Datasheet > TL3843DG4

TL3843DG4

更新时间： 2024-11-20 07:04:35

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
21页	577K
描述
CURRENT-MODE PWM CONTROLLERS

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TL3843DG4 数据手册

TL284x, TL384x

CURRENT-MODE PWM CONTROLLERS

SLVS038G − JANUARY 1989 − REVISED FEBRUARY 2008

D PACKAGE

(TOP VIEW)

Optimized for Off-Line and dc-to-dc

Converters

Low Start-Up Current (<1 mA)

COMP

VFB

ISENSE

REF

13 NC

Automatic Feed-Forward Compensation

Pulse-by-Pulse Current Limiting

Enhanced Load-Response Characteristics

Undervoltage Lockout With Hysteresis

Double-Pulse Suppression

V_CC

OUTPUT

GND

POWER GROUND

RT/CT

High-Current Totem-Pole Output

Internally Trimmed Bandgap Reference

500-kHz Operation

NC − No internal connection

D-8 OR P PACKAGE

(TOP VIEW)

Error Amplifier With Low Output

Resistance

COMP

VFB

ISENSE

RT/CT

REF

V_CC

OUTPUT

GND

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.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7...21

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与TL3843DG4相关器件

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TL3843DG4-8	TI	获取价格	CURRENT-MODE PWM CONTROLLERS
TL3843DR	TI	获取价格	CURRENT-MODE PWM CONTROLLERS
TL3843DR-8	TI	获取价格	CURRENT-MODE PWM CONTROLLERS
TL3843DR-8E4	TI	获取价格	CURRENT-MODE PWM CONTROLLERS
TL3843DRE4	TI	获取价格	CURRENT-MODE PWM CONTROLLERS
TL3843DRG4	TI	获取价格	CURRENT-MODE PWM CONTROLLERS
TL3843DRG4-8	TI	获取价格	CURRENT-MODE PWM CONTROLLERS
TL3843P	TI	获取价格	CURRENT-MODE PWM CONTROLLERS
TL3843PE4	TI	获取价格	CURRENT-MODE PWM CONTROLLERS
TL3843Y	TI	获取价格	CURRENT-MODE PWM CONTROLLERS

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