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參數(shù)資料
| 型號： | LT6109IMS-1#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號調理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO10 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 6/28頁 |
| 文件大小： | 370K |
| 代理商： | LT6109IMS-1#PBF |
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LT6109-1/LT6109-2
14
610912f
APPLICATIONS INFORMATION
There is also power dissipated due to the quiescent power
supply current:
PS = IS V+
The comparator output current flows into the comparator
output pin and out of the V– pin. The power dissipated in
the LT6109 due to each comparator is often insignificant
and can be calculated as follows:
POUTC1,C2 = (VOUTC1,C2 – V–) IOUTC1,C2
The total power dissipated is the sum of these
dissipations:
PTOTAL = POUTA + POUTC1 + POUTC2 + PS
At maximum supply and maximum output currents, the
total power dissipation can exceed 100mW. This will cause
significant heating of the LT6109 die. In order to prevent
damage to the LT6109, the maximum expected dissipa-
tion in each application should be calculated. This number
can be multiplied by the
θJA value, 160°C/W, to find the
maximum expected die temperature. Proper heat sinking
and thermal relief should be used to ensure that the die
temperature does not become excessive.
Output Filtering
The AC output voltage, VOUT, is simply IOUTA ZOUT. This
makes filtering straightforward. Any circuit may be used
which generates the required ZOUT to get the desired filter
response. For example, a capacitor in parallel with ROUT
will give a lowpass response. This will reduce unwanted
noise from the output, and may also be useful as a charge
reservoir to keep the output steady while driving a switch-
ing circuit such as a MUX or ADC. This output capacitor
in parallel with ROUT will create an output pole at:
f–3dB =
1
2
π ROUT CL
SENSELO, SENSEHI Range
The difference between VBATT (see Figure 7) and V+, as
well as the maximum value of VSENSE, must be considered
to ensure that the SENSELO pin doesn’t exceed the range
listed in the Electrical Characteristics table. The SENSELO
and SENSEHI pins of the LT6109 can function from 0.2V
Figure 6. Gain Error vs Resistor Tolerance
SENSEHI
LT6109
ISENSE
RSENSE
V+
9
V–
5
V+
RIN
VBATT
SENSELO
10
1
OUTA 8
610912 F05
ROUT
VOUT
RIN+
–
+
Figure 5. RIN+ Reduces Error Due to IB
Output Voltage Error,
VOUT(GAIN ERROR), Due to
External Resistors
The LT6109 exhibits a very low gain error. As a result, the
gain error is determined primarily by the accuracy of the
external resistors used to set the gain. For instance, if
0.1%resistorsareusedforRINandROUTthentheresulting
worst-case gain error is 0.4% with RIN = 100Ω. Figure 6 is
a graph of the maximum gain error which can be expected
versus the external resistor tolerance.
Output Current Limitations Due to Power Dissipation
The LT6109 can deliver a continuous current of 1mA to the
OUTA pin. This current flows through RIN and enters the
current sense amplifier via the SENSEHI pin. The power
dissipated in the LT6109 due to the output signal is:
POUT = (VSENSEHI – VOUTA) IOUTA
Since VSENSEHI ≈ V+, POUTA ≈ (V+ – VOUTA) IOUTA
RESISTOR TOLERANCE (±%)
0.01
0.1
RESULTING
GAIN
ERROR
(%)
1
10
0.1
1
10
610912 F06
RIN = 100
RIN = 1k
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