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CS2843A Datasheet PDF : 10 Pages
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CS2842A, CS3842A,
CS2843A, CS3843A
Off−Line Current Mode
PWM Control Circuit with
Undervoltage Lockout
The CS284XA, CS384XA provides all the necessary features to
implement off−line fixed frequency current−mode control with a
minimum number of external components.
The CS384XA family incorporates a new precision
temperature−controlled oscillator with an internally trimmed
discharge current to minimize variations in frequency. A precision
duty−cycle clamp eliminates the need for an external oscillator when a
50% duty−cycle is used. 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.
Other features include low startup current, pulse−by−pulse current
limiting, and a high−current totem pole output for driving capacitive
loads, such as the gate of power MOSFET. The output is LOW in the
off state, consistent with N−channel devices.
The CS384XA series of current−mode control ICs are available in
8 and14 lead packages for surface mount (SO) applications as well as
8 lead PDIP packages.
Features
• Optimized for Off−line Control
• Internally Trimmed Temperature Compensated Oscillator
• Maximum Duty−Cycle Clamp
• VREF Stabilized Before Output Stage is Enabled
• Low Startup Current
• Pulse−By−Pulse Current Limiting
• Improved Undervoltage Lockout
• Double Pulse Suppression
• 1.0% Trimmed Bandgap Reference
• High Current Totem Pole Output
http://onsemi.com
MARKING
DIAGRAM
8
8
1
8
1
DIP−8
N SUFFIX
CASE 626
SO−8
D SUFFIX
CASE 751
x84yA
AWL
YYWW
1
8
x84yA
ALYWX
14
1
SO−14
D SUFFIX
CASE 751A
1
14
CSx84yA
AWLYWW
1
x
= 2 or 3
y
= 2 or 3
A
= Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
1
July, 2006 − Rev. 4
Publication Order Number:
CS2842A/D
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