LINEAR HALL-EFFECT SENSORS

VHELCS-XX

Vertical Hall-Effect Linear Current Sensors

- Output voltage is isolated from the input
- Ratiometric rail-to-rail linear output
- Senses DC or AC current
- Excellent temperature stability
- Operation -40 to +125°C

DESIGN NOTES

The current sensors described in this brochure are manufactured of the highest quality raw materials utilizing gapped ferrite cores and linear hall effect sensors. These current sensors can sense either DC or AC current while the linear output voltage tracks the sensed current waveform. When sensing zero current, the output voltage is equal to one-half of the supply voltage. Current flow can be sensed in both directions. Positive conventional current flow results in an increase in output voltage while negative current flow results in a decrease in output voltage. The output voltage is ratiometric to the supply voltage and is linear over the output voltage range of .2 volts to (Vcc -.2 volts).

These current sensors are designed to provide accuracy and versatility for applications in automobile and transportation diagnostics, power supplies, motor controls, overload protection circuits, and energy management systems. They are provided as rectangular vertical standing units to minimize mounting space. They are designed for printed circuit board applications and incorporate standoff feet on the toroid carrier to allow solder fillet formation and flush cleaning of solder-flux residue from under the component after the soldering operation.

These current sensors are designed and manufactured in the smallest possible package sizes. The toroid and sensor are secured to the housing with epoxy resin. Leads are tin-plated per MIL-P-81728, semi-bright. Carrier material is a liquid crystal polymer, (LCP) plastic. LCP can be used continuously at 280°C (536°F), has a melt point of 335°C (635°F), is inherently flame retardant and meets the flammability requirements of UL 94V-0.

These current sensors are designed for -40 to +125°C operation. Current sensors are capable of withstanding 500 V DC @ 50 microamps applied between the sensor coil and the case.

The current to be sensed is applied to the sensor coil leads which are marked with a "+" and a "-" on the front of the case. A dot on the front of the case designates the output voltage lead. The two leads next to the output voltage lead are the common lead (next to the output voltage lead) and the supply voltage lead. The VHELCS-100 does not have a sensor coil. A single wire passed through the center of the core provides a single turn coil with a peak sensed current of 100 amps and a sensitivity of 45mV/amp. Passing the wire through the center of the core a second time reduces the peak sensed current to 50 amps and increases the sensitivity to 90mV/amp. A third pass gives a peak sensed current of 33 1/3 amps and a sensitivity of 135mV/amp, etc. The VHELCS-100 is provided with two 8-32 mounting studs in place of the sensor coil leads.

Marking consists of manufacturer's logo (EC²), part number, terminal identification and date code of manufacture. All marking is applied by silk-screen process using blue epoxy paint in accordance with MIL-STD-130, to meet the permanency of identification required by MIL-STD-202, Method 215.

OPERATING SPECIFICATIONS

Supply Voltage (Vcc)...............4.5 to 10.5 Vdc
Supply current @ 5V, 25°C..........7mA typ., 8.5mA max.
Offset Voltage @ 0 amps............(Vcc/2) ±3%
Offset Shift.......................±0.06%/°C
Frequency Response (Vcc = +10Vdc)..Flat to 20kHz
Sensitivity Tolerance..............±10%
Output Linearity...................1% typical
                      

PART NUMBER TABLE

ÆSensitivity measured at Vcc = +10 V dc.