再考虑If = 8 mA或更大值的情况。当温度约为25...70 °C范围内的中 间值时,Vf大约为1.25 V。R5-R6上的压降现在变为0.64V (80.4Qx 8 mA)。也就是说:
Vdrop= 1.25 V +0.64 V= 1.89 V。
Q1的Vbe现已足够接通Q1。如果流经光电二极管的电流增大到9 mA, 则Vbe变为0.72V,Q1完全接通。多余的电流(由施加的24V输入提 供)从光电二极管中分流出去,耗散在Q1和D1中。
因此无论施加多大的电压是,^^^都不会超过大约2.0 V。此外,如 果流入4mA小电流,Vdrop也不会小于1.5 V。虽然温度会对光电二 极管压降产生的影响,但您可认为,当电流从4mA增大到8mA 时,Vdrop值从大约1.6 V相对线性增大到2.0 V。
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