DRV401-Q1 Datasheet, PDF (16/39 Pages) Texas Instruments – DRV401-Q1 Sensor Signal Conditioning Device for Closed-Loop Magnetic Current Sensor

DRV401-Q1
SBOS814 – DECEMBER 2016
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Feature Description (continued)
Without external magnetic influence, the duty cycle is exactly 50% because of the inherent symmetry of the
magnetic hysteresis; the probe inductor is driven from −B saturation through the high inductance range to +B
saturation and back again in a time-symmetric manner, as shown in Figure 37.
B
H
V (IS1)
V (PWM)/10
500 ns/div
Without an external magnetic field, the hysteresis curve is symmetrical and the probe loop generates 50% duty cycle.
Figure 37. Magnetic Probe, Hysteresis, and Duty Cycle: No External Magnetic Field
16
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