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OPA548散热问题

Other Parts Discussed in Thread: OPA548

目前用OPA548T做功率放大,放在一个封闭外壳内,片子贴壳体散热,发热非常严重,除了降低供电电压外,还有什么好的方法能降低发热量,或者有没有可替代的军工级片子?

  • 这款本身是一款高电流输出的运放产品,所以功耗比较大。

    OPA548内部含有thermal shutdown 电路,也就是说当结温超过160度的时候,自动将输出disable。

    另外,需要加散热片来提高散热,datasheet Page16中给出了散热片的规格, This indicates the need for a heatsink with a RθHA < 2.5°C/W, such as an Aavid Thermalloy 530002B02500G.