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NCP1237 데이터시트(PDF) 3 Page - ON Semiconductor

부품명 NCP1237
상세설명  Fixed Frequency Current Mode Controller for Flyback Converters
PDF  34 Pages
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제조업체  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1237 데이터시트(HTML) 3 Page - ON Semiconductor

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NCP1237
http://onsemi.com
3
SIMPLIFIED INTERNAL BLOCK SCHEMATIC
Reset
Brown−out
CS
FB
−
+
blanking
timer
VDD
−
+
−
+
+
−
+
+
S
R
Q
Soft−start Start
Reset
IC Start
IC Stop
Oscillator
HV
VCC
Latch
−
+
+
Vskip
Protection
Mode
release
timer
Autorecovery
protection
mode only
DRV
HV sample
OVM
BO
Clamp
UVLO
Fault
Reset
Sawtooth
Jitter
HV stop
Brown−out
HV stop
V to I
HV sample
Latch
Dual HV
start−up
current source
VCC
management
HV current
TSD
VDD
UVLO
Reset
TSD
Start
IC Start
Skip
PWM
Soft−start
Reset
VDD
UVLO
Soft−skip ramp
IC stop
TSD
TSD
HV dc
ILIMIT
PWM
Fault Flag
Foldback
FB
GND
FB
Stop
Skip
DMAX
R
S
Q
S
R
Q
−
+
+
blanking
−
+
S
R
Q
−
+
blanking
Brown−out
Reset
Latch
Vclamp
blanking
1 kW
+
+
Soft−start
end
Soft−start end
End
slope
comp.
Figure 3. Simplified Internal Block Schematic
ramp
IOPC = 0.5m x
(VHV−125)
VDD
INTC
INTC
VOVP
VOTP
tLatch(OVP)
tLatch(OTP)
tSSKIP
RFB(up)
KFB
tSSTART
VFB(OPC)
tLEB
tBCS
VCS(tran)
VILIM
ILIMIT
ITRAN
VCS(stop)
ITRAN
DCMAX
DMAX
tfault
ttran
tautorec



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