VOUT V
參數(shù)資料
型號: LT1999CMS8-20#PBF
廠商: Linear Technology
文件頁數(shù): 10/24頁
文件大?。?/td> 0K
描述: IC OP AMP CURRENT SENSE 8-MSOP
標準包裝: 50
放大器類型: 電流檢測
電路數(shù): 1
輸出類型: 帶緩沖
轉(zhuǎn)換速率: 3 V/µs
-3db帶寬: 2MHz
電流 - 輸入偏壓: 137.5µA
電壓 - 輸入偏移: 500µV
電流 - 電源: 5.8mA
電流 - 輸出 / 通道: 40mA
電壓 - 電源,單路/雙路(±): 4.5 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 8-MSOP
包裝: 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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