Datasheet > UC3843DX

UC3843DX

更新时间： 2025-09-19 19:03:23

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UC3843DX 数据手册

www.fairchildsemi.com

UC3842/UC3843/UC3844/UC3845

SMPS Controller

Features

Description

• Low Start up Current

• Maximum Duty Clamp

• UVLO With Hysteresis

• Operating Frequency up to 500KHz

The UC3842/UC3843/UC3844/UC3845 are fixed

frequencycurrent-mode PWM controller. They are specially

designed for Off-Line and DC to DC converter applications

with minimum 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 totempole output for driving a Power MOSFET. The

UC3842 and UC3844 have UVLO thresholds of 16V (on)

and 10V (off). The UC3843 and UC3845 are 8.5V(on) and

7.9V (off). The UC3842 and UC3843 can operate within

100% duty cycle. The UC3844 and UC3845 can operate

with 50% duty cycle.

8-SOP

8-DIP

14-SOP

Internal Block Diagram

* NORMALLY 8DIP/8SOP PIN NO.

* ( ) IS 14SOP PINNO.

* TOGGLE FLIP FLOP USED ONLY IN UC3844, UC3845

Rev. 1.0.1

12 3 4 5 6 7...12

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型号	品牌	获取价格	描述	数据表
UC3843J	TI	获取价格	Current Mode PWM Controller
UC3843J	STMICROELECTRONICS	获取价格	1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, CDIP8, MINI, CERAMIC, DIP-8
UC3843M/TR	HGSEMI	获取价格
UC3843N	TI	获取价格	Current Mode PWM Controller
UC3843N	STMICROELECTRONICS	获取价格	CURRENTMODE PWM CONTROLLER
UC3843N	FAIRCHILD	获取价格	SMPS Controller
UC3843N	ONSEMI	获取价格	元器件封装:8-DIP;
UC3843N	ONSEMI	获取价格
UC3843NG4	TI	获取价格	CURRENT MODE PWM CONTROLLER
UC3843P	TI	获取价格	Current Mode PWM Controller