TL2843

Manufacturer Part NumberTL2843
ManufacturerTexas Instruments
TL2843 datasheet
 

Specifications of TL2843

TopologyBoost, Flyback, ForwardControl MethodCurrent
Duty Cycle(max)(%)100Frequency(max)(khz)500
Uvlo Thresholds On/off(v)8.4/7.6Pin/package14SOIC, 8PDIP, 8SOIC
Vin(min)(v)7.8Vin(max)(v)30
Vout(min)(v)4.95Regulated Outputs(#)1
Operating Temperature Range(c)-40 to 85  
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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.
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.
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.
CURRENT-MODE PWM CONTROLLERS
SLVS038G − JANUARY 1989 − REVISED FEBRUARY 2008
COMP
ISENSE
RT/CT
NC − No internal connection
COMP
ISENSE
RT/CT
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
TL284x, TL384x
D PACKAGE
(TOP VIEW)
REF
1
14
NC
NC
2
13
VFB
V
3
12
CC
NC
VC
4
11
OUTPUT
5
10
6
9
GND
NC
7
8
POWER GROUND
D-8 OR P PACKAGE
(TOP VIEW)
REF
1
8
VFB
V
2
7
CC
OUTPUT
3
6
GND
4
5
Copyright  2008, Texas Instruments Incorporated
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TL2843 Summary of contents

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    ... 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. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty ...

  • Page 2

    ... MARKING TL3842P TL3843P TL3844P TL3845P TL3842 TL3842 TL3843 TL3843 TL3844 TL3844 TL3845 TL3845 TL3842 TL3842 TL3843 TL3843 TL3844 TL3844 TL3845 TL3845 TL2842P TL2843P TL2844P TL2845P TL2842 TL2842 TL2843 TL2843 TL2844 TL2844 TL2845 TL2845 TL2842 TL2842 TL2843 TL2843 TL2844 TL2844 TL2845 TL2845 ...

  • Page 3

    NOM 9 + − GND 7 RT/CT OSC Error Amplifier + 3 − VFB 1 COMP 5 ISENSE † The toggle flip-flop is present only in TL2844, TL2845, TL3844, and TL3845. Pin ...

  • Page 4

    TL284x, TL384x CURRENT-MODE PWM CONTROLLERS SLVS038G − JANUARY 1989 − REVISED FEBRUARY 2008 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Supply voltage (see Note 1) (I Analog input voltage range, V Output voltage, V (OUTPUT) O ...

  • Page 5

    V Ω Note 4 3.3 nF (unless otherwise specified reference section PARAMETER PARAMETER Output voltage mA, O Line regulation V ...

  • Page 6

    TL284x, TL384x CURRENT-MODE PWM CONTROLLERS SLVS038G − JANUARY 1989 − REVISED FEBRUARY 2008 electrical characteristics over recommended operating free-air temperature range, V Ω Note 4 3.3 nF (unless otherwise specified) (continued ...

  • Page 7

    V Ω Note 4 3.3 nF (unless otherwise specified) (continued supply voltage PARAMETER PARAMETER Start-up current Operating supply current VFB and ISENSE at ...

  • Page 8

    TL284x, TL384x CURRENT-MODE PWM CONTROLLERS SLVS038G − JANUARY 1989 − REVISED FEBRUARY 2008 Z i NOTE A: Error amplifier can source or sink up to 0.5 mA (see Note NOTE A: Peak current ...

  • Page 9

    DEAD TIME vs TIMING CAPACITANCE 100 ≥ 5 kΩ 25° 0.4 0 − Timing Capacitance − Figure 4 open-loop laboratory ...

  • Page 10

    TL284x, TL384x CURRENT-MODE PWM CONTROLLERS SLVS038G − JANUARY 1989 − REVISED FEBRUARY 2008 shutdown technique The PWM controller (see Figure 7) can be shut down by two methods: either raise the voltage at ISENSE above pull the ...

  • Page 11

    ... ACTIVE TL2842P ACTIVE TL2842PE4 ACTIVE TL2843D ACTIVE TL2843D-8 ACTIVE TL2843DE4 ACTIVE TL2843DE4-8 ACTIVE TL2843DG4 ACTIVE TL2843DG4-8 ACTIVE TL2843DR ACTIVE TL2843DR-8 ACTIVE TL2843DRE4 ACTIVE TL2843DRE4-8 ACTIVE TL2843DRG4 ACTIVE PACKAGE OPTION ADDENDUM Package Package Pins Package Type Drawing Qty SOIC Green (RoHS & ...

  • Page 12

    ... Orderable Device Status TL2843DRG4-8 ACTIVE TL2843P ACTIVE TL2843PE4 ACTIVE TL2844D ACTIVE TL2844D-8 ACTIVE TL2844DE4 ACTIVE TL2844DE4-8 ACTIVE TL2844DG4 ACTIVE TL2844DG4-8 ACTIVE TL2844DR ACTIVE TL2844DR-8 ACTIVE TL2844DRE4 ACTIVE TL2844DRE4-8 ACTIVE TL2844DRG4 ACTIVE TL2844DRG4-8 ACTIVE TL2844P ACTIVE TL2844PE4 ACTIVE TL2845D ACTIVE ...

  • Page 13

    Orderable Device Status TL2845DRE4-8 ACTIVE TL2845DRG4 ACTIVE TL2845DRG4-8 ACTIVE TL2845P ACTIVE TL2845PE4 ACTIVE TL3842D ACTIVE TL3842D-8 ACTIVE TL3842DE4 ACTIVE TL3842DE4-8 ACTIVE TL3842DG4 ACTIVE TL3842DG4-8 ACTIVE TL3842DR ACTIVE TL3842DR-8 ACTIVE TL3842DRE4 ACTIVE TL3842DRE4-8 ACTIVE TL3842DRG4 ACTIVE TL3842DRG4-8 ACTIVE TL3842P ...

  • Page 14

    Orderable Device Status TL3843DR-8 ACTIVE TL3843DR-8E4 ACTIVE TL3843DRE4 ACTIVE TL3843DRG4 ACTIVE TL3843DRG4-8 ACTIVE TL3843P ACTIVE TL3843PE4 ACTIVE TL3844D ACTIVE TL3844D-8 ACTIVE TL3844DE4 ACTIVE TL3844DE4-8 ACTIVE TL3844DG4 ACTIVE TL3844DG4-8 ACTIVE TL3844DR ACTIVE TL3844DR-8 ACTIVE TL3844DRE4 ACTIVE TL3844DRE4-8 ACTIVE TL3844DRG4 ...

  • Page 15

    Orderable Device Status TL3845DG4-8 ACTIVE TL3845DR ACTIVE TL3845DR-8 ACTIVE TL3845DRE4 ACTIVE TL3845DRE4-8 ACTIVE TL3845DRG4 ACTIVE TL3845DRG4-8 ACTIVE TL3845P ACTIVE TL3845PE4 ACTIVE (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: ...

  • Page 16

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing TL2842DR SOIC TL2842DR-8 SOIC TL2843DR SOIC TL2843DR-8 SOIC TL2844DR SOIC TL2844DR-8 SOIC TL2845DR SOIC TL2845DR-8 SOIC TL3842DR SOIC TL3842DR-8 SOIC TL3843DR SOIC TL3843DR-8 SOIC TL3844DR SOIC ...

  • Page 17

    ... Device Package Type TL2842DR SOIC TL2842DR-8 SOIC TL2843DR SOIC TL2843DR-8 SOIC TL2844DR SOIC TL2844DR-8 SOIC TL2845DR SOIC TL2845DR-8 SOIC TL3842DR SOIC TL3842DR-8 SOIC TL3843DR SOIC TL3843DR-8 SOIC TL3844DR SOIC TL3844DR-8 SOIC TL3845DR SOIC TL3845DR-8 SOIC ...

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  • Page 23

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...