Datasheet

NCP1351
http://onsemi.com
18
Vcc
ON
Vcc
stop
V
cc
P
out
V
timer
overload
V
timer
DRV
V
zener
startup
51 μA
I
FB
100% P
out
50% P
out
overload
P
out
>50%
P
out
>50%
User
reset
ICC < 20 μA
Latched
state
ICC1
Pulldown
SCR action
Vcc
ON
Vcc
stop
V
cc
P
out
V
timer
overload
V
timer
DRV
V
zener
startup
C version, latched dual OCP level
μA
I
FB
100% P
out
50% P
out
overload
P
out
>50%
P
out
>50%
User
reset
ICC < 20 μA
Latched
state
ICC1
Pulldown
SCR action
Figure 22. The C Version Latches if the Power Excursion Exceeds 50% of the Maximum Power Too Long
(DCM Full Load Operation)
Vcc
ON
Vcc
stop
V
cc
P
out
V
timer
overload
V
timer
DRV
V
zener
startup
D version, auto-recovery dual OCP level
51 μA
I
FB
100% P
out
50% P
out
overload
P
out
>50%
P
out
>50%
Pulses
stopped
ICC1
ICC4
Vcc
ON
Vcc
stop
V
cc
P
out
V
timer
overload
V
timer
DRV
V
zener
startup
μA
I
FB
100% P
out
50% P
out
overload
P
out
>50%
P
out
>50%
Pulses
stopped
ICC1
ICC4
Figure 23. The D Version Enters Auto-Recovery Burst Mode if the Power Excursion Exceeds 50% of the
Maximum Power (DCM Full Load Operation)