CS2841B
Automotive Current Mode
PWM Control Circuit
The CS2841B provides all the necessary features to implement
off-line fixed frequency current-mode control with a minimum
number of external components.
The CS2841B (a variation of the CS2843A) is designed specifically
for use in automotive operation. The low start threshold voltage of 8.0 V
(typ), and the ability to survive 40 V automotive load dump transients
are important for automotive subsystem designs. The CS2841 series
has a history of quality and reliability in automotive applications.
The CS2841B incorporates a precision temperature-controlled
oscillator with an internally trimmed discharge current to minimize
variations in frequency. Duty-cycles greater than 50% are also
possible. On board logic ensures that VREF is stabilized before the
output stage is enabled. Ion implant resistors provide tighter control of
undervoltage lockout.
Features
•ăOptimized for Off-Line Control
•ăInternally Trimmed Temperature Compensated Oscillator
•ăMaximum Duty-Cycle Clamp
•ăVREF Stabilized Before Output Stage Enabled
•ăLow Start-Up Current
•ăPulse-By-Pulse Current Limiting
•ăImproved Undervoltage Lockout
•ăDouble Pulse Suppression
•ă1.0 % Trimmed Bandgap Reference
•ăHigh Current Totem Pole Output
•ăPb-Free Packages are Available*
http://onsemi.com
8
1
14
1
PDIP-8
N SUFFIX
CASE 626
SOIC-14
D SUFFIX
CASE 751A
PIN CONNECTIONS AND
MARKING DIAGRAM
COMP
VFB
Sense
OSC
PDIP-8
VREF
VCC
VOUT
GND
COMP
NC
VFB
NC
Sense
NC
OSC
SOIC-14
VREF
NC
VCC
VCC PWR
VOUT
PWR GND
GND
CS2841B = Device Code
A
= Assembly Location
WL
= Wafer Lot
YY, Y
= Year
WW
= Work Week
G
= Pb-Free Package
*For additional information on our Pb-Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
©Ă Semiconductor Components Industries, LLC, 2008
1
March, 2008 - Rev. 8
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
Publication Order Number:
CS2841B/D