LDO ouptut voltage followed by VDD

frank822

如果VDD 3.3V, bandgap電壓1.5V, 得Vout 3V.
當VDD 變3V, bandgap電壓1.5V,如何讓Vout變2.7V.
要確保power mos saturation, 電流流過 1A.
) q, U4 V, x' s- L9 l% a3 A
方法一: detect VDD voltage, then? ....control feedback resistor?
) l% W; b: E6 f% C9 {* y3 W1 @方法二: detect power mosfet saturation? how to detect?
其他方法?
各位先進 請指導依下 謝謝

c3a1t039

你有想過在bandgap後面加上LDO去做調節??