IXYS PVM-4140 Datasheet
THE PULSE OF THE FUTURE
DIRECTED
ENERGY
INCORPORATED
PVM-4140 ±3000V PULSE
GENERATOR MODULE
• 0 to ±3000V Pulse Output
• <25ns Rise And Fall Times
• <60ns to DC Pulse Width
• >25KHz Pulse Repetition Frequency
• Optimized To Drive Deflection
Plates, Grids, Pockels Cells And
Other Capacitive Loads
• Protected Against Arcs, Shorts And
Load Transients
• Voltage And Current Monitor
Outputs
• Economical, Modular Solid State
Design
The PVM-4140 is a compact, OEM-style pulse generator
module producing fast, high voltage wave forms to
3,000V. Optimized for high impedance capacitive loads,
the PVM-4140 is well suited for driving extraction grids
and deflection plates for electrostatic modulation of particle beams in time-of-flight mass spectrometers and accelerators. Its robust and versatile design also makes it well
suited for pulsing or gating power tube grids, Pockels cells
and Q Switches, acoustic transducers, microchannel
plates, photomultiplier tubes and image intensifiers. The
exceptional pulse fidelity of the PVM-4140 will optimize the
performance of any system in which it is used.
The PVM-4140 generates an output voltage pulse of 3,000
volts with rise and fall times less than 25ns, with very flat
voltage pulses to DC into a capacitive load. It can generate singled-ended output pulses from ground to +3000V or
from ground to –3000V, and can also generate pulses
originating from a DC voltage offset from ground by using
both VLow and VHigh power supply inputs.
The PVM-4140 requires user-supplied +24VDC to
+28VDC support power, a TTL gate signal, a high voltage
DC power supply and optional DC offset supply inputs.
The output pulse width and frequency are controlled by
the gate signal. The pulse output voltage is controlled by
the amplitude of the input DC power supplies.
Scaled internal voltage and current monitors provide a
straightforward means to view the output voltage and current waveforms in real-time.
The pulser is a half-bridge (totem pole) design, offering
equally fast pulse rise and fall times, low power dissipation, and virtually no over-shoot, under-shoot or ringing.
The PVM-4140 has over-current detection and shut-down
circuitry to protect the pulse generator from potential damage due to arcs and shorts in the load or interconnect c able.
Unlike some competing solid state switches, the PVM-4140 incorporates all control and protection logic circuitry, energy storage and output network. It can be connected directly to the
load, and does not req uire serie s or shunt r esistor s, i mpedan cematching networks between the pulser and the load, or additional energy storage (capacitor banks). All of this is taken care
of within the PVM-4140. The pulser is housed in an aluminum
enclosure, with threaded mounting holes in the base to simplify
installation and assembly in OEM applications.
The PVM-4140 pulser is a direct-coupled, all solid-state design using air as the primary insulating medium. Its conservative design margin gives you long component life. And
keeping the PVM-4140 free of potting compound or encapsulation materials makes it easy to service if a component
ever does require replacement. Some competing products
are potted, and must be replaced if they fail. But compactness and durability are not all you get in the PVM-4140. Inherent in the design is exceptiona l puls e fide l it y with virtually no ringing, over-shoot or under-shoot, high average
power handling capability, and protection against arcs ,
shorts and load transients in a reliable, economical module.
THE PULSE OF THE FUTURE
Directed Energy, Inc.
2401 Research Blvd., Suite 108
Fort Collins, CO USA 80526
970-493-1901 Fax: 970-493-1903
Email: deiinfo@directedenergy.com
Web: http://www.directedenergy.com
SPECIFICATIONS
(All specifications measured into a 50pF load connected with 2 feet (~0.6m) of RG-62 (93Ω) coaxial cable)
OUTPUT
Maximum Value:
±3000 Volts (V
High
- V
Low
)
Minimum Value: 0 Volts
Means Of Adjustment: Controlled By Power Supply Input Voltages
Pulse Rise And Fall Time: <25ns (10% to 90%)
Pulse Width: <60ns (typically 55ns) to DC, Controlled by Input Gate
Pulse Recurrence
Frequency (PRF):
Single shot to >25KHz at 3000V continuous output,
maximum limited by power dissipation
(1)
, 5MHz Burst,
Controlled by Input Gate
Max. Average Power:
50W (V
High
+ V
Low
)
(1)
Max. Duty Cycle: Continuous
Droop: <1%
Over/undershoot: <5%
Throughput Delay 120ns Typical
Jitter: <200ps shot-to-shot
Output Connector & Cable:
SHV, With 2 feet (~61cm) RG-62 (93Ω) Coaxial Cable
INPUT DC VOLTAGE +V
IN
(V
High
)
Absolute Max. Value: +3000 Volts
Absolute Min. Value: -3000 Volts
Relative Max. Value:
+3000 Volts over V
Low
Voltage
Relative Min. Value:
+0V Over V
Low
Voltage
INPUT DC VOLTAGE -V
IN
(V
Low
)
Absolute Max. Value: +3000 Volts
Absolute Min. Value: -3000 Volts
Input DC Connectors:
SHV, End Panel (One each for +V
IN
and -VIN)
Gate Source & Connector
TTL into 50Ω, into BNC connector on the end panel
VOLTAGE & CURRENT MONITORS
Voltage Monitor:
1000:1 into 1 MegΩ, BNC connector
Current Monitor:
10A/V into 50Ω, BNC connector
GENERAL
Support Power: +24VDC To +28VDC @ 250mA Max Operating Cur-
rent, 1A Starting (inrush) current
Dimensions (Excluding Connectors):
9.8” W x 10.2” L x 2” H (249mm W x 259mm L x 51mm
H)
Weight (Approximate): 56 Ounces (1.6 Kilograms)
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
GATE
These specifications are measured driving a 50pF load connected with 2 feet of RG-62 cable, at
3000V output. However the PVM-4140 can drive loads of a few picofarads to several hundred
picofarads of capacitance, limited by its maximum power dissipation capability
(1)
. At lower load
capacitances and/or voltages less then 3000V, the PVM-4140 can operate at continuous pulse
recurrence frequencies up to 400KHz. The PVM-4140 can also drive resistive or inductive loads,
within limitations. Contact DEI for additional informat i on and applications assistance.
(1)
The power dissipated in the PVM-4140 when driving a capacitive load is defined by the for-
mula CV
2
F, where C is the total load capacitance, including the capacitance of the load, interconnect cable, and the internal capacitance of the PVM-4140, V is the pulse voltage, and F is
the pulse repetition frequency (or the total pulses per second). (For these calculations, the i nternal capacitance of the PVM-4140 is 120pF, and RG-62 cable is 13pf/foot.) Given the maximum
dissipation of 50W, the maximum load capacitance, frequency and/or voltage at which the PVM4140 can operate can be approximated using this formula. This formula also approximates the
high voltage power supply requirements needed to drive a given load at a specific voltage and
frequency. This formula is not applicable when driving resistive or inductive loads.
<25ns Rise & Fall Times, 3000V Output
(50ns/Div horizontal scale, 500V/Div vert ical scale)
>5MHz Burst Frequency, 3000V Output
(250ns/Div horizontal scale, 500V/ Div vertical scale)
Doc #9200-0207 Rev 3
© Directed Energy, Inc. 2000
55ns Minimum Pulse Width, 3000V Output
(25ns/Div horizontal scale, 500V/Div vert ical scale)
Typical Output Waveform, 3000V
(100µs/Div horizontal scale, 500V/ Div vertical scale)
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