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OPA549大电流工作,8A峰值连续工作散热怎么解决?

Other Parts Discussed in Thread: OPA549

近期用OPA549制作了一个功放8A峰值连续工作数分钟后芯片过热保护就开启了。换用过大很多的散热片也是如此,才工作这么点时间也能叫8A峰值连续?

还是其他问题引起的?大概算了一下芯片本生的功耗,8A工作输出幅度典型值为(V+)-4.3,(V-)+3.9,功耗P=(4.3+3.9)*(8/2/1.414)=23.19瓦,这么大的功耗散热片得取多大?使用的散热片尺寸为10*7*4的散热面积也很大