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JSMSEMI TL494
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- JSMSEMI TL494
- Type
- JSMSEMI
- Minimum package
- 2500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- JSMSEMI
- Electronic Component
- TL494
- Electronic Component
- 1
- Package
- SOP-16
- Electronic Component
- DC-DC Power Supply IC
- Electronic Component
- 0.3g
- Electronic Component
- 1
- Features
- Built-in LDORegulator
- Electronic Component
- BM0230664942
- Operating Temperature
- 0℃~+70℃
- Switching Frequency
- 1kHz~300kHz
- Output Current
- 250mA
- Static Current(Iq)
- 6mA
- Electronic Component
- Electronic Component
- Electronic Component
- 2500
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
TL494 产品概述
一、概述
TL494 是一款用于开关电源和 DC-DC 变换器的 PWM 控制芯片。由 JSMSEMI(杰盛微) 推出的该器件采用 SOP-16 封装，适用于中小功率电源设计。器件支持外部振荡器调整，开关频率可在 1kHz 到 300kHz 范围内工作，器件输出驱动能力可达 250mA，工作温度范围 0℃～+70℃，适合工业级和消费类电源应用。
二、主要特性
- 可调振荡器：通过外部 RT、CT 元件设定频率，覆盖 1kHz～300kHz。
- PWM 控制：内部误差放大器和振荡器实现占空比调节与限幅控制。
- 输出驱动：芯片内置开集电极/开集电极式输出，综合驱动能力标称 250mA（驱动外部功率器件或小功率负载）。
- 保护与控制：支持软启动、死区时间/占空比限制及反馈调节，便于系统稳定与过载保护设计。
- 封装与温度：SOP-16 小封装，工作温度 0～70℃，适配常见 PCB 工艺。
三、典型应用场景
- 逆变器与开关稳压电源（SMPS）
- 隔离/非隔离 DC-DC 转换模块
- 电池充电器与电源管理模块
- 工业控制电源与通信设备供电
四、引脚与功能要点
关键引脚包括参考电压输出（Vref）、振荡器定时脚（RT/CT）、误差放大器输入/输出、PWM 控制与输出驱动端。Vref 可为外围电路提供稳定参考（典型 5V），RT/CT 决定振荡频率，误差放大器用于电压/电流环路的闭环调整，输出端驱动外部开关器件或直接供小电流负载。
五、设计注意事项
- 频率选择：低频利于降低开关损耗和 EMI，但需增大磁性元件体积；高频可缩小滤波元件但增大开关损耗。
- 输出驱动：器件标称 250mA 输出能力，若负载电流或开关晶体管基极/栅极驱动电流超出此值，应外接驱动器或功率晶体管。
- 稳定性与补偿：合理设计误差放大器的补偿网络，避免环路振荡。
- 布局与退耦：靠近 VCC 与 GND 放置退耦电容，输出与开关回路走线短且分离，减少噪声耦合。
- 热管理：SOP-16 在高温或大功率工况下需注意 PCB 导热与散热设计。
六、可靠性与选型建议
在 0℃～+70℃ 工作范围内，器件适合多数商业与轻工业用途；若用于严苛环境（高温或航天级），需选用工业级或温度范围更广的备选型号。选型时关注最大开关频率、参考电压精度、输出驱动能力及外围保护功能，结合系统功率需求决定是否需外加驱动芯片或功率开关器件。
总结：JSMSEMI 的 TL494 在中低功率开关电源设计中提供了灵活的 PWM 控制方案，频率可调、功能完整且封装紧凑，是常见的 DC-DC 控制器选择。
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