参数资料
型号: LT6109IMS-1#PBF
厂商: Linear Technology
文件页数: 7/28页
文件大小: 0K
描述: IC AMP CURRENT SENSE 10MSOP
标准包装: 50
类型: 放大器,比较器,参考
应用: 电流感测,电源管理
安装类型: 表面贴装
封装/外壳: 10-TFSOP,10-MSOP(0.118",3.00mm 宽)
供应商设备封装: 10-MSOP
包装: 管件
LT6109-1/LT6109-2
15
610912fa
above the positive supply to 33V below it. These operat-
ing voltages are limited by internal diode clamps shown
in Figures 1 and 2. On supplies less than 35.5V, the lower
range is limited by V+ 2.5V. This allows the monitored
supply, VBATT, to be separate from the LT6109 positive
supply as shown in Figure 7. Figure 8 shows the range of
operating voltages for the SENSELO and SENSEHI inputs,
for different supply voltage inputs (V+). The SENSELO and
SENSEHI range has been designed to allow the LT6109 to
monitor its own supply current (in addition to the load),
as long as VSENSE is less than 200mV. This is shown in
Figure 9.
Minimum Output Voltage
The output of the LT6109 current sense amplifier can
produce a non-zero output voltage when the sense voltage
is zero. This is a result of the sense amplifier VOS being
forced across RIN as discussed in the Output Voltage Er-
ror,
VOUT(VOS) section. Figure 10 shows the effect of the
input offset voltage on the transfer function for parts at
the VOS limits. With a negative offset voltage, zero input
sense voltage produces an output voltage. With a positive
offset voltage, the output voltage is zero until the input
sense voltage exceeds the input offset voltage. Neglect-
ing VOS, the output circuit is not limited by saturation of
pull-down circuitry and can reach 0V.
Response Time
The LT6109 amplifier is designed to exhibit fast response
to inputs for the purpose of circuit protection or current
monitoring. This response time will be affected by the
external components in two ways, delay and speed.
APPLICATIONS INFORMATION
Figure 9. LT6109 Supply Current Monitored with Load
Figure 7. V+ Powered Separately from Load Supply (VBATT)
Figure 8. Allowable SENSELO, SENSEHI Voltage Range
SENSEHI
LT6109
ISENSE
RSENSE
V+
9
V
5
V+
RIN
VBATT
SENSELO
10
1
OUTA 8
610912 F07
ROUT
VOUT
+
60
50
40
30
20
20.2V
40.2V
10
27
ALLOW
ABLE
OPERA
TING
VOL
TAGES
ON
SENSELO
AND
SENSEHI
INPUTS
(V)
2.8V
2.5V
2.7
10
20
30 35.5 40
50
V+ (V)
60
610912 F08
VALID SENSELO/
SENSEHI RANGE
SENSEHI
LT6109
ISENSE
RSENSE
V+
9
V
5
RIN
VBATT
SENSELO
10
1
OUTA 8
610912 F09
ROUT
VOUT
+
Figure 10. Amplifier Output Voltage vs Input Sense Voltage
INPUT SENSE VOLTAGE (V)
0
OUTPUT
VOLTAGE
(mV)
40
80
120
20
60
100
200
400
600
800
610912 F10
1000
100
0
300
500
700
900
VOS = –125V
VOS = 125V
G = 100
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