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lm27402 按照ti网站设计输出电压偏低

Other Parts Discussed in Thread: CSD87350Q5D, LM27402

使用lm27402 design calc 设计, 做了一些调整,把mos 2颗换成了1颗 csd87350q5d

结果发现设置为1v电压的时候, 输出电压只有0.95v

基准电压0.6v不足 ,差不多只有0.55v,怀疑是这个原因造成

是因为把mos管换了的问题吗? 之前用27403配合87350q5d没这种现象, 盼解答。

手里没有86350q5d 用差不多的87350q5d更换

www.deyisupport.com/.../dc-dc-pcb-2.aspx

官方datasheet的 mos是

QL N-CH MOSFET 30 V, 60 A, 43.5 nC, RDS(on) at 4.5 V = 1.85 mΩ Si7192DP 1 Vishay

QH N-CH MOSFET 25 V, 40 A, 13 nC, RDS(on) at 4.5 V = 6.2 mΩ SiR436DP 1 Vishay

我更换的是

30 V Power Block Q5D MOSFET Module, 5 mm x 6 mm Texas Instruments CSD87350Q5D