Datasheet ACS37612 (Allegro) - 20
| 制造商 | Allegro |
| 描述 | Coreless, High Precision, Hall-Effect Current Sensor IC with Common-Mode Field Rejection and High Bandwidth (240 kHz) |
| 页数 / 页 | 22 / 20 — Coreless, High Precision, Hall-Effect Current Sensor IC. ACS37612 |
| 文件格式/大小 | PDF / 2.3 Mb |
| 文件语言 | 英语 |
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) Typical Application – PCB Sensing Figure 23: PCB Current sensing application – 6-Layer reference PCB example
The ACS37612 can be used in applications where hundreds of Care must be taken when routing the device signal to prevent amps flow through a PCB. noise coupling to the supply or output lines. Multiple copper layers can be used to carry the current. Reduc- Power plane in the neckdown area should also be avoided to ing the width of the copper traces under the sensor (neckdown) prevent disturbing the magnetic field measured. increases the magnitude of the differential magnetic field mea- sured by the IC.
Skin Effect Consideration
Different copper layer dimensions and stackups can be used to Skin effect in the conductor will tend to reduce the magnitude optimize performance and respond to application constraints. For example, in higher voltage applications, the top layer would only of the differential magnetic field measured by the IC at high be used for signal routing in order to use the PCB insulation for frequencies (coupling factor) and therefore will influence the isolation. bandwith of the system and response time to transient current. Figure 23 and Table 2 highlight the dimensions of three Allegro Skin effect will depend on PCB copper trace dimensions, number evaluation boards designed to measure a wide current range. of layers, and layer thickness.
Table 2: Current range based on reference PCB design: PCB Application [1] Maximum Current (A) [2] Coupling Factor (G/A) Differential Field (G) IC Sensitivity (mV/G)
5 Layers – Reference Design 3.5 mm – 015B5 ±190 0.74 ±133 15 5 Layers – Reference Design 3.5 mm – 010B5 ±270 0.74 ±200 10 5 Layers – Reference Design 4.5 mm – 015B5 ±235 0.57 ±133 15 5 Layers – Reference Design 4.5 mm – 010B5 ±350 0.57 ±200 10 5 Layers – Reference Design 7 mm – 015B5 ±500 0.265 ±133 15 5 Layers – Reference Design 7 mm – 010B5 ±750 0.265 ±200 10 [1] Maximum continuous current without proper cooling on these PCB designs should not exceed 200 A. [2] Full-scale current is required to cover the full-scale output range (bidirectional = ±2 V). 20 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) Typical Application – PCB Sensing Figure 23: PCB Current sensing application – 6-Layer reference PCB example
The ACS37612 can be used in applications where hundreds of Care must be taken when routing the device signal to prevent amps flow through a PCB. noise coupling to the supply or output lines. Multiple copper layers can be used to carry the current. Reduc- Power plane in the neckdown area should also be avoided to ing the width of the copper traces under the sensor (neckdown) prevent disturbing the magnetic field measured. increases the magnitude of the differential magnetic field mea- sured by the IC.
Skin Effect Consideration
Different copper layer dimensions and stackups can be used to Skin effect in the conductor will tend to reduce the magnitude optimize performance and respond to application constraints. For example, in higher voltage applications, the top layer would only of the differential magnetic field measured by the IC at high be used for signal routing in order to use the PCB insulation for frequencies (coupling factor) and therefore will influence the isolation. bandwith of the system and response time to transient current. Figure 23 and Table 2 highlight the dimensions of three Allegro Skin effect will depend on PCB copper trace dimensions, number evaluation boards designed to measure a wide current range. of layers, and layer thickness.
Table 2: Current range based on reference PCB design: PCB Application [1] Maximum Current (A) [2] Coupling Factor (G/A) Differential Field (G) IC Sensitivity (mV/G)
5 Layers – Reference Design 3.5 mm – 015B5 ±190 0.74 ±133 15 5 Layers – Reference Design 3.5 mm – 010B5 ±270 0.74 ±200 10 5 Layers – Reference Design 4.5 mm – 015B5 ±235 0.57 ±133 15 5 Layers – Reference Design 4.5 mm – 010B5 ±350 0.57 ±200 10 5 Layers – Reference Design 7 mm – 015B5 ±500 0.265 ±133 15 5 Layers – Reference Design 7 mm – 010B5 ±750 0.265 ±200 10 [1] Maximum continuous current without proper cooling on these PCB designs should not exceed 200 A. [2] Full-scale current is required to cover the full-scale output range (bidirectional = ±2 V). 20 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com