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TPS732: 关于偏置电源轨的疑问

Part Number: TPS732

VBIAS电压虽然可以维持很高,但VIN一旦减小的很低就会使NMOS跨过饱和区进入可变电阻区。进入可变电阻区LDO也是在正常工作的吗?

Although the VBIAS voltage can be maintained very high, once the VIN is reduced very low, NMOS will cross the saturation region and enter the variable resistance region.  Is the LDO working properly in the variable resistance area?