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參數(shù)資料
| 型號： | LT6109IMS-2#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 4/28頁 |
| 文件大小： | 0K |
| 描述： | IC AMP CURRENT SENSE 10MSOP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 類型： | 放大器，比較器，參考 |
| 應(yīng)用： | 電流感測，電源管理 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 管件 |
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LT6109-1/LT6109-2
12
610912fa
APPLICATIONS INFORMATION
Selection of External Input Gain Resistor, RIN
RIN should be chosen to allow the required speed and
resolution while limiting the output current to 1mA. The
maximum value for RIN is 1k to maintain good loop sta-
bility. For a given VSENSE, larger values of RIN will lower
power dissipation in the LT6109 due to the reduction
in IOUT while smaller values of RIN will result in faster
response time due to the increase in IOUT. If low sense
currents must be resolved accurately in a system that has
a very wide dynamic range, a smaller RIN may be used
if the maximum IOUTA current is limited in another way,
such as with a Schottky diode across RSENSE (Figure 4).
This will reduce the high current measurement accuracy
by limiting the result, while increasing the low current
measurement resolution.
This approach can be helpful in cases where occasional
bursts of high currents can be ignored.
Care should be taken when designing the board layout for
RIN, especially for small RIN values. All trace and inter-
connect resistances will increase the effective RIN value,
causing a gain error.
The power dissipated in the sense resistor can create a
thermal gradient across a printed circuit board and con-
sequently a gain error if RIN and ROUT are placed such
that they operate at different temperatures. If significant
power is being dissipated in the sense resistor then care
Figure 3. LT6109-1 Typical Connection
OUTA
IOUTA
–
+
–
+
V+
C1
SENSEHI
INC2
INC1
5
4
3
2
1
R1*
610912 F03
V–
V+
V–
LT6109-1
SENSELO
EN/RST
OUTC2
VRESET
RC
VPULLUP
LOAD
VSUPPLY
VSENSE
RSENSE
UNDERCURRENT
FLAG
OVERCURRENT
FLAG
RIN
+
–
OUTC1
*ROUT = R1 + R2 + R3
–
+
V–
V+
ISENSE =
VSENSE
RSENSE
RC
R2*
6
7
8
9
10
R3*
CL
VOUT
400mV
REFERENCE
CLC
DSENSE
RSENSE
V+
LOAD
610912 F04
Figure 4. Shunt Diode Limits Maximum Input Voltage to Allow
Better Low Input Resolution Without Overranging
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