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NCP1337 Datasheet(PDF) 3 Page - ON Semiconductor

Part No. NCP1337
Description  PWM Current−Mode Controller for Free Running Quasi−Resonant Operation
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1337 Datasheet(HTML) 3 Page - ON Semiconductor

 
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NCP1337
http://onsemi.com
3
Figure 2. Internal Circuit Architecture
+
GND
BO
5 V
+
+
3 V
DISABLE
10
mA
Vdd
+
BOK
7.5
ms min
period
SStart
Ton
Clk
D
R1
R2
Q
Q
S
Soxyless
demag
detection
DRV
Startup
S
Q
R
VCC < 4 V
PERM. LATCH
Vdd
TSD
TSD
Soxyless
8
ms
timeout
35
ms
max Toff
5.5
ms
blanking
Toff
VCC
Soxyless
VBO
+
500 mV
OVP
+
SSkip
Skip
Setpoint
+
+
20 kHz
Low−pass
filter
Vdd
FB
3 V
500 mV
FAULT
if Zener
activated
Vdd
Ton
VBO
70
mA x VBO − 35 mA
CS
2 p
4 k
350 ns
LEB
CS
comp.
300
ms
Soft−Skip
t
SSkip
4 ms
soft−start
SStart
PERM.
LATCH
67
ms
max Ton
FAULT
Management*
FAULT
(*If FAULT duration > 80 ms = > STOP
Restart when 2nd time VCC = VCCon)
TSD
Inhib
Toff
Ton
+
+
12 V
10 V
5 V
HV
9.5 mA or
600
mA
VCC
+
+
OVP
18.6 V
100 mV
130 mV
+
Ton


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