UC3842AD1

更新时间： 2024-11-22 22:11:27

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		控制器
页数	文件大小	规格书
15页	131K
描述
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

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中文翻译

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数据手册
替代型号

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UC3842AD1 数据手册

UC2842A/3A/4A/5A

UC3842A/3A/4A/5A

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

TRIMMED OSCILLATOR DISCHARGE CUR-

RENT

CURRENT MODE OPERATION TO 500kHz

AUTOMATIC FEED FORWARD COMPENSA-

TION

LATCHING PWM FOR CYCLE-BY-CYCLE

CURRENT LIMITING

INTERNALLY TRIMMED REFERENCE WITH

UNDERVOLTAGE LOCKOUT

HIGH CURRENT TOTEM POLE OUTPUT

UNDERVOLTAGE LOCKOUT WITH HYSTER-

ESIS

Minidip

SO8

comparatorwhichalsoprovidescurrentlimitcontrol,

and a totem pole output stage designed to source

orsinkhighpeakcurrent.Theoutputstage,suitable

for driving N-Channel MOSFETs, is low in the off-

state.

LOW START-UP CURRENT (< 0.5mA)

DOUBLE PULSE SUPPRESSION

Differencesbetween members of this family are the

under-voltagelockoutthresholdsandmaximum duty

cycle ranges. The UC3842A and UC3844A have

UVLO thresholds of 16V (on) and 10V (off), ideally

suitedoff-lineapplicationsThecorrespondingthresh-

olds for the UC3843A and UC3845A are 8.5 V and

7.9V. The UC3842A and UC3843A can operate to

dutycyclesapproaching100%.Arangeofthezeroto

<50%is obtainedbytheUC3844AandUC3845Aby

theadditionofan internaltoggleflipflopwhichblanks

theoutputoff everyotherclock cycle.

DESCRIPTION

TheUC384xAfamilyofcontrolICsprovidesthenec-

essary features to implement off-line or DC to DC

fixedfrequencycurrent modecontrol schemes with

a minimal external parts count. Internally imple-

mentedcircuits includea trimmed oscillator for pre-

cise DUTY CYCLE CONTROL under voltagelock-

outfeaturingstart-upcurrentlessthan0.5mA,a pre-

cision reference trimmed for accuracy at the error

ampinput,logicto insurelatchedoperation,a PWM

BLOCK DIAGRAM (toggle flip flop used only in UC3844A and UC3845A)

UVLO

34V

REF

VREF

5V 50mA

S/R

GROUND

INTERNAL

BIAS

2.50V

VREF GOOD

LOGIC

OUTPUT

RT/CT

OSC

ERROR AMP.

VFB

PWM

LATCH

COMP

CURRENT

SENSE

CURRENT

SENSE

COMPARATOR

UC3842A

D95IN331

1/15

March 1999

12 3 4 5 6 7...15

中文翻译

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UC3842AD1 替代型号

型号	品牌	替代类型	描述	数据表
UC2842BD1013TR	STMICROELECTRONICS	功能相似	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3842BD1	STMICROELECTRONICS	功能相似	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

与UC3842AD1相关器件

型号	品牌	获取价格	描述	数据表
UC3842AD8	TI	获取价格	Current Mode PWM Controller
UC3842AD8G4	TI	获取价格	Current Mode PWM Controller
UC3842AD8TR	TI	获取价格	Current Mode PWM Controller
UC3842AD8TRG4	TI	获取价格	具有 16V/10V UVLO 和 100% 占空比、温度范围为 0°C 至 70°C 的
UC3842ADG	ONSEMI	获取价格	High Performance Current Mode Controllers
UC3842ADG4	TI	获取价格	具有 16V/10V UVLO 和 100% 占空比、温度范围为 0°C 至 70°C 的
UC3842ADM	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC3842ADMT	ETC	获取价格	Current-Mode SMPS Controller
UC3842ADM-TR	MICROSEMI	获取价格	暂无描述
UC3842ADR2	ONSEMI	获取价格	High Performance Current Mode Controllers

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