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NCP1253 Datasheet(PDF) 3 Page - ON Semiconductor

Part # NCP1253
Description  Current-Mode PWM Controller for Off-line Power Supplie
PDF  15 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1253 Datasheet(HTML) 3 Page - ON Semiconductor

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NCP1253
www.onsemi.com
3
S
R
Q
Q
65 kHz
100 kHz
clock
vdd
Frequency
modulation
Vcc
Drv
Vcc logic
management
and fault timer
vdd
power
on reset
Rramp
LEB
VDD
RFB
/ 4.2
IpFlag
4 ms
SS
IpFlag
GND
CS
FB
Frequency
foldback
Vskip
The soft−start is activated during:
− the startup sequence
− the auto−recovery burst mode
Vlimit
Vfold
Clamp
20us time
constant
VOVP
VFB < 1.05 V ? setpoint = 250 mV
250 mV
peak current
freeze
UVLO
BO
Power on
reset
S
R
Q
Q
Rlim
Figure 2. Internal Circuit Architecture



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