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TL3843PE4 Datasheet(PDF) 1 Page - Texas Instruments

Part No. TL3843PE4
Description  CURRENT-MODE PWM CONTROLLERS
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

TL3843PE4 Datasheet(HTML) 1 Page - Texas Instruments

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TL284x, TL384x
CURRENT-MODE PWM CONTROLLERS
SLVS038G − JANUARY 1989 − REVISED FEBRUARY 2008
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D Optimized for Off-Line and dc-to-dc
Converters
D Low Start-Up Current (<1 mA)
D Automatic Feed-Forward Compensation
D Pulse-by-Pulse Current Limiting
D Enhanced Load-Response Characteristics
D Undervoltage Lockout With Hysteresis
D Double-Pulse Suppression
D High-Current Totem-Pole Output
D Internally Trimmed Bandgap Reference
D 500-kHz Operation
D Error Amplifier With Low Output
Resistance
D Designed to Be Interchangeable With
UC2842 and UC3842 Series
description/ordering information
The TL284x and TL384x series of control integrated
circuits provide the features that are necessary to
implement off-line or dc-to-dc fixed-frequency current-mode control schemes, with a minimum number of
external components. Some of the internally implemented circuits are an undervoltage lockout (UVLO),
featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error
amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM)
comparator (that also provides current-limit control), and a totem-pole output stage designed to source or sink
high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.
Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges.
Typical UVLO thresholds of 16 V (on) and 10 V (off) on the TLx842 and TLx844 devices make them ideally suited
to off-line applications. The corresponding typical thresholds for the TLx843 and TLx845 devices are 8.4 V (on)
and 7.6 V (off). The TLx842 and TLx843 devices can operate to duty cycles approaching 100%. A duty-cycle
range of 0 to 50% is obtained by the TLx844 and TLx845 by the addition of an internal toggle flip-flop, which
blanks the output off every other clock cycle.
The TL284x-series devices are characterized for operation from −40
°C to 85°C. The TL384x devices are
characterized for operation from 0
°C to 70°C.
Copyright
 2008, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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COMP
NC
VFB
NC
ISENSE
NC
RT/CT
REF
NC
VCC
VC
OUTPUT
GND
POWER GROUND
D PACKAGE
(TOP VIEW)
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8
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COMP
VFB
ISENSE
RT/CT
REF
VCC
OUTPUT
GND
D-8 OR P PACKAGE
(TOP VIEW)
NC − No internal connection


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