MPD Series

  • Extremely Compact High Performance Module
  • Digital or Differential Analog Voltage Program
  • Standard RS-232/RS-485 Control
  • 10 Watts Output Power
  • High Stability, Low TC
  • Digital Oscillator Provides Ultra Low Ripple and Noise, Down to 1/f Band

*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.

CE ROHS Marking 

Spellman MPD Series of High Voltage 10 Watt Modules

Spellman’s new MPD series are a family of high voltage 10 Watt modules that provide output voltages ranging from 2.5kV to 20kV.

The MPD series are high performance products designed with Spellman’s hybrid topology of linear and switch mode power conversion techniques delivering lower noise with higher efficiency. The MPD series produces excellent ripple and stability performance specifications from a compact footprint. The MPD series features a differential amplifier input for the voltage programming signal to improve immunity from external system noise and addressing any offset issues.

A fully featured remote user interface is provided via 15-pin D-type connector as well as RS-232/RS-485 serial interface. The unit can be full analog or full digital control defined by interface connector links.

Spellman’s proprietary HV technology coupled with SMT circuitry results in an ultra compact and lightweight module that is available as either a positive or negative supply that is ideal for OEM applications.

Typical Applications

  • Photomultiplier Tubes
  • Electrostatic Printing
  • Electron and Ion Beams
  • Scintillators
  • Electronmultiplier Detectors
  • Mass Spectrometry
  • Microchannel Plate Detectors
  • Electrostatic Lenses
  • Nuclear Instruments


(Ref. 128142-001 REV. D)


Input Voltage:
+24 Vdc, ±2Vdc

Input Current:
≤1 amp maximum

Output Voltage:
5 models available from 2.5kV to 20kV

Output Polarity:
Positive or negative, specify at time of order

10 watts, maximum

Voltage Regulation:

Line: For a 1V line change 10ppm
Load: 0-100% load 10ppm

Current Limit:
110% of rated output current

See “drift, ripple and noise” table

After one hour warm up period.
25ppm/8 hours
100ppm/1000 hours

Temperature Coefficient:
10ppm per degree C

Arc and short circuit protected. Not designed to withstand continuous arcing


Temperature Range:
Operating: 0˚C to 50˚C
Storage: -35˚C to 85˚C

20% to 85% RH, non-condensing

Convection cooled

2.5-10kV: 1.18˝ H X 2.75˝ W X 5.12˝ D (30mm x 70mm x 130mm)
15-20kV: 1.18˝ H X 2.75˝ W X 6.50˝ D (30mm x 70mm x 165mm)

14.82 oz. (420g)
22.09 oz. (650g)

Interface Connector:
15 pin male D connector

Output Connector:
A captive 39.4˝ (1 meter) long HRG58 shielded HV cable is provided

Regulatory Approvals:
UL recognized component (RC), File E354595. Compliant to IEC/UL 61010-1 Safety requirements for electrical equipment for control and laboratory use; CAN/CSA-C22.2 No.61010-1. CE marked to EN 61010-1. UKCA marked to BS EN 61010-1. RoHS compliant.

As the unit is designed for incorporation within the users system it is not tested against any specific EMC standards. The user will need to take sensible EMC precautions when designing the unit in and verify the overall system EMC performance against any relevant standards.



Model Output Voltage Output Current  Ripple (Vpp) 
MPD2.5*10/24 2.5kV  4.00 mA See table below 
MPD5*10/24 5kV 2mA  See table below 
MPD10*10/24 10kV 1mA  See table below 
MPD15*10/24  15kV  0.66mA  See table below 
MPD20*10/24 20kV 0.5mA  See table below 


Model 3mHz-30mHz 30mHz-3Hz 3Hz-30Hz 30Hz-300Hz 300Hz-30kHz 30kHz-3MHz
MPD2.5 10mV 10mV
10mV  5mV  5mV   5mV
MPD5 10mV 10mV 10mV  10mV  10mV  10mV 
MPD10  20mV  20mV 20mV 20mV  20mV  20mV 
MPD15  30mV  30mV  30mV  30mV  30mV  30mV 
MPD20  40mV  40mV  40mV  40mV  40mV  40mV 


Pin Signal Parameters
1 Power Ground Ground
2 +24Vdc Input +24Vdc @ 1 amp maximum
3 Voltage Monitor Output Voltage monitor 0-10Vdc for 0 to full scale output ±1%
(wrt signal ground) Zout=10kΩ
4 Voltage Reference Output 10Vdc @ 1mA maximum
5 Voltage Program Input 0 to 10Vdc=0 to 100% rated output ±1%, Zin=10MΩ
6 Voltage Program Differential
Amplifier Output
0 to 10Vdc=0 to 100% rated output, Zout =10kΩ
7 Voltage Program Differential
Amplifier Input—Positive
0 to 10Vdc differential between pin 7 and pin 9 =
0 to 100% of rated output, diode clamped to ground,
Zin =38kΩ
8 Current Monitor Output 0-10Vdc for 0 to full scale output ±1%
(wrt signal ground) Zout=10kΩ
9 Voltage Program Differential
Amplifier Input—Negative
0 to 10Vdc differential between pin 7 and pin 9 =
0 to 100% of rated output, diode clamped to ground,
Zin =38kΩ
10 Voltage Program
Digital Output
0 to 10Vdc = 0 to 100% rated output, Zout =10kΩ
11 Analog Signal Ground Analog signal ground for control and monitoring
12 Enable Input Low = Enable, TTL, CMOS, open collector compliant
13 Digital Mode RS-232 or RS-485 configuration
Low = RS-485, Open circuit = RS-232
14 RS-232 TxD/RS-485 (-) Transmit data (output) wrt pin 1 or RS-485 inverting
15 RS-232 RxD/RS-485 (+) Receive data (input) wrt pin 1 or RS-485 non inverting

Digital Control – Connect pin 5 to pin 10
Analog Control – Connect pin 5 to pin 6


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