UC1844

更新时间： 2024-11-22 22:41:51

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
8页	436K
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

UC1844 数据手册

UC1842/3/4/5

UC2842/3/4/5

UC3842/3/4/5

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 im-

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

with a minimal external parts count. Internally implemented circuits include un-

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

ence 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 out-

put 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 applica-

tions. 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

Note 1: A/B A = DIL-8 Pin Number. B = SO-14 Pin Number.

Note 2: Toggle flip flop used only in 1844 and 1845.

4/97

12 3 4 5 6 7 8

中文翻译

下载PDF

与UC1844相关器件

型号	品牌	获取价格	描述	数据表
UC1844 UC1845	UTC	获取价格	high performance current mode pwm controllers
UC1844A	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC1844A	TI	获取价格	CURRENT-MODE PWM CONTROLLER
UC1844AAY	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC1844A-EP	TI	获取价格	CURRENT-MODE PWM CONTROLLER
UC1844AJ	TI	获取价格	Current Mode PWM Controller
UC1844AJ/883B	ROCHESTER	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, CDIP8
UC1844AJ883B	TI	获取价格	Current Mode PWM Controller
UC1844AJQMLV	TI	获取价格	Current Mode PWM Controller
UC1844AL	ETC	获取价格