Datasheet ACS37612 (Allegro) - 18
| Manufacturer | Allegro |
| Description | Coreless, High Precision, Hall-Effect Current Sensor IC with Common-Mode Field Rejection and High Bandwidth (240 kHz) |
| Pages / Page | 22 / 18 — Coreless, High Precision, Hall-Effect Current Sensor IC. ACS37612 |
| File Format / Size | PDF / 2.3 Mb |
| Document Language | English |
Coreless, High Precision, Hall-Effect Current Sensor IC. ACS37612
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Coreless, High Precision, Hall-Effect Current Sensor IC ACS37612 with Common-Mode Field Rejection and High Bandwidth (240 kHz) APPLICATION INFORMATION Typical Application – Busbar Sensing Figure 18: Busbar current sensing application – reference busbar design
The ACS37612 is ideal for busbar current sensing applications. evaluation board designed to measure ±1000 A. For a given current flowing through the busbar, the magnitude of Note: Comparing the busbar described in Figure 18 to a bare bus- the differential magnetic field sensed by the IC will depend on bar (without notch), the busbar with the 3 mm notch increased the the air gap between the busbar and the IC. overall impedance by less than 1 µΩ, increasing busbar tempera- Adding a notch (width reduction) to the busbar at the location ture by only few degrees during testing. where the sensor is placed significantly increases the magnitude
Skin Effect Consideration
of the magnetic field, improving SNR. Keeping the notch length short (2 to 3 mm) results in virtually no increase in the resistance Skin effect in the conductor will tend to reduce the magnitude of the busbar or degradation of its thermal performance. of the differential magnetic field measured by the IC at high frequencies (coupling factor) and therefore will influence the Different busbar and notch dimensions can be used to optimize bandwith of the system and response time to transient current. system performance and respond to application constraints. Skin effect will depend on busbar dimensions, sensor mounting Figure 18 and Table 1 highlight the dimensions of an Allegro orientation, and distance between the busbar and the IC.
Table 1: Current range based on reference busbar design: Busbar Application Maximum Current (A) Coupling Factor at 2.5 mm Crystal Air Gap [1] Differential Field (G) IC Sensitivity (mV/G)
18 × 3 mm Busbar + 3 mm Notch ±1000 0.19 ±190 10 [1] Crystal air gap is defined as the distance from the busbar surface to the device sensing elements (considering active area depth). 18 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com
Coreless, High Precision, Hall-Effect Current Sensor IC ACS37612 with Common-Mode Field Rejection and High Bandwidth (240 kHz) APPLICATION INFORMATION Typical Application – Busbar Sensing Figure 18: Busbar current sensing application – reference busbar design
The ACS37612 is ideal for busbar current sensing applications. evaluation board designed to measure ±1000 A. For a given current flowing through the busbar, the magnitude of Note: Comparing the busbar described in Figure 18 to a bare bus- the differential magnetic field sensed by the IC will depend on bar (without notch), the busbar with the 3 mm notch increased the the air gap between the busbar and the IC. overall impedance by less than 1 µΩ, increasing busbar tempera- Adding a notch (width reduction) to the busbar at the location ture by only few degrees during testing. where the sensor is placed significantly increases the magnitude
Skin Effect Consideration
of the magnetic field, improving SNR. Keeping the notch length short (2 to 3 mm) results in virtually no increase in the resistance Skin effect in the conductor will tend to reduce the magnitude of the busbar or degradation of its thermal performance. of the differential magnetic field measured by the IC at high frequencies (coupling factor) and therefore will influence the Different busbar and notch dimensions can be used to optimize bandwith of the system and response time to transient current. system performance and respond to application constraints. Skin effect will depend on busbar dimensions, sensor mounting Figure 18 and Table 1 highlight the dimensions of an Allegro orientation, and distance between the busbar and the IC.
Table 1: Current range based on reference busbar design: Busbar Application Maximum Current (A) Coupling Factor at 2.5 mm Crystal Air Gap [1] Differential Field (G) IC Sensitivity (mV/G)
18 × 3 mm Busbar + 3 mm Notch ±1000 0.19 ±190 10 [1] Crystal air gap is defined as the distance from the busbar surface to the device sensing elements (considering active area depth). 18 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com
