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XBLW UC3843BDTR
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- XBLW UC3843BDTR(XBLW)
- Type
- XBLW
- Minimum package
- 2500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- XBLW
- Electronic Component
- UC3843BDTR(XBLW)
- Electronic Component
- 1
- Package
- SOP-8
- Electronic Component
- DC-DC Power Supply IC
- Electronic Component
- 0.193g
- Electronic Component
- 1
- Electronic Component
- BM0265583729
- Operating Temperature
- 0℃~+70℃@(TA)
- Switching Frequency
- 52kHz
- Output Channel Count
- 1
- Static Current(Iq)
- 12mA
- Electronic Component
- Electronic Component
- Electronic Component
- 2500
- Switch
- Electronic Component
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
UC3843BDTR(XBLW) 电流模式PWM控制器产品概述
一、产品定位与核心功能
UC3843BDTR是芯伯乐（XBLW）推出的中小功率电流模式PWM控制器，专为开关电源设计，可驱动外置功率开关管（MOSFET/BJT），覆盖消费电子、工业辅助电源等场景。其核心价值在于通过电流模式控制实现快速负载响应，同时内置多重保护机制，平衡性能与可靠性。
二、关键电气参数解析
结合芯伯乐官方规格与行业通用特性，核心参数如下：
参数项 典型值/范围 说明 开关频率 52kHz（±5%精度） 固定频率，适配中小功率开关管开关损耗 工作温度范围 0℃~+70℃（环境温度TA） 满足消费类及一般工业场景需求 输入电压范围 10V~30V（直流） 适配前级整流滤波后的宽电压输入 输出驱动能力 200mA（拉/灌电流） 直接驱动中小功率外置MOSFET（如AO3400） 参考电压（8脚） 5V±1% 高精度基准，为反馈回路提供稳定偏置 欠压锁定（UVLO） 开启16V/关闭10V（典型） 低电压下关断输出，避免控制器不稳定 过流保护阈值 1V（电流检测端） 逐周期限流，抑制过载冲击三、SOP-8封装与引脚定义
采用标准SOP-8贴片封装，引脚功能清晰，便于电路设计：
引脚编号 名称 功能说明 1 COMP 误差放大器输出/补偿端，外接RC稳定反馈回路 2 CURRENT 电流检测输入，外接0.1Ω~1Ω采样电阻 3 VOLTAGE 电压反馈输入，接收输出电压分压信号 4 OSCILLATOR 振荡端，外接Rosc（5kΩ10kΩ）+Cosc（100pF1μF）设置频率 5 GND 电源地，需与功率地单点连接减少干扰 6 OUTPUT PWM输出端，图腾柱结构驱动外置开关管 7 VCC 电源输入，外接10μF电解+0.1μF陶瓷滤波 8 VREF 5V高精度参考电压，可为反馈电路供电四、典型应用场景
UC3843BDTR的电流模式架构使其适配以下场景：
- 离线式适配器：手机充电器、笔记本电源（5W~60W）；
- DC-DC变换器：12V→5V、24V→12V降压电路；
- LED驱动：中小功率LED照明（台灯、面板灯）恒流驱动；
- 工业辅助电源：PLC、传感器的低压供电模块。
外置开关管设计允许用户根据功率需求灵活选择器件（如IRF540、AO3401），降低成本。
五、性能优势与设计要点
5.1 电流模式控制优势
- 逐周期限流：电流检测端超过1V阈值时立即关断输出，避免开关管过载；
- 快速负载响应：无需等待电压环路稳定，负载突变时电压波动<5%（典型）；
- 简化补偿设计：电流模式的相位裕量更宽，反馈回路补偿更简单。
5.2 关键设计注意事项
- 振荡元件计算：频率公式 f(kHz)=1.8/(Rosc(kΩ)×Cosc(μF))，52kHz对应Rosc=10kΩ、Cosc=330pF；
- 电流检测电阻：Rcs=Vlimit/Imax（如Imax=0.5A时，Rcs=2Ω，需注意功率损耗 P=I²R）；
- 软启动电容：外接0.1μF1μF电容，实现10ms100ms软启动，抑制开机浪涌。
六、总结
UC3843BDTR(XBLW)继承了UC3843系列的成熟架构，针对中小功率应用优化了52kHz开关频率，配合SOP-8紧凑封装，适合批量贴片生产。其内置的UVLO、过流保护与软启动功能，兼顾了可靠性与设计灵活性，是消费电子、工业电源领域的高性价比选择。
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