CS51021A Datasheet, PDF (1/11 Pages) ON Semiconductor – Enhanced Current Mode PWM Controller

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
CS51021A
CS51022A
CS51023A
CS51024A
Sleep/Synch
Synch
Sleep
Synch
Sleep
V_CC Start/Stop
8.25 V/7.7 V
8.25 V/7.7 V
13 V/7.7 V
13 V/7.7 V
Features
• 75 mA 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 mA Max Sleep Current (CS51022A/4A)
• Pb−Free Packages are Available*
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2006
1
February, 2006 − Rev. 8
http://onsemi.com
16
1
SOIC−16
D SUFFIX
CASE 751B
16
1
TSSOP−16
DTB SUFFIX
CASE 948F
PIN CONNECTIONS AND
MARKING DIAGRAMS
1
GATE
I_SENSE
SLEEP or SYNC
SLOPE
UV
OV
R_TC_T
I_SET
16
V_C
PGND
V_CC
V_REF
LGND
SS
COMP
V_FB
1
16
x
= Specific Device Code
A
= Assembly Location
WL, L = Wafer Lot
Y
= Year
WW, W = Work Week
G or G = Pb−Free Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
Publication Order Number:
CS51021A/D