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lp8860电路电感啸叫发热问题

用MSP430F5510IRGC单片机控制lp8660芯片点亮屏幕,点亮的过程中,当亮度达到70%的时候电路中的电感开始啸叫亮度越大声音越大并且电感的表面温度会慢慢的升温,略微烫手。是什么原因呢,能有什么法子解决问题吗?我选择的模式是2 LED strings (1+2, 3+4) with 180° phase shift. Tied strings with same phase。brightness register mode 。电感值是10uH