Datasheet > UC3843W

UC3843W

更新时间： 2024-01-18 14:20:52

品牌	Logo	应用领域
其他 - ETC		控制器
页数	文件大小	规格书
8页	579K
描述
SMPS 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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UC3843W 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：	5.64
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

UC3843W 数据手册

application

INFO

UC1842/3/4/5

UC2842/3/4/5

UC3842/3/4/5

available

Current Mode PWM Controller

FEATURES

DESCRIPTION

•

Optimized For Off-line And DC

To DC Converters

The UC1842/3/4/5 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 implemented circuits include

under-voltage lockout featuring start up current less than 1mA, a precision

reference trimmed for accuracy at the error amp input, logic to insure latched

operation, a PWM comparator which also provides current limit control, 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 Current (<1mA)

Automatic Feed Forward

Compensation

•

Pulse-by-pulse Current Limiting

Enhanced Load Response

Characteristics

Differences between members of this family are the under-voltage lockout

thresholds and maximum duty cycle ranges. The UC1842 and UC1844 have

UVLO thresholds of 16V (on) and 10V (off), ideally suited to off-line

applications. The corresponding thresholds for the UC1843 and UC1845 are

8.4V and 7.6V. The UC1842 and UC1843 can operate to duty cycles

approaching 100%. A range of zero to 50% is obtained by the UC1844 and

UC1845 by the addition of an internal toggle flip flop which blanks the output

off every other clock cycle.

•

Under-voltage Lockout With

Hysteresis

•

Double Pulse Suppression

High Current Totem Pole

Output

•

Internally Trimmed Bandgap

Reference

•

500khz Operation

Low RO Error Amp

BLOCK DIAGRAM

A/B

Note 1:

Note 2:

A = DIL-8 Pin Number. B = SO-14 and CFP-14 Pin Number.

Toggle flip flop used only in 1844 and 1845.

SLUS223A - APRIL 1997 - REVISED MAY 2002

12 3 4 5 6 7 8

中文翻译

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与UC3843W相关器件

型号	品牌	获取价格	描述	数据表
UC3843Y	TI	获取价格	1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, UUC8
UC3844	FAIRCHILD	获取价格	SMPS Controller
UC3844	TI	获取价格	CURRENT MODE PWM CONTROLLER
UC3844	UTC	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
UC3844	STMICROELECTRONICS	获取价格	CURRENTMODE PWM CONTROLLER
UC3844	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844	MOTOROLA	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3844 UC3845	UTC	获取价格	PWM Controllers with Low Start-Up Current
UC3844/D	ETC	获取价格	High Performance Current Mode Controller
UC3844_06	ONSEMI	获取价格	High Performance Current Mode Controllers

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