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NCP1000P

Integrated Off−Line Switching Regulator

ON Semiconductor 

NCP1000, NCP1001,

NCP1002

Integrated Off−Line

Switching Regulator

The NCP1000 through NCP1002 series of integrated switching

regulators, combine a fixed frequency PWM controller with an integrated

high voltage power switch circuit. This chip allows for simple design and

minimal parts count for very low cost applications which utilize an ac

input. This chip is designed to power a single ended topology, typically a

discontinuous mode flyback, with secondary side sensing.

The internal high voltage switch circuit and startup circuit can

function in continuous operation over a wide range of inputs, from

85 Vac to 265 Vac, and thus can be used in any existing power system in

the world. Though inexpensive, these devices include a number of

features such as undervoltage lockout, over−temperature protection,

bandgap reference and leading edge blanking that make them an

excellent value.

Features

• Highly Integrated Solution

• Operates Over Universal Input Voltage Range (85 Vac to 265 Vac)

• On−board 700 V Power Switch Circuit

• Minimal External Parts Required

• Input Undervoltage Lockout with Hysteresis

• Very Low Standby Current

• No Minimum Load Requirement

• Opto Fail−Safe Shutdown Circuit

• Pb−Free Packages are Available*

Typical Applications

• Cell Phone Chargers

• Wall Adapters

• On−board AC−DC Converters

VCC

STARTUP

INTERNAL BIAS

UVLO &

OPTO FAIL−SAFE

STARTUP

CIRCUIT

FEEDBACK

INPUT

GND

+

−

PWM

PWM CONTROL

& POWER

SWITCH CIRCUIT

COMPARATOR

POWER

SWITCH

CIRCUIT

OSCILLATOR

Figure 1. Simplified Block Diagram

*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, 2006

1

February, 2006 − Rev. 8

http://onsemi.com

8

1

PDIP−8

P SUFFIX

CASE 626

Pin: 1.

2.

VCC

Feedback Input

3, 6−8 Ground

4. Startup

5. Power Switch Circuit

MARKING DIAGRAM

8

NCP100xP

AWL

YYWWG

1

x = Device Number 0, 1, or 2

A = Assembly Location

WL = Wafer Lot

YY = Year

WW = Work Week

G = Pb−Free Package

ORDERING INFORMATION*

Device

Package

Shipping

Ipk Ron

Typ Max

(A) (W)

NCP1000P PDIP−8 50 Units/Rail 0.5 18

NCP1000PG PDIP−8 50 Units/Rail 0.5 18

(Pb−Free)

NCP1001P PDIP−8 50 Units/Rail 1.0 9

NCP1001PG PDIP−8 50 Units/Rail 1.0 9

(Pb−Free)

NCP1002P PDIP−8 50 Units/Rail 1.5 6

NCP1002PG PDIP−8 50 Units/Rail 1.5 6

(Pb−Free)

*Consult factory for additional optocoupler fail−safe

latching, frequency, and current limit options.

Publication Order Number:

NCP1000/D

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