UM MANUAL
1
118098-001 REV B
Chapter 1
I
NTRODUCTION
1.1 Description of the UM Series
pellman’s UM Series of printed circuit board
mountable, high voltage modules offer a form, fit and
function replacement for presently available
commercially made units, while providing additional
features and benefits. Utilizing proprietary power
conversion technology these SMT based high voltage
modules provide improved performance, reliability and
easy system integration.
The UM is available in three power ranges of 4, 20 and
30 watts with output voltages spanning from 62.5 volts to
6kV with fixed positive or negative polarities. Voltage &
Current loops with automatic cross over control regulate
the output into any load condition. The UM is a reliable
and robust series that is arc and short circuit protected.
The comprehensive standard interface provides
interfacing flexibility and all UM’s are CE and RoHS
compliant.
1.2 Standard
Features
The UM Series incorporates several standard features
designed to optimize user satisfaction and safety:
●
Slow Start:
A 10 millisecond slow start time constant
assures quick yet fully controllable risetime of the high
voltage output.
●
Current Regulating Loop:
Current programmability
allows the user to set where the unit will current limit,
anywhere from 0 to 100% of maximum rated current.
●
0 to +4.64Vdc Programming Inputs:
Positive
polarity, high impedance, ground referenced 0 to 4.64Vdc
voltage programming inputs correspond to 0 to 100%
rated voltage and current outputs.
●
0 to +4.64Vdc Monitor Outputs:
Positive polarity,
low impedance, ground referenced 0 to 4.64Vdc voltage
monitor outputs correspond to 0 to 100% rated output
voltage and current.
●
Pre5Vdc Reference Output:
A precision
micro power band gap reference of +5Vdc, ±0.5%,
25ppm/°C with an output impedance of 475
Ω
is provided
to simplify remote programming of the power supply.
●
Arc and Short Circuit Protected:
Due to the fixed,
high frequency conversion rate the UM’s output
capacitance is small resulting in minimal stored energy.
Through the use of generously rated surge limiting
resistors and a fast acting current loop, all units are fully
arc and short circuit protected.
1.3 Remote Operating Features
●
Enable Input:
The Enable Input allows the user to
easily control the HV ON/HV OFF status of the power
supply. HCMOS compatible signals A low (<1.5Vdc)
enable input signal equals HV OFF, while a high (open or
>3Vdc) enable signal equals HV ON.
Warning
!
The Enable Input should not be used as for
protection against user injury or for a safety
interlock function.
S
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