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

Overview

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.

Order Now Model AC1301

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.

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 Ω> maximum; with +24 V DC supply voltage, the load resistance is increased to 850Ω maximum.

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.

AC1307
Order Now Model AC1307

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.

3B SERIES POWER SUPPLIES

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