NCP1380 ON Semiconductor, NCP1380 Datasheet - Page 4

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

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Rsense
La ux
ZCD
CS
FB
Ct
Rpullup
VDD
ICt
VDD
/ 4
LEB 2 is shorter than LEB 1
I
peak(VCO)
LEB 2
LEB 1
10 V
ESD
Ct s e tpoi nt
Discharge
DRV
= 17.5% V
Ct
SS end
Vth
V ILIMIT
Figure 3. Internal Circuit Architecture for Versions A and B
3 ms blanking
ILIMIT
SS end
+
−
+
−
OPP
INTERNAL CIRCUIT ARCHITECTURE
The 40 ms Time Out is active
only during s oft−s ta r t
Soft-start
SS end
V C S(stop)
Ti me Out
Ti me Out
40 ms
5 ms
de ma g
Soft−s ta rt e nd ? the n 1
else 0
L OGI C BL OCK
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−
+
+
−
+
−
VDD
4
PWMreset
IpFlag
CsS top
S
R
Q
DRV
Q
latch
noi s e de l a y
Q
P W Mr eset
Q
gr a nd
reset
V
noi s e de l a y
VDD
gr a nd
reset
R
S
CC
IpFlag
A:
l a tc he d
management
fa ul t
SS end
BO r eset
VCCstop
Up
Down
gr a nd
−
−
+
+
reset
Cs S top
TIM ER
I OTP(REF)
V OVP
V OTP
Reset
clamp
VDD
VCC
DRV
GN D
Fa ul t
ga te
VCC
aux