Brandenburg 833 Series Data Sheet
X-Ray Image Intensifier Power Supply
5 Fully Regulated High Voltage Outputs

Model 833 Series

Features

24V nominal input
Vacuum condition monitor output
Good line and load regulation
Low output ripple and noise
Compact size
Proof against output short circuits and arcing
Remote programming of G1,2 & 3 outputs
High voltage components fully encapsulated

Description

The Brandenburg model 833 has been designed for the special needs of the medical and industrial image intensifier market. This unit employs two high frequency switching regulators to directly generate G3 and G5. The G5 inverter also powers a linear post regulator for G1 and G2, plus a resistive current limited source for G4 (getter). Incoming power is filtered by a linear regulator for excellent line rejection and protection. Control lines (G1, G2, and G3) have good (ground) common mode rejection, with separate power and signal zero rails. A Vacuum Monitor output detects when the G4 (getter) current falls below 1ľA.


Ordering Information
& High Voltage Outputs
Input VoltageOutput VoltageOutput CurrentControlOrder Code
24 V dc G1: 75V to 350V 3ľA 0 to +10V 833
G2: 400V to 1200V 1ľA 0 to +10V
G3: 2.75kV to 10.3kV1ľA 0 to +10V
G4: 2.5kV to 3kV 10ľAnone
G5: 30kV ( +/-150) 3ľAnone

Electrical Specification
Input
Voltage range +20.4V to 26.4V dc
Line ripple Up to 0.5V pk/pk
Regulation +/-0.05%, between 20.4V and 26.4V
Current (nominal) 220mA max outputs @ full load
Current (Maximum) 300mA
Output
(G1,2,3 & 5)
Voltage range see Ordering Information and high voltage outputs
Current see Ordering Information and high voltage outputs
Control(G1,2 & 3)Outputs are proportionally controlled, each by an analogue input signal, 0 to +10V, with an accuracy of +/-2% of demand. The control input impedance is >10kohm. The CMRR is > 40dB with a CM range +/-0.5V. The HV range is internally limited to 115% of maximum rating if over driven.
(G5) None
Regulation +/-0.3 (load)
Ripple <0.3% pk-pk, over line and load range
Temperature coefficient <+/-0.05% per degC between +5 and +55 degC
Drift <+/-0.5% over 8 hour
Response time(power on) 5% in <3 seconds
range change: G1/G2/G3, <1 second, min to max demand
Output (G4)
Regulation (load) 2.5kV to 3.0kV output @ <10ľA load
Ripple (lf & hf) <1% pk-pk, @ <10ľA load
Protection Proof against output short circuits of any duration
Vacuum condition monitor
Threshold condition When G4= 1ľA, (+/-20%)
Output Open collector, 30V/20mA max
Load (typical) External LED & resistor to positive rail
Status Open: if I (G4) <1ľA
Closed: if I (G4) >1ľA
Protection All HV outputs are protected against intermittent flash-over and continuous short circuit to ground without damage to the HV power supply. The G5 is protected from exceeding 32kV and will shut-down the power supply. An internal, factory fitted (UL) fuse-link protects against failure on the 24V rail or reverse polarity connection.

Environmental Specification
Operating temperature range +5 to +55 deg.C
Storage temperature range -10 to +70 deg.C
Humidity 95%, +55 degC Non condensing
MTBF 35,000 hours

Mechanical Specification
Dimensions 160 x 52.5 x 115mm (6.3" x 2.1" x 4.5")
Packaging Aluminium case, black anodized, with resilient encapsulation.
Input connector 10 way ribbon connector
Outputs 5 off of type BB-0512-50 HV connector (mating half supplied)
Mounting Four M3 X 6mm deep inserts on 140 x 102 mm centres.

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