http://www.onsemi.cn/PowerSolutions/product.do?id=MC33063A下面链接有详细的公式:http://www.onsemi.cn/pub_link/Collateral/MC34063A-D.PDF下面链接有详细的计算过程的例子:http://www.onsemi.cn/pub_link/Collateral/AN920-D.PDF