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输入9-80V，非隔离输出28V,6A。最好是buck-boost芯片，因为体积受限制，只能用一个电感
HI
按照你的条件，采用buck-boost 是乎找不到合适的芯片：
http://www.ti.com.cn/lsds/ti_zh/power-management/buck-boost-or-inverting-controller-external-switch-products.page#p1129=Buck/Boost
