Datasheet > TL3842DE4

TL3842DE4

更新时间： 2024-11-20 03:59:31

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
18页	400K
描述
CURRENT-MODE PWM CONTROLLERS

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TL3842DE4 数据手册

TL284x, TL384x

CURRENT-MODE PWM CONTROLLERS

SLVS038F – JANUARY 1989 – REVISED FEBRUARY 2003

D PACKAGE

(TOP VIEW)

Optimized for Off-Line and dc-to-dc

Converters

Low Start-Up Current (<1 mA)

COMP

REF

13 NC

Automatic Feed-Forward Compensation

Pulse-by-Pulse Current Limiting

Enhanced Load-Response Characteristics

Undervoltage Lockout With Hysteresis

Double-Pulse Suppression

VFB

ISENSE

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

Designed to Be Interchangeable With

UC2842 and UC3842 Series

OUTPUT

GND

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.

TypicalUVLOthresholdsof16V(on)and10V(off)ontheTLx842andTLx844devicesmakethemideallysuited

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-series 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...18

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TL3842DE4 替代型号

型号	品牌	替代类型	描述	数据表
TL3842DR	TI	完全替代	CURRENT-MODE PWM CONTROLLERS
TL3842D	TI	完全替代	CURRENT-MODE PWM CONTROLLERS

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TL3842DG4-8	TI	获取价格	CURRENT-MODE PWM CONTROLLERS
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TL3842DR-8	TI	获取价格	CURRENT-MODE PWM CONTROLLERS
TL3842DRE4	TI	获取价格	CURRENT-MODE PWM CONTROLLERS
TL3842DRE4-8	TI	获取价格	CURRENT-MODE PWM CONTROLLERS
TL3842DRG4	TI	获取价格	CURRENT-MODE PWM CONTROLLERS
TL3842DRG4-8	TI	获取价格	CURRENT-MODE PWM CONTROLLERS
TL3842P	TI	获取价格	CURRENT-MODE PWM CONTROLLERS

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