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NCP1253
Current-Mode PWM Controller for Off-line Power Supplies
ON Semiconductor
NCP1253 Datasheet PDF : 15 Pages
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NCP1253
IpFlag BO
Vcc logic
management
and fault timer
UVLO
vdd
power
on reset
20us time
constant
VOVP
S
Q
Q
Rlim
vdd
R
Power on
Frequency
modulation
reset
65 kHz
100 kHz
clock
S
Q
Q
Clamp
R
Frequency
foldback
Vfold
Vskip
VDD
RFB
FB
/ 4.2
CS
Rramp
The soft
−
start is activated during:
−
the startup sequence
−
the auto
−
recovery burst mode
4 ms
SS
IpFlag
Vlimit
VFB < 1.05 V ? setpoint = 250 mV
LEB
250 mV
peak current
freeze
Figure 2. Internal Circuit Architecture
Vcc
Drv
GND
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