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 8D x20W x19H Supply voltage range 35.5V Ratiometric analog output Quick response Typ.3s Supply current Typ.9mA Operating Temperature Range -3080 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 1.51.0 200.3 Resin fixed part for primary conductor Label specifications 7 Lot No 16.70.3 4.40.2 Max.19 D 5 LabelWhite 6.151.0 1 6.30.2 2 3 3.00.2 0.20.2 N P 1.270.5 1.270.5 6.90.15 6.90.15 4.60.5 4.60.5 2.20.5 Primary conductor 1.60.05 0.25 3.40.5 0.25 2.2 80.3 1.60.5 0.4 3.0 1 Vcc 2 3 Gnd Out Unit : mm Electrical specifications of CQ-121E, 131E Absolute Maximum RatingsTa=25 CQ-121E, 131E Item Symbol Maximum Input Voltage Recommended operating conditionTa=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 sensingTa=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 Typ Max Unit mV/A Sensitivity %F.S. Hysteresis is includedNote3 A -30 30 A 72 -1 1 Note1Design target Note2Slope in approximate straight line Note3Maximum differnce between approximate straight line and measured output voltage divided by maximum rated current Electrical specificationsTa=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 sec 100 kHz 5 % 0.5 mV/ 1.5 kV 500 M Note1Output voltage at 0Ain approximate straight line Note2Design target Note3For 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 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 rangemV/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 500VDC Unit Variation (%) CQ-131E Sensitivity rangemV/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-131EFor reference only Primary Sensed Current versus Output Voltage Sensitivity versus Ambient Temparature SensitivitymV/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 CurrentmA Output VoltageV 100 Supply Current versus Ambient TenparatureCQ-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 CurrentA Output VoltageV Output VoltageV 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 CurrentA 10 0 -10 -20 -30 -40 -50 0.01 0.1 1 10 FrequencykHz 100 1000 Step ResponseCQ-121E, 131E Primary sensed Current Primary sensed Current 5sec/div 5sec/div 1000pF 5.1k 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