UC3842B

更新时间： 2024-11-03 22:41:51

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		开关光电二极管控制器
页数	文件大小	规格书
16页	405K
描述
HIGH PERFORMANCE CURRENT MODE CONTROLLERS

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中文翻译

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UC3842B 数据手册

Order this document by UC3842B/D

HIGH PERFORMANCE

CURRENT MODE

CONTROLLERS

The UC3842B, UC3843B 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

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.

N SUFFIX

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 and surface mount

(SO–8) 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.

PLASTIC PACKAGE

CASE 626

D1 SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off), ideally

suited for off–line converters. The UCX843B is tailored for lower voltage

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

D SUFFIX

PLASTIC PACKAGE

CASE 751A

(SO–14)

• Trimmed Oscillator for Precise Frequency Control

• Oscillator Frequency Guaranteed at 250 kHz

• Current Mode Operation to 500 kHz

PIN CONNECTIONS

• Automatic Feed Forward Compensation

• 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

Compensation

Voltage Feedback

Current Sense

ref

Output

R /C

Gnd

(Top View)

Compensation

ref

Voltage Feedback

Current Sense

Output

Gnd

Simplified Block Diagram

R /C

Power Ground

7(12)

(Top View)

ref

5.0V

Reference

Undervoltage

Lockout

8(14)

ORDERING INFORMATION

Operating

ref

Undervoltage

Lockout

Device

Package

Temperature Range

7(11)

UC384XBD

UC384XBD1

UC384XBN

UC284XBD

UC284XBD1

UC284XBN

UC384XBVD

UC384XBVD1

UC384XBVN

SO–14

SO–8

Plastic

SO–14

SO–8

Output

= 0° to +70°C

Oscillator

6(10)

4(7)

Latching

PWM

Power

Ground

5(8)

Voltage

Feedback

Input

–

= – 25° to +85°C

= –40° to +105°C

Plastic

SO–14

SO–8

2(3)

Error

Amplifier

Current

Sense

Input

Output

Compensation

1(1)

3(5)

Plastic

Gnd

5(9)

X indicates either a 2 or 3 to define specific device part

numbers.

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...16

中文翻译

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与UC3842B相关器件

型号	品牌	获取价格	描述	数据表
UC3842B UC3843B	UTC	获取价格	PWM Controllers with Low Start-Up Current
UC3842B/D	ETC	获取价格	High Performance Current Mode Controller
UC3842B_07	ONSEMI	获取价格	High Performance Current Mode Controllers
UC3842B_08	UTC	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3842B_11	ONSEMI	获取价格	High Performance Current Mode Controllers
UC3842B_12	UTC	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3842BD	ONSEMI	获取价格	High Performance Current Mode Controllers
UC3842BD	MOTOROLA	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3842B-D08-T	UTC	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3842BD1	MOTOROLA	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS

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