The UC3842B, UC3843B series are high performance fixed frequency current mode controllers. They are specifically designed for Off−Line and DC−DC converter applications offering the designer. a cost−effective solution with minimal external components.

TI 的 UC3842 是一款 具有 16V/10V UVLO 和 100% 占空比、温度范围为 0°C 至 70°C 的单端 500KHz 电流模式 PWM 控制器。 查找参数、订购和质量信息.

UC3842B Product details DESCRIPTION The UC384xB family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count.

下载UC3842B中文资料、引脚图、Datasheet数据手册，有AC-DC控制器和稳压器详细引脚图及功能的应用电路图电压和使用方法及教程。

The UC3842B, UC3843B series are high performance fixed frequency current mode controllers. They are specifically designed for Off-Line and dc-to-dc converter applications offering the designer a cost-effective solution with minimal external components.

cycle ranges. The UC3842B and UC3844B have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresh-olds for the UC3843B and UC3845B are 8.5 V and 7.9 V. The UC3842B and UC3843B can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC3844B and UC3845B by

Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, a precision reference 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 sta...

2022年5月13日 · UC3842 是AC-DC反激式变压器中常用的电源管理芯片，其具有较低的启动电流（<1mA），并且可以在高达500KHz频率下工作，在输出端输出可脉宽调制的PWM波来驱动NMOSFET，并且在MOS管关断时具有较低的功耗。 图1. UC3842管脚分布图. 1.COMP (Compensation)：误差放大器补偿引脚。 内接误差放大器E/A的输出端，可通过连接外部补偿 组件 (如阻容网络)来调整误差放大器的输出。 误差放大器内部限流，可以通过将COMP引脚接GND …

Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, a precision reference …

2021年11月7日 · UC3842是一种高性能固定频率电流型控制器，包含误差放大器、PWM比较器、PWM锁存器、振荡器、内部基准电源和欠压锁定等单元，其结构图如图1所示。 各管脚功能简介如下： 1脚COMP是内部误差放大器的输出端，通常此脚与2脚之间接有反馈网络，以确定误差放大器的增益和频响。 2脚FEED BACK是反馈电压输入端，此脚与内部误差放大器同向输入端的基准电压（一般为+2.5V）进行比较，产生控制电压，控制脉冲的宽度。 3脚ISENSE是电流传感端。 …