UC2845A

更新时间： 2024-11-22 21:56:07

品牌	Logo	应用领域
德州仪器 - TI		稳压器开关式稳压器或控制器电源电路开关式控制器
页数	文件大小	规格书
7页	519K
描述
Current Mode PWM Controller

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中文翻译

获取价格

技术参数
数据手册
替代型号

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UC2845A 技术参数

生命周期：	Obsolete	Reach Compliance Code：	unknown
风险等级：	5.7	Is Samacsys：	N
Base Number Matches：	1

UC2845A 数据手册

UC1842A/3A/4A/5A

UC2842A/3A/4A/5A

UC3842A/3A/4A/5A

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 compat-

ible 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.

9/94

12 3 4 5 6 7

中文翻译

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UC2845A 替代型号

型号	品牌	替代类型	描述	数据表
UC3845A	TI	功能相似	Current Mode PWM Controller
UC1845A	TI	功能相似	CURRENT-MODE PWM CONTROLLER

与UC2845A相关器件

型号	品牌	获取价格	描述	数据表
UC2845AAY	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC2845AD	TI	获取价格	Current-Mode SMPS Controller
UC2845AD	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC2845AD1	STMICROELECTRONICS	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC2845AD8	TI	获取价格	Current Mode PWM Controller
UC2845AD8G4	TI	获取价格	Current Mode PWM Controller
UC2845AD8TR	TI	获取价格	Current Mode PWM Controller
UC2845AD8TRG4	TI	获取价格	Current Mode PWM Controller
UC2845ADG4	TI	获取价格	Current Mode PWM Controller
UC2845ADM	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER