
Semiconductor Components Industries, LLC, 2005
September, 2005 Rev. 7
1
Publication Order Number:
CS2841B/D
CS2841B
Automotive Current Mode
PWM Control Circuit
The CS2841B provides all the necessary features to implement
offline fixed frequency currentmode 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 temperaturecontrolled
oscillator with an internally trimmed discharge current to minimize
variations in frequency. Dutycycles greater than 50% are also
possible. On board logic ensures that V
REF
is stabilized before the
output stage is enabled. Ion implant resistors provide tighter control of
undervoltage lockout.
Features
Optimized for OffLine Control
Internally Trimmed Temperature Compensated Oscillator
Maximum DutyCycle Clamp
V
REF
Stabilized Before Output Stage Enabled
Low StartUp Current
PulseByPulse Current Limiting
Improved Undervoltage Lockout
Double Pulse Suppression
1.0 % Trimmed Bandgap Reference
High Current Totem Pole Output
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.
CS2841B = Device Code
A
= Assembly Location
WL
= Wafer Lot
YY, Y
= Year
WW
= Work Week
G
= PbFree Package
PDIP8
N SUFFIX
CASE 626
PIN CONNECTIONS AND
MARKING DIAGRAM
V
REF
V
CC
V
OUT
GND
COMP
V
FB
Sense
OSC
1
8
SOIC14
D SUFFIX
CASE 751A
GND
OSC
PWR GND
NC
V
OUT
Sense
V
CC
PWR
NC
V
CC
V
FB
NC
NC
V
REF
COMP
1
14
SOIC14
PDIP8
http://onsemi.com
C
A
Y
C
A
1
1
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
ORDERING INFORMATION