
Figure 3. Basic Power Sensing Application Showing Derivation of kV and kI
LT2940
PIN = VIN IIN
2940 F03
7
8
11 10
PMON
R1
LOAD
V +
V –
I +
I –
4
IMON
5
kV =
VI = IIN RSENSE
kI = RSENSE
VV = VIN
R1 + R2
R1
R1 + R2
R1
VIN
R2
RSENSE
IIN
RIMON
VIMON
IIMON
RPMON
VPMON
IPMON
+
–
+
–
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相关代理商/技术参数 |
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|---|---|
| LT2940CMS | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power and Current Monitor |
| LT2940CMS#PBF | 功能描述:IC CURRENT/POWER MONITOR 12MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LT2940CMS#PBF | 制造商:Linear Technology 功能描述:IC POWER AND CURRENT MONITOR MSOP-12 |
| LT2940CMS#TRPBF | 功能描述:IC POWER/CURRENT MONITOR 12MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LT2940CMSPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power and Current Monitor |
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