NCP1239
bulk
+
VBulk
Bload
Current
V(CMP) > 3, 35/V (bulk) : 0
2
3
Cbulk
B1
V(line)*V(timing)
47uF
Vline
IN
Voltage
IC = 40
−
PSpice:
EBload Value = { IF ( V(CMP)>3, 35/V(bulk), 0) }
bulk
line
timing
Rupper
2.4Meg
cmp
+
−
V1
V2
BrownOut
5
Cfil
Rlower
10k
Bbrown
Voltage
V(CMP) > 3, 250m : 500m
220n
PSpice:
EBbrown Value = { IF ( V(CMP) > 3, 250m, 0) }
V2 timing 0 PWL 0 0.2 3s 1 7s 1 10s 0.2
V1 line 0 SIN 0 150 50
A simple simulation configuration helps to tailor the right value for Cfil
Figure 46.
Turn−off voltage occurs at:
VinRMS = 72.3 volts
200 16.0
100 12.0
0
−100
−200
8.0
4.0
0
Vbrown−out
8.156
8.175
8.195
8.215
8.235
Typical signals obtained from the simulator
Figure 47.
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