ncp1652 ON Semiconductor, ncp1652 Datasheet - Page 31

• Manufacturer Part Number: ncp1652
• Description: Power Factor Controllers
• Manufacturer: ON Semiconductor

Latch Input
the controller during overtemperature and overvoltage
faults (See Figure 69). The controller is latched if the
Latch−Off pin voltage is pulled below 1 V or above 6.5 V.
The NCP1652 has a dedicated latch input to easily latch
Vaux or VCC
NTC
Latch−Off
Figure 68. Relationship Between the Brown−Out, V
I
V
latch(clamp)
latch(clamp)
VDD
V
I latch(shdn)
V
V
V
BO(high)
BO(low)
CC(on)
CC(off)
OUTA
OUTB
V
V
CC
FF
Brown−Out
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Figure 69.
+
+
OTP comparator
OVP comparator
31
V
V
latch(high)
latch(low)
+
−
−
+
Last OUTB Pulase
Once the controller is latched, OUTA is disabled and OUTB
generates a final pulse that ends with the oscillator period.
No more pulses are generated after OUTB is terminated.
Figure 70 shows the relationship between the Latch−Off,
V
CC
, OUTA and OUTB signals.
CC
t
t
t
t
, OUTA and OUTB
Reset
t
latch(delay)
blanking
S
R
Q
Latch