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CS2843A Scheda tecnica(PDF) 1 Page - ON Semiconductor

Il numero della parte CS2843A
Spiegazioni elettronici  Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout
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© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 4
1
Publication Order Number:
CS2842A/D
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
x
= 2 or 3
y
= 2 or 3
A
= Assembly Location
WL, L
= Wafer Lot
YY, Y
= Year
WW, W = Work Week
DIP−8
N SUFFIX
CASE 626
1
8
SO−8
D SUFFIX
CASE 751
1
8
SO−14
D SUFFIX
CASE 751A
1
14
1
8
x84yA
AWL
YYWW
MARKING
DIAGRAM
1
x84yA
ALYWX
8
1
CSx84yA
AWLYWW
14
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
ORDERING INFORMATION


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