Analog Devices 3B Series Power Supplies

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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.

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Selecting a Power Supply

The following supplies, available from Analog Devices, operate over a -25°C to +70°C temperature range. Refer to the power supply specification table for more detailed information on each supply. Model AC1301 is an AC/DC dual output, ±15 V DC power supply providing ±350 mA; it is mounted on the backplane with supplied mounting clip and hardware. Model AC1307 is an AC/DC triple output, +15 V DC, -15 V DC and +24 V DC power supply providing +800 mA, -225 mA and +350 mA respectively. Model AC1307 is mounted on the backplane using supplied hardware.

Order Now   Model AC1307

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3B Series Power Supply Specifications
(typical @ +25°C and Nominal Input Voltage)

Description	Model AC1301	Model AC1307
Type	AC/DC	AC/DC
Input Voltage Range	105 V rms to 125 V rms	105 V rms to 125 V rms
Frequency	50 Hz to 250 Hz	50 Hz to 400 Hz
Output Voltage	±15 V dc	+15 V dc/-15 V dc/ +24 V dc
Output Current	±350 mA	+800 mA/-255 mA/ +350 mA
Short Circuit Protection2	Current Limited	Current Limited
Voltage Accuracy	±1%, max.	±5% max. (±15 V dc Outputs) +20 V dc min. to +32 V dc max.
Temperature Coefficient	±0.02%/°C	±0.05%/°C
Line Regulation	±0.02% max.	±0.1%
Load Regulation	±0.02% max.	±0.1%
Ripple & Noise	0.5 mV rms, max.	±20 mV pk-pk (±15 V dc Outputs) 1 V pk-pk (+24 V dc Output)
Breakdown Voltage	2500 V rms, min.	1500 V rms, min.
Switching Frequency	N/A	N/A
Operating Temperature Range	-25°C to +70°C	-25°C to +70°C
Storage Temperature Range	-25°C to +85°C	-25°C to +85°C
Cooling	Free Air Convection	Free Air Convection
PC Mountable	Yes	Yes
Encapsulated	Yes	No
Mounting Threaded Inserts	Four, #4-40 x 0.15" deep	Two, #6-32 Stand-Off

1 Accuracy for +24 V dc output: +20 V dc minimum with low line and full load; +32 V dc maximum with high line, 20 mA load.
2 Substantial overload can be withstood, including direct short. Prolonged operation should be avoided since excessive temperature rises will occur.
Specifications subject to change without notice.

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