UC3845B集成电路（IC）的ACDC转换器离线开关规格书PDF中文资料

厂商型号	UC3845B
参数属性	UC3845B 封装/外壳为8-SOIC（0.154"，3.90mm 宽）；包装为卷带（TR）；类别为集成电路（IC）的ACDC转换器离线开关；产品描述：SOP-8 AC-DC CONTROLLERS \u0026 REGULA
功能描述	Low Start-Up and Operating Current
封装外壳	8-SOIC（0.154"，3.90mm 宽）
文件大小	874.34 Kbytes
页面数量	7 页
生产厂商	UMW
中文名称	友台半导体
网址	网址
数据手册	下载地址一下载地址二到原厂下载
更新时间	2026-2-9 23:00:00
人工找货	UC3845B价格和库存，欢迎联系客服免费人工找货

描述 Description

The 3842/43/44/45 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

totempole output ideally suited for driving a power MOSFET. Protection circuitry includes built undervoltage lockout and current

limiting. The 3842 and 3844 have UVLO thresholds of 16 V (on) and 10 V (off). The corresponding thresholds for the 3843/

45 are 8.4V (on) and 7.6V (off). The 3842) and 3843 can operate within 100 duty cycle. The 3844 and 3845 can operate within 50 duty

cycle.

The 384X has Start-Up Current 0.5mA (typ).

特性 Features

Low Start-Up and Operating Current

High Current Totem Pole Output

Undervoltage Lockout With Hysteresis

Operating Frequency Up To 500KHz