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NCP1282 Datasheet(PDF) 2 Page - ON Semiconductor

Part No. NCP1282
Description  High Performance Active Clamp/Reset PWM Controller Featuring 500 V Startup
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1282 Datasheet(HTML) 2 Page - ON Semiconductor

 
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NCP1282
http://onsemi.com
2
Figure 1. Detailed Block Diagram
Vin
1
16
VAUX
Iinhibit
Istart
Disable
+
VAUX(on)
+
Central
Logic
Disable_VREF
5.0 V Reference
VAUX
P.O.R.
Bias
VREF
8
S
Dominant
Reset
Latch
R
Q
CAUX
VAUX(on)/
VAUX(off1)/
VAUX(off2)
+
+
One Shot
Pulse
VUV Soft−Stop
Complete
Thermal
Shutdown
STOP
UVOV
Detector
UVOV
Vin
R2
R1
2 V
3 V
Vref
CT
RT
6
RTCT
500 mA
SYNC
DMAX
Clock
Oscillator
7
SYNC
+
CSKIP
Comparator
+
VCSKIP
CSKIP
Control
Logic
VREF
ICSKIP(C)
ICSKIP(D)
12
CSKIP
CCSKIP
Clock
+
Not
Saturated
+
3.6 V
Saturation
Comparator
S
Dominant
Reset
Latch
R
Q
Q
Clock
FF Reset
Delay
Logic
Enable_Output
OUT1
15
VAUX
14
PGND
OUT2
13
VAUX
11
270 kW
20 kW
VREF
+
PWM
Comparator
− +
Soft−Start
Comparator
− +
FF
Comparator
+
0.2 V
3 V
+
Vin
RFF
CFF
VEA
FF
3
5
GND
FF Reset
Ilimit
Comparator
+
+
0.5 V
OUT
Fixed 80 ns LEB
Clock
Enable
Not
Saturated
Soft−Start
Soft−Stop
Control Logic
STOP
VX
Soft−Start
Complete
Soft−Stop
Complete
VREF
ISS(C)
ISS(D)
10
SS
CSS
4
CS
Enable_Output
1 V
2
tD
RD
9
VX


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