IXYS PVX-4150 Datasheet
THE PULSE OF THE FUTURE
DIRECTED
ENERGY
INCORPORATED
PVX-4150
±1,500V PULSE GENERATOR
• 0 to ±1500V Pulse Output
• <25nsRiseAndFallTimes
• <60ns to DC Pulse Width
• >240KHz Pulse Repetition Frequency
• OptimizedToDriveDeflectionPlates,
Grids And Other Capacitive Loads
• Protected Against Arcs, Shorts And
Load Transients
• Voltage And Current Monitor Outputs
The PVX-4150 pulse generator produces fast, high voltage
wave forms to 1,500V. Optimized for high impedance capacitive loads, the PVX-4150 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 PVX-4150 will
optimize the performance of any system in which it is used.
The PVX-4150 generates an output voltage pulse of 1,500
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. This offset can
be from –1500V to +1500V, with a maximum power supply
voltage differential of ≤1500V.
The PVX-4150 requires 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.
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-4150 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-4150 features front panel indicator LEDs to monitor the status of the pulse generator. Front panel 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 oscilloscope 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-4150. 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-4150.
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 6 feet (~1.8M) of RG-62 (93Ω) coaxial cable)
OUTPUT
Maximum Value:
±1500 Volts (V
High-VLow
)
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 to DC, Controlled by Input Gate
Pulse Recurrence Frequency
(PRF):
Single shot to 240KHz at 1500V continuous output,
maximum limited by power dissipation
(1)
,5MHzBurst,
Controlled by Input Gate
Max. Average Power:
150W (V
High+VLow
), derated at 2W/°C over 25°C am-
bient
(1)
Max. Duty Cycle: Continuous
Droop: <1%
Over/undershoot: <5%
Throughput Delay 120ns Typical
Jitter: <1ns shot-to-shot
Output Connector & Cable:
SHV, With 6 feet (~1.8M) RG-62 (93Ω) Coaxial Cable
INPUT DC VOLTAGE +V
IN(VHigh
)
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 DC VOLTAGE -V
IN(VLow
)
Absolute Max. Value: +1500 Volts
Absolute Min. Value: -1500 Volts
Input DC Connectors:
SHV, Rear Panel (One each for +V
IN
and -VIN)
GATE
Gate Source & Connector
TTL into 50Ω, into BNC connector on the front 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)
SPECIFICATIONSSUBJECT TO CHANGE WITHOUT NOTICE
These specifications are measured driving a 50pF load connected with 6 feet of RG-62 cable,
at 1500V output. However the PVX-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 PVX-4150 can operate at continuous pulse
recurrence frequencies above 240KHz. The PVX-4150 can also drive resistive or inductive
loads, within limitations. Contact DEI for additional information and applications assistance.
(1)
The power dissipated in the PVX-4150 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-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 PVX-4150 is 200pF, and RG-62 cable is 13pf/foot.) Given the maximum
dissipation of 150W, the maximum load capacitance, frequency and/or voltage at which the
PVX-4150 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.
18ns Rise & Fall Times, 1500V Output
(10ns/Div horizontal scale, 300V/Div vertical scale)
244KHz Frequency, 1500V Output
(2.5µs/Div horizontal scale, 300V/Div vertical scale)
Doc #9200-0209 Rev 2
© Directed Energy, Inc. 2000
<60ns Minimum Pulse Width, 1500V Output
(25ns/Div horizontal scale, 300V/Div vertical scale)
Typical Output Waveform, 1500V
(1µs/Div horizontal scale, 300V/Div vertical scale)
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