UC3842A

更新时间： 2024-11-27 22:41:51

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	403K
描述
HIGH PERFORMANCE CURRENT MODE CONTROLLERS

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中文翻译

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数据手册
替代型号

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UC3842A 数据手册

Order this document by UC3842A/D

HIGH PERFORMANCE

CURRENT MODE

CONTROLLERS

The UC3842A, UC3843A series of high performance fixed frequency

current mode controllers 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 a trimmed

oscillator for precise duty cycle control, 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,

programmable output deadtime, and a latch for single pulse metering.

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.

N SUFFIX

PLASTIC PACKAGE

CASE 626

D SUFFIX

PLASTIC PACKAGE

CASE 751A

The UCX842A has UYLO thresholds of 16 V (on) and 10 V (off), ideally

suited for off–line converters. The UCX843A is tailored for lower voltage

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

(SO–14)

• Trimmed Oscillator Discharge Current for Precise Duty Cycle Control

• Current Mode Operation to 500 kHz

PIN CONNECTIONS

• Automatic Feed Forward Compensation

Compensation

Voltage Feedback

Current Sense

ref

• Latching PWM for Cycle–By–Cycle Current Limiting

• Internally Trimmed Reference with Undervoltage Lockout

• High Current Totem Pole Output

• Undervoltage Lockout with Hysteresis

• Low Startup and Operating Current

Output

Gnd

(Top View)

• Direct Interface with Motorola SENSEFET Products

Compensation

ref

Voltage Feedback

Current Sense

Output

Gnd

Simplified Block Diagram

Power Ground

7(12)

(Top View)

ref

5.0V

Reference

Undervoltage

Lockout

ORDERING INFORMATION

Operating

8(14)

ref

Undervoltage

Lockout

Temperature Range

Device

Package

SO–14

Plastic

SO–14

Plastic

7(11)

UC3842AD

UC3843AD

UC3842AN

UC3843AN

UC2842AD

UC2843AD

UC2842AN

UC2843AN

Output

Oscillator

6(10)

4(7)

Latching

PWM

= 0° to +70°C

Power

Ground

5(8)

Voltage

Feedback

Input

–

2(3)

Error

Amplifier

Current

Sense

Input

Output

Compensation

1(1)

3(5)

= – 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

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UC3842A 替代型号

型号	品牌	替代类型	描述	数据表
UC3842A	UTC	功能相似	CURRENT MODE PWM CONTROL CIRCUITS

与UC3842A相关器件

型号	品牌	获取价格	描述	数据表
UC3842A UC3843A	UTC	获取价格	PWM Controllers with Low Start-Up Current
UC3842A/D	MOTOROLA	获取价格	High Performance Current Mode Controller
UC3842A_05	UTC	获取价格	CURRENT MODE PWM CONTROL CIRCUITS
UC3842A_05	ONSEMI	获取价格	High Performance Current Mode Controllers
UC3842A_07	ONSEMI	获取价格	High Performance Current Mode Controllers
UC3842A_11	UTC	获取价格	CURRENT MODE PWM CONTROL CIRCUITS
UC3842A_12	UTC	获取价格	CURRENT MODE PWM CONTROL CIRCUITS
UC3842A_17	UTC	获取价格	CURRENT MODE PWM CONTROL CIRCUITS
UC3842A-BW	FCI	获取价格	Current Mode PWM Controller Low Start-Up and Operating Current
UC3842ACD	ETC	获取价格	Analog IC

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