UMW Series

Voltage from 8kV to 20kV, Fixed Negative or Positive Polarity
Output Power of 60 and 125 Watts
V/I Regulation with Automatic Crossover Control
Voltage and Current Monitor Signals
UL Recognized, CE Listed and RoHS Compliant

Certifications & Compliance

60-125W High Voltage Power Supplies

Form, Fit and Function Usability:

Spellman’s UMW Series of high voltage modules provides users with a form, fit and function replacement for presently available commercially made units, while providing superior features and benefits at competitive pricing. Utilizing proprietary power conversion technology, unique high voltage packaging, and Spellman’s unmatched encapsulation techniques, these SMT based high voltage modules provide improved performance and easier system integration at a lower cost when compared to the competition.

Advanced Power Conversion Topology:

UMW converters use a proprietary resonant power conversion topology providing exceptional efficiency and inherent low noise and ripple outputs. Radiated emissions are dramatically reduced compared to conventional switching topologies, effectively minimizing or even eliminating the need to shield the unit from adjacent circuitry.

The high voltage output is generated through the use of a ferrite core high voltage step up transformer which feeds the high voltage output circuitry. Units utilize an appropriate arrangement of low capacitance Cockcroft-Walton voltage multiplier stages to obtain the specified high voltage output.

Due to the fixed, high frequency conversion rate of the converter, the output capacitance is small resulting in minimal stored energy and fast rise times. Through the use of generously rated surge limiting resistors and a fast acting current loop, all units are fully arc and short circuit protected.

Control and Regulation:

The actual output voltage generated is sampled via a high impedance divider to create a voltage feedback signal. A current feedback signal is created via a current sense resistor being placed in the low end return of the high voltage output circuitry. These two accurate ground referenced feedback signals are used to precisely regulate and control the units output. These accurate and calibrated signals are also used for external monitoring purposes.

Due to the UMW’s unique converter topology it can provide full current into low impedance loads or even a short circuit. Standard units limit at 103% of maximum rated output current.

Standard User Interface:

The Spellman UMW Series offers a standard customer interface that provides current programming capability and positive polarity, buffered, low output impedance voltage and current monitor signals (0 to +4.64Vdc equals 0 to full scale rated). A voltage programming input is provided where 0 to +4.64Vdc equals 0 to 100% of rated voltage.

Current programmability allows the user to set where the unit will current limit, anywhere from 0 to 100% of maximum rated current. This feature is beneficial where less than full output is desired, like in the case of protecting a sensitive load.

The buffered low impedance voltage and current monitor signals can drive external circuitry directly, while minimizing loading and pickup effects. These feature save the user the expense and implementation of external interface buffering circuitry while improving overall signal integrity.

Mechanical and Environmental Considerations:

The UMW Series are modular sheet metal enclosed converters measuring 8.00. X 4.50. X 1.075. (203mm X 114mm X 27mm). All units are encapsulated using a propriety silicon based potting material which is considerably lighter in weight than epoxy encapsulation techniques. Physical mounting of the unit is accomplished via the use of bottom mounted studs or threaded blind inserts, dependent upon model ordered.

Specifications
Models
How to Order
Downloads

Specifications

Input Voltage:
24Vdc
Normal Voltage Range:
23Vdc to 30Vdc
Derated Voltage Range:
11Vdc to 30Vdc
Input Current:
(typical)
Disabled:
<40mA
No load:
<600mA
Full load:
60 watt units: 3 amps
125 watt units:
6.2 amps
Dimensions:
8.00. L X 4.50. W X 1.075. H (203mm X 114mm X 27mm)

Models

UMW 60W SELECTION TABLE

Model Number

Output V

Output Current

Ripple(max) %Vp-p

Output Capacitance

Arc Limiting Resistance

I Sense Scaling Full Scale Signal

UMW8*60

0 to 8kV

7.5mA

<1.0 (C load ≥0.05μF

3553pF

14.1kΩ

1.6V

UMW10*60

0 to 10kV

6mA

<1.0 (C load ≥0.05μF

3553pF

14.1kΩ

1.47V

UMW12*60

0 to 12kV

5mA

<1.0 (C load ≥0.05μF

2870pF

30kΩ

1.24V

UMW15*60

0 to 15kV

4mA

<1.0 (C load ≥0.05μF

2460pF

30kΩ

1.0V

UMW20*60

0 to 20kV

3mA

<1.0 (C load ≥0.01μF)

2460pF

45kΩ

4.61V

UMW 125W SELECTION TABLE

Model Number	Output V	Output Current	Ripple(max) %Vp-p	Output Capacitance	Arc Limiting Resistance	I Sense Scaling Full Scale Signal
UMW8*125	0 to 8kV	15.5mA	<1.0 (C load ≥0.05μF	7106pF	3kΩ	Signal 1.1V
UMW10*125	0 to 10kV	12.5mA	<1.0 (C load ≥0.05μF	7106pF	3kΩ	1.15V
UMW12*125	0 to 12kV	10.5mA	<1.0 (C load ≥0.05μF	5740pF	6.6kΩ	1.40V
UMW15*125	0 to 15kV	8.3mA	<1.0 (C load ≥0.05μF	4920pF	6.6kΩ	1.1V
UMW20*125	0 to 20kV	6.25mA	<1.0 (C load ≥0.01μF	4920pF	14.1kΩ	9.57V

Grayed text indicates Legacy interface signals.

How to Order

ORDERING INFORMATION

Voltage	0 to 8kV	8
	0 to 10kV	10
	0 to 12kV	12
	0 to 15kV	15
	0 to 20kV	20
Polarity	Positive	P
	Negative	N
Power	60Watts	60
	125Watts Output	125

Downloads

Mass Spectrometry Brochure

Service Solution Brochure

Spellman Repair Centers, Extended Warranty Programs, Preventative Maintenance Programs, Calibration Services and more.

Download

2026 High Voltage Reference Manual

We compiled all of our useful FAQ’s, application notes, articles, technical papers and three glossaries into a single handy reference guide.

Download

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