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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： | 3/24页 |
| 文件大小： | 337K |
| 代理商： | LT2940CDD#PBF |
LT2940
11
2940f
Table 1. LT2940 Essential Operating Parameters to Achieve Specied Accuracy (VCC Operating Range = 6V to 80V)
PARA-
METER
SENSE
INPUT
PINS
PIN VOLTAGE
LIMIT
INPUT
OPERATING
RANGE
SCALING
TO
OUTPUT
MONITOR
OUTPUT
PINS
OUTPUT
OPERATING
RANGE
OUTPUT
VOLTAGE COMPLIANCE
Voltage
V+, V–
0V to VCC – 3V at VCC ≤ 12V
0V TO 9V at 12V < VCC < 30V
0V to 18V at VCC ≥ 30V
VV = ±8V
-
Current
I+, I–
4V to 80V*
VI = ±200mV
GIMON =
1000μA /V
IMON
IIMON =
±200μA
Sourcing:
0V to VCC – 4.5V at VCC ≤ 7.5V
0V to 7.5V at 12V < VCC < 30V
0V to 12V at VCC ≥ 30V
Sinking:
As Above, Except Minimum is 0.5V
Power
V+, V–,
I+, I–
See Above Limits
VV VI = ±0.4V2
KPMON =
500μA / V2
PMON
IPMON =
±200μA
* The current sense range is completely independent of the supply voltage.
APPLICATIONS INFORMATION
PMON and IMON outputs are capable of indicating forward
and reverse ow of power and current, provided they are
advantageously biased.
The multiplier core full-scale product of ±0.4V2 may
be reached over a range of voltage and current inputs,
as shown in Figure 2. For example, voltage sense and
current sense combinations of 8V and 50mV, 4V and
100mV, and 2V and 200mV each multiply to 0.4V2, and
thus produce 200μA at PMON. This arrangement allows
the core to operate at full-scale, and therefore at best ac-
curacy, over a 4:1 range of current and voltage, a readily
appreciated feature when monitoring power in variable
supply applications.
Essential Design Equations
A few equations are needed to calculate input scaling factors
and achieve a desired output. Consider the basic applica-
tion in Figure 3, where the power PIN is to be measured
as the product of voltage VIN and current IIN:
PIN = VIN IIN
(6)
The actual measured quantities VIN and IIN are scaled to be
level-compatible with the LT2940. In this basic application,
a simple resistive voltage divider scales VIN, and a sense
resistor scales IIN.
VV = VIN kV
(7a)
k
R
RR
V =
+
1
12
(7b)
VI = IIN kI
(8a)
kI = RSENSE
(8b)
The PMON output current is given by:
IPMON = KPMON VIN kV IIN kI
(9a)
or
IPMON = PIN KPMON kV kI
(9b)
The output current may be positive (sourcing) or
negative (sinking) depending on the signs of VIN, kV,
IIN, and kI. Provided that the magnitudes of VV and VI
do not exceed 8V and 200mV as shown in Figure 2, at
Figure 2. PMON Output Current as a Function
of Sense Input Voltages
2940 F02
VV = VV+ – VV– (V)
V
I=
V
I+
–
V
I–
(mV)
100
1
4
25
50
12.5
200
0.5
2
8
IPMON
= 200μA
25μA
50μA
100μA
12.5μA
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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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