DRV401-EP_09 Datasheet, PDF (22/33 Pages) Texas Instruments – SENSOR SIGNAL CONDITIONING IC FOR SENSOR SIGNAL CONDITIONING IC FOR

DRV401-EP
SBVS104B – JANUARY 2008 – REVISED MARCH 2009 .................................................................................................................................................. www.ti.com
V_DD1
1
4
2
106ms
V(ERROR)
V(I_COMP2)
R_SH = 10Ω
V_OUT
3
20ms/div
a) Demagnetization cycle on power-up. With power-up, the V_OUT across the compensation coil centers around half the supply and then
starts the cycle after the 4V threshold is exceeded. The ERROR flag resets to H after the cycle is completed.
V_DD1
42µs
1
V(ERROR)
4
V(IS1)
2
3
V(I_COMP2)
Initial setting upon
closing of feedback loop.
V(DEMAG)
1
106ms
V(ERROR)
4
V(I_COMP2)
2
R_SH = 10Ω
V_OUT
3
20ms/div
b) Power-up without demagnetization. The probe oscillation V(IS1)
starts just before ERROR resets — 15µs after the supply voltage
crosses the 4V threshold.
20ms/div
c) Demagnetization cycle on command.
V(DEMAG)
1
V(ERROR)
4
V(I_COMP2)
2
3.4ms
V_OUT
3
500µs/div
R_SH = 10Ω
d) Abort of demagnetization cycle. The ERROR flag resets to H (as shown) and the output settles back to normal operation.
Figure 7. Demagnetization and Power-On Timing
22
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