NCP1000_06 ONSEMI [ON Semiconductor], NCP1000_06 Datasheet - Page 13

• Manufacturer Part Number: NCP1000_06
• Description: Integrated Off−Line Switching Regulator
• Manufacturer: ONSEMI [ON Semiconductor]

APPLICATION #1: Offline Converter Provides
5.0 V, 1.0 A Output for Small Electronic Equipment
offers a low cost, high efficiency power source for low power,
electronic equipment. It serves the same function as small, line
frequency transformers, but with the added benefits of line and
load regulation, transient suppression, reduction in weight, and
operation across the universal input voltage range.
an input source of 85 to 265 Vac, and 50 Hz to 60 Hz. This range
of input voltages will allow this circuit to function virtually
anywhere in the world without modification. The output is
regulated and current limited, and EMI filters are included on
both the input and output.
For additional information on this application, please order application note AND8019/D from the Literature Distribution Center or download
from our website at http://onsemi.com.
Power Switch
Circuit Voltage
(Pin 5)
V in
ON Semiconductor’s NCP1000 series of offline converters
This kit provides a 5.0 V, 1.0 A output, which is derived from
V
CC
(Pin 1)
C5
Limiter
F1
Startup Circuit
Hysteretic Regulation
C1
p/o U2
Switching Disabled
C4
Startup
R S
6.8
6.8
R7
I
On
start
1
D1 − D4
Switching
1000
NCP
I
Off
CC1
Figure 20. Auto Restart Operation Timing Diagram
1
On
I
C2a C2b
start
NCP1000, NCP1001, NCP1002
APPLICATIONS INFORMATION
R1
Switching Disabled
2
I
CC2
Eight Cycles
Off
+
7
I
On
start
Auto Restart Operation with Overloaded or Shorted Output
+
http://onsemi.com
8
I
Off
CC2
Power Switch Circuit Duty Cycle During Auto Restart
I
start
13
On
R2
C3
Switching
Converter Test Data
C8
I
Off
CC1
5%
Line Regulation
Load Regulation
Combined Line/
Load Regulation
Output Ripple
Input Power
Power Factor
Efficiency
1
D6
Parameter
Figure 21. Wall Adapter Schematic
2
L2
During Auto Restart
Switching Disabled
Startup MOSFET
7
Duty Cycle
35%
95%
D5
C6
85 v v Vin v 265 v
0 A v lo v 1.0 A
85 v v Vin v 265 v
.09 A v lo v 1.0 A
lo = 1.0 A
V
V
V
V
V
V
8
65%
in
in
in
in
in
in
C9
= 115 v, lo = 1.0 A
= 220 v, lo = 1.0 A
= 115 v, lo = 1.0 A
= 220 v, lo = 1.0 A
= 115 v, lo = 1.0 A
= 220 v, lo = 1.0 A
Conditions
U3
Switching
C7
1
p/o U2
R3
C10
8.6 V
7.5 V
0 V
Flyback Voltage
Rectified Line Voltage
0 V
R5
R4
DVo = 6.0 mV
DVo = 8.0 mV
DVo = 10 mV
100 mV
7.75 watts
7.88 watts
−.57
−.49
h = 66%
h = 64%
RETURN
5 V, 1 A
Data
pp