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CRMICRO PT4115BE89E
Configuration
1 options
Configuration
24+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- CRMICRO PT4115BE89E
- Type
- CRMICRO
- Minimum package
- 4000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- CRMICRO
- Electronic Component
- PT4115BE89E
- Electronic Component
- 1
- Package
- SOT-89-5
- Type
- DC-DC
- Electronic Component
- LEDDriver
- Electronic Component
- PWM; Analog
- Electronic Component
- 0.158g
- Electronic Component
- 1
- Channel Count
- 1
- Features
- LED; (OTP)
- Electronic Component
- BM0227676257
- Operating Temperature
- 40℃~+85℃
- Switching Frequency
- 1MHz
- Electronic Component
- 3%
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
PT4115BE89E 产品概述
一、概述
PT4115BE89E 是华润微（CRMICRO）面向中小功率白光 LED 驱动的降压型 DC-DC 恒流芯片。器件集成了内部开关管，输入电压范围宽（6V～40V），最大输出电流可达 1.2A，恒流精度 3%，开关频率约 1MHz，支持 PWM 与模拟双路调光，并具备过温保护（OTP）。工作温度范围为 -40℃ 到 +85℃，封装为 SOT-89-5，适合体积受限但需较高效率和良好调光性能的照明应用。
二、主要特性
- 降压拓扑，输出恒流型 LED 驱动。
- 输入电压：6V～40V，适配宽范围电源。
- 输出电流：最大 1.2A，恒流精度 ±3%。
- 内置开关管，简化外部器件选型与 PCB 布局。
- 开关频率约 1MHz，利于使用小体积电感与滤波元件。
- 支持 PWM 与模拟调光，调光平滑、响应快。
- 过温保护（OTP）提高系统可靠性。
- 封装：SOT-89-5，便于小型化设计。
三、典型应用场景
- 室内轨道灯、筒灯、射灯等中小功率 LED 照明灯具。
- 工业与商业照明模块。
- 车用辅助灯或车内照明（需按整车规范进行系统级验证）。
- 可调光的灯具与灯条驱动电源。
四、设计要点与建议
- 开关频率为 1MHz，建议选择低 DCR、饱和电流余量 ≥20% 的电感，以降低损耗与温升。
- 输入/输出电容采用低 ESR 类型（如 MLCC 或低 ESR 电解），布置靠近芯片引脚以减小环路电感。
- 开关回路走线尽量短且铜厚，最小化 EMI 并提升效率。
- 调光接口支持 PWM 与模拟两种方式，PWM 调光时注意占空比频率与滤波，避免可见闪烁。
- 为保证恒流精度与温漂性能，电流采样与限流器件应布局靠近芯片，使用合适功率的电流取样电阻，并考虑其温度系数。
- SOT-89-5 封装热阻相对较大，大功率工作时需在 PCB 上做大面积散热铜箔或热过孔。
五、封装与散热建议
SOT-89-5 体积小、成本低，但热容有限。若在高输入电压与高输出电流工况（如 1.2A）长期工作，应：
- 在芯片热面下方与周围放置较大面积的铜箔做散热层；
- 必要时采用多层板与过孔将热量传导到内层或底层散热平面；
- 将环境温升及器件温度控制在 OTP 触发阈值以下，确保可靠性。
六、保护与可靠性考量
器件内置过温保护，但系统级应当增加输入浪涌抑制（TVS）、防反接、以及合适的熔断/限流保护，以应对瞬态冲击与异常工作状态。此外，长期稳定性还需关注关键外设（如电感、电解电容）的寿命与温漂对恒流精度的影响。
七、总结
PT4115BE89E 是一款适合中小功率 LED 照明应用的高集成度恒流降压转换器，凭借宽输入范围、1.2A 输出能力、1MHz 高开关频率与双路调光支持，能在体积受限的灯具中实现可靠且平滑的调光控制。设计时应重视开关回路布局与散热处理，并在系统级加入必要的保护措施，以发挥器件最佳性能并保证长期可靠性。
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