
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 ACDC
or DCDC primary side control. Several features are included
eliminating the additional components needed to implement them
externally. In addition to low startup current (75 A) 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 A
maximum IC current consumption. The CS51021A/2A/3A/4A family
is available in a 16 lead narrow body SOIC package.
Device
Sleep/Synch
V
CC
Start/Stop
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
75 A Max. Startup Current
Fixed Frequency Current Mode Control
1.0 MHz Switching Frequency
Undervoltage Protection Monitor
Overvoltage Protection Monitor with Programmable Hysteresis
Programmable Dual Threshold Overcurrent Protection with
Delayed Restart
Programmable Soft Start
Accurate Maximum Duty Cycle Limit
Programmable Slope Compensation
Leading Edge Current Sense Blanking
1.0 A Sink/Source Gate Drive
Bidirectional Synchronization (CS51021A/3A)
50 ns PWM Propagation Delay
100 A Max Sleep Current (CS51022A/4A)
PbFree Packages are Available*
*For additional information on our PbFree strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
x
A
WL, L
Y
WW, W = Work Week
G or
= PbFree Package
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
SOIC16
D SUFFIX
CASE 751B
1
16
V
FB
I
SET
1
C
A
16
COMP
R
T
C
T
SS
OV
LGND
UV
V
REF
SLOPE
V
CC
SLEEP or SYNC
PGND
I
SENSE
V
C
GATE
PIN CONNECTIONS AND
MARKING DIAGRAMS
http://onsemi.com
1
16
TSSOP16
DTB SUFFIX
CASE 948F
C
0
A
1
16
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
ORDERING INFORMATION