NCP1381 ONSEMI [ON Semiconductor], NCP1381 Datasheet - Page 21

• Manufacturer Part Number: NCP1381
• Description: Low−Standby High Performance PWM Controller
• Manufacturer: ONSEMI [ON Semiconductor]

short−circuit, is the lack of latch−off phase in brown−out conditions: V
in BO, whereas it goes down to 7 V and up to 15 V in short−circuit conditions. Figure 36 shows how V
short−circuit is detected. In BO conditions, the PFC is disabled as in UVLO conditions.
Figure 32 also includes the short−circuit latch−off phase generation. The difference between behaviors in BO or
Fault
+
R
CV
11
startup
8
CC
I
CC3
+
+
VCC
VCC
VCC
VCC
V
+
−
+
−
bulk
ON
latch
ON
OFF
S
R
Q
Q
Activated During Fault Only
S&R are Positive
Edge Triggered
Figure 32. The Internal Brown−out Circuit
Shot
One
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NCP1381
Fault
21
+
−
CC
OK to
Pulse
+
ramps up and down between VCC
2
8
S
R
Reset
Shot
One
Q
Q
I
P
GTS
Simplified Timer for
B
SS
Flag
OK
and Fault Only
V
+
−
CC
DD
ON
moves when a
and VCC
4
C
timer
OFF