UC3845TD

更新时间： 2024-11-22 22:59:31

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

阅读下载

中文翻译

获取价格

技术参数
数据手册

如果您发现信息不准确，欢迎纠错

UC3845TD 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	SO-8
针数：	8	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.64	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
最小输入电压：	12 V	标称输入电压：	15 V
JESD-30 代码：	R-PDSO-G8	长度：	4.9 mm
功能数量：	1	端子数量：	8
最大输出电流：	1 A	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	认证状态：	Not Qualified
座面最大高度：	1.75 mm	表面贴装：	YES
切换器配置：	SINGLE	最大切换频率：	500 kHz
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	宽度：	3.9 mm
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

下载PDF

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

与UC3845TD相关文章

解析光耦仿真器：升级光耦合器技术的必要性
2024-11-18

35
英伟达新一代Blackwell GPU过热问题致交付延迟
2024-11-18

26
国产厂商思特威CMOS图像传感器芯片单月出货超1亿颗，技术创新引领行业发展
2024-11-14

54
台积电5nm和3nm产能利用率达100%，半导体行业景气度持续攀升
2024-11-14

52

产品中心

服务支持

精选活动

关于我们

帮助中心

UC3845TD

UC3845TD 技术参数

UC3845TD 数据手册

与UC3845TD相关器件

与UC3845TD相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

UC3845TD

UC3845TD 技术参数

UC3845TD 数据手册

与UC3845TD相关器件

与UC3845TD相关文章

您还可以找

您在本页遇到什么问题？