UC3844BD

更新时间： 2024-02-23 20:52:46

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		开关光电二极管控制器
页数	文件大小	规格书
15页	137K
描述
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

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中文翻译

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技术参数
数据手册

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UC3844BD 技术参数

生命周期：	Obsolete	包装说明：	DIE,
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.65
Is Samacsys：	N	模拟集成电路 - 其他类型：	SWITCHING CONTROLLER
控制模式：	CURRENT-MODE	控制技术：	PULSE WIDTH MODULATION
最大输入电压：	30 V	JESD-30 代码：	X-XUUC-N8
功能数量：	1	端子数量：	8
最高工作温度：	70 °C	最低工作温度：
最大输出电流：	1 A	标称输出电压：	2.5 V
封装主体材料：	UNSPECIFIED	封装代码：	DIE
封装形状：	UNSPECIFIED	封装形式：	UNCASED CHIP
认证状态：	Not Qualified	最大供电电流 (Isup)：	25 mA
表面贴装：	YES	切换器配置：	SINGLE
最大切换频率：	500 kHz	技术：	BIPOLAR
温度等级：	COMMERCIAL	端子形式：	NO LEAD
端子位置：	UPPER	Base Number Matches：	1

UC3844BD 数据手册

UC2842B/3B/4B/5B

UC3842B/3B/4B/5B

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

TRIMMED OSCILLATOR FOR PRECISE FRE-

QUENCY CONTROL

OSCILLATOR FREQUENCY GUARANTEED

AT 250kHz

CURRENT MODE OPERATION TO 500kHz

AUTOMATIC FEED FORWARD COMPENSA-

TION

Minidip

SO8

LATCHING PWM FOR CYCLE-BY-CYCLE

CURRENT LIMITING

INTERNALLY TRIMMED REFERENCE WITH

UNDERVOLTAGE LOCKOUT

HIGH CURRENT TOTEM POLE OUTPUT

UNDERVOLTAGE LOCKOUT WITH HYSTER-

ESIS

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-UPAND OPERATINGCURRENT

Differencesbetween members of this family are the

under-voltagelockoutthresholdsandmaximum duty

cycle ranges. The UC3842B and UC3844B have

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

suitedoff-lineapplicationsThecorrespondingthresh-

oldsfortheUC3843BandUC3845Bare8.5Vand7.9

V. The UC3842B and UC3843B can operateto duty

cycles approaching100%. A range of the zero to <

50 % is obtainedby the UC3844Band UC3845Bby

theadditionofan internaltoggleflipflopwhichblanks

theoutputoff everyotherclock cycle.

DESCRIPTION

TheUC384xBfamilyofcontrolICsprovidesthenec-

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 UC3844B and UC3845B)

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

UC3842B

CURRENT

SENSE

COMPARATOR

D95IN331

1/15

March 1999

12 3 4 5 6 7...15

中文翻译

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与UC3844BD相关器件

型号	品牌	获取价格	描述	数据表
UC3844BD1	STMICROELECTRONICS	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3844BD1	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844BD1G	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844BD1R2	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844BD1R2	MOTOROLA	获取价格	1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8, PLASTIC, SO-8
UC3844BD1R2G	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844BDG	ONSEMI	获取价格	High Performance Current Mode Controllers
UC3844BDR2	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844BDR2G	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844BG	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS

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