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PASSIVE CURRENT SENSORS FOR OPERATION WITH THE IC DRV 401

VAC offers a wide range of current sensors for DC and AC measurement in PCB and panel mount versions.

All VAC sensors offer the detection of high continuous and peak currents in compact package sizes. Our current sensors are used in many different customer applications, the most typical being:

- Variable speed drives
- Photovoltaic inverters
- Wind power converters
- Welding inverters
- Switched mode power supplies
- Uninterruptible power supplies

The VAC - invented principle of a closed loop current sensor with a magnetic probe (aka flux gate probe) as the zero field detector is distinguished by maximum precision of the current detection.

The electronics for passive VAC current sensors is built up outside the sensor. However, since it is mainly concentrated the application specific IC DRV401, only a small number of components are required on the application’s PCB and the circuit design is quite easy for a +5V –supplied current sensor with a voltage output. Hence more electrical and mechanical freedom of design and a number of supplemental functions of the IC can be used:

- start a demagnetization cycle of the sensor magnetic core at any time to optimize the output signal offset, e.g. at power-up or after a short circuit induced overcurrent.
- indicate errors such as wire breaks or shorts in the sensor module as well as a supply voltage brownout.
- indicate overcurrent without consulting the analog output signal.
- adapt the output voltage level by free choice of the measuring resistor value (not possible with integrated sensors).
- place the sensor control electronics close to the A/D converter and thus at a distance to the sensors module for better EMC compliance.

VAC Evaluation kits

VAC offers evaluation kits for design engineers. The kits include the evaluation board and a compatible current sensor.

9800 03073 (for sensor types 4645-X030 / -X060)
9800 03074 (for sensor types 4645-X100 / -X600 / -X601)
9800 03075 (for sensor types 4645-X400 / -X410 / -X080)

More information is available in our brochure Passive current sensors for the operation with the IC DRV 401, in our paper Applicational hints to the IC DRV401 and in the current sensor datasheets linked below.

The data sheet and further information to the IC DRV401 can be found under http://focus.ti.com/docs/prod/folders/print/drv401.html

VAC-product

IPN

lP,max

{RM}

TA

KN

f

X

Primary
connection

Secondary
connection

Assembly

 

A

A

Ω

°C

 

kHz

%

 

 

 

T60404-M4645-X010

40

+/- 55

3.91

-40..+85

(1..6) : 1000

DC..100

0.5

pins

pins

encapsulated

T60404-M4645-X211

50

+/- 150

1.25

-40..+85

(1..5) : 1000

DC..100

0.5

pins

pins

encapsulated

T60404-M4645-X030

100

+/- 125

1.56

-40..+85

(1..4) : 1000

DC..100

0.5

pins

pins

encapsulated

T60404-M4645-X060

100

+/- 160

1.56

-40..+85

1 : 1000

DC..100

0.5

centre hole
for cable

pins

encapsulated

T60404-M4645-X080

100

+/- 300

1.56

-40..+85

1 : 2000

DC..100

0.5

centre hole
for cable

pins

encapsulated

Further current sensor-types, e.g. for higher currents and with integrated electronics or all-current sensitive differential current sensors, can be found here:

Active Current Sensors for Maximum Accuracy
All-Current Sensitive Differential Current Sensors

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Last update: 16.02.2018