NCP1028 データシートの表示（PDF） - ON Semiconductor

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NCP1028

High−Voltage Switcher for Medium Power Offline SMPS Featuring Low Standby Power

ON Semiconductor 

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 RDS(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 RDS(on) of 5.8 W, TJ = 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 are Pb−Free Devices**

Typical Applications

• Medium Power AC−DC Adapters for Chargers

• Auxiliary/Standby Power Supplies for ATX and TVS Power Supplies

Reference

NCP1028 − 5.8 W

230 VAC

25 W*

90−265 VAC

15 W*

*Typical values, open−frame, 65 kHz version, RqJA < 75°C/W, TA = 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.

http://onsemi.com

MARKING

DIAGRAM

8−LEAD PDIP

P SUFFIX

CASE 626A

P1028Pxxx

AWL

YYWWG

xxx = 65 or 100

A

= Assembly Location

WL = Wafer Lot

YY

= Year

WW = Work Week

G

= Pb−Free Package

PIN CONNECTIONS

VCC

Ramp Comp.

Brown−Out

FB

GND

OPP

(Top View)

Drain

ORDERING INFORMATION

Device

Package

Shipping*

NCP1028P065G

PDIP−8 50 Units / Rail

(Pb−Free)

NCP1028P100G

PDIP−8 50 Units / Rail

(Pb−Free)

*For additional information on our Pb−Free strategy

and soldering details, please download the

ON Semiconductor Soldering and Mounting

Techniques Reference Manual, SOLDERRM/D.

© Semiconductor Components Industries, LLC, 2007

1

January, 2007 − Rev. 0

Publication Order Number:

NCP1028/D

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