CS2841B Datasheet, PDF (1/10 Pages) Cherry Semiconductor Corporation – Automotive Current Mode PWM Control Circuit

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 V_REF is stabilized before the
output stage is enabled. Ion implant resistors provide tighter control of
undervoltage lockout.
Features
• Optimized for Off−Line Control
• Internally Trimmed Temperature Compensated Oscillator
• Maximum Duty−Cycle Clamp
• V_REF Stabilized Before Output Stage Enabled
• Low Start−Up Current
• Pulse−By−Pulse Current Limiting
• Improved Undervoltage Lockout
• Double Pulse Suppression
• 1.0 % Trimmed Bandgap Reference
• High Current Totem Pole Output
• Pb−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
V_FB
Sense
OSC
PDIP−8
V_REF
V_CC
V_OUT
GND
COMP
NC
V_FB
NC
Sense
NC
OSC
SOIC−14
V_REF
NC
V_CC
V_CC PWR
V_OUT
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.
© Semiconductor Components Industries, LLC, 2005
1
September, 2005 − Rev. 7
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