UC3845TD

更新时间： 2024-02-26 06:19:43

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数	文件大小	规格书
15页	230K
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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UC3845TD 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

UC3845TD 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

comparatorwhich also providescurrentlimitcontrol,

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 in the off-

state.

LOW START-UP AND OPERATING CURRENT

Differences between members of this family are the

under-voltage lockout thresholds and maximum duty

cycle ranges. The UC3842T and UC3844T have

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

suited to off-line applications The corresponding

thresholds for the UC3843T and UC3845T are 8.5 V

and 7.9 V. The UC3842T and UC3843T can operate

to duty cycles approaching 100%. A range of zero to

< 50 % is obtained by the UC3844T and UC3845T by

the addition of an internal toggle flip flop which blanks

the output off every other clock cycle.

DESCRIPTION

The UC384XT family of control ICs provides the

necessary features to implement off-line or DC to

DC fixed frequency current mode control schemes

with a minimal external parts count. Internally imple-

mented circuits include a trimmed oscillator for pre-

cise DUTY CYCLE CONTROL under voltage lock-

outfeaturing start-up current less than 0.5mA, a pre-

cision reference trimmed for accuracy at the error

amp input, logic to insure latched operation, 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

September 2001

1/15

12 3 4 5 6 7...15

中文翻译

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与UC3845TD相关器件

型号	品牌	获取价格	描述	数据表
UC3845TN	ETC	获取价格	Analog IC
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

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