Analog Devices 3B Series Power Supplies

Features Family of AC/DC Supplies Mountable Directly on Backplane Using Supplied Hardware Current Limit Short Circuit Protection Low Output Ripple and Noise Excellent Line and Load Regulation Characteristics Free-Air Convention Cooling: No external Heat Sink Required Analog Devices' line of AC/DC supplies offer system designers a means of supplying a reliable, easy to use, low cost solution to powering the 3B Series Signal Conditioning subsystem. These models provide high accuracy, short circuit protection, regulated outputs with very low noise and ripple characteristics. All supplies can be mounted directly on the 3B Series backplanes, Models 3B01, 3B02 and 3B03, using supplied mounting clip and hardware.

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Options for Powering a Backplane

Several backplane powering options are available to a user. The 3B Series Subsystem can operate from an AC/DC power supply or a DC/DC converter, mounted directly on the backplane, or external ±15 V DC and +24 V DC supplies can be used. The power supply voltages are bussed to all signal conditioners on the backplane. The +24 V DC voltage is supplied as loop power for all module current outputs. Supply current is a function of the modules that are actually used - see table below.

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3B Series Module Current Requirements

Model +15 V DC Current -15 V DC Current +24 V DC Current 3B16 45 mA 10 mA 27 mA 3B171 65 mA 65 mA 27 mA 3B18 50 mA 15 mA 27 mA 3B20 10 mA 10 mA 27 mA 3B30 10 mA 10 mA 27 mA 3B31 10 mA 10 mA 27 mA 3B32 10 mA 10 mA 27 mA 3B34 10 mA 10 mA 27 mA 3B37 12 mA 10 mA 27 mA 3B39 5 mA 5 mA 35 mA 3B40 10 mA 10 mA 27 mA 3B41 10 mA 10 mA 27 mA 3B42 10 mA 10 mA 27 mA 3B43 10 mA 10 mA 27 mA 3B44 10 mA 10 mA 27 mA 3B45 16 mA 16 mA 27 mA 3B46 19 mA 19 mA 27 mA 3B47 16 mA 14 mA N/A 1 Model 3B17 module typically needs 40 mA ±5 mA for the LVDT/RVDT drive current. The supply current for the LVDT/RVDT current is 75% of the LVDT/RVDT rms current.

If both +24 V DC and ±15 V DC are supplied from an external source, the power supply requirements must be satisfied for the desired number of modules. If the user wishes to use a +15 V supply for the module current outputs - loop power - in place of +24 V DC, the +15 V DC from the AC/DC supply can be strapped to the loop power on connector P3. With this arrangement, the load resistance on all module current outputs is limited to 400 maximum; with +24 V DC supply voltage, the load resistance is increased to 850 maximum.