IXYS PVX-4140 Datasheet
THE PULSE OF THE FUTURE
DIRECTED
ENERGY
INCORPORATED
PVX-4140
±3,500V PULSE GENERATOR
• 0 to ±3500V Pulse Output
•≤≤≤≤25ns Rise And Fall Times
•≤≤≤≤60ns to DC Pulse Width
• >30KHz 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
The PVX-4140 pulse generator produces fast, high voltage wave forms to 3,500V. Optimized for high impedance
capacitive loads, the PVX-4140 is well suited for driving
extraction grids and deflect ion plat es for electros tat ic
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 PVX-4140
will optimize the performance of any system in which it is
used.
The PVX-4140 generates an output voltage pulse of 3,500
volts with rise and fall times of 25ns or less, with very flat
voltage pulses to DC into a capacitive load. It can generate singled-ended output pulses from ground to +3500V or
from ground to –3500V, and can also generate pulses
originating from a DC voltage offset from ground by using
both VLow and VHigh power supply inputs. This offset can
be from –3500V to +3500V, with a maximum power supply
voltage differential of ≤3500V.
The PVX-4140 requires a user-supplied TTL gate signal, a
high voltage DC power supply and optional DC offset supply inputs. The output pulse width and frequenc y are controlled by the gate signal. The pulse output voltage is controlled by the amplitude of the input DC power supplies.
When the input gate is high, the V
HIGH
supply is connected
to the output. When the input gate is low, the V
LOW
supply
is connected to the output. Therefore the PVX-4140 can be
used to generate a negative-going pulse by logically
inverting the input gate, so that the input gate is high until
the unit is pulsed. When the input gate goes low, the V
LOW
input supply is connected to the output, thereby generating
a negative-going pulse.
The PVX-4140 features front panel indicator LEDs to monitor the status of the pulse generator. Front panel instrument-quality voltage and current monitors provide a
straightforward means to view the output voltage and current waveforms in real-time, eliminating the need for an external high voltage oscillos c ope probe .
The pulse generator is a direct-coupled, air-cooled solidstate 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. It 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. All control and protection logic
circuitry, support power, energy storage and output network
are incorporated into the PVX-4140. It can be connected
directly to the load, and does not require series or shunt
resistors, impedance-matching networks between the
pulser and the load, or additional energy storage (capacitor
banks). All of this is taken care of within the PVX-4140.
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 6 feet (~1.8M) of RG-59 (75Ω) coaxial cable)
Doc #9200-0213 Rev 5
© Directed Energy, Inc. 2000
OUTPUT
Maximum Value:
±3500 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 to DC, Controlled by Input Gate
Pulse Recurrence
Frequency (PRF):
Single shot to 30KHz at 3500V continuous output,
maximum limited by power dissipation
(1)
, 5MHz Burst,
Controlled by Input Gate
Max. Average Power:
100W (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 6 feet (~1.8M) RG-59 (75Ω) Coaxial Cable
INPUT DC VOLTAGE +V
IN
(V
High
)
Absolute Max. Value: +3500 Volts
Absolute Min. Value: -3500 Volts
Relative Max. Value:
+3500 Volts over V
Low
Voltage
Relative Min. Value:
+0V Over V
Low
Voltage
INPUT DC VOLTAGE -V
IN
(V
Low
)
Absolute Max. Value: +3500 Volts
Absolute Min. Value: -3500 Volts
Input DC Connectors:
SHV, Rear 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: 90VAC to 240VAC, 50/60Hz
Dimensions (Excluding Con-
nectors):
19” W x 5.2” H x 13” D (48.25cm W x 13.2cm H x 33cm
D)
Weight (Approximate): 18 lbs. (8.2 Kilograms)
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
GATE
These specifications are measured driving a 50pF load connected with 6 feet of RG-59 cable, at
3500V output. However the PVX-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 3500V, the PVX-4140 can operate at continuous pulse
recurrence frequencies up to 400KHz. The PVX-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 PVX-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 PVX-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 PVX-4140 is 120pF, and RG-59 cable is 21.5pf/foot.) Given the maximum
dissipation of 100W, the maximum load capacitance, frequency and/or voltage at which the
PVX-4140 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.
>5MHz Burst Frequency, 3000V Output
(250ns/Div horizontal scale, 500V/ Div vertical scale)
60ns Minimum Pulse Width, 3500V Output
(25ns/Div horizontal scale, 500V/Div vert ical scale)
25ns Rise & Fall Times, 3500V Output
(50ns/Div horizontal scale, 500V/Div vert ical scale)
Typical Output Waveform, 3500V
(100µs/Div horizontal scale, 500V/ Div vertical scale)
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