NCP1338_14 datasheet(1/15 Pages) ONSEMI

Part #	NCP1338

Description	PWM Current-Mode Controller for Free Running Quasi-Resonant Operation

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Manufacturer	ONSEMI [ON Semiconductor]

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December, 2014 − Rev. 2

1

Publication Order Number:

NCP1338/D

NCP1338

PWM Current-Mode

Controller for Free Running

Quasi-Resonant Operation

The NCP1338 combines a true current mode modulator and a

demagnetization detector which ensures full Borderline/Critical

Conduction Mode in any load/line conditions together with

minimum drain voltage switching (Quasi−Resonant operation). The

transformer core reset detection is done internally, without using any

external signal, due to the Soxyless concept. The frequency is

internally limited to 130 kHz, preventing the controller from

operating above the 150 kHz CISPR−22 EMI starting limit.

By monitoring the feedback pin activity, the controller enters skip

mode as soon as the power demand falls below a predetermined

level. As each restart is softened by an internal Soft−Skip

t, and as

the frequency cannot go below 25 kHz, no audible noise can be

heard.

The NCP1338 also features an efficient protective circuitry which,

in presence of an overcurrent condition, disables the output pulses

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

gone, the device auto−recovers. Also included is a bulk voltage

monitoring function (known as brown−out protection), an adjustable

overpower compensation, and a VCC OVP. The fault timer is reset by

any of these 3 conditions to ensure that the controller immediately

restarts when the condition disappears. Finally, an internal 4.0 ms

soft−start eliminates the traditional startup stress. NCP1338 can be

used in applications where the VCC supply voltage is delivered by an

external dc voltage source.

Features

• Free−Running Borderline/Critical Mode Quasi−Resonant Operation

• Current−Mode

• Soft−Skip Mode with Minimum Switching Frequency for Standby

• Auto−Recovery Short−Circuit Protection Independent of Auxiliary

Voltage

• Overvoltage Protection

• Brown−Out Protection

• Two Externally Triggerable Fault Comparators (one for a disable

function, and the other for a permanent latch)

• Internal 4.0 ms Soft−Start

• 500 mA Peak Current Drive Sink Capability

• 130 kHz Max Frequency

• Internal Leading Edge Blanking

• Internal Temperature Shutdown

• Direct Optocoupler Connection

• Dynamic Self−Supply with Levels of 12 V (On) and 10 V (Off)

• SPICE Models Available for TRANsient and AC Analysis

• These are Pb−Free Devices

Typical Applications

• AC−DC Adapters for Notebooks, etc.

• Offline Battery Chargers

• Consumer Electronics (DVD Players, Set−Top Boxes, TVs, etc.)

• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)

PDIP−7

P SUFFIX

CASE 626B

PIN CONNECTIONS

Device

Package

Shipping†

ORDERING INFORMATION

NCP1338PG

PDIP−7

(Pb−Free)

50 Units/Rail

www.onsemi.com

MARKING

DIAGRAM

A

= Assembly Location

WL, L

= Wafer Lot

YY, Y

= Year

WW, W = Work Week

G,

G

= Pb−Free Package

(Top View)

FB

BO

CS

GND

DRV

HV

VCC

NCP1338P

AWL

YYWWG

1

SOIC−7

D SUFFIX

CASE 751U

NCP1338DR2G

SOIC−7

(Pb−Free)

2500 Tape & Reel

†For information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specification

Brochure, BRD8011/D.

1

2

3

4

8

6

5

P1338

ALYW

G

1

8

7

(Note: Microdot may be in either location)

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