參數資料
型號: AD8207WBRZ-R7
廠商: Analog Devices Inc
文件頁數: 6/16頁
文件大?。?/td> 0K
描述: IC AMP 65V DIFF BIDIRECT 8SOIC
標準包裝: 1,000
放大器類型: 零漂移
電路數: 1
轉換速率: 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)
供應商設備封裝: 8-SO
包裝: 帶卷 (TR)
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
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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