UC3842

更新时间： 2024-11-03 22:39:59

品牌	Logo	应用领域
恩智浦 - NXP		控制器
页数	文件大小	规格书
8页	75K
描述
Current-mode PWM controller

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

UC3842 数据手册

Philips Semiconductors Linear Products

Product specification

Current-mode PWM controller

UC3842

DESCRIPTION

PIN CONFIGURATIONS

The UC3842 is available in an 8-Pin mini-DIP the necessary

features to implement off-line, fixed-frequency current-mode control

schemes with a minimal external parts count. This technique results

in improved line regulation, enhanced load response characteristics,

and a simpler, easier to design control loop. Topological advantages

include inherent pulse-by-pulse current limiting.

N Package

COMP

REF

OUTPUT

GROUND

SENSE

Protection circuitry includes built-in undervoltage lock-out and

current limiting. Other features include fully-latched operation, a 1%

trimmed bandgap reference, and start-up current less than 1mA.

TOP VIEW

These devices feature a totem-pole output designed to source and

sink high peak current from a capacitive load, such as the gate of a

power MOSFET. Consistent with N-channel power devices, the

output is low in the OFF-state.

D Package

COMP

REF

FEATURES

• Low start-up current (≤1mA)

• Automatic feed-forward compensation

• Pulse-by-pulse current limiting

OUTPUT

SENSE

GROUND

POWER GROUND

• Enhanced load response characteristics

• Undervoltage lock-out with hysteresis

• Double pulse suppression

TOP VIEW

• High current totem-pole output

APPLICATIONS

• Internally-trimmed bandgap reference

• 400kHz operation, guaranteed min

• Off-line switched mode power supplies

• DC-to-DC converters UC3842

BLOCK DIAGRAM

7(11)

(12)7

UVLO

34V

REF

8(14)

5.0V

50mA

REF

(9)5

(7)4

S/R

GND

16V

2.5V

INTERNAL

BIAS

OSC

6(10)

OUTPUT

ERROR

AMP

–

PWM

LATCH

(3)2

(1)1

(5)3

CURRENT

SENSE

COMP

COMPARATOR

CURRENT

SENSE

5(8)

NOTE:

Pin numbers in parentheses refer to the D package.

1100

August 31, 1994

853-0614 13721

12 3 4 5 6 7 8

中文翻译

下载PDF

与UC3842相关器件

型号	品牌	获取价格	描述	数据表
UC3842A	FCI	获取价格	High Performance Current Mode Controller
UC3842A	UTC	获取价格	CURRENT MODE PWM CONTROL CIRCUITS
UC3842A	MOTOROLA	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3842A	ONSEMI	获取价格	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3842A	STMICROELECTRONICS	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3842A	FAIRCHILD	获取价格	SMPS Controller
UC3842A	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC3842A	TI	获取价格	Current Mode PWM Controller
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