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參數(shù)資料
| 型號(hào)： | AD8207WBRZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP 65V DIFF BIDIRECT 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 98 |
| 放大器類型： | 零漂移 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 1 V/µs |
| -3db帶寬： | 150kHz |
| 電壓 - 輸入偏移： | 100µV |
| 電流 - 電源： | 2.5mA |
| 電壓 - 電源，單路/雙路(±)： | 3.3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 管件 |
AD8207
Rev. 0 | Page 14 of 16
APPLICATIONS INFORMATION
MOTOR CONTROL
3-Phase Motor Control
The AD8207 is ideally suited for monitoring current in 3-phase
motor applications.
The 150 kHz typical bandwidth of the AD8207 allows for
instantaneous current monitoring. Additionally, the typical
low offset drift of 500 nV/°C means that the measurement
error between the two motor phases will be at a minimum
over temperature. The AD8207 rejects PWM input common-
mode voltages in the range of 4 V to +65 V (with a 5 V
supply). Monitoring the current on the motor phase allows
for sampling of the current at any point and allows for
diagnostic information such as a short to GND and battery.
Refer to Figure 34 for a typical phase current measurement
setup with the AD8207.
H-Bridge Motor Control
Another typical application for the AD8207 is as part of
the control loop in H-bridge motor control. In this case, the
shunt resistor is placed in the middle of the H-bridge (see
Figure 33) so that it can accurately measure current in both
directions by using the shunt available at the motor. This is
a better solution than a ground referenced op amp because
ground is not typically a stable reference voltage in this type
of application. The instability of the ground reference causes
inaccuracies in the measurements that could be made with a
simple ground referenced op amp. The AD8207 measures
current in both directions as the H-bridge switches and the
motor changes direction. The output of the AD8207 is config-
ured in an external referenced bidirectional mode (see the
Bidirectional Operation section).
AD8207
+IN
SHUNT
MOTOR
VREF1 +VS OUT
–IN
GND
5V
CONTROLLER
VREF2RANGE
5V
2.5V
0
916
0-
0
20
Figure 33. H-Bridge Motor Control Application
AD8207
BIDIRECTIONAL CURRENT MEASUREMENT
REJECTION OF HIGH PWM COMMON-MODE VOLTAGE (–4V TO +65V)
AMPLIFICATION
HIGH OUTPUT DRIVE
AD8214
INTERFACE
CIRCUIT
V+
IU
IV
IW
V–
OPTIONAL
PART FOR
OVERCURRENT
PROTECTION AND
FAST (DIRECT)
SHUTDOWN OF
POWER STAGE
AD8207
CONTROLLER
5V
M
09
16
0-
01
7
Figure 34. 3-Phase Motor Control
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