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NCP1217
(Rev.:2004)

Enhanced PWM Current-Mode Controller for High-Power Universal Off-Line Supplies

ON Semiconductor 

NCP1217, NCP1217A

Enhanced PWM Current−Mode

Controller for High−Power

Universal Off−Line Supplies

Housed in an SO−8 or PDIP−7 package, the NCP1217 represents

the enhanced version of the NCP1203−based controllers. Thanks to its

high drive capability, NCP1217 drives large gate−charge MOSFETs,

which together with internal ramp compensation and built−in

overvoltage protection, ease the design of modern AC/DC adapters.

NCP1217 offers a true alternative to UC384X−based designs.

With an internal structure operating at different fixed frequencies

(65–100–133 kHz), the controller features a high−voltage startup FET,

which ensures a clean and loss less startup sequence. Its current−mode

control topology provides an excellent input audio−susceptibility and

inherent pulse−by−pulse control. Internal ramp compensation easily

prevents subharmonic oscillations from taking place in continuous

conduction mode designs.

When the current setpoint falls below a given value, e.g. the output

power demand diminishes, the IC automatically enters the so−called

skip cycle mode and provides excellent efficiency at light loads.

Because this occurs at a user adjustable low peak current, no acoustic

noise takes place.

The NCP1217 features two efficient protective circuitries: 1) In

presence of an overcurrent condition, the output pulses are disabled

and the device enters a safe burst mode, trying to restart. Once the

default has gone, the device auto−recovers. 2) If an external signal

(e.g. a temperature sensor) pulls Pin 1 above 3.2 V, output pulses are

immediately stopped and the NCP1217 stays latched in this position.

Reset occurs when the VCC collapses to ground, e.g. the user unplugs

the power supply.

Features

• Current−Mode with Adjustable Skip−Cycle Capability

• Built−in Internal Ramp Compensation

• Auto−Recovery Internal Output Short−Circuit Protection

• Internal 1.0 ms Soft−Start (A Version Only)

• Limited Duty−Cycle to 50% (A Version Only)

• Full Latchoff if Adjustment Pin is Brought High

• Extremely Low No−Load Standby Power

• Internal Temperature Shutdown

• 500 mA Peak Current Capability

• Fixed Frequency Versions at 65 kHz, 100 kHz and 133 kHz

• Direct Optocoupler Connection

• Internal Leading Edge Blanking

• SPICE Models Available for TRANsient and AC Analysis

• Pb−Free Packages are Available

Typical Applications

• High Power AC/DC Converters for TVs, Set−Top Boxes, etc.

• Offline Adapters for Notebooks

• Telecom DC−DC Converters

• All Power Supplies

http://onsemi.com

MINIATURE PWM

CONTROLLER FOR HIGH

POWER AC/DC WALL

ADAPTERS AND OFFLINE

BATTERY CHARGERS

8

1

SO−8

D SUFFIX

CASE 751

MARKING

DIAGRAMS

8

17XXX

ALYW

1

8

1

PDIP−7

P SUFFIX

CASE 626B

P1217XXXX

AWL

YYWW

1

XXXX = Specific Device Code*

A

= Assembly Location

WL, L = Wafer Lot

YY, Y = Year

WW, W = Work Week

*DEVICE MARKING INFORMATION

See detailed device marking information in the ordering

information section on page 16 of this data sheet.

PIN CONNECTIONS

Adj 1

FB 2

CS 3

Gnd 4

8 HV

7 NC

6 VCC

5 Drv

(Top View)

ORDERING INFORMATION

See detailed ordering and shipping information in the ordering

information section on page 16 of this data sheet.

© Semiconductor Components Industries, LLC, 2004

1

July, 2004 − Rev. 3

Publication Order Number:

NCP1217/D

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