NCP1255_12 datasheet(1/22 Pages) ONSEMI

Part #	NCP1255

Description	Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion

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Manufacturer	ONSEMI [ON Semiconductor]

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December, 2012 − Rev. P0

1

Publication Order Number:

NCP1255/D

NCP1255

Product Preview

Current-Mode PWM

Controller for Off-line

Power Supplies featuring

Peak Power Excursion

The NCP1255 is a highly integrated PWM controller capable of

delivering a rugged and high performance offline power supply in a

SOIC−8 package. With a supply range up to 35 V, the controller hosts a

jittered 65−kHz switching circuitry operated in peak current mode

control. When the power on the secondary side starts to decrease, the

controller automatically folds back its switching frequency down to a

minimum level of 26 kHz. As the power further goes down, the part

enters skip cycle while freezing the peak current setpoint.

To help build rugged converters, the controller features several key

protective features: a brown−out, a non−dissipative Over Power

Protection for a constant maximum output current regardless of the

input voltage, two latched over voltage protection inputs − either

through a dedicated pin or via the Vcc input − and finally, the

possibility to externally adjust an auto−recovery timer duration.

The controller architecture is arranged to authorize a transient peak

power excursion when the peak current hits the limit. At this point, the

switching frequency is increased from 65 kHz to 130 kHz until the

peak requirement disappears. The timer duration is then modulated as

the converter crosses a peak power excursion mode (long) or

undergoes a short circuit (short).

Features

• 65−kHz Fixed−frequency Current−mode Control Operation with

130−kHz Excursion

• Internal and Adjustable Over Power Protection (OPP) Circuit

• Adjustable Brown−Out Protection Circuit

• Frequency Foldback down to 26 kHz and Skip−cycle in Light Load

Conditions

• Adjustable Slope Compensation

• Internally Fixed 4−ms Soft−start

• Adjustable Timer−based Auto−recovery Overload/Short−circuit

Protection

• 100% to 25% Timer Reduction from Overload to Short−circuit Fault

• Double Vcc Hiccup for a Reduced Average Power in Fault Mode

• Frequency Jittering in Normal and Frequency Foldback Modes

• Latched OVP Input for Improved Robustness and Latched OVP on Vcc

• Up to 35−V Vcc Maximum Rating

• Extremely Low No−load Standby Power

• This is a Pb−Free Device

Typical Applications

• Converters requiring peak−power capability such as printers power

supplies, ac−dc adapters for game stations.

This document contains information on a product under development. ON Semiconductor

reserves the right to change or discontinue this product without notice.

PIN CONNECTIONS

1

3

Vcc

GND

2

OPP/Latch

5

Timer

7

(Top View)

6

BO

SOIC−8

D1, D2 SUFFIX

CASE 751

MARKING DIAGRAM

FB

http://onsemi.com

(Note: Microdot may be in either location)

See detailed ordering and shipping information in the package

dimensions section on page 2 of this data sheet.

ORDERING INFORMATION

1

8

4

DRV

CS

XXXXX = Specific Device Code

A

= Assembly Location

L

= Wafer Lot

Y

= Year

W

= Work Week

G

= Pb−Free Package

XXXXX

ALYWX

G

1

8

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