Datasheet > UC3845B

UC3845B

更新时间： 2024-11-24 15:18:59

品牌	Logo	应用领域
华冠 - HGSEMI		/
页数	文件大小	规格书
14页	883K
描述
电流型脉宽调制器

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数据手册

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UC3845B 数据手册

UC3842B/43B/44B/45B

CURRENT MODE PWM CONTROLLER

DESCRIPTION

The UC3842B/43B/44B/45B are fixed frequency current mode PWM

controller.

They are specially designed for OFF Line and DC to DC converter

applications with a minimal external components. Internally implemented

circuits include a trimmed oscillator for precise duty cycle control, a

temperature compensated reference, high gain error amplifier, current

sensing comparator, and a high current totem pole output ideally

suited for driving a power MOSFET. Protection circuitry includes built

under voltage lockout and current limiting.

DIP-8

The UC3842B, UC3844B have UVLO thresholds of 16 V (on) and 10 V (off).

The corresponding thresholds for the UC3843B, UC3845B are 8.4V (on)

and 7.6V (off).

SOP-8

The UC3842B, UC3843B can operate within 100% duty cycle.

The UC3844B, UC3845B can operate within 50% duty cycle.

The UC3842B/43B/44B/45B is characterized for operation from TA = -40°C

to 85°C.

FEATURES



Low Start-Up and Operating Current

High Current Totem Pole Output

Under voltage Lockout With Hysteresis

Operating Frequency Up To 500KHz

ORDERING INFORMATION

DEVICE

Package Type

MARKING

UC3842B

UC3843B

UC3844B

UC3845B

UC3842B

UC3843B

UC3844B

UC3845B

Packing

TUBE

REEL

Packing Qty

UC3842BN

DIP-8

SOP-8

2000pcs/box

2500pcs/reel

UC3843BN

UC3844BN

UC3845BN

UC3842BM/TR

UC3843BM/TR

UC3844BM/TR

UC3845BM/TR

http://www.hgsemi.com.cn

2018 AUG

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