© Semiconductor Components Industries, LLC, 2015
January, 2015 − Rev. 3
1 Publication Order Number:
NCP1028/D
NCP1028
High-Voltage Switcher
for Medium Power Offline
SMPS Featuring Low
Standby Power
The NCP1028 offers a new solution targeting output power levels
from a few watts up to 15 W in a universal mains flyback application.
Our proprietary high−voltage technology lets us include a power
MOSFET together with a startup current source, all directly
connected to the bulk capacitor. To prevent lethal runaway in low
input voltage conditions, an adjustable brown−out circuitry blocks
the activity until sufficient input level is reached.
Current−mode operation together with an adjustable ramp
compensation offers superior performance in universal mains
applications. Furthermore, an Over Power Protection pin brings the
ability to precisely compensate all internal delays in high input voltage
conditions and optimize the maximum output current capability.
Protection wise, a timer detects an overload or a short−circuit and
stops all operations, ensuring a safe auto−recovery, low duty cycle burst
operation.
Finally, a great R
DS(on)
figure makes the circuit an excellent choice
for standby/auxiliary offline power supplies or applications requiring
higher output power levels.
Features
• Built−in 700 V MOSFET with Typical R
DS(on)
of 5.8 W, T
J
= 25°C
• Current−Mode Fixed Frequency Operation: 65 kHz and 100 kHz
• Fixed Peak Current of 800 mA
• Skip−Cycle Operation at Low Peak Currents
• Internal Current Source for Clean and Lossless Startup Sequence
• Auto−Recovery Output Short Circuit Protection with Timer−Based
Detection
• Programmable Brown−Out Input for Low Input Voltage Detection
• Programmable Over Power Protection
• Input to Permanently Latchoff the Part
• Internal Frequency Jittering for Improved EMI Signature
• Extended Duty Cycle Operation to 80% Typical
• No−Load Input Standby Power of 85 mW @ 265 Vac
• 500 mW Loaded, Input Power of 715 mW @ 230 Vac
• These Devices are Pb−Free and are RoHS Compliant*
Typical Applications
• Medium Power AC−DC Adapters for Chargers
• Auxiliary/Standby Power Supplies for ATX and TVS Power Supplies
Reference 230 VAC 90−265 VAC
NCP1028 − 5.8 W 25 W* 15 W*
*Typical values, open−frame, 65 kHz version, R
q
JA
< 75°C/W, T
A
= 50°C.
**For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques Reference
Manual, SOLDERRM/D.
8−LEAD PDIP
P SUFFIX
CASE 626A
PIN CONNECTIONS
Device Package Shipping*
ORDERING INFORMATION
NCP1028P065G PDIP−8
(Pb−Free)
50 Units / Rail
www.onsemi.com
MARKING
DIAGRAM
xxx = 65 or 100
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
(Top View)
Ramp Comp.
V
CC
Brown−Out
FB
Drain
P1028Pxxx
AWL
YYWWG
GND
OPP
*For additional information on our Pb−Free strateg
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
NCP1028P100G PDIP−8
(Pb−Free)
50 Units / Rail
