AD8213YRMZ Analog Devices Inc, AD8213YRMZ Datasheet - Page 12

• Manufacturer Part Number: AD8213YRMZ
• Description: IC CURRENT MONITOR 0.25% 10MSOP
• Manufacturer: Analog Devices Inc

Specifications of AD8213YRMZ

• Function: Current Monitor
• Sensing Method: High-Side
• Accuracy: ±0.25%
• Voltage - Input: -2 ~ 65 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• No. Of Amplifiers: 2
• Input Offset Voltage: 1mV
• Gain Db Max: 20dB
• Bandwidth: 500kHz
• Cmrr: 120dB
• Slew Rate: 4.5V/µs
• Supply Voltage Range: 4.5V To 5.5V
• Supply Current: 2.5mA
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -

AD8213
APPLICATIONS INFORMATION
HIGH-SIDE CURRENT SENSE WITH A LOW-SIDE
SWITCH
In such load control configurations, the PWM controlled 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 28). An advantage of placing the shunt on
the high side is that the entire current, including the recircu-
lation current, can be measured, because 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.
BATTERY
HIGH-SIDE CURRENT SENSING
In this configuration, the shunt resistor is referenced to the
battery. High voltage will be present at the inputs of the current
sense amplifier. In this mode, the recirculation current is again
measured and shorts to ground can be detected. When the
shunt is battery referenced the AD8213 produces a linear
ground referenced analog output. An
to provide an overcurrent detection signal in as little as 100 ns.
This feature will be useful in high current systems, where fast
shutdown in overcurrent conditions is essential.
SWITCH
INDUCTIVE
CLAMP
DIODE
SHUNT
LOAD
Figure 28. Low-Side Switch
CAP2
1
2
3
4
5
–IN2
+IN2
GND
OUT2
CF2
AD8213
OUT1
–IN1
+IN1
CF1
V+
CAP1
10
9
8
7
6
AD8214
5V
INDUCTIVE
LOAD
SHUNT
can also be used
CLAMP
DIODE
SWITCH
BATTERY
Rev. A | Page 12 of 16
LOW-SIDE CURRENT SENSING
In systems where low-side current sensing is preferred, the
AD8213 provides an integrated solution with great accuracy.
Ground noise is rejected, CMRR is typical higher than 90 dB, and
output linearity is not compromised, regardless of the input
differential voltage.
BATTERY
SWITCH
SHUNT
LOAD
INDUCTIVE
CLAMP
DIODE
SWITCH
SHUNT
LOAD
Figure 30. Ground Referenced Shunt Resistor
Figure 29. Battery Referenced Shunt Resistor
DETECTION (<100ns)
OVERCURRENT
CAP2
1
2
3
4
5
1
2
3
4
5
–IN2
+IN2
GND
OUT2
CF2
–IN2
+IN2
GND
OUT2
CF2
–IN
AD8213
V
AD8213
8
1
OUT
S
NC
5
4
+IN
NC
OUT1
AD8214
V
7
2
GND
+IN1
–IN1
AD8214
OUT1
CF1
REG
–IN1
+IN1
V+
6
3
CF1
V+
V
GND
CAP1
REG
10
6
3
9
8
7
6
+IN
NC
7
2
10
9
8
7
6
5V
OUT
DETECTION (<100ns)
NC
5
4
–IN
V
OVERCURRENT
8
1
S
5V
INDUCTIVE
LOAD
SHUNT
SWITCH
CLAMP
DIODE
LOAD
SWITCH
SHUNT
BATTERY