参数资料
| 型号： | LT1999MPS8-50#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC AMP CURR SENSE HV 8-MSOP |
| 标准包装： | 100 |
| 放大器类型： | 电流检测 |
| 电路数： | 1 |
| 输出类型： | 带缓冲 |
| 转换速率： | 3 V/µs |
| -3db带宽： | 1.2MHz |
| 电流 - 输入偏压： | 137.5µA |
| 电压 - 输入偏移： | 500µV |
| 电流 - 电源： | 5.8mA |
| 电流 - 输出 / 通道： | 40mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 5.5 V |
| 工作温度： | -55°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 管件 |
LT1999-10/LT1999-20/
LT1999-50
18
1999fb
applicaTions inForMaTion
VOUT
VREF
VSHDN
LT1999
4k
0.8k
160k
2A
0.8k
4k
SHDN
V+
+
–
+
–
8
1
2
3
4
7
6
5
RG
V+
VS
5V
1999 F05
0.1F
FUSE
STEERING
DIODE
LOAD
ILOAD
RSENSE
OFF
ON
5V
VOUT
V+IN
V–IN
VREF
VSHDN
Figure 5. Using the LT1999 to Monitor a Fuse
Fuse Monitor
The inputs can be overdriven without fear of damaging
the LT1999. This makes the LT1999 ideal for monitoring
fuses if either +IN or –IN are shorted to ground while the
other is at the full common mode supply voltage (see
Figure 5). If the fuse in Figure 5 opens with the +IN tied
to the positive supply, the load will pull –IN to GND. The
output will be forced to the positive V+ supply rail. If it is
desired that the output be near ground if the fuse opens,
it is a simple matter of swapping the inputs. Precautions
should be followed: First, when the inputs are stressed
differentially due to the fuse blowing open, a large voltage
drop will be placed across the +IN to –IN pins, dissipating
power in the precision on-chip input resistors. Precaution
should be taken to prevent junction temperatures from
exceedingtheAbsoluteMaximumratings(seeNote3inthe
Electrical Characteristics section). Secondly, if the load is
inductive, and the fuse blows open without a clamp diode,
energy stored in the inductive load will be dissipated in
the LT1999, which could cause damage. A simple steering
diode as shown in Figure 5 will prevent this from happen-
ing, and will protect the LT1999 from damage.
Finally, the user should be aware that in fuse monitoring
applications with the sense voltage (VSENSE = V+IN – V–IN)
being driven in excess of –25V, the output of the LT1999
will undergo phase reversal (see Figure 6).
Figure 6. A Plot of the LT1999’s Output Voltage vs VSENSE (VSENSE = V+IN – V–IN).
In Applications Where the Sense Voltage Is Driven in Excess of –25V, the Output
of the LT1999 Will Undergo Phase Reversal
VSENSE (V)
–60
V OUT
(1V
/DIV)
–30
–45
–15
30
1999 F06
60
15
45
0
VOUT PHASE REVERSAL FOR VSENSE < –25V
VREF = 2.5V
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