DRV401-Q1 Datasheet, PDF (28/39 Pages) Texas Instruments – DRV401-Q1 Sensor Signal Conditioning Device for Closed-Loop Magnetic Current Sensor

DRV401-Q1
SBOS814 – DECEMBER 2016
www.ti.com
9 Power Supply Recommendations
The DRV401-Q operates from a single power supply, nominally 5 V, and must remain between 4.5 V and 5.5 V
for normal operation. See Figure 46, Figure 47, Figure 48, and Figure 49 for device power-on behavior.
V_DD1
1
4
2
106 ms
V(ERROR)
V(I_COMP2)
R_SH = 10 W
V_OUT
3
20 ms/div
With power-up, the V_OUT across the compensation coil centers around half the supply and then starts the cycle after
the 4-V threshold is exceeded. The ERROR flag resets to H after the cycle is completed.
Figure 46. Demagnetization and Power-On Timing: Demagnetization Cycle on Power-Up
V_DD1
42 ms
1
V(ERROR)
4
V(IS1)
2
3
V(I_COMP2)
Initial setting upon
closing of feedback loop.
20 ms/div
The probe oscillation V(IS1) starts just before ERROR resets—15 μs after the supply voltage crosses the 4-V
threshold.
Figure 47. Demagnetization and Power-On Timing: Power-Up Without Demagnetization
V(DEMAG)
1
106 ms
V(ERROR)
4
V(I_COMP2)
2
R_SH = 10 W
V_OUT
3
20 ms/div
Figure 48. Demagnetization and Power-On Timing: Demagnetization Cycle On Command
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