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NCP1239 Datasheet(PDF) 8 Page - ON Semiconductor

Part No. NCP1239
Description  Low−Standby High Performance PWM Controller
Download  38 Pages
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1239 Datasheet(HTML) 8 Page - ON Semiconductor

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NCP1239
http://onsemi.com
8
Figure 4. NCP1239V Internal Circuit Architecture
+
7
S
R
Q
Q
Vcc < 4V
450mV
5V
0.5V / 0.25V
Rt
BO
REF5V
SS / timer
PFC_Vcc
Fault
detect
Skip
adjust
Vdd
/ 3
to Skip
20k
0.9V
Oscillator
GND
32k
CS
Drv
Vcc
Vdd
Regul
UVLOs
Latch
Reset
Error flag
HV
Dmax
Vdd
2.5V
Vdd
2.5V
100k
Fault
Vdd
Vdd
Soft−Start
and timer
management
Stby_detect
Error_Flag
Stby
OVL
OVL
Vcc<7V
stdwn
Vstop
Output
Buffer
BO_out
Jittering
Modulation
“Jittered”
Reference
Jittering
Modulation
CLK
CLK
BO_in
Soft−Start
Ipk limit
Soft−Start
Ipk limit
Internal
Thermal
Shutdown
TSD
FB
Divider by 2
+
Skip
Skip
FB
Startup Phase
(Vcc<VccOFF)
1mA
Vcc
10k
Vstop
regOUT
Stby_detect
25r
15r
S
R
Q
Q
FB<Vpin1 => Skip high
FB>1.6*Vpin1 =>Stby_detect RESET
pfcOFF
pfcON
UVLO
14V
clamp
pfcON
OUTon
Ramp
Compensation
3.2V
Idmax
LEB
+
+
16
15
14
13
+
3
1
S
R
Q
Q
6
2
+
12
11
10
5
+
S
R
Q
Q
9
+
+
+
8
4
OSC
OSC


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