NCP1280_05 ONSEMI [ON Semiconductor], NCP1280_05 Datasheet - Page 2

• Manufacturer Part Number: NCP1280_05
• Description: Active Clamp Voltage Mode PWM Controller for Off-Line Applications
• Manufacturer: ONSEMI [ON Semiconductor]

V
V
in
in
UV/OV
R
R
C
CSKIP
C
FF
C
T
CSKIP
GND
V
SS
AUX
CS
AUX
V
16
SS
FF
14
R
3
5
6
1
9
4
in
7
T
11 mA
6 mA
1.49 V
I
FF
1.3 V*
+
−
V
V
REF
5.3 kW
+
0.6 V
−
6.7 kW
+
−
REF
+
−
+
−
I
3.6 V
START
Disable
* Trimmed during
manufacturing to obtain
1.3 V with R
V
+
−
Disable_ss
AUX(ON)
One Shot
+
−
(600 ns)
+
−
0.5 V
Pulse
+
V
−
+
+
−
−
STOP
−
+
/V
AUX(OFF)
T
Disable
= 101 kW
+
−
Disable_V
Figure 2. NCP1280 Functional Block Diagram
2 V
+
−
+
10 pF
−
I +
CURRENT MIRROR
125 kW
I
−
1
V
REF
+
Clock
+
−
C
2 V
Comparator
FF
Soft Start
http://onsemi.com
Clock
10 pF
2
I
1
NCP1280
One Shot
One Shot
(250 ns)
2
Pulse
FF Ramp
(Adjustable)
Pulse
STOP
Oscillator Ramp
S
R
Dominant)
(Reset
Output
Latch
S
R
Monotonic
Dominant)
(Reset
Latch
+
Start
−
2 V
Q
+
−
2 V
Q
Disable_ss
Delay
Logic
+ −
V
5.0 V Reference
Disable_V
DC(inv)
+
+
−
Comparator
V
−
Max DC
DIS
AUX
Comparator
2 V
V
20 kW
AUX
PWM
40 kW
32 kW
27 kW
REF
DIS
V
AUX
2 kW
DIS
10
V
12
t
15
13
D
11
V
8
REF
REF
V
OUT2
R
OUT1
DC
EA
R
D
R
MDP
P
MAX