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NCP1250ASN65T1G Datasheet(PDF) 3 Page - ON Semiconductor

Part # NCP1250ASN65T1G
Description  Current-Mode PWM Controller for Off-line Power Supplies
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1250ASN65T1G Datasheet(HTML) 3 Page - ON Semiconductor

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NCP1250
http://onsemi.com
3
Figure 2. Internal Circuit Architecture
S
R
Q
Q
65
100 kHz
clock
vdd
Frequency
modulation
Drv
Vcc and logic
management
vdd
power
on reset
Rramp
LEB
vdd
RFB
/ 4.2
IpFlag
4 ms
SS
Power on
reset
IpFlag
GND
CS
FB
600−ns time
constant
OPP
Frequency
foldback
Vskip
Vlatch
The soft−start is activated during:
− the startup sequence
− the auto−recovery burst mode
+
Vlimit
VOPP
Vlimit + VOPP
Vfold
S
R
Q
Q
Clamp
1−us
blanking
Up counter
4
hiccup
RST
OVP
gone?
250 mV
peak current
freeze
VFB < 1.05 V ? setpoint = 250 mV
UVLO
Rlim
Iscr
Vcc


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