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  • FS-CAS3.3 Integrated current sensor
Integrated current sensor

FS-CAS3.3 Integrated current sensor

The RCT series of current sensors provides a smaller, more cost-effective solution for current detection of AC and DC in industrial and automotive applications, and offers a variety of output modes.
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Description

Advantages

Parameters

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How it works:

Open-loop current sensors use ampere's law (generated around an energized straight wire)

The magnetic field is proportional to the current in the wire), using the characteristics of the hall device,

By detecting the magnitude of the magnetic field intensity B generated by the primary side current, it can be detected

The amount of current in the wire. The ratio of B to I in the linear interval of hysteresis

The relationship is:

B (IP) = K * IP (K is a constant)

Hall voltage can be expressed as:

VH=(RH/d) * I * K * IP

Except that IP is a variable, the rest are constants, thus:

VH=K1 * IP (K1 is a constant)

Specific Hall chips derive the primary current by amplifying the VH to obtain the voltage.


Recommended circuit:




* The BYPASS capacitor at the VCC end must be as close as possible to the Vc foot of the sensor

* The BYPASS capacitor at the Vout end must be as close as possible to the Vout foot of the sensor


Package form:

                                  Standard Package (PFF)                                      PSF package                                      PSS package                                               SMT packaging


Naming rules:



Standard (PFF) package size diagram

PSF package size diagram


PSS package size diagram


SMT package size diagram


Performance parameter definition:

Static output voltage (QVO) : The sensor output voltage VQVO in the state of no obvious magnetic field B = 0 G

-xR: VQVO and gain have a constant ratio to the supply voltage VCC; VQVO  = VCC/2

-xF: VQVO and gain do not change with the power supply voltage VCC within a certain range; VQVO = 1. 65V or VQVO = 0. 5V

Sens(Sensitivity): SenS is the slope of the reference output line VOUT = VQVO + 1.32 × IP/IP_MAX, which refers to the change of output with the change of current. The relationship between SenS = 1.32 /IP_MAX is as follows

Offset with Temperature: The zero point may be offset at the operating ambient temperature due to internal component tolerances, stress and heat dissipation factors.

Sensitivity with temperature: Due to the influence of the internal temperature compensation factor, the sensitivity will change at the entire operating temperature compared to the expected value at room temperature.

Electrical Offset Voltage: The error caused by the noise caused by the amplification multiple of the HALL component and the operational amplifier itself is called the offset voltage

Zero Magnetic Offset voltage: When the primary current is caused by the maximum IP - >0, the error generated at the output end is called the zero magnetic offset voltage due to the hysteresis phenomenon of the sensor's magnetic core material

offset voltage: The offset voltage is the output voltage when the primary current is zero, and the ideal value is

VQVO = VCC/2(or 1.65V). Therefore, the difference between VQVO and the ideal value is called the total zero offset voltage error. This offset error can be attributed to the zero offset voltage (due to the resolution of the QVO adjustment within the ASIC), magnetic offset, temperature drift, and temperature-induced hysteresis.

Response Time: The response time of the sensor refers to the time interval between when the applied current reaches the final 90% and the sensor output to the corresponding value of the applied current

rise time: The rise time of the sensor refers to the time interval between 10% of the sensor output and reaching the final 90%






Total Output Error (ETOT): The difference between the sensor's current measurement and the actual current (IP), defined by the formula as the difference between the ideal output voltage and the actual output voltage divided by the ideal sensitivity:

At relatively high current, ETOT is mainly caused by sensitivity error. At relatively low currents, ETOT is mainly due to bias voltage error (VOE). In fact, when IP approaches zero, ETOT approaches infinity due to bias voltage error.

Note:

1. Incorrect cable connections may damage the sensor. After the sensor is connected to the 3.3V power supply, the measured current passes through the arrow direction of the sensor, and the corresponding voltage value can be measured at the output end.

2.-BR: The output voltage VOUT is directly proportional to the supply voltage VCC, VOUT = VCC⁄2 + 1.32 × IP⁄I, and the supply voltage changes P(MAX).

Change, will cause VOUT ratio changes.

For example, the VCC ranges from 3.15V to 3.45V. The corresponding static output voltage VQVO at 0A ranges from 1.575V to 1.725V. The output range of full scale VOUT(IPMAX) is 2.895V~3.045V.

-BF mode: zero output voltage VQVO=1.65V, gain fixed at 1.32V, output curve: VOUT= 1.65 +1.32× IP/ ipp (MAX)

For example, the VCC ranges from 3.15V to 3.45V. The corresponding static output voltage VQVO output at 0A is 1.65V; Full-scale VOUT(IPMAX) has a constant output of 2.97V.


• Open loop current sensor based on hall induction principle

• Single power supply 3.3V

• Support unidirectional and bidirectional output

• Analog output

• The measurement current range on the primary side can be from ±50A to ±250A

• Sensor operating temperature range: -40 °C to +125°C

(150A is -40 °C to +105°C; 200A is -40 °C to +85°C)

• Zero output voltage:

-xR: Bias the output of QVO and VCC in equal proportion, and the Gain is fixed

VQVO=VCC/2

-xF: The bias QVO and Gain are both fixed

VQVO=1.65 or 0.50

• Good accuracy, linearity and temperature drift

• Low internal resistance, can effectively control heating power consumption

Product Application:

• EV/HEV motor controller

• Frequency changer

• DC/DC


Pin definition:


pinnameDescription
1VCCSensor power supply
2GNDto
3VOUTSensor analog output
4IP+Current inflow +
5IP-Current inflow -


Maximum rated parameter


CharacteristicSymbolRatingUnit
Supply voltageVCC-0.3 to 4.6V
Supply currentICC18mA
Output voltageVOUT0.15 to VCC-0.15V
Output currentIOUT±40mA
Operating temperatureTA-40 to 150℃
Maximum junction temperatureTJ165℃
Storage temperatureTS-55 to 165℃


General electric parameter

Dc operating parameters at VCC = 3.3V (unless otherwise specified), TA within the specified temperature range.


ParameterSymbolConditionMinTyp.MaxUnit
Supply voltageVCC
33.33.6V
Supply currentICCRL ≥ 10KΩ
1318mA
Power-on delayTPOTA=25°C
80
μs
QVO follow-up error (-R)Er
-0.3
0.3%


RCTxxxBR
VCC/2
Zero current outputVQVORCTxxxBFTA = 25°C1.65








RCTxxxUF

0.5


RCTxxxBR±1.32V
Output voltage range @IPVOUT-VQVORCTxxxBF



RCTxxxUF2.47
Load resistanceRLVOUT to VCC or GND2

KΩ
Load capacitanceCLVOUT TO GND6
100nF
Response timetRESPONSETA=25°C, CL=1nF, IP step=50% of IP+, 90% input to 90% output
3
μs
bandwidthBWSmall signal –3dB, CL=1nF, TA=25°C120170
KHz
Output impedanceROUTTA = 25°C–3–Ω


Isolation characteristic


CharacteristicSymbolNotesRatingUnit
*1 Dielectric strength test voltageVISOAccording to UL standard 60950-1 second edition, Agency type test is 60 seconds4800VAC
Operating voltage (basic insulation)VWFSIBasic (single) isolation according to UL standard 60950-1, 2nd Edition990VDC or Vpk



700Vrms
Operating voltage (enhanced insulation)VWFRIEnhanced (double) isolation according to UL standard 60950-1, 2nd Edition636VDC or Vpk



450Vrms

* 1:60 second test for UL test only; Tested in production against UL60950-1 2nd edition.



U050 Performance parameters

Dc operating parameters at VCC = 3.3V (unless otherwise specified), TA=-40°C ~125°C


ParameterSymbolConditionMinTyp.MaxUnit
Nominal parameter





Primary current measurement rangeIP
0
50A
Sensor sensitivitySensTA@VCC=3.3V
49.4
mV/A
Precision parameter





Sensitivity errorESens@TA=25°C;VCC=3.3V-1
1%
Zero offset voltage
IP=0A，TA=25°C-4±34mV

VOEIP=0A，TA=-40°C ~125°C-20±820mV
Zero magnetic offset current
IP=0A, TA=25°C, after excursion of


mA

IOM50A
100200
Zero offset currentIOFFSETTA=25°C

0.15A
Linearity errorLinERROf full rang-10.51%
Total output errorETOT(HT)Full scale of IP, TA=25°C~125°C-2
2%

ETOT(LT)Full scale of IP, TA=–40°C~25°C-2
2%


B100 Performance parameters

Dc operating parameters at VCC = 3.3V (unless otherwise specified), TA=-40°C ~125°C



ParameterSymbolConditionMinTyp.MaxUnit
Nominal parameter





Primary current measurement rangeIP
-100
100A
Sensor sensitivitySensTA@VCC=3.3V
13.2
mV/A
Precision parameter





Sensitivity errorESens@TA=25°C;VCC=3.3V-1
1%
Zero offset voltage
IP=0A，TA=25°C-4±34mV

VOEIP=0A，TA=-40°C ~125°C-20±820mV
Zero magnetic offset current
IP=0A, TA=25°C, after excursion of


mA

IOM100A
200300
Zero offset currentIOFFSETTA=25°C-
0.5A
Linearity errorLinERROf full rang-10.51%
Total output errorETOT(HT)Full scale of IP, TA=25°C~125°C-2
2%

ETOT(LT)Full scale of IP, TA=–40°C~25°C-2
2%


U100 Performance parameters

Dc operating parameters at VCC = 3.3V (unless otherwise specified), TA=-40°C ~125°C



ParameterSymbolConditionMinTyp.MaxUnit
Nominal parameter





Primary current measurement rangeIP
0
100A
Sensor sensitivitySensTA@VCC=3.3V
24.7
mV/A
Precision parameter





Sensitivity errorESens@TA=25°C;VCC=3.3V-1
1%
Zero offset voltage
IP=0A，TA=25°C-4±34mV

VOEIP=0A，TA=-40°C ~125°C-20±820mV
Zero magnetic offset current
IP=0A, TA=25°C, after excursion of


mA

IOM100A
100150
Zero offset currentIOFFSETTA=25°C-
0.25A
Linearity errorLinERROf full rang-10.51%
Total output errorETOT(HT)Full scale of IP, TA=25°C~125°C-2
2%

ETOT(LT)Full scale of IP, TA=–40°C~25°C-2
2%


B050 Performance parameters

Dc operating parameters at VCC = 3.3V (unless otherwise specified), TA=-40°C ~125°C



ParameterSymbolConditionMinTyp.MaxUnit
Nominal parameter





Primary current measurement rangeIP
-50
50A
Sensor sensitivitySensTA@VCC=3.3V
26.4
mV/A
Precision parameter





Sensitivity errorESens@TA=25°C;VCC=3.3V-1
1%
Zero offset voltage
IP=0A，TA=25°C-4±34mV

VOEIP=0A，TA=-40°C ~125°C-20±820mV
Zero magnetic offset current
IP=0A, TA=25°C, after excursion of


mA

IOM50A
160320
Zero offset currentIOFFSETTA=25°C

0.3A
Linearity errorLinERROf full rang-10.51%
Total output errorETOT(HT)Full scale of IP, TA=25°C~125°C-2
2%

ETOT(LT)Full scale of IP, TA=–40°C~25°C-2
2%


B150 Performance parameters

Dc operating parameters at VCC = 3.3V (unless otherwise specified), TA=-40°C ~105°C



ParameterSymbolConditionMinTyp.MaxUnit
Nominal parameter





Primary current measurement rangeIP
-150
150A
Sensor sensitivitySensTA@VCC=3.3V
8.8
mV/A
Precision parameter





Sensitivity errorESens@TA=25°C;VCC=3.3V-1
1%
Zero offset voltage
IP=0A，TA=25°C-4±34mV

VOEIP=0A，TA=-40°C ~105°C-20±820mV
Zero magnetic offset current
IP=0A, TA=25°C, after excursion of


mA

IOM150A
300400
Zero offset currentIOFFSETTA=25°C

0.75A
Linearity errorLinERROf full rang-10.51%
Total output errorETOT(HT)Full scale of IP, TA=25°C~105°C-2
2%

ETOT(LT)Full scale of IP, TA=–40°C~25°C-2
2%


U150 Performance parameters

Dc operating parameters at VCC = 3.3V (unless otherwise specified), TA=-40°C ~105°C



ParameterSymbolConditionMinTyp.MaxUnit
Nominal parameter





Primary current measurement rangeIP
0
150A
Sensor sensitivitySensTA@VCC=3.3V
16.5
mV/A
Precision parameter





Sensitivity errorESens@TA=25°C;VCC=3.3V-1
1%
Zero offset voltage
IP=0A，TA=25°C-4±34mV

VOEIP=0A，TA=-40°C ~105°C-20±820mV
Zero magnetic offset current
IP=0A, TA=25°C, after excursion of


mA

IOM150A
180240
Zero offset currentIOFFSETTA=25°C

0.45A
Linearity errorLinERROf full rang-10.51%
Total output errorETOT(HT)Full scale of IP, TA=25°C~105°C-2
2%

ETOT(LT)Full scale of IP, TA=–40°C~25°C-2
2%


B200 Performance parameters

Dc operating parameters at VCC = 3.3V (unless otherwise specified), TA=-40°C ~85°C



ParameterSymbolConditionMinTyp.MaxUnit
Nominal parameter





Primary current measurement rangeIP
-200
200A
Sensor sensitivitySensTA@VCC=3.3V
6.6
mV/A
Precision parameter





Sensitivity errorESens@TA=25°C;VCC=3.3V-1
1%
Zero offset voltage
IP=0A，TA=25°C-4±34mV

VOEIP=0A，TA=-40°C ~85°C-20±820mV
Zero magnetic offset current
IP=0A, TA=25°C, after excursion of


mA

IOM200A
400500
Zero offset currentIOFFSETTA=25°C

1A
Linearity errorLinERROf full rang-10.51%
Total output errorETOT(HT)Full scale of IP, TA=25°C~85°C-2
2%

ETOT(LT)Full scale of IP, TA=–40°C~25°C-2
2%



U200 Performance parameters

Dc operating parameters at VCC = 3.3V (unless otherwise specified), TA=-40°C ~85°C



ParameterSymbolConditionMinTyp.MaxUnit
Nominal parameter





Primary current measurement rangeIP
0
200A
Sensor sensitivitySensTA@VCC=3.3V
12.4
mV/A
Precision parameter





Sensitivity errorESens@TA=25°C;VCC=3.3V-1
1%
Zero offset voltage
IP=0A，TA=25°C-4±34mV

VOEIP=0A，TA=-40°C ~85°C-20±820mV
Zero magnetic offset current
IP=0A, TA=25°C, after excursion of


mA

IOM200A
200250
Zero offset currentIOFFSETTA=25°C

0.5A
Linearity errorLinERROf full rang-10.51%
Total output errorETOT(HT)Full scale of IP, TA=25°C~85°C-2
2%

ETOT(LT)Full scale of IP, TA=–40°C~25°C-2
2%


B250 Performance parameters

Dc operating parameters at VCC = 3.3V (unless otherwise specified), TA=-40°C ~85°C


ParameterSymbolConditionMinTyp.MaxUnit
Nominal parameter





Primary current measurement rangeIP
-250
250A
Sensor sensitivitySensTA@VCC=3.3V
5.3
mV/A
Precision parameter





Sensitivity errorESens@TA=25°C;VCC=3.3V-1
1%
Zero offset voltage
IP=0A，TA=25°C-4±34mV

VOEIP=0A，TA=-40°C ~85°C-20±820mV
Zero magnetic offset current
IP=0A, TA=25°C, after excursion of


mA

IOM250A
500640
Zero offset currentIOFFSETTA=25°C

1.25A
Linearity errorLinERROf full rang-10.51%
Total output errorETOT(HT)Full scale of IP, TA=25°C~85°C-2
2%

ETOT(LT)Full scale of IP, TA=–40°C~25°C-2
2%


U250 Performance parameters

Dc operating parameters at VCC = 3.3V (unless otherwise specified), TA=-40°C ~85°C



ParameterSymbolConditionMinTyp.MaxUnit
Nominal parameter





Primary current measurement rangeIP
0
250A
Sensor sensitivitySensTA@VCC=3.3V
9.9
mV/A
Precision parameter





Sensitivity errorESens@TA=25°C;VCC=3.3V-1
1%
Zero offset voltage
IP=0A，TA=25°C-4±34mV

VOEIP=0A，TA=-40°C ~85°C-20±820mV
Zero magnetic offset current
IP=0A, TA=25°C, after excursion of


mA

IOM250A
250320
Zero offset currentIOFFSETTA=25°C

0.65A
Linearity errorLinERROf full rang-10.51%
Total output errorETOT(HT)Full scale of IP, TA=25°C~85°C-2
2%

ETOT(LT)Full scale of IP, TA=–40°C~25°C-2
2%


Ordering information:


TypeZero point voltage VOUT(Q) (V)Primary current rangeIP (A)sensitivity Sens(Typ.)(mV/A)Encapsulation formMPQ(PCS)MOQ(PCS)
RCT050BR-3VCC/2±50



RCT050BF-31.65
26.4PFF, PSF PSS, SMT40400
RCT050UF-30.55049.4
40400
RCT100BR-3VCC/2




RCT100BF-31.65±10013.2PFF, PSF PSS, SMT40400
RCT100UF-30.510024.7
40400
RCT150BR-3VCC/2




RCT150BF-31.65± 1508.8PFF, PSF PSS, SMT40400
RCT150UF-30.515016.5
40400
RCT200BR-3VCC/2




RCT200BF-31.65±2006.6PFF, PSF PSS, SMT40400
RCT200UF-30.520012.4
40400
RCT250BR-3VCC/2




RCT250BF-31.65±2505.3PFF, PSF PSS, SMT40400
RCT250UF-30.52509.9
40400


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