ncp1338 ON Semiconductor, ncp1338 Datasheet - Page 3

• Manufacturer Part Number: ncp1338
• Description: Pwm Current-mode Controller For Free Running Quasi-resonant Operation
• Manufacturer: ON Semiconductor

GND
BO
CS
FB
V
500 mV
V
+
BO
4 k
5 V
3 V
Ton
BO
Vdd
+
3 V
+
100 mV
130 mV
Low-pass
2 p
Vdd
20 kHz
filter
+
-
+
70 mA x V
-
activated
+
500 mV
-
if Zener
FAULT
350 ns
+
10 mA
LEB
BO
OVP
DISABLE
- 35 mA
BOK
+
-
Vdd
Skip
Setpoint
S
R
Q
Figure 2. Internal Circuit Architecture
SSkip
Soft-Skip
Soft-Ski
+
-
V
300 ms
4 ms
PERM. LATCH
Startup
CC
CS
comp.
p
< 4 V
http://onsemi.com
Ton
t
(*If FAULT duration > 80 ms = > STOP
Restart when 2nd time VCC = VCCon)
NCP1338
LATCH
PERM.
Vdd
Ton
TSD
SSkip
SStart
3
max Ton
67 ms
SStart
Soxyless
7.5 ms min
FAULT
TSD
period
Management*
timeout
FAULT
8 ms
TSD
D
R1
Clk
S
R2
Q
Q
max Toff
35 ms
Toff
12 V
10 V
5 V
Toff
OVP
Ton
+
V
-
blanking
+
CC
5.5 ms
+
-
9.5 mA or
600 mA
Inhib
Soxyless
+
18.6 V
Soxyless
detection
demag
DRV
HV
VCC