obsidian-notes/电源/MOS/P.md
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P 2022-08-08 08:55:52Z 2022-01-08 13:18:01Z



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FDN340P √

Single P-Channel, Logic Level, PowerTrench MOSFET

开启电压2.5V



FDN304P

P-Channel 1.8V Specified PowerTrench MOSFET

开启电压1.8V


P-MOS基本用法S接电压高端D接负载G接控制端高断低通,参考USRP-X3X0-PWR.png


SI2305/SI2301

解释:

IN为5vVon=-1.8V~-2.5V

偏置电阻分压比例k=2/2+4.7=1/2.35

CTL为0v此时Vgs=-5-0*k=-1.5V,虽不一定能够完全开启,但足够需求(负载=100mA时Vd=5V

CTL为3.3v此时Vgs=-5-3.3*k=-0.5V,虽不一定能够完全关断,但足够需求(负载=100mA时Vd=0V


N管替换P管电路N管导通阻抗更低P+接负载):



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