UC3844

更新时间： 2024-11-23 07:05:27

品牌	Logo	应用领域
安森美 - ONSEMI		控制器
页数	文件大小	规格书
14页	380K
描述
HIGH PERFORMANCE CURRENT MODE CONTROLLERS

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

UC3844 数据手册

Order this document by UC3844/D

HIGH PERFORMANCE

CURRENT MODE

CONTROLLERS

The UC3844, UC3845 series are high performance fixed frequency

current mode controllers. They are specifically designed for Off–Line and

dc–to–dc converter applications offering the designer a cost effective

solution with minimal external components. These integrated circuits feature

an oscillator, a temperature compensated reference, high gain error

amplifier, current sensing comparator, and a high current totem pole output

ideally suited for driving a power MOSFET.

Also included are protective features consisting of input and reference

undervoltage lockouts each with hysteresis, cycle–by–cycle current limiting,

a latch for single pulse metering, and a flip–flop which blanks the output off

every other oscillator cycle, allowing output deadtimes to be programmed for

50% to 70%.

N SUFFIX

PLASTIC PACKAGE

CASE 626

D SUFFIX

These devices are available in an 8–pin dual–in–line plastic package as

well as the 14–pin plastic surface mount (SO–14). The SO–14 package has

separate power and ground pins for the totem pole output stage.

The UCX844 has UVLO thresholds of 16 V (on) and 10 V (off), ideally

suited for off–line converters. The UCX845 is tailored for lower voltage

applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).

PLASTIC PACKAGE

CASE 751A

(SO–14)

PIN CONNECTIONS

• Current Mode Operation to 500 kHz Output Switching Frequency

• Output Deadtime Adjustable from 50% to 70%

• Automatic Feed Forward Compensation

• Latching PWM for Cycle–By–Cycle Current Limiting

• Internally Trimmed Reference with Undervoltage Lockout

• High Current Totem Pole Output

• Input Undervoltage Lockout with Hysteresis

• Low Startup and Operating Current

• Direct Interface with Motorola SENSEFET Products

Compensation

Voltage Feedback

Current Sense

ref

Output

Gnd

(Top View)

Compensation

ref

Voltage Feedback

Current Sense

Output

Gnd

Simplified Block Diagram

Power Ground

7(12)

(Top View)

ref

8(14)

5.0V

Reference

Undervoltage

Lockout

ORDERING INFORMATION

Operating

ref

Undervoltage

Lockout

Temperature Range

Device

Package

SO–14

Plastic

SO–14

Plastic

7(11)

UC3844D

UC3845D

UC3844N

UC3845N

UC2844D

UC2845D

UC2844N

UC2845N

4(7)

Output

6(10)

Flip

Flop

Latching

PWM

Oscillator

= 0° to +70°C

Voltage

Feedback

PWR GND

5(8)

–

2(3)

Current

Sense

3(5)

Error

Amplifier

1(1)

Output

Comp.

= – 25° to +85°C

Gnd

5(9)

Pin numbers in parenthesis are for the D suffix SO–14 package.

Motorola, Inc. 1996

Rev 1

MOTOROLA ANALOG IC DEVICE DATA

12 3 4 5 6 7...14

中文翻译

下载PDF

与UC3844相关器件

型号	品牌	获取价格	描述	数据表
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
UC3844_11	UTC	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
UC3844_13	UTC	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
UC3844A	STMICROELECTRONICS	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3844A	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC3844A	TI	获取价格	Current Mode PWM Controller
UC3844A	FCI	获取价格	High Performance Current Mode Controller
UC3844A-BW	FCI	获取价格	Current Mode PWM Controller Low Start-Up and Operating Current

与UC3844相关文章

UC3844芯片引脚图及功能图解
2024-02-02

211
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

产品中心

服务支持

精选活动

关于我们

帮助中心

UC3844

UC3844 数据手册

与UC3844相关器件

与UC3844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

UC3844

UC3844 数据手册

与UC3844相关器件

与UC3844相关文章

您还可以找

您在本页遇到什么问题？