IXYS PVM-4210 Datasheet

THE PULSE OF THE FUTURE

DIRECTED

ENERGY
INCORPORATED

PVM-4210 DUAL OUTPUT HIGH
VOLTAGE PULSE GENERATOR MODULE

• Simultaneous Positive And Negative

0 To +950V and 0 To –950V Pulse
Outputs

• 1,900V Differential Output

• <15ns Rise And Fall Times

• <40ns to DC Pulse Width

• >20KHz Pulse Repetition Frequency

• Internal High Voltage Power Supplies

• Optimized To Drive Deflection Plates,

Pockels Cells, Q-Switches And Other
Capacitive Loads

• Economical, Modular Solid State

Design

The PVM -4210 is a compact, OEM-style pulse generator module
providing two simultaneous differential voltage pulses of up to
±950V (1,900V differential), with pulse rise and fall times <15
nanoseconds, and pulse widths continuously adjustable from
<40 nanoseconds to DC. The pulser operates on +24VDC to
+28VDC support power, and features integrated DC high voltage
power supplies.

The PVM-4210 is optimized for differential drive of deflection
plates for electrostatic modulation of particle beams in time-of­flight mass spectrometers and accelerators. It will also drive any
high impedance, capacitive load such as Pockels Cells and Q­Switches, electrodes, microchannel plates, acoustic transducers,
image intensifiers and photomultiplier tubes. The exceptional
pulse fidelity of the PVM-4210 will optimize the performance of
any system in which it is used.

The module provides two pulse output channels, controlled by a
common control logic. When the control logic receives a gate
signal, both channels pulse simultaneously. One channel pulses
from ground to the positive high voltage, and the other channel
pulses from ground to the negative high voltage. Therefore each
output can be connected to the electrodes of a Pockels Cell or
Q-Switch, or to a pair of deflecti on plates, providing a 1,900V
differential pulse across the cell or plates. These outputs may
also be inverted, to pulse from the high voltage potential to
ground. The width and frequency of the output pulses follow the
width and frequency of the TTL inpu t gate. The amplitude of the
output pulse voltage for each channel is independently adjust­able from 0 to 950V using screwdriver-adjustable potentiometers
readily accessible on the end panel of the pulser module.

The PVM-4210 requires +24VDC to +28VDC support power and
a TTL gate signal. For safety and control flexibility, a TTL level
signal is used to enable and disable the DC power supplies.

Each channel 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 unit has over-current
detection and shut -down circuitry to protect the pulse generator
against potential damage due to arcs and shorts in the load or
interconnect cables.

Unlike some competing solid state switches, the PVM -4210 is a com­plete pulser solution with high voltage power supplies, energy storage
and output network, ready for use. 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-4210. 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-4210 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-4210 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-

4210. Inherent in the design is exceptional pulse fidelity with virtu­ally no ringing, over-shoot or under-shoot, 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: [phone]
Email: [e-mail]
Web: http://www.directedenergy.com

OUTPUT PULSE ELECTRICAL CHARACTERISTICS (Specifications Apply To Both Output Channels)

Output Voltage 0 to +950V ±5V (Channel 1), 0 to –950V ±5V

(Channel 2)

Output Voltage Adjustments Screwdriver-adjustable potentiometers, End

Panel

Pulse Width <40ns to DC measured FWHM, controlled by

input gate

Pulse Rise And Fall Time ≤15ns, 10%-90%
Pulse Recurrence Frequency Single Shot to >20KHz continuous, 5MHz burst,

controlled by input gate

(1)

Pulse Droop <1%
Over/Undershoot <5%
Jitter <1ns Shot -to-Shot
Throughput Delay (Delay from leading edge of

input gate to leading edge of output pulse)

93ns typical

Maximum Duty Cycle Continuous
Maximum Average Power (Per Channel) 4W

(1)

Pulse Output Connectors SHV, End Panel
Output Cables 12” (~30cm) Belden 8218 75 Ω Coaxial Cable

GATE

Gate Source External
Gate Input TTL into 50Ω
Gate Rise Time <20ns
Gate Connector DSUB, End Panel

GENERAL

Support Power 24VDC to 28VDC @ 600mA Maximum Current
Dimensions (Excluding Connectors) 5.5”W x 11”L x 1.75”H (140mm W x 279.5mm L x

44.5mm H )

Weight (Approximate) 41 Ounces (1.16 kilograms)
Specifications subject to change without notice

SPECIFICATIONS

(All specifications measured into a 50pF load connected to each of the two outputs with 12” (~30cm) of Belden 8218 75Ω coaxial cable )

Min. Pulse Width: 38ns at 950V

10ns/Div horizontal scale, 200V/Div vertical scale

Typical Differential Output, ±950V

2.5µs/Div horizontal scale, 318V/Div vertical scale,

center horizontal trace is ground

20KHz Frequency, Both Channels

25µs/Div horizontal scale, 318V/Div vertical scale

Pulse Fall Time: 13ns at 950V

10ns/Div horizontal scale, 200V/Div vertical scale

5MHz Pulse Burst, 950V Output

250ns/Div horizontal scale, 200V/Div vertical scale

(1)

The power dissipated in each channel of the PVM-4210 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 -4210, 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-4210 is 125pF, and Belden 8218 cable is

21.5pf/foot.) Given the maximum power supply capability of 4W
(4mA) per channel, the maximum load capacitance, frequency and/
or voltage at which the PVM -4210 can operate can be approximated
using this formula. At lower load capacitances and/or voltages less
then 950V, the PVM-4210 can operate at continuous pulse
recurrence frequencies greater than 20KHz. This formula is not
applicable when driving non-capacitive (resistive or inductive) loads.
Contact DEI for information or assistance in using the PVM-4210
with different load characteristics or impedances.

9200-0204 Rev 3
© Directed Energy, Inc. 2000