Chapter: Linear Integrated Ciruits - Application of ICs

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IC723 as a LOW voltage LOW current

R1 & R2 from a potential divider between Vref& Gnd.

IC723 as a LOW voltage LOW current :

 


R1 & R2 from a potential divider between Vref& Gnd.


·           The Voltage across R2 is connected to the Non – inverting terminal of the regulator IC



·           Gain of the internal error amplifier is large


      Therefore the Vo is connected to the Inverting terminal through R3 & RSC must also be equal to Vnon-inv


R1 & R2 can be in the range of 1 KΩ to 10KΩ & value of R3 is given by


·           Rsc (current sensing resistor) is connected between Cs & CL. The voltage drop across Rsc is proportional to the IL.

 

·           This resistor supplies the output voltage in the range of 2 to 7 volts, but the load current can be higher than 150mA.

 

 

·           The current sourcing capacity is increased by including a transistor Q in the circuit





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