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| 型號(hào)： | AD8206YRZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 4/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP DIFF 8SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Current Sense Amplifiers |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 0.5 V/µs |
| -3db帶寬： | 100kHz |
| 電壓 - 輸入偏移： | 2000µV |
| 電流 - 電源： | 2mA |
| 電壓 - 電源，單路/雙路(±)： | 4.5 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： | 帶卷 (TR) |
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AD8206
Data Sheet
Rev. B | Page 12 of 16
APPLICATIONS
A typical application for the AD8206 is high-side measurement
of a current through a solenoid for PWM control of the solenoid
opening. Typical applications include hydraulic transmission
control and diesel injection control.
Two typical circuit configurations are used for this type of
application.
HIGH-SIDE CURRENT SENSE WITH A LOW-SIDE
SWITCH
In this case, the PWM control switch is ground referenced. An
inductive load (solenoid) is tied to a power supply. A resistive
shunt is placed between the switch and the load (see Figure 22).
An advantage of placing the shunt on the high side is that the
entire current, including the recirculation current, can be
measured since the shunt remains in the loop when the switch
is off. In addition, diagnostics can be enhanced because shorts
to ground can be detected with the shunt on the high side.
In this circuit configuration, when the switch is closed, the
common-mode voltage moves down to near the negative rail.
When the switch is opened, the voltage reversal across the
inductive load causes the common-mode voltage to be held
one diode drop above the battery by the clamp diode.
04953-019
+IN VREF1 +VS OUT
–IN
GND VREF2 NC
INDUCTIVE
LOAD
AD8206
CLAMP
DIODE
42V
BATTERY
SHUNT
SWITCH
NC = NO CONNECT
5V
Figure 22. Low-Side Switch
HIGH-SIDE CURRENT SENSE WITH A HIGH-SIDE
SWITCH
This configuration minimizes the possibility of unexpected
solenoid activation and excessive corrosion (see Figure 23). In
this case, both the switch and the shunt are on the high side.
When the switch is off, this removes the battery from the load,
which prevents damage from potential shorts to ground, while
still allowing the recirculating current to be measured and
providing for diagnostics. Removing the power supply from the
load for the majority of the time minimizes the corrosive effects
that could be caused by the differential voltage between the load
and ground.
When using a high-side switch, the battery voltage is connected
to the load when the switch is closed, causing the common-
mode voltage to increase to the battery voltage. In this case,
when the switch is opened, the voltage reversal across the
inductive load causes the common-mode voltage to be held
one diode drop below ground by the clamp diode.
04953-020
+IN VREF1 +VS OUT
–IN
GND VREF2 NC
INDUCTIVE
LOAD
AD8206
CLAMP
DIODE
42V
BATTERY
SHUNT
SWITCH
NC = NO CONNECT
5V
Figure 23. High-Side Switch
Another typical application for the AD8206 is as part of
the control loop in H-bridge motor control. In this case, the
AD8206 is placed in the middle of the H-bridge (see Figure 24)
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 typi-
cally a stable reference voltage in this type of application. This
instability in the ground reference causes the measurements
that could be made with a simple ground referenced op amp to
be inaccurate.
The AD8206 measures current in both directions as the
H-bridge switches and the motor changes direction. The
output of the AD8206 is configured in an external reference
bidirectional mode, see the Output Offset Adjustment section.
04953-021
+IN VREF1 +VS OUT
–IN
GND VREF2 NC
AD8206
SHUNT
5V
2.5V
5V
CONTROLLER
NC = NO CONNECT
MOTOR
Figure 24. Motor Control Application
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