UC3843A

更新时间： 2024-11-03 22:41:51

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
11页	659K
描述
Current Mode PWM Controller

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中文翻译

获取价格

数据手册
替代型号

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UC3843A 数据手册

application

INFO

UC1842A/3A/4A/5A

UC2842A/3A/4A/5A

UC3842A/3A/4A/5A

available

Current Mode PWM Controller

FEATURES

DESCRIPTION

•

Optimized for Off-line and DC to DC

The UC1842A/3A/4A/5A family of control ICs is a pin for pin compati-

ble improved version of the UC3842/3/4/5 family. Providing the nec-

essary features to control current mode switched mode power

supplies, this family has the following improved features. Start up cur-

rent is guaranteed to be less than 0.5mA. Oscillator discharge is

trimmed to 8.3mA. During under voltage lockout, the output stage

can sink at least 10mA at less than 1.2V for VCC over 5V.

Converters

•

Low Start Up Current (<0.5mA)

Trimmed Oscillator Discharge Current

Automatic Feed Forward Compensation

Pulse-by-Pulse Current Limiting

Enhanced Load Response Characteristics

Under-Voltage Lockout With Hysteresis

Double Pulse Suppression

The difference between members of this family are shown in the table

below.

Maximum Duty

Part #

UVLO On

UVLO Off

Cycle

<100%

<50%

High Current Totem Pole Output

Internally Trimmed Bandgap Reference

500kHz Operation

UC1842A

UC1843A

UC1844A

UC1845A

16.0V

8.5V

10.0V

7.9V

16.0V

8.5V

10.0V

7.9V

<50%

Low RO Error Amp

BLOCK DIAGRAM

A/B

Note 1:

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

Note 2: Toggle flip flop used only in 1844A and 1845A.

SLUS224A - SEPTEMBER 1994 - REVISED APRIL 2002

12 3 4 5 6 7...11

中文翻译

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UC3843A 替代型号

型号	品牌	替代类型	描述	数据表
UC1843A	TI	功能相似	Current Mode PWM Controller
UC2843A	TI	功能相似	Current Mode PWM Controller

与UC3843A相关器件

型号	品牌	获取价格	描述	数据表
UC3843A_15	UTC	获取价格	CURRENT MODE PWM CONTROL CIRCUITS
UC3843A-BW	FCI	获取价格	Current Mode PWM Controller Low Start-Up and Operating Current
UC3843AD	FAIRCHILD	获取价格	SMPS Controller
UC3843AD	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC3843AD	MOTOROLA	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3843AD	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3843AD	TI	获取价格	Current Mode PWM Controller
UC3843AD_NL	FAIRCHILD	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO8, LEAD FREE, SOP-8
UC3843A-D08-T	UTC	获取价格	CURRENT MODE PWM CONTROL CIRCUITS
UC3843AD1	ONSEMI	获取价格	High Performance Current Mode Controllers