NCP1219 ONSEMI [ON Semiconductor], NCP1219 Datasheet - Page 3

• Manufacturer Part Number: NCP1219
• Description: PWM Controller with Adjustable Skip Level and External Latch Input
• Manufacturer: ONSEMI [ON Semiconductor]

R
skip
Skip/latch
R
R
CS
ramp
GND
CS
FB
CS
* Typical values are shown
V
V
I
FB
ramp(peak)
CS
R
42.0k*
51.3k*
R
V
upper
lower
I
FB(open)
ramp
16.7k*
2 V
0
V
V
FB
DD
/ 3
V
latch
Figure 2. Functional Block Diagram
+
-
V
Skip
LEB
clamp
detect
V
http://onsemi.com
50 ms *
V
Soft−Start/PWM Clamp
filter
Skip(max)
7.5%* Jittering
Skip/latch
Oscillator
Duty Ratio
t
Maximum
SSTART
PWM
latch−off, reset when
+
reset
-
timer
detect
Latched overload
V
3
CC
tOVLD
(Option A)
V
< V
time
ILIM
(Option A)
Skip
Comparator
CC(reset)
+
-
soft−
start
set
S Q
R
R
S
Double Hiccup
Management
75 ms*
TSD
filter
Q
Counter
internal
disable
I
I
Fault
start
inhibit
bias
when V
Normal = V
Fault = V
when V
S Q
R
CC
CC
V
CC(hiccup)
V
+
+
-
-
> V
CC(reset)
CC(on)
CC(min)
< V
+
UVLO
+
−
-
inhibit
inhibit
V
CC
V
DRV
HV
CC