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| DRV401 Datasheet, PDF (14/28 Pages) Burr-Brown (TI) – Sensor Signal Conditioning IC for Closed-Loop Magnetic Current Sensor | |||
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DRV401
SBVS070A â JUNE 2006 â REVISED OCTOBER 2006
Probe
55â¦
55â¦
IS2
IS1
VDD1
18â¦
CMP
PWM
VREF = 0.5V
NOTE: MOS components function as switches only.
a) Simplified probe interface circuit.
The probe is connected between S1 and S2.
B
B
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H
V (IS1)
H
V (IS1)
V (PWM)/10
V (PWM)/10
500ns/div
b) Without an external magnetic field, the hysteresis curve is
symmetrical and the probe loop generates 50% duty cycle.
500ns/div
c) An external magnetic flux (H) generated from the primary current
(IPRIM) shifts the hysteresis curve of the magnetic field probe in the
H-axis and the probe loop generates a nonsymmetrical duty cycle.
Figure 2. Magnetic Probe, Hysteresis, and Duty Cycle
14
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