NCP4326 datasheet(1/30 Pages) ONSEMI

No. de pieza	NCP4326

Descripción Electrónicos	Secondary Controller for Multi?뭀utput Quasi?뭃esonant Switchmode Power Supplies

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Fabricante Electrónico	ONSEMI [ON Semiconductor]

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September, 2005 − Rev. 1

1

Publication Order Number:

NCP4326/D

NCP4326

Secondary Controller for

Multi−Output

Quasi−Resonant

Switchmode Power

Supplies

This secondary controller significantly improves the overall

efficiency and cross−regulation figures when used in a Switchmode

Power Supply. Compared to traditional regulation schemes, the

NCP4326 provides superior performance in cross−regulation by

individually regulating outputs. Powered from a main winding, the

device actuates two independent switches that precisely adjust the

considered outputs to resistor−selectable voltages. This controller also

integrates a precision reference voltage, which together with a

dedicated operational amplifier reduces the feedback loop elements to

the minimum. In the end three independent output voltages can be

controlled by a single device.

A skip cycle feature improves the stand by power in light load

condition. Finally, dedicated shutdown pins offer an easy mean to

disable the secondary outputs in applications where a low standby

power performance is key.

Features

• 0% to 100% Duty Cycle Range

• Integrated Shunt Regulator for Optocoupler Control

• Internal Voltage Reference (1.25 V, 1% @ 25°C)

• 2 Independent Power MOSFET Drivers

• Enable/Disable for Each Driver

• Independent Soft−Starts on both Output Drivers

• Independent Skip Cycle on both Output Drivers

• Standby Pin

• 580 / 650 mA Peak Current Source/Sink Driver Capability

• Synchronization Pin

• 5 V Undervoltage Lock−Out on Vcc

• Pb−Free Package is Available

Applications

• Consumer Electronics Applications:

DVD, Set Top Box, CDR, Game Console

• Any Multi−Output Voltage Quasi−Resonant SMPS

http://onsemi.com

MARKING DIAGRAM

SOIC−16

D SUFFIX

CASE 751B

NCP4326DG

AWLYWW

1

A

= Assembly Location

WL = Wafer Lot

Y

= Year

WW = Work Week

G

= Pb−Free Device

(Bottom View)

Device

Package

Shipping{

ORDERING INFORMATION

NCP4326DR2

3000 Tape & Reel

SOIC−16

†For information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specifications

Brochure, BRD8011/D.

PIN CONNECTIONS

CP1

FB1

EN2

CP2

FB2

Ct

Sync

CPm

EN1

GND

Flux

DRV1

Vcc

DRV2

STBY

FBm

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

NCP4326DR2G

3000 Tape & Reel

SOIC−16

(Pb−Free)

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