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NCP1027

High-V oltage Switcher

for Medium Power Offline

SMPS Featuring Low

Standby Power

The NCP1027 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

http://onsemi.com

MARKING

DIAGRAM

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. An integrated, auto- recovery, Overvoltage Protection

permanently monitors the V CC level and temporarily shuts down the

driving pulses in case of an unexpected feedback loop runaway.

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.

8-LEAD PDIP

P SUFFIX

CASE 626A

XXX = 65 or 100

A = Assembly Location

WL = Wafer Lot

YY = Year

WW = Work Week

G = Pb-Free Package

PIN CONNECTIONS

P1027PXXX

AWL

YYWWG

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

V CC

Ramp Comp.

Brown-Out

(Top View)

GND

OPP

Drain

Detection

Auto-Recovery Overvoltage Protection with Auxiliary Winding

Operation

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

ORDERING INFORMATION

Device Package Shipping *

NCP1027P065G PDIP-8 50 Units / Rail

(Pb-Free)

NCP1027P100G 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.

Typical Applications

? Medium Power AC-DC Adapters for Chargers

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

Reference

NCP1027 - 5.8 W

230 VAC

25 W*

90-265 VAC

15 W*

*Typical values, open-frame, 65 kHz version, R q JA < 75 ° C/W, T A = 50 ° C.

? Semiconductor Components Industries, LLC, 2007

May, 2007 - Rev. 4

Publication Order Number:

NCP1027/D

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