
UM Series
- 62.5V to 6kV, Fixed Negative or Positive Polarity
- Output Power of 4, 20 and 30 Watts
- V/I Regulation with Automatic Crossover Control
- V/I Current Monitor Signals; +5V Ref Output
- CE Listed, UL Recognized and RoHS Compliant
*Note: All specifications are subject to change without notice. Please consult the English PDF version of this datasheet for the most up-to-date revision.
DC-DC High Voltage Power Supplies
Form, Fit and Function Design:
Spellman’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 at competitive pricing. Utilizing proprietary power conversion technology and Spellman's six decades of high voltage experience, these SMT based high voltage modules provide improved performance/reliability and easier system integration at a lower cost when compared to the competition.
Advanced Power Conversion Topology:
UM converters use a proprietary zero voltage switching power conversion topology providing exceptional efficiency and inherent low noise and ripple. Radiated emissions are reduced compared to conventional switching topologies, minimizing or even eliminating the need to shield the unit from adjacent circuitry.
The high voltage output is generated using a ferrite core high voltage step up transformer which feeds the output circuitry. Units at 1kV or higher utilize an arrangement of half wave Cockcroft-Walton voltage multiplier stages to obtain the specified high voltage output, while lower voltage units use a robust rectification and filter circuit.
Due to the fixed, high frequency conversion rate the 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.
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 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 in addition to external monitoring purposes.
Due to the UM’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 Interface:
The Spellman UM Series interface provides current programming capability and positive polarity, buffered, low output impedance voltage and current monitor signals (zero to +4.64Vdc equals zero 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 current 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 features save the user the expense and implementation of external interface buffering circuitry while improving overall signal integrity. This standard interface is made available via a row of 13 pins with 0.1. pin spacing. A legacy interface (7 pins on a 0.2. spacing) that is compatible with presently available commercially made units can be provided by ordering the “L” option.
Mechanical and Environmental Considerations:
The UM Series are solid encapsulated, printed circuit board mountable, plastic cased converters measuring only 2.97. X 1.5. X 0.83. (75.4mm X 38.1mm X 21.1mm). All units are encapsulated using a silicon based potting material which is considerably lighter in weight than epoxy. Two isolated, non grounded 2-56 machine screws thread into the module to securely mount it to the printed circuit board, relieving any stress on the interface pins. Mounting plates, brackets and flanged mounting options are also available.
Regulatory Approvals:
Compliant to 2004/108/EC, the EMC Directive and Compliant to EEC EMC Directive. Compliant to EEC Low Voltage Directive. UL/CUL recognized, File E227588. RoHS Compliant.
Specifications
(Ref. 128068-001 REV. P)
Input Voltage:
12Vdc for 4W, 24Vdc for 20W and 30W
Nominal Voltage Range:
11Vdc to 30Vdc for 4W, 23Vdc to 30Vdc for 20W and 30W
Input Current: (typical)
Disabled: 30mA
No load: 90mA
Full load:
4 watt units: 0.5A
20 watt units: 1.0A
30 watt units: 1.5A
Efficiency:
80-85%, typical
Voltage Regulation:
Line: <0.01%
Load: <0.01%
Current Regulation:
Line: <0.01%
Load: <0.01%
Stability:
0.01% per 8 hours, 0.02% per day after 30 min. warmup
Accuracy:
2% on all programming and monitoring, except I Sense 10%
Temperature Coefficient: (typical)
Standard: 100ppm/°C Optional: 25ppm/°C (T Option)
Environmental:
Temperature Range:
Operating: 0°C to 65°C case temperature
Storage: -55°C to 85°C, non operational
Humidity:
10% to 90%, non-condensing.
Cooling:
Convection cooled, typical. 30 watt units operating at full power might require additional cooling to maintain case temperature below 65°C. Methods may include: forced air cooling, use of heat sink or metal case, etc. It is the user’s responsibility to maintain the case temperature below 65°C. Damage to the power supply due to inadequate cooling is considered misuse and repairs will not be covered under warranty.
Dimensions:
2.96. L X 1.49. W X 0.81. H (75.2mm X 37.9mm X 20.6mm)
Weight:
4 oz. (113g), typical
See product PDF for more specification and features.
UM 4W SELECTION TABLE
Model Number | Output V | Output Current | Low Freq. Ripple %Vp-p @ 1Hz-1kHz | High Freq. Ripple %Vp-p @ 1kHz-1MHz | Output Capacitance | Arc Limiting Resistanc | I Sense Scaling Full Scale Signal | High Voltage Divider Resistance |
---|---|---|---|---|---|---|---|---|
UM0.062*4 | 0 to 62.5V | 64mA | 0.030 | 0.028 | 8.8μF | 1Ω | 1.5V | 0.5MΩ |
UM0.125*4 | 0 to 125V | 32mA | 0.045 | 0.014 | 8.8μF | 4.4Ω | 2.75V | 0.88MΩ |
UM0.25*4 | 0 to 250V | 16mA | 0.034 | 0.017 | 2.2μF | 20Ω | 4.9V | 1.50MΩ |
UM0.5*4 | 0 to 500V | 8mA | 0.036 | 0.040 | 0.8μF | 94Ω | 10.1V | 2.65MΩ |
UM1*4 | 0 to 1KV | 4mA | 0.025 | 0.015 | 0.2μF | 470Ω | 10.75V | 20MΩ |
UM2*4 | 0 to 2kV | 2mA | 0.022 | 0.015 | 0.097μF | 1.0KΩ | 10.4V | 30MΩ |
UM4*4 | 0 to 4kV | 1mA | 0.019 | 0.017 | 0.012μF | 9.4KΩ | 11.1V | 100MΩ |
UM6*4 | 0 to 6kV | 0.67mA | 0.016 | 0.015 | 0.007μF | 20KΩ | 9.9V | 150MΩ |
UM 20W SELECTION TABLE
Model Number | Output V | Output Current | Low Freq. Ripple %Vp-p @ 1Hz-1kHz | High Freq. Ripple %Vp-p @ 1kHz-1MHz | Output Capacitance | Arc Limiting Resistance | I Sense Scaling Full Scale Signal | High Voltage Divider Resistance |
---|---|---|---|---|---|---|---|---|
UM0.062*20 | 0 to 62.5V | 320mA | 1Hz-1kHz 0.060 | 0.088 | 8.8μF | 1Ω | 330mV | 0.5MΩ |
UM0.125*20 | 0 to 125V | 160mA | 0.067 | 0.044 | 8.8μF | 4.4Ω | 675mV | 0.88MΩ |
UM0.25*20 | 0 to 250V | 80mA | 0.035 | 0.019 | 2.2μF | 20Ω | 1.135V | 1.50MΩ |
UM0.5*20 | 0 to 500V | 40mA | 0.041 | 0.040 | 0.8μF | 94Ω | 2.25V | 2.65MΩ |
UM1*20 | 0 to 1KV | 20mA | 0.039 | 0.095 | 0.2μF | 470Ω | 4.35V | 20MΩ |
UM2*20 | 0 to 2kV | 10mA | 0.026 | 0.016 | 0.097μF | 1.0KΩ | 6.6V | 30MΩ |
UM4*20 | 0 to 4kV | 5mA | 0.023 | 0.028 | 0.012μF | 9.4KΩ | 6.65V | 100MΩ |
UM6*20 | 0 to 6kV | 3.3mA | 0.017 | 0.018 | 0.007μF | 20KΩ | 6.74V | 150MΩ |
UM 30W SELECTION TABLE
Model Number | Output V | Output Current | Low Freq. Ripple %Vp-p @ 1Hz-1kHz | High Freq. Ripple %Vp-p @ 1kHz-1MHz | Output Capacitance | Arc Limiting Resistance | I Sense Scaling Full Scale Signal | High Voltage Divider Resistance |
---|---|---|---|---|---|---|---|---|
UM0.062*30 | 0 to 62.5V | 480mA | 0.075 | 0.112 | 8.8μF | 1Ω | 500mV | 0.5MΩ |
UM0.125*30 | 0 to 125V | 240mA | 0.075 | 0.056 | 8.8μF | 4.4Ω | 930mV | 0.88MΩ |
UM0.25*30 | 0 to 250V | 120mA | 0.055 | 0.031 | 2.2μF | 20Ω | 1.65V | 1.50MΩ |
UM0.5*30 | 0 to 500V | 60mA | 0.085 | 0.041 | 0.8μF | 94Ω | 3.4V | 2.65MΩ |
UM1*30 | 0 to 1KV | 30mA | 0.032 | 0.171 | 0.2μF | 220Ω | 6.5V | 20MΩ |
UM2*30 | 0 to 2kV | 15mA | 0.031 | 0.112 | 0.097μF | 470Ω | 9.85V | 30MΩ |
UM4*30 | 0 to 4kV | 7.5mA | 0.028 | 0.071 | 0.012μF | 4.4KΩ | 9.85V | 100MΩ |
UM6*30 | 0 to 6kV | 5mA | 0.020 | 0.051 | 0.007μF | 9.4KΩ | 10.0V | 150MΩ |
Note: Total ripple is the sum of the low frequency and high frequency ripple. Grayed text indicates Legacy interface signals.
STANDARD INTERFACE
Pin | Signal | Parameters |
---|---|---|
1 | Power Ground Return | +12Vdc or +24Vdc power return/HV return |
1A | Signature Resistor | Unique Identifying resistor connected to ground |
2 | + Power Input | +12Vdc or +24Vdc power input |
2A | N/C | |
3 | I Sense | See I Sense text and tables |
3A | I Mon | 0 to 4.64Vdc = 0 to 100% rated output. Zout < 10kΩ |
4 | Enable Input | Low (<0.7V, Isink@1mA)=HV OFF, High (open or >2V)=HV ON |
4A | V Mon | 0 to 4.64Vdc = 0 to 100% rated output. Zout < 10kΩ |
5 | Signal Ground | Signal Ground |
5A | I Pgm | 0 to 4.64Vdc = 0 to 100% rated output. Zin > 47kΩ Leave open for preset current limit @103% of rated output current |
6 | Remote Adjust | Positive Polarity Unit: 0 to +4.64VDC = 0 to 100% rated voltage, Zin >1MΩ Negative Polarity Unit: +5VDC to 0.36V = 0 to 100% rated voltage, Zin >100kΩ Leave open if pin 6A (VPgm) is used for programming |
6A | V Pgm | 0 to 4.64Vdc = 0 to 100% rated voltage. Zin > 100kΩ Leave open if pin 6 (remote adjust) is used for programming |
7 | +5V Reference Output | +5Vdc ±0.5%, 50ppm/°C. Zout =475Ω |
8 | HV Ground Return | HV Ground Return |
9 | E Out Monitor | 10:1 ratio for models below 1kV, 100:1 ratio for models 1kV and above. Polarity of Voltage Monitor signal equals polarity of unit. Accuracy is ±2%, 100ppm/°C. Calibrated with DVM with 10MΩ input impedance |
10 | HV Output | HV Output |
11 | HV Output | HV Output |
Grayed out signals are provided for backward legacy compatibility and their use is not required
Power Ground Return, Signal Ground and HV Ground Return are connected
internally. For best performance they should not be connected externally.
LEGACY INTERFACE (L OPTION)
Pin | Signal | Parameters |
---|---|---|
1 | Power Ground Return | +12Vdc or +24Vdc power return/HV return |
2 | + Power Input | +12Vdc or +24Vdc power input |
3 | I Sense | See I Sense text and tables for details |
4 | Enable Input | Low (<0.7V, Isink@1mA)=HV OFF, High (open or >2V)=HV ON |
5 | Signal Ground | Signal Ground |
6 | Remote Adjust | Positive Polarity Unit: 0 to +4.64VDC = 0 to 100% rated voltage, Zin >1MΩ Negative Polarity Unit: +5VDC to 0.36V = 0 to 100% rated voltage, Zin >100kΩ |
7 | +5V Reference Output | +5Vdc ±0.5%, 50ppm/°C. Zout =475Ω |
8 | HV Ground Return | HV Ground Return |
9 | E Out Monitor | 10:1 ratio for models below 1kV, 100:1 ratio for models 1kV and above. Polarity of Voltage Monitor signal equals polarity of unit. Accuracy is ±2%, 100ppm/°C. Calibrated with DVM with 10MΩ input impedance |
10 | HV Output | HV Output |
11 | HV Output | HV Output |
Power Ground Return, Signal Ground and HV Ground Return are connected internally. For best performance they should not be connected externally.
Tables & Diagrams
DIMENSIONS: in.[mm]
17 PIN - Standard Interface
11 PIN - Standard Interface
Frequently Asked Questions
What Is a Safe Level of High Voltage?
Where Can I Obtain Information on High Voltage Safety Practices?
How Should I Ground Your Supply?
Why Is Arcing an Issue for a High Voltage Power Supply?