
前言:大功率 LED、功率芯片越做越小、功率越做越高,但 70% 电能都会变成热量散不出去,温度一飙升,会出现基板碳化、器件直接报废等问题。传统 FR4 PCB 便宜好加工,可导热差根本扛不住大功率场景;纯陶瓷基板散热强,却又脆、加工贵、工艺较为复杂,内嵌 DPC 陶瓷电路板的复合 PCB 基板,兼顾低成本、易布线、超强散热三大优势,完美解决大功率 LED 封装散热难题。

(a)内嵌基板整体截面图;(b)DPC基板通孔截面图;(c)内嵌基板粘接层截面图。
具体工艺流程如下:

△内嵌 DPC 的 PCB 基板制备工艺及其封装流程
DPC 基板制备:激光打孔、溅射镀膜(沉积种子层)、贴干膜、曝光、显影、电镀增厚等,激光切割后得到单片 DPC 基板(含线路层)。
PCB 基板:层压、贴干膜、曝光、显影和刻蚀等工艺制备,表面线路可进行喷锡或沉金处理。
步骤①:在 PCB 基 板 上 进 行 开 窗 处理,开窗区域尺寸与 DPC 基板相当。
步骤②:在 PCB 基板开窗区域内沿涂覆胶粘剂,将 DPC基板内嵌入开窗区域,在 150 ℃下保温 60 min 使胶粘剂固化,随后对胶层边缘进行研磨处理使表面平整。

(a)内嵌基板实物图;(b)封装 LED 芯片后内嵌基板局部放大图
步骤③:在基板背面沉积金属层,实现 PCB与 DPC 基板间电互连,得到完整的内嵌基板。
来源:《内嵌陶瓷电路板的 PCB 基板制备及其 LED 封装性能》,王哲等
推荐活动一:【展会同期论坛】陶瓷基板暨功率半导体产业论坛(8月26日·深圳)
(议题更新至7月11日)
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Topic To Be Confirmed |
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深圳禾思众成科技有限公司 副总经理 刘伟生 |


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