UC3845

更新时间： 2024-01-09 21:48:04

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
11页	100K
描述
CURRENTMODE 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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UC3845 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

UC3845 数据手册

UC2842/3/4/5

UC3842/3/4/5

CURRENT MODE PWM CONTROLLER

OPTIMIZED FOR OFF-LINE AND DC TO DC

CONVERTERS

LOW START-UP CURRENT (< 1 mA)

AUTOMATIC FEED FORWARD COMPENSA-

TION

PULSE-BY-PULSECURRENT LIMITING

ENHANCED LOAD RESPONSE CHARAC-

TERISTICS

UNDER-VOLTAGELOCKOUTWITHHYSTER-

ESIS

DOUBLE PULSE SUPPRESSION

HIGH CURRENT TOTEM POLE OUTPUT

INTERNALLY TRIMMED BANDGAP REFER-

ENCE

SO14

Minidip

logicto insure latchedoperation,a PWM compara-

torwhichalsoprovidescurrentlimitcontrol,andato-

tem pole output stage designed to source or sink

high peak current. The output stage, suitable for

drivingN-ChannelMOSFETs,islow intheoff-state.

500 KHz OPERATION

LOW R ERRORAMP

Differencesbetweenmembersof this familyarethe

under-voltage lockout thresholds and maximum

duty cycle ranges. The UC3842 and UC3844 have

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

suited off-line applications The corresponding

thresholds for the UC3843 and UC3845 are 8.5 V

and 7.9 V. The UC3842 and UC3843 can operate

to duty cycles approaching 100%. A range of the

zero to < 50 % is obtained by the UC3844 and

UC3845by theadditionof aninternaltoggleflip flop

which blanksthe outputoff every otherclock cycle.

DESCRIPTION

TheUC3842/3/4/5family ofcontrolICsprovidesthe

necessary features to implement off-line or DC to

DC fixed frequency current mode controlschemes

witha minimalexternalpartscount.Internallyimple-

mentedcircuitsincludeundervoltagelockoutfeatur-

ing start-up current less than 1 mA, a precisionref-

erencetrimmed foraccuracyat theerroramp input,

BLOCK DIAGRAM (toggle flip flop used only in U3844 and UC3845)

1/11

October 1998

12 3 4 5 6 7...11

中文翻译

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与UC3845相关器件

型号	品牌	获取价格	描述	数据表
UC3845_15	UTC	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
UC3845A	TI	获取价格	Current Mode PWM Controller
UC3845A	FCI	获取价格	High Performance Current Mode Controller
UC3845A	STMICROELECTRONICS	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3845A	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC3845A-BW	FCI	获取价格	Current Mode PWM Controller Low Start-Up and Operating Current
UC3845ACD	FCI-CONNECTOR	获取价格	Switching Regulator/Controller
UC3845ACS	FCI-CONNECTOR	获取价格	Switching Regulator/Controller
UC3845AD	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC3845AD	TI	获取价格	Current Mode PWM Controller

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