starts the cycle after the 4V threshold is exceeded. The ERROR flag resets to H after the cycle is completed.

d) Abort of demagnetization cycle. The ERROR flag resets to H (as shown) and the output settles back to normal operation.

b) Power-up without demagnetization. The probe oscillation V(IS1)

starts just before ERROR resets — 15

µs after the supply voltage

crosses the 4V threshold.

c) Demagnetization cycle on command.

20ms/div

1

4

2

3

R

V

DD1

V(I

V

OUT

V(ERROR)

106ms

20ms/div

1

4

V

DD1

V(ERROR)

2

V(IS1)

3

V(I

42

µs

Initial setting upon

closing of feedback loop.

20ms/div

1

4

2

3

V(DEMAG)

V(I

V

OUT

V(ERROR)

106ms

R

500

µs/div

1

4

2

3

R

V(DEMAG)

V(I

V

OUT

V(ERROR)

3.4ms

DRV401-EP

Figure 7. Demagnetization and Power-On Timing

22

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