参数资料
| 型号： | LT1999MPS8-50#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/24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
19
1999fb
Typical applicaTions
Solenoid Current Monitor
The solenoid of Figure 7 consists of a coil of wire in an
iron case with permeable plunger that acts as a movable
element.WhentheMOSFETturnson,thediodeisreversed
biased off, and current flows through RSENSE to actuate
the solenoid. If the MOSFET is turned off, the current
in the MOSFET is interrupted, but the energy stored in
the solenoid causes the diode to turn on and current to
freewheel in the loop consisting of the diode, RSENSE and
the solenoid.
Figure 7 shows the LT1999 monitoring currents in a
ground referenced solenoid used when the coil is hard
tied to the case, and is tied to ground. Figure 8 shows a
supply referenced solenoid whose coil is insulated from
the case. The LT1999 will interface equally well to either
of these two configurations.
Bidirectional PWM Motor Monitor
Pulse width modulation is commonly used to efficiently
vary the average voltage applied across a DC motor. The
H-bridgetopologyofFigure9allowsfull4-quadrantcontrol:
clockwise control, counter-clockwise control, clockwise
regeneration, and counter-clockwise regeneration. The
LT1999 in conjunction with a non-inductive current shunt
is used to monitor currents in the rotor. The LT1999 can
be used to detect stuck rotors, provide detection of over-
current conditions in general, or provide current mode
feedback control.
Figure 10 shows a plot of the output voltage of the LT1999.
Figure 7. Solenoid Current Monitor for Ground Tied Solenoid. The Common Mode
Inputs to the LT1999 Switch Between VS and One Diode Drop Below Ground
LT1999
4k
0.8k
160k
2A
0.8k
4k
SHDN
V+
+
–
+
–
8
1
2
3
4
7
6
5
RG
V+
TIME (50ms/DIV)
V OUT
(0.5V/DIV)
V
+IN
(10V/DIV)
5V
VS
5V
1999 F07a
1999 F07b
0.1F
SOLENOID
RSENSE
V+IN
VSHDN
VOUT
VREF
V–IN
ON
OFF
VOUT
V+IN
SOLENOID PLUNGER PULLS IN
SOLENOID RELEASES
2.5V
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