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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： | 7/24页 |
| 文件大小： | 337K |
| 代理商： | LT2940CDD#PBF |
LT2940
15
2940f
APPLICATIONS INFORMATION
Figure 7. Supply Resistor Reduces Package Heating by Reducing VCC Voltage
When the LATCH pin voltage exceeds 2.5V, the next high
result from the comparator also enables the comparator
latch. The CMPOUT pin goes open (high), and the CMPOUT
pin sinks current (low) regardless of the changes to the
CMP+ level until the latch is cleared. Latch activation is
level sensitive, not edge sensitive, so if CMP+ > 1.24V
when LATCH is brought above 2.5V, the comparator result
is high, and the latch is set immediately. The LATCH pin
voltage may be taken safely to 80V regardless of the VCC
pin voltage.
The latch is released and the comparator reports a low
when LATCH ≤ 0.5V or when VCC < 2.3V regardless of the
CMP+ pin voltage. In this state, the CMPOUT pin sinks
current (low), while the CMPOUT pin goes open (high).
As with latching, clearing is level-sensitive: comparator
outputs react to the input signal as soon as LATCH ≥ 1.25V
and VCC > 2.7V.
Thermal Considerations
If operating at high supply voltages, do not ignore package
dissipation. At 80V the dissipation could reach 400mW;
more if IMON or PMON current exceeds full-scale. Pack-
age thermal resistance is shown in the Pin Conguration
section. Package dissipation can be reduced by simply
adding a dropping resistor in series with the VCC pin, as
shown in Figure 7. The operating range of the current sense
input pins I+ and I–, which extends to 80V independent
of VCC, make this possible. The voltage ranges of the V+,
V–, PMON and IMON pins are, however, limited by VCC.
Consult Table 1 during design. Operating an open-col-
lector output pin with simultaneously large current and
large voltage bias also contributes to package heating and
must be avoided.
CMP+
PMON
IMON
CMPOUT
LATCH
V–
V+
I–
I+
2940 F07
VCC
R2
140k
LOAD
R1
10.0k
5mA
MAX
0A TO 1.3A
100V MAX
VPMON
R4
13.7k
R3
6.19k
OVP
30V TO 80V
OVERPOWER (OVP) GOES HIGH
WHEN LOAD POWER > 40W
RS
LT2940
GND
R12
3.9k
10% 1/8W
150mΩ
1/2W
36V MAX
R14
20k
SCALE = 10
40W FULL-SCALE
W
V
kV =
kI = 150mΩ
1
15
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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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