NCP1379 ON Semiconductor, NCP1379 Datasheet - Page 3

• Manufacturer Part Number: NCP1379
• Description: Quasi-Resonant Current-Mode Controller
• Manufacturer: ON Semiconductor

Rsense
ZC D
La ux
CS
FB
Ct
Rpullup
VDD
ICt
VDD
/ 4
LE B 2 is shorter than LE B 1
I
peak(VCO)
LEB 2
LEB 1
10 V
ESD
C t s e tpoint
DRV
Discharge
= 17.5 % V
C t
SS end
Vth
SS end
V ILIMIT
3 ms blanking
ILIMIT
+
+
−
−
OPP
The 40 ms Time Out is active
only during s oft−s ta r t
SS end
INTERNAL CIRCUIT ARCHITECTURE
Soft-start
Figure 2. Internal Circuit Architecture
Time Out
Time Out
V CS(stop )
40 ms
5 ms
Soft-start end ? then 1
else 0
de ma g
LOGIC BLOCK
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−
+
+
−
+
−
VDD
PW Mreset
3
I pFl a g
Cs S top
S
R
DRV
Q
Q
BO r e se t
latch
Q
Q
gr a nd
reset
R
S
gr a nd
noise delay
reset
VDD
V
noi s e de l a y
CC
management
fa ul t
TIMER
Reset
Down
gr a nd
reset
Up
V CCstop
CsS top
BO r e se t
+
+
−
−
VBO
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IpFlag
PW Mreset
VOVP
Vclamp
Rclamp
clamp
VDD
IBO
Vcc
DRV
GN D
OVP/BO
VCC
V cc aux
ga te
HV