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NCP1381 Datasheet(PDF) 3 Page - ON Semiconductor

Part No. NCP1381
Description  Low−Standby High Performance PWM Controller
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1381 Datasheet(HTML) 3 Page - ON Semiconductor

 
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NCP1381
http://onsemi.com
3
INTERNAL CIRCUIT ARCHITECTURE
shot
+
+
12
11
9
8
10
7
6
5
+
+
4
3
+
2
+
+
LEB
+
+
+
+
R
S
4 V Reset
Plateau
Sensing
25 k
Skip
Section
Vlatch
CS
FB
Skip/
OVP
Timer
VDD
OPP
Offset
SS
Skip
IPFlag
Latchoff
VDD
Q
Q
Soft−Skip
Soft−Start
IP Flag
GTS
Soft−Start Ended
Timer
VDD
Switches are Kept Closed until NOR
Output Goes Low
GND
Drv
VDD
SSCap
VTimFault
VTimSS
SSCap
Fault /
Startup
/ 4
VDD
1
DMG
BO
ADJ_GTS
RST
Timer
+
+
ADJ_GTS Section
250 mV
BOComp.
240 mV/
500 mV
VDD
+
+
R
S
Q
Q
CLK
R
S
Q
Q
CLK
DRV
to
Latch
+
+
+
3
ms
1 Shot
VCC Management
UVLO, Latchoff
4
ms
Delayed
1 Shot
BO
IP
Flag
Timer
8
ms No DMG
Timeout
DRV
Vth
VlatchDem
Prioritary
Reset
+
VDD
DRV
+
tON > 45 ms?
Fault
+
DRV
VDD
tON + tOFF=8 ms
Max Fsw
Clamping
1 Shot
Ref
GTS
Conf. ?
Timer
VCC
BO
+
UVLO
Vref
Figure 2. Internal Circuit Architecture
5
mA
GTS
30
mA
I/V 85
mS


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