CQ206A

[CQ-206A] CQ-206A High-Speed Small-Sized Current Sensor Overview CQ-206A is an open-type current sensor using a Hall sensor which outputs the analog voltage proportional to the AC/DC current. Quantum well ultra-thin film InAs (Indium Arsenide) is used as the Hall sensor, which enables the high-accuracy and high-speed current sensing. Simple AI-Shell package with the Hall sensor, magnetic core, and primary conductor realizes the space-saving and high reliability. Features - Bidirectional type - Electrical isolation between the primary conductor and the sensor signal - 5V single supply operation - Ratiometric output - Low variation and low temperature drift of sensitivity and offset voltage - Low noise output: 2.1mVrms (max.) - Fast response time: 1μs (typ.) - Small-sized package, halogen free Functional Block Diagram P Magnetic Core Amplifier Hall Sensor Buffer VSS Compensation Bias Unit EEPROM Unit DATA_IO N VOUT VDD SCLK Figure 1. Functional block diagram of CQ-206A MS1443-E-01 2013/06 -1- [CQ-206A] Circuit Blocks Table 1. Explanation of circuit blocks Circuit Block Function Hall Sensor Amplifier Hall element which detects magnetic flux density generated from the measured current. Amplifier of Hall element’s output. Output buffer with gain. This block outputs the voltage (V OUT) proportional to the current applied to the primary conductor. Compensation circuit which adjusts the temperature drifts of sensitivity and offset voltage. Drive circuit for Hall element. Non-volatile memory for setting adjustment parameters. The parameters are adjusted before the shipment. Magnetic core which gathers the magnetic flux density to the Hall element. Buffer Compensation Bias Unit EEPROM Unit Magnetic Core Typical Output Characteristics VOUT VDD N P ← CQ-206A ← (Top View) IIN 1/2 VDD VDD VOUT −INS N→P 0 P→N INS IIN Figure 2. Typical output characteristics of CQ-206A Pin/Function Table 2. Pin-out description No. Name I/O 1 2 3 4 5 6 7 DATA_IO VDD VSS VOUT SCLK P N O I I 7 Description Test pin (connect to ground) Power supply pin (5V) Ground pin (0V) Analog output pin Test pin (connect to ground) Primary current pin (+) Primary current pin (−) 6 CQ-206A (Top View) 1 2 3 4 5 Figure 3. Pin-out diagram MS1443-E-01 2013/06 -2- [CQ-206A] Absolute Maximum Ratings Table 3. Absolute maximum ratings Parameter Symbol Min. Max. Units Supply Voltage Analog Output Current Storage Temperature VDD IOUT Tstg −0.3 −1 −40 6.5 1 125 V mA C Notes VDD VOUT WARNING: Operation at or beyond these limits may result in permanent damage to the device. Normal operation is not guaranteed at these extremes. Primary Current Derating Curve Conditions: Mounted on the test board complying with the EIA/JEDEC Standards (EIA/JESD51.) 60 50 IRMSmax [A] 40 30 20 10 0 -60 -40 -20 0 20 40 60 80 100 Ta [℃] NOTE) Cooling or thermal radiation will improve the derating curve above. Figure 4. Primary current derating curve of CQ-206A Recommended Operating Conditions Table 4. Recommended operating conditions Parameter Symbol Min. Typ. Max. Units Supply Voltage Output Current Output Load Capacitance Operating Ambient Temperature VDD IOUT 4.5 −0.5 5.0 5.5 0.5 V mA VOUT 100 pF VOUT 90 C CL Ta −40 Notes NOTE: Electrical characteristics are not guaranteed when operated at or beyond these conditions. MS1443-E-01 2013/06 -3- [CQ-206A] Electrical Characteristics Table 5. Electrical characteristics Conditions (unless otherwise specified): Ta=25C，VDD=5V Parameter Maximum Primary Current (RMS) Symbol IDD Sensitivity* Vh Offset Voltage* Vof Linear Sensing Range INS Linearity Error* ρ Rise Response Time tr Fall Response Time tf Bandwidth fT Min. Typ. −50 IRMSmax Current Consumption Output Noise** Conditions No Loads IIN=0A Max. Units 50 A 9 mA 44.1 45 45.9 mV/A 2.423 2.500 2.577 V −46 46 A −1 1 %F.S. IIN 90% → VOUT 90% CL=100pF IIN 10% → VOUT 10% CL=100pF −3dB, CL=100pF 1 μs 1 μs 400 kHz VNrms 2.1 mVrms Maximum Temperature Drift of Sensitivity Vh-dmax Variation ratio to Vh(Ta=35C) Ta=−40~90C ±2 % Maximum Temperature Drift of Offset voltage Vof-dmax Variation from Vof(Ta=35C) Ta=−40~90C, IIN=0A ±17 mV Ratiometricity Error of Sensitivity** Ratiometricity Error of Offset Voltage** Primary Conductor Resistance Vh-R VDD=4.5V~5.5V −1 1 % Vof-R VDD=4.5V~5.5V IIN=0A −1 1 % Isolation Voltage** VINS AC 50/60Hz, 60s 2.5 kV Isolation Resistance** RINS DC 1kV 500 MΩ R1 μΩ 100 * These parameters can drift by the values described in ‘Reliability Tests’ section over the lifetime of the product. ** These characteristics are guaranteed by design. MS1443-E-01 2013/06 -4- [CQ-206A] Characteristics Definitions (1) Sensitivity Vh [mV/mT], offset voltage Vof [V] Sensitivity is defined as the slope of the approximate straight line calculated by the least square method, using the data of VOUT voltage (VOUT) when the primary current (IIN) is swept within the range of linear sensing range (INS). Offset voltage is defined as the intercept of the approximate straight line above. (2) Linearity error ρ [%F.S.] Linearity error is defined as the ratio of the maximum error voltage (Vd) to the full scale (F.S.), where Vd is the maximum difference between the VOUT voltage (VOUT) and the approximate straight line calculated in the sensitivity and offset voltage definition. Definition formula is shown in below: ρ = Vd / F.S. × 100 NOTE) Full scale (F.S.) is defined by the multiplication of the linear sensing range and sensitivity (See Figure 5). Approximate straight line by least square method VOUT(V) Vd −|INS| 0 F.S. =2Vh×|INS| |INS| IIN(A) Figure 5. Output characteristics of CQ-206A (3) Ratiometric error of sensitivity Vh-R [%] and ratiometric error of offset voltage Vof-R [%] Output of CQ-206A is ratiometric, which means the values of sensitivity (V h) and offset voltage (Vof) are proportional to the supply voltage (VDD). Ratiometric error is defined as the difference between the Vh (or Vof) and ideal Vh (or Vof) when the VDD is changed from 5.0V to VDD1 (4.5V