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Small-Sized Current Sensor
CQ-121E, CQ-131E
Features
■ Small-sized open loop current transducer using Linear Hall
Effect IC
■ Simple structure and few parts
■ The primary conductor and the Hall Effect IC are isolated
electrically
■ The amplifier is unnecessary.It is possible to connect to
micro-computer or AD converter directly.
■ Small-size 8(D)
×20(W)
×19(H)
■ Supply voltage range 3∼5.5V
■ Ratiometric analog output
■ Quick response Typ.3μs
■ Supply current Typ.9mA
■ Operating Temperature Range −30∼80℃
■ In accordance with IEC standards
Principles and Configration of Current Transducer
Principles of current sensing
●Generating the magnetic flux
density outside the primary
conductor,when the current is
biased in the primary conductor.
●Inserting Linear Hall Effect IC
into GAP.
●Generating the parallel
magnetic field inside the
core.
Generating the
magnetic flux
density inside
GAP,which is
proportionate
to current.
Configration of CQ-121E,131E
Generating the
voltage which is
proportionate to
magnetic
flux
density.
Functional Block Diagram
1:Vcc
Linear Hall Effect IC
Primary Conductor
3:Out
Core
Sensed Current
Others
◆Frequently Asked Questions
Q1: How much is sensed current resolution?
A1: CQ-121E is about 100mA, CQ-131E is about 250mA.
Q2: How much is maximum current?
A2: "Maximum DC continuous current is 30A.
Linearity error ±1% of CQ-121E is guaranteed between -25 and 25A.
And that of CQ-131E is between -50 and 50A."
2:Gnd
Dimensions CQ-121E, CQ-131E
Color label for
sensitivity selection
1.5±1.0
20±0.3
Resin fixed part
for primary conductor
Label specifications
7
Lot No
16.7±0.3
4.4±0.2
Max.19
D
5
Label(White)
6.15±1.0
1
6.3±0.2
2 3
3.0±0.2
0.2±0.2
N
P
1.27±0.5
1.27±0.5
6.9±0.15
6.9±0.15
4.6±0.5
4.6±0.5
2.2±0.5
Primary conductor
φ1.6±0.05
0.25
3.4±0.5
0.25
2.2
8±0.3
1.6±0.5
0.4
3.0
1
Vcc
2
3
Gnd
Out
Unit : mm
Electrical specifications of CQ-121E, 131E
◆Absolute Maximum Ratings(Ta=25℃)
CQ-121E, 131E
Item
Symbol
Maximum Input Voltage
◆Recommended operating condition(Ta=25℃)
CQ-121E, 131E
Limit
Unit
Item
Symbol
Min
Typ
Max
5.0
5. 5
V
1
mA
Vccmax
6
V
Supply voltage
Vcc
3.0
Iomax
±1.2
mA
Output current
Io
−1
Operating Temp Range
Topr
−30 ∼ 80
℃
Storage Temp Range
Tstg
−30 ∼ 85
℃
Maximum Output Current
◆Electrical specifications for current sensing(Ta=25℃, Vcc=5V)
CQ-121E
Item
Symbol Min
Maximum DC
Imax
sensed current
Rated sensed
Iin
current
Maximum sensed Ins
current
Sensitivity
Linearity error
Vh
ρ
Typ
Max
Unit
mV/A
Sensitivity
%F.S.
Hysteresis is
includedNote3)
A
−30
30
A
72
−1
1
Note1)Design target
Note2)Slope in approximate straight line
Note3)Maximum differnce between approximate straight line and measured output voltage divided
by maximum rated current
◆Electrical specifications(Ta=25℃, Vcc=5.0V)
CQ-121E, 131E
Item
Symbol Min
Supply current
Icc
Offset voltageNote1)
Vof
Response timeNote2)
Trr
Frequency responseNote2)
f
Temperature driftNote3) Vhd
Temperature coefficient
of VofNote3)
Isolation voltage
Isolation
resistanceNote2)
2.35
50
−5
Vofd −0.5
Typ
Max
Unit
9
12
mA
2.5
2.65
V
3
5
μsec
100
kHz
5
%
0.5
mV/℃
1.5
kV
500
MΩ
Note1)Output voltage at 0(A)in approximate straight line
Note2)Design target
Note3)For reference only
Symbol Min
Note2)
A
25
63.5
Item
Linearity error
guarantee range
Output unsaturation
rangeNote1)
30
−25
55
CQ-131E
Remarks
Maximum DC
Imax
sensed current
Rated sensed
Iin
current
Maximum sensed Ins
current
−30
Vh
ρ
Linearity error
Typ
Max
Unit
−30
30
A
−50
50
A
−60
60
A
30
mV/A
Note2)
%F.S.
Hysteresis is
includedNote3)
24
−1
27
1
Remarks
Linearity error
guarantee range
Output unsaturation
rangeNote1)
◆Sensitivity rank
CQ-121E
Sensitivity range(mV/A) Typical
sensitivity
Min
Max
(mV/A)
Sensitivity
rank
Color of
label
B
Green
55.0
60.7
57.85
±4.9
C
Blue
59.9
66.1
63.00
±4.9
D
Yellow
65.3
72.0
68.65
±4.9
Remarks
Without load
Iin=0
10%Decrease
point
The maximum error from
room temperature
Iin=0
60sec
(Commercial cycle)
500V(DC)
Unit
Variation
(%)
CQ-131E
Sensitivity range(mV/A) Typical
sensitivity
Min
Max
(mV/A)
Sensitivity
rank
Color of
label
Variation
(%)
B
Green
24.0
26.3
25.15
±4.6
C
Blue
25.7
28.3
27.00
±4.8
D
Yellow
27.7
30.3
28.85
±4.0
Characteristics of Current Transducer CQ-121E, CQ-131E(For reference only)
◆Primary Sensed Current versus Output Voltage
◆Sensitivity versus Ambient Temparature
Sensitivity(mV/A)
70
Vcc=4V
50
40
Vcc=3V
30 CQ-131E
Vcc=5V
Vcc=4V
Vcc=3V
20
10
0
−60 −40 −20
0
20
40
60
Ambient Temparature(℃)
80
10
8
6
4
2
−20
0
20
40
60
Ambient Temparature(℃)
80
100
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
−40
Vcc=5V
Vcc=4V
Vcc=3V
−20
0
20
40
60
Ambient Temparature(℃)
80
100
◆Frequency Response
Output change ratio(%)
12
Supply Current(mA)
Output Voltage(V)
100
◆Supply Current versus Ambient Tenparature(CQ-121E, 131E)
0
−40
100
◆OA Output Voltage versus Ambient Temparature
Vcc=5V
60 CQ-121E
CQ-131E
5
4.5
4
3.5
3
2.5
2
Vcc=5V
1.5
Vcc=4V
1
0.5
Vcc=3V
0
−100−80 −60 −40 −20 0
20 40 60 80
Primary Sensed Current(A)
Output Voltage(V)
Output Voltage(V)
CQ-121E
5
4.5
4
3.5
3
2.5
Vcc=5V
2
1.5
Vcc=4V
1
0.5
Vcc=3V
0
−50 −40 −30 −20 −10 0
10 20 30 40 50
Primary Sensed Current(A)
10
0
−10
−20
−30
−40
−50
0.01
0.1
1
10
Frequency(kHz)
100
1000
Step Response(CQ-121E, 131E)
Primary
sensed
Current
Primary sensed
Current
5μsec/div
5μsec/div
1000pF
5.1kΩ
Output
Voltage
(1V/div)
Output Voltage
(1V/div)
ASAHI KASEI MICRODEVICES CORPORATION
Headquarters
1-105 Kanda Jinbocho, Chiyoda-ku, Tokyo 101-8101, Japan
TEL : +81-3-3296-3961 FAX : +81-3-3296-3962
http://www.akm.com
March 2012
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