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Regulator Circuit with Multiple Outputs Using LM107

2018-01-21 05:56  
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The regulator circuit where the output setting resistor is tapped to provide multiple output voltage to op amp buffers. An additional transistor is included as part of the overload protection. When any of the outputs are shorted, the op amp will current limit and a voltage will be developed across its inputs. This will turn “ON” the transistor and pull down the adjustment terminal of the LM117, causing all outputs to decrease, minimizing possible damage to the rest of the circuitry. Ordinary 3-terminal regulators are not especially attractive for use as precision current regulators. Firstly, the quiescent current can be as high as 10 mA, giving at least 1% error at 1A output currents, and more error at lower currents. Secondly, at least 7V is needed to operate the device. With the LM117, the only error current is 50 μA from the adjustment terminal, and only 4.2V is needed for operation at 1.5A or 3.2V at 0.5A. Here is a schematic circuit:

Regulator Circuit with Multiple Outputs Using LM107 Regulator Circuit with Multiple Outputs Using LM107

Source circuit : National Semiconductor Application

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