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VOLTAGE GENERATOR WITH CURRENT SOURCE COMPENSATED FOR AN ERROR CURRENT OPERABLE OVER A WIDE VOLTAGE RANGE
VOLTAGE GENERATOR WITH CURRENT SOURCE COMPENSATED FOR AN ERROR CURRENT OPERABLE OVER A WIDE VOLTAGE RANGE
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机译:具有电流源的电压发生器补偿了在整个电压范围内可操作的错误电流
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摘要
In one embodiment, a regulator circuit for generating a regulated output voltage Vout has an error amplifier using a pair of bipolar transistors at its front end. The error amplifier compares the regulated output voltage to a reference voltage Vref. A precision current source draws a first current through a user-selected set resistance to generate the desired Vref. The regulator circuit controls a power stage to cause Vout to be equal to Vref. The base current into one of the bipolar transistors normally distorts the current through the set resistance. A base current compensation circuit is coupled to the current source to adjust the first current by a value equal to the base current to offset the base current. Therefore, Vref is not affected by the base current. The error amplifier may be in a linear regulator or a switching regulator. The compensation circuit may be used in other applications.
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