IXYS PVM-4150 Datasheet
THE PULSE OF THE FUTURE
DIRECTED
ENERGY
INCORPORATED
PVM-4150 ± 1500V PULSE
GENERATOR MODULE
• 0 to ±1500V Pulse Output
• <25ns Rise And Fall Times
• <60ns to DC Pulse Width
• >75KHz Pulse Repetition Frequency
• Optimized To Drive Deflection
Plates, Grids And Other Capacitive
Loads
• Protected Against Arcs, Shorts And
Load Transients
• Economical, Modular Solid State
Design
The PVM-4150 is a compact, OEM-style pulse generator
module producing fast, high voltage wave forms to
1,500V. Optimized for driving high impedance capacitive
loads, the PVM-4150 is well suited for driving extraction
grids and deflection plates for electros tatic modulation of
particle beams in time-of-flight mass spectrometers and
accelerators. Its robust and versatile design also m akes 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-4150 will optimize the
performance of any system in which it is used.
The PVM-4150 will generate an output voltage pulse of
1500 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 +1500V
or from ground to -1500V, and can also generate pulses
originating from a DC voltage offset from ground by using
both VLow and VHigh power supply inputs.
The PVM-4150 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.
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-4150 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 cable.
Unlike some competing solid state switches, the PVM-4150 incorporates all control and protection logic circuitry, energy storage and output network. It can be connected directly to the
load, and does not require series or shunt resistors, impedancematching networks between the pulser and the load, or additional energy storage (capacitor banks). All of this is taken care
of within the PVM-4150. 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-4150 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-4150 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 compac tness and durability are not all you get in the PVM-4150. Inherent in the design is exceptional pulse fidelity with virt ually 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.
An IXYS Company
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:
±1500 Volts (V
High
- V
Low
)
Minimum Value: 0 Volts
Means Of Adjustment: Controlled By Power Supply Input Voltages
Pulse Rise And Fall Time: <25ns, typically <20ns (10% to 90%)
Pulse Width: <60ns (typically 50ns) to DC, Controlled by Input Gate
Pulse Recurrence
Frequency (PRF):
Single shot to 75KHz at 1500V output,
1MHz 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 114ns Typical
Jitter: <1ns shot -to-shot
Output Connector: SHV, End Panel
Output Cable: RG-62 (93Ω) Coaxial Cable, 2 feet (~61cm) long
INPUT DC VOLTAGE +VIN (V
High
)
Absolute Max. Value: +1500 Volts
Absolute Min. Value: -1500 Volts
Relative Max. Value:
+1500 Volts over V
Low
Voltage
Relative Min. Value:
+0V Over V
Low
Voltage
Input Connector: SHV, End Panel
INPUT DC VOLTAGE -VIN (V
Low
)
Absolute Max. Value: +1500 Volts
Absolute Min. Value: -1500 Volts
Input Connector: SHV, End Panel
GATE
Gate Source: External
Gate Input: TTL into 50Ω
Connector: BNC, End Panel
GENERAL
Support Power: +24VDC To +28VDC @ 250mA Max Operating Cur-
rent, 1A Starting (inrush) current
Dimensions (Excluding Co nnectors):
6” W x 12” L x 2” H (152mm W x 305mm L x 51mm H)
Weight (Approximate): 40 Ounces (1.13 Kilograms)
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
These specifications are measured driving a 50pF load connected with 2 feet of RG-62 cable, at
1500V output. However the PVM-4150 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 1500V, the PVM-4150 can operate at continuous pulse
recurrence frequencies up to 1MHz. The PVM-4150 can also drive resistive or inductive loads,
within limitations. Contact DEI for additional information and applications assistance.
(1)
The power dissipated in the PVM-4150 when driving a capacitive load is defined by the formula CV2F, where C is the total load capacitance, including the capacitance of the load, interconnect cable, and the internal capacitance of the PVM-4150, V is the pulse voltage, and F is
the pulse repetition frequency (or the total pulses per second). (For these calculations, the internal capacitance of the PVM-4150 is 200pF, and RG-62 cable is 13pf/foot.) Given the maximum
dissipation of 50W, the maximum load capacitance, frequency and/or voltage at which the PVM4150 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.
50ns Minimum Pulse Width, 1500V Output
(25ns/Div horizontal scale, 250V/Div vertical scale)
<19ns Rise Time, 1500V Output
(25ns/Div horizontal scale, 250V/Div vertical scale)
>75KHz Frequency, 1500V Output
(5µs/Div horizontal scale, 250V/Div vertical scale)
Typical Output Waveform, 1500V
(1µs/Div horizontal scale, 250V/Div vertical scale)
9200-0217 Rev 1
© Directed Energy, Inc. 2000
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