NCP1215 Ver la hoja de datos (PDF) - ON Semiconductor

Número de pieza

componentes Descripción

Lista de partido

NCP1215

Low Cost Variable OFF Time Switched Mode Power Supply Controller

ON Semiconductor 

NCP1215

Product Preview

Low Cost Variable OFF Time

Switched Mode Power

Supply Controller

The NCP1215 is a controller for low power off−line flyback

Switchemode Power Supplies (SMPS) featuring low size, weight and

cost constraints together with a good low standby power performance.

The operating principle uses switching frequency reduction at light

load by increasing the OFF Time. Also, when OFF Time expands, the

peak current is gradually reduced down to approximately 1/4 of the

maximum peak current to prevent from exciting the transformer

mechanical resonances. The risk of acoustic noise is thus greatly

diminished while keeping good standby power performance.

A low power internal supply block also ensures very low current

consumption at startup without hampering the standby power

performance.

A special primary current sensing technique minimizes the impact

of SMPS switching on control IC operation. The choice of peak

voltage across the current sense resistor allows dissipation to be

further reduced. The negative current sensing technique offers

advantages over a traditional approach by avoiding the voltage drop

incurred by traditional MOSFET source sensing. Thus, the IC drive

capability is greatly improved.

Finally, the bulk input ripple ensures a natural frequency dithering

which smooths the EMI signature.

Features

• Pb−Free Package is Available

• Variable OFF Time Control Method

• Very Low Current Consumption at Startup

• Natural Frequency Dithering for Improved EMI Signature

• Current Mode Control Operation

• Peak Current Compression Reduces Transformer Noise

• Programmable Current Sense Resistor Peak Voltage

• Undervoltage Lockout

Typical Applications

• Auxiliary Power Supply

• Standby Power Supply

• AC−DC Adapter

• Off−line Battery Charger

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

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

© Semiconductor Components Industries, LLC, 2004

1

October, 2004 − Rev. 2

http://onsemi.com

8

1

SOIC−8

D SUFFIX

CASE 751

MARKING

DIAGRAMS

8

P1215

ALYW

1

TSOP−6

6

6

(SOT23−6, SC59−6)

SN SUFFIX

FAAYW

1

CASE 318G

1

FAA = Specific Device Code

A = Assembly Location

L = Wafer Lot

Y = Year

W = Work Week

PIN CONNECTIONS

SOIC−8

FB 1

8 NC

CT 2

7 NC

CS 3

GND 4

6 VCC

5 Gate

(Top View)

TSOP−6

CS 1

6 Gate

GND 2

5 VCC

CT 3

4 FB

(Top View)

ORDERING INFORMATION

Device

Package

Shipping†

NCP1215DR2 SOIC−8 2500 Tape & Reel

NCP1215DR2G

NCP1215SNT1

SOIC−8

(Pb−Free)

TSOP−6

2500 Tape & Reel

3000 Tape & Reel

†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.

Publication Order Number:

NCP1215/D

Share Link: