NCP1351
V cc
ICC1
Pulldown
SCR action
Latched
state
User
reset
Vcc ON
Vcc stop
V zener
P out
I FB
V timer
overload
P out >50%
P out >50%
overload
ICC < 20 μ A
100% P out
50% P out
51 μ A
V timer
startup
DRV
C version, latched dual OCP level
Figure 22. The C Version Latches if the Power Excursion Exceeds 50% of the Maximum Power Too Long
(DCM Full Load Operation)
V cc
Vcc ON
Pulses
P out
ICC1
stopped
ICC4
Vcc stop
V zener
100% P out
I FB
V timer
overload
P out >50%
P out >50%
overload
50% P out
51 μ A
V timer
startup
DRV
D version, auto-recovery dual OCP level
Figure 23. The D Version Enters Auto-Recovery Burst Mode if the Power Excursion Exceeds 50% of the
Maximum Power (DCM Full Load Operation)
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