Datasheet

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SBVS070B − JUNE 2006 − REVISED MAY 2009
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20
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.
d) Abort of demagnetization cycle. The ERROR flag resets to H (as shown) and the output settles back to normal opera-
tion.
b) Power-up without demagnetization. The probe oscillation V(IS1)
starts just before ERROR resets—15µs after the supply voltage cross-
es the 4V threshold.
c) Demagnetization cycle on command.
20ms/div
5V/div
1
4
2
3
2V/div
R
SH
=10
Ω
V
DD1
V(I
COMP2
)
V
OUT
V(ERROR)
106ms
20ms/div
5V/div
1
4
2V/div
V
DD1
V(ERROR)
2
V(IS1)
3
V(I
COMP2
)
42
µ
s
Initial setting upon
closing of feedback loop.
20ms/div
5V/div
1
4
2
3
2V/div
V(DEMAG)
V(I
COMP2
)
V
OUT
V(ERROR)
106ms
R
SH
=10
Ω
500
µ
s/div
5V/div
1
4
2
3
2V/div
R
SH
=10
Ω
V(DEMAG)
V(I
COMP2
)
V
OUT
V(ERROR)
3.4ms
Figure 7. Demagnetization and Power-On Timing