Datasheet > UC3845TN

UC3845TN

更新时间： 2024-02-14 17:59:31

品牌	Logo	应用领域
其他 - ETC		模拟IC
页数	文件大小	规格书
15页	133K
描述
Analog IC

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中文翻译

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技术参数
数据手册

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UC3845TN 技术参数

生命周期：	Obsolete	包装说明：	DFP, FL14,.25
Reach Compliance Code：	unknown	风险等级：	5.84
Is Samacsys：	N	控制模式：	CURRENT-MODE
JESD-30 代码：	R-XDFP-F14	端子数量：	14
最高工作温度：	70 °C	最低工作温度：
最大输出电流：	0.2 A	封装主体材料：	CERAMIC
封装代码：	DFP	封装等效代码：	FL14,.25
封装形状：	RECTANGULAR	封装形式：	FLATPACK
认证状态：	Not Qualified	子类别：	Switching Regulator or Controllers
表面贴装：	YES	最大切换频率：	500 kHz
技术：	BIPOLAR	温度等级：	COMMERCIAL
端子形式：	FLAT	端子节距：	1.27 mm
端子位置：	DUAL	Base Number Matches：	1

UC3845TN 数据手册

UC3842T UC3843T

UC3844T UC3845T

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 UC3842T and UC3844T have

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

suited to off-line applications The corresponding

thresholdsfor the UC3843T and UC3845Tare 8.5 V

and 7.9V. The UC3842Tand UC3843Tcanoperate

to dutycycles approaching100%.A rangeof zeroto

<50 %isobtainedbytheUC3844TandUC3845Tby

theadditionofan internaltoggleflipflopwhichblanks

theoutputoff everyotherclock cycle.

DESCRIPTION

The UC384XT family of control ICs provides the

necessary features to implement off-line or DC to

DC fixed frequency current mode controlschemes

witha minimalexternalpartscount.Internallyimple-

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 UC3844T and UC3845T)

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

D95IN331

1/15

September 2001

12 3 4 5 6 7...15

中文翻译

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与UC3845TN相关器件

型号	品牌	获取价格	描述	数据表
UC3845W	TI	获取价格	IC,SMPS CONTROLLER,CURRENT-MODE,BIPOLAR,FP,14PIN,CERAMIC
UC3846	TI	获取价格	Current Mode PWM Controller
UC3846	FAIRCHILD	获取价格	SMPS Controller
UC3846	UTC	获取价格	LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS
UC3846	CONSONANCE	获取价格	Current Mode PWM Controller
UC3846_15	UTC	获取价格	CURRENT MODE PWM CONTROLLER
UC3846DW	ROCHESTER	获取价格	0.5 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16, GREEN, SOIC-16
UC3846DW	TI	获取价格	Current Mode PWM Controller
UC3846DWG4	TI	获取价格	Current Mode PWM Controller
UC3846DWTR	TI	获取价格	Current Mode PWM Controller

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