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參數(shù)資料
| 型號(hào)： | ADM4073FWRJZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP CS 1.8MHZ SOT23-6 |
| 產(chǎn)品培訓(xùn)模塊： | Current Sense Amplifiers |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 電流檢測 |
| 電路數(shù)： | 1 |
| 增益帶寬積： | 1.8MHz |
| 電流 - 輸入偏壓： | 40µA |
| 電壓 - 輸入偏移： | 1000µV |
| 電流 - 電源： | 500µA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 28 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-6 |
| 供應(yīng)商設(shè)備封裝： | SOT-23-6 |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 765 (CN2011-ZH PDF) |
| 其它名稱： | ADM4073FWRJZ-REEL7DKR |
ADM4073
Rev. A | Page 10 of 12
THEORY OF OPERATION
The current from the source flows through RSENSE, which gen-
erates a voltage drop, VSENSE, across the RS+ and RS terminals
of the sense amplifier. The Input Stage Amplifier A1 regulates
its inputs to be equal, thereby shunting a current proportional
to VSENSE/RG1 to the output current mirror. This current is then
multiplied by a gain factor of b in the output stage current mir-
ror and flows through RGD to generate VOUT. Therefore, VOUT is
related to VSENSE by the ratio of R G1 to RGD and the current gain
of b.
VOUT = AV × VSENSE
where:
AV = RGD/R G1 × b
Av is equal to different voltages depending upon the model of
the device.
20 V/V for ADM4073T.
50 V/V for ADM4073F.
100 V/V for ADM4073H.
2V TO 28V
3V TO 28V
0.1F
VOUT
RSENSE
ILOAD
IRG1
VOUT
RS+
GND
AV
RS–
VCC
RG2
RGD = 12k
RG1
ADM4073
IRGD
CURRENT
MIRROR
05
13
1-
0
26
OUT
Figure 25. Functional Block Diagram
RSENSE
The ADM4073 has the ability to sense a wide variety of currents
by selecting a particular sense resistor. Select a suitable output
voltage for full-scale current, such as 10 V for 10 A. Then, select
a gain model that gives the most efficient use of the sense volt-
age range (150 mV max).
In the example above, using the ADM4073H (gain of 100) gives
an output voltage of 10 V when the sense voltage is 100 mV.
Use the following equation to determine what value of sense
resistor gives 100 mV with 10 A flowing through it:
RSENSE = 100 mV/10 A
RSENSE = 10 mΩ
To measure lower currents accurately, use as large a sense
resistor as possible to utilize the higher end of the sense voltage
range. This reduces the effects of the offset voltage errors in the
internal amplifier.
When currents are very large, it is important to take the I2R
power losses across the sense resistor into account. If the sense
resistor’s rated power dissipation is not sufficient, its value can
drift, giving an inaccurate output voltage or it could fail alto-
gether. This, in turn, causes the voltage across the RS+ and RS
pins to exceed the absolute maximum ratings.
If the monitored supply rail has a large amplitude high
frequency component, choose a sense resistor with low
inductance.
INPUT
COPPER PCB TRACE
OUTPUT
3V TO 28V
0.1F
RSENSE
OUT
RS+
GND
RS–
VCC
ADM4073
05
13
1-
00
4
Figure 26. Using PCB Trace for Current Sensing
OUTPUT (OUT)
The output stage of the ADM4073 is a current source driving a
pull-down resistance. To ensure optimum accuracy, care must
be taken not to load this output externally. To minimize output
errors, ensure OUT is connected to a high impedance input
stage. If this is not possible, output buffering is recommended.
The percent error introduced by output loading is determined
with the following formula:
(
)
(
)
LOAD
INT
OUT
LOAD
R
Error
+
=
_
/
1
100
%
where:
RLOAD is the external load applied to OUT.
ROUT_INT is the internal output resistance (12 kΩ).
VOUT = (ILOAD × RSENSE) × AV
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