NCP1254 View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
NCP1254
ON Semiconductor
NCP1254 Datasheet PDF : 25 Pages
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OPP
Vlatch
NCP1254
600−ns time
constant
OVP
gone?
Up counter
RST
4
S
Q
Q
R
Power on
reset
Jitter mod.
Vcc and logic
management
UVLO
double hiccup
Vdd power
on reset
100% to
25% change
VOVP
SC
Vcc
option
20 ms latch/AR
1−ms
blanking
65 kHz
clock
Rlimit
Vcc
Vref
Clamp
S
Q
Q
R
Frequency
increase to
130 kHz
Frequency
foldback
IpFlag,
PON reset
Vcc
Drv
VFswp
Vskip
Vfold
vdd
RFB
/4
FB
CS
VSC
LEB
Rramp
SC
4 ms
SS
The soft−start is
activated during:
Ip flag
− the startup sequence
− the auto−recovery burst mode
VFB < 1 V ? setpoint = 250 mV
VOPP
250 mV
peak current
freeze
Vlimit + VOPP
+
Vlimit
Figure 2. Internal Circuit Architecture
GND
http://onsemi.com
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