NCP1380 ON Semiconductor, NCP1380 Datasheet - Page 5

• Manufacturer Part Number: NCP1380
• Description: Quasi-Resonant Current Mode Controller
• Manufacturer: ON Semiconductor

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Rsense
La ux
ZCD
CS
FB
Ct
R pul l up
VDD
ICt
VDD
/ 4
LEB 2 is shorter than LEB 1
LEB 1
LEB 2
I
peak(VCO)
10 V
ESD
Ct se tpoint
discharge
DRV
Ct
= 17.5% V
SS end
Vth
SS end
V ILIMIT
Figure 4. Internal Circuit Architecture for Versions C and D
3 ms blanking
ILIMIT
+
−
+
−
OPP
The 40 ms Time Out is active
only during s oft−s ta r t
Soft-start
SS end
V CS ( st op)
Time Out
Time Out
40 ms
5 ms
de ma g
Soft−s ta r t e nd ? the n 1
else 0
LOGIC BLOCK
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−
+
+
−
+
−
VDD
P W Mreset
5
IpFlag
CsS top
R
S
Q
DRV
Q
BO r es et
latch
Q
Q
gr a nd
reset
R
S
noi s e de l a y
VDD
V
nois e de la y
gr a nd
CC
reset
C :
l a tc he d
management
fa ul t
TIMER
Res et
BO reset
VCCstop
+
+
−
−
Down
gr a nd
reset
VBO
CsS top
Up
VOVP
Vclamp
I pFl a g
P W Mreset
Rclamp
clamp
VDD
IBO
VCC
DRV
GN D
OVP/BO
VCC
ga te
aux
HV