UC3845

更新时间： 2024-11-22 22:01:59

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UC3845 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
UC3845_15	UTC	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
UC3845A	TI	获取价格	Current Mode PWM Controller
UC3845A	FCI	获取价格	High Performance Current Mode Controller
UC3845A	STMICROELECTRONICS	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3845A	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC3845A-BW	FCI	获取价格	Current Mode PWM Controller Low Start-Up and Operating Current
UC3845ACD	FCI-CONNECTOR	获取价格	Switching Regulator/Controller
UC3845ACS	FCI-CONNECTOR	获取价格	Switching Regulator/Controller
UC3845AD	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC3845AD	TI	获取价格	Current Mode PWM Controller