Long_life_IR_drop_voltage_recover_system

Published:2009/7/24 8:53:00 Author:Jessie | From:SeekIC

This circuit provides a unique solution to a common system-level power-distribution problem. When the supply voltage to a remote board must traverse a long cable, the voltage at the end of the line sometimes drops to unacceptable levels. This circuit solves the problem by taking the reduced voltage at the end of the supply line and boosting it back to +5 V. This can be especially useful in remote-display devices, such as some point-of-sale (POS) terminals, where several meters of cable can separate the terminal from the readout. The 3.2: 1 turns ratio of the transformer allows the MAX631 to provide more than the usual output current, without an external MOSFET, at these relatively low operating voltages. Output current is 150mA at 5 V, with an input of 4 to 5 V. The MAX631 also makes use of the reflected voltage in the transformer primary to generate a higher supply voltage of about +9 V. By operating at 9 V, rather than 5 V, the on resistance of LX is reduced.



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