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NCP1219

PWM Controller with Adjustable Skip Level and External Latch Input

ON Semiconductor 

NCP1219

PWM Controller with

Adjustable Skip Level and

External Latch Input

The NCP1219 represents a new, pin to pin compatible, generation

of the successful 7−pin current mode NCP12XX product series. The

controller allows for excellent standby power consumption by use of

its adjustable skip mode and integrated high voltage startup FET.

Internal frequency jittering, ramp compensation, timer−based fault

detection and a latch input make this controller an excellent

candidate for converters where ruggedness and component cost are

the key constraints.

The Dynamic Self Supply (DSS) drastically simplifies the

transformer design in avoiding the use of an auxiliary winding to

supply the NCP1219. This feature is particularly useful in

applications where the output voltage varies during operation (e.g.

battery chargers). Due to its high voltage technology, the IC can be

directly connected to the high voltage dc rail.

Features

• Fixed−Frequency Current−Mode Operation with Ramp

Compensation (65 kHz and 100 kHz Options)

• Dynamic Self Supply Eliminates the Need for an Auxiliary Winding

• Timer−Based Fault Protection for Improved Overload Detection

• Cycle Skip Reduces Input Power in Standby Mode

• Latch and Auto−Recovery Overload Protection Options

• Internal High Voltage Startup Circuit

• Accurate Current Limit Detector (±5%)

• Adjustable Skip Level

• Latch Input for Easy Implementation of Overvoltage and

Overtemperature Protection

• Frequency Modulation for Softened EMI Signature

• 500 mA/800 mA Peak Source/Sink Current Drive Capability

• Pin to Pin Compatible with the Existing NCP12XX Series

• These are Pb−Free Devices

• These are Halide−Free Devices

http://onsemi.com

SOIC−7

D SUFFIX

CASE 751U

MARKING DIAGRAM

8

1219XZ

ALYW

G

1

1219 = Specific Device Code

X = Overcurrent

= (A = latch, B = auto−retry)

Z = Frequency

= (6 = 65 kHz, 1 = 100 kHz)

A = Assembly Location

L = Wafer Lot

Y = Year

W = Work Week

G = Pb−Free Package

PIN CONNECTIONS

Skip/latch

1

HV

FB

CS

VCC

GND

Drv

(Top View)

Typical Applications

• AC−DC Adapters for Notebooks, LCD Monitors

• Offline Battery Chargers

• Consumer Electronic Appliances STB, DVD, DVDR

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 19 of this data sheet.

© Semiconductor Components Industries, LLC, 2009

1

May, 2009 − Rev. 1

Publication Order Number:

NCP1219/D

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