參數(shù)資料
型號(hào)： LT6109IMS-1#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO10
封裝： LEAD FREE, PLASTIC, MSOP-10
文件頁(yè)數(shù)： 7/28頁(yè)
文件大?。?/td> 370K
代理商： LT6109IMS-1#PBF
LT6109-1/LT6109-2
15
610912f
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 previously in the Output
Voltage Error,
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.
Neglecting VOS, the output circuit is not limited by satura-
tion 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)
2.9V
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 = –350V
VOS = 350V
G = 100
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