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