© Semiconductor Components Industries, LLC, 2006

February, 2006 − Rev. 8

1

Publication Order Number:

CS51021A/D

CS51021A, CS51022A,

CS51023A, CS51024A

Enhanced Current Mode

PWM Controller

The CS51021A/2A/3A/4A Fixed Frequency PWM Current Mode

Controller family provides all necessary features required for AC−DC

or DC−DC primary side control. Several features are included

eliminating the additional components needed to implement them

externally. In addition to low startup current (75

mA) and high

frequency operation capability, the CS51021A/2A/3A/4A family

includes overvoltage and undervoltage monitoring, externally

programmable dual threshold overcurrent protection, current sense

leading edge blanking, current slope compensation, accurate duty cycle

control and an externally available 5.0 V reference. The CS51021A

and CS51023A feature bidirectional synchronization capability, while

the CS51022A and CS51024A offer a sleep mode with 100

mA

maximum IC current consumption. The CS51021A/2A/3A/4A family

is available in a 16 lead narrow body SOIC package.

Device

Sleep/Synch

CS51021A

Synch

8.25 V/7.7 V

CS51022A

Sleep

8.25 V/7.7 V

CS51023A

Synch

13 V/7.7 V

CS51024A

Sleep

13 V/7.7 V

Features

Delayed Restart

*For additional information on our Pb−Free strategy and soldering details, please

download the ON Semiconductor Soldering and Mounting Techniques

Reference Manual, SOLDERRM/D.

x

= Specific Device Code

A

= Assembly Location

WL, L

= Wafer Lot

Y

= Year

WW, W = Work Week

G or

G = Pb−Free Package

SOIC−16

D SUFFIX

CASE 751B

1

16

1

16

COMP

SS

OV

LGND

UV

SLOPE

SLEEP or SYNC

PGND

GATE

PIN CONNECTIONS AND

MARKING DIAGRAMS

http://onsemi.com

1

16

TSSOP−16

DTB SUFFIX

CASE 948F

116

See detailed ordering and shipping information in the package

dimensions section on page 9 of this data sheet.

ORDERING INFORMATION