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NCP1217, NCP1217A
Vcc 5 V/DIV
Vlatch 1 V/DIV
Time 10 ms/DIV
Figure 27. A Negative Spike Takes Place on the Bulk Capacitor at the Switch--Off Sequence
Simple and inexpensive cures exist to prevent from
internal parasitic SCR activation. One of them consists in
inserting a resistor in series with the high--voltage pin to
keep the negative current to the lowest when the bulk
becomes negative (Figure 28). Please note that the negative
spike is clamped to (--2*Vf) thanks to the diode bridge. Also,
the power dissipation of this resistor is extremely small since
it only heats up during the startup sequence.
3
Rbulk
> 4.7 k
Another option (Figure 29) consists in wiring a diode
from V CC to the bulk capacitor to force V CC to reach
VCC ON sooner and thus stops the switching activity before
the bulk capacitor gets deeply discharged. For security
reasons, two diodes can be connected in series.
+
Cbulk
1
2
8
7
2
+
Cbulk
1
2
8
7
3
D3
1N4007
3
6
1
3
6
1
4
5
+
CV CC
4
5
+
CV CC
Figure 28. A simple resistor in series avoids any
latch--up in the controller . . .
Figure 29. . . . or one diode forces V CC to reach
VCC ON sooner.
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