Changes between Version 2 and Version 3 of DDS_Voltage_Regulator


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Timestamp:
Dec 4, 2013, 2:42:34 PM (10 years ago)
Author:
tnadov
Comment:

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  • DDS_Voltage_Regulator

    v2 v3  
    99=== Overview
    1010
    11 The board revives an input voltage of roughly 5V from a 4 pin 0.156" spaced cable with alternating power and ground pins. This voltage is then passed as the input to two [http://ohm.bu.edu/~tnadov/ddsr/data/lm317.pdf LM317 voltage regulators], one with a resistor configuration set to output 1.8V, the other with a resistor configuration set to output 3.3V. These voltages are then output via three additional 4 pin headers, each of which outputs the configuration [[_1.8V,_GND,_3.3V,_GND_]] Each DDS board will be drawing roughly 200mA for each required voltage, meaning that the 1.8V regulator will conduct roughly 0.6A (each regulator will power 3 boards) and drop roughly 3.2V (assuming 5V input). This will result a power dissipation of about 1.92W. Higher input voltages will result in higher power dissipation. The junction to case thermal resistance for the regulator is 17°C/W and the junction to heat sink thermal resistance is 3°C/W. I've also made four custom cables for this board. Three connect to the output headers for wiring to the screw terminals on the DDS development board and the fourth connects the input of the regulator to the output of the main regulator in the system.
     11The board revives an input voltage of roughly 5V from a 4 pin 0.156" spaced cable with alternating power and ground pins. This voltage is then passed as the input to two [http://ohm.bu.edu/~tnadov/ddsr/data/lm317.pdf LM317 voltage regulators], one with a resistor configuration set to output 1.8V, the other with a resistor configuration set to output 3.3V. These voltages are then output via three additional 4 pin headers, each of which outputs the configuration 1.8V,GND,3.3V,GND Each DDS board will be drawing roughly 200mA for each required voltage, meaning that the 1.8V regulator will conduct roughly 0.6A (each regulator will power 3 boards) and drop roughly 3.2V (assuming 5V input). This will result a power dissipation of about 1.92W. Higher input voltages will result in higher power dissipation. The junction to case thermal resistance for the regulator is 17°C/W and the junction to heat sink thermal resistance is 3°C/W. I've also made four custom cables for this board. Three connect to the output headers for wiring to the screw terminals on the DDS development board and the fourth connects the input of the regulator to the output of the main regulator in the system.
    1212
    1313=== Usage