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6657用的9222+7242这套电源方案,正常工作电压只在6.8V到8.1V之间

Other Parts Discussed in Thread: UCD7242

自己做的6657的板子,电源用的9222+7242这套方案,参考官板画的,目前6657只在6.8V到8.1V之间正常工作,

目前发现板子画的有几处问题:

    1,9222那里反馈的EAP/EAN两组信号没有画成差分线,也没放在dsp附近;
    2,7242输出那里电容大小和官板不一样,

目前希望电源能在12V或5V上工作,但5V和12V,dsp均不能启动,请问可能是哪里的问题呢?