Datasheet > UC1842N

UC1842N

更新时间： 2024-11-03 23:38:51

品牌	Logo	应用领域
其他 - ETC		光电二极管控制器
页数	文件大小	规格书
8页	579K
描述
SMPS 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

UC1842N 数据手册

application

INFO

UC1842/3/4/5

UC2842/3/4/5

UC3842/3/4/5

available

Current Mode PWM Controller

FEATURES

DESCRIPTION

•

Optimized For Off-line And DC

To DC Converters

The UC1842/3/4/5 family of control ICs provides the necessary features to

implement off-line or DC to DC fixed frequency current mode control schemes

with a minimal external parts count. Internally implemented circuits include

under-voltage lockout featuring start up current less than 1mA, a precision

reference trimmed for accuracy at the error amp input, logic to insure latched

operation, a PWM comparator which also provides current limit control, and a

totem pole output stage designed to source or sink high peak current. The

output stage, suitable for driving N Channel MOSFETs, is low in the off state.

•

Low Start Up Current (<1mA)

Automatic Feed Forward

Compensation

•

Pulse-by-pulse Current Limiting

Enhanced Load Response

Characteristics

Differences between members of this family are the under-voltage lockout

thresholds and maximum duty cycle ranges. The UC1842 and UC1844 have

UVLO thresholds of 16V (on) and 10V (off), ideally suited to off-line

applications. The corresponding thresholds for the UC1843 and UC1845 are

8.4V and 7.6V. The UC1842 and UC1843 can operate to duty cycles

approaching 100%. A range of zero to 50% is obtained by the UC1844 and

UC1845 by the addition of an internal toggle flip flop which blanks the output

off every other clock cycle.

•

Under-voltage Lockout With

Hysteresis

•

Double Pulse Suppression

High Current Totem Pole

Output

•

Internally Trimmed Bandgap

Reference

•

500khz Operation

Low RO Error Amp

BLOCK DIAGRAM

A/B

Note 1:

Note 2:

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

Toggle flip flop used only in 1844 and 1845.

SLUS223A - APRIL 1997 - REVISED MAY 2002

12 3 4 5 6 7 8

中文翻译

下载PDF

与UC1842N相关器件

型号	品牌	获取价格	描述	数据表
UC1842Q	ETC	获取价格	SMPS Controller
UC1842-SP	TI	获取价格	航天级 QMLV、30V 输入、1A 单路输出 500kHz PWM 控制器、100% 占
UC1842W	TI	获取价格	Current Mode PWM Controller
UC1843	TI	获取价格	Current Mode PWM Controller
UC1843A	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC1843A	TI	获取价格	Current Mode PWM Controller
UC1843A	MICROCHIP	获取价格	Control ICs provides all the necessary features to implement off-line fixed-frequency, cur
UC1843AAY	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC1843A-DIE	TI	获取价格	CURRENT-MODE PWM CONTROLLER
UC1843A-DIE_15	TI	获取价格	CURRENT-MODE PWM CONTROLLER