Converter with cable voltage drop compensation
Output voltages of DCDC converters typically are precisely regulated at the location the feedback divider is connected. In case of longer connections to the load which, for example, is not on the same PCB the precision of the regulation suffers from the way the connection is established. If weight and connection count is critical, using sense wires or traces from the converter to the load is not an option. The weight also restricts the cross section of the wires which can be used. This means voltage drop which depends on the load current must be expected. Since this voltage drop cannot be fed back to the converter, compensation can only be done by adjusting the output voltage of the converter to match the voltage drop along the cables. This application report describes a circuit which addresses this problem at the output of a low voltage, highly efficient and small step-down converter which is typically used in such environments. The document also details the design and selection of the key components and provides measurement results showing the performance of the circuit.
View the PDF document for more information.
Originally published by Texas Instruments Inc. at www.ti.com as "Step-Down Converter with Cable Voltage Drop Compensation".
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