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LDO稳压器效率计算公式如下:
输入功率(PIN)和输出功率(POUT)可分别使用公式2和公式3计算:
当LDO稳压器静态电流(IB)小于输入电流(IIN)可以忽略不计时,公式2可近似如下:
将公式3和4代入公式1,得到:
对于串联稳压器,IIN=IOUT.
于是,
LDO稳压器效率可按输入电压(VIN))与输出电压(VOUT)比来计算。因此,LDO稳压器可用于构成高效电源,取决于输入和输出电压条件。