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參數資料
| 型號： | LT2940IMS#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-12 |
| 文件頁數： | 1/24頁 |
| 文件大小： | 337K |
| 代理商： | LT2940IMS#PBF |
LT2940
1
2940f
TYPICAL APPLICATION
DESCRIPTION
Power and Current Monitor
The LT2940 measures a high side current and a differ-
ential voltage, multiplies them and outputs a current
proportional to instantaneous power. Bidirectional high
side currents and bipolar voltage differences are correctly
handled by the four-quadrant multiplier and push-pull
output stage, which allows the LT2940 to indicate forward
and reverse power ow.
An integrated comparator with inverting and noninvert-
ing open-collector outputs makes the LT2940 a complete
power level monitor. In addition, an output current pro-
portional to the sensed high side current allows current
monitoring. The current mode outputs make scaling,
ltering and time integration as simple as selecting ex-
ternal resistors and/or capacitors.
Load Monitor Alarms Above 60W
FEATURES
APPLICATIONS
n
Four-Quadrant Power Measurement
n
±5% Power Measurement Accuracy
n
4V to 80V High Side Sense, 100V Max
n
Current Mode Power and Current Outputs
n
Output Bandwidth Exceeds 500kHz
n
±3% Current Measurement Accuracy
n
6V to 80V Supply Range, 100V Max
n
Inverting and Noninverting Open-Collector
Comparator Outputs
n
Available in 12-Pin DFN (3mm
× 3mm) and 12-Lead
MSOP Packages
n
Board Level Power and Current Monitoring
n
Line Card and Server Power Monitoring
n
Power Sense Circuit Breaker
n
Power Control Loops
n
Power/Energy Meters
n
Battery Charger Metering
CMP+
PMON
IMON
CMPOUT
LATCH
V–
V+
I–
I+
2940 TA01a
VCC
110k
+
–
10.0k
0A TO 10A
LED ON WHEN
PLOAD > 60W
PLOAD = VLOAD ILOAD
VLOAD
6V TO 80V
ILOAD
LT2940
GND
20mΩ
2W
5V
1k
VIMON = ILOAD 100
mV
A
VPMON = PLOAD 20.75
mV
W
24.9K
4.99k
LOAD
kV =
kI = 20mΩ
1
12
ILOAD (A)
P
LOAD
(W)
0
V
PMON
(V)
2.0
1.5
1.0
4
8
2
6
10
12
14
0.5
0
2.5
96
72
48
24
0
120
80V
30V
15V
10V
2940 TA01b
LED ON
LED OFF
VLOAD =6V
60W ALARM
Monitor Output Level and Load Power
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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