DRV401-EP Datasheet, PDF (15/33 Pages) Texas Instruments – SENSOR SIGNAL CONDITIONING IC FOR CLOSED-LOOP MAGNETIC CURRENT SENSOR

DRV401-EP
www.ti.com............................................................................................................................................................................................... SBVS104 – JANUARY 2008
Probe
55Ω
55Ω
IS2
IS1
V_DD1
18Ω
CMP
PWM
V_REF = 0.5V
NOTE: MOS components function as switches only.
a) Simplified probe interface circuit.
The probe is connected between S1 and S2.
B
B
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
(I_PRIM) 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
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