Other Switching Amplifiers

These compact, switching amplifier PWBs have been designed for high efficiency and versatility and can be adapted to a wide variety of applications. The Output PWBs are either a full bridge or half bridge (usually used in pairs). The outputs are fully protected against open, shorted, or reactive loads of zero power factor.

Some PWBs include a transformer suitable for high frequency applications; most are directly coupled, and require external DC blocking capacitors and an output transformer. Several Output PWBs may be combined for higher output by putting equal voltage transformer secondaries in series. Contact the factory concerning your specific needs.

OUT-18 - This compact board is appropriate for multi channel, high power, low duty cycle applications. Packaged as an S18-26 in a submarine compatible enclosure, it was used in an upgrade to a US Navy sonar system.

OUT-26 - The S26-2A module is a 1,500 VA rated assembly and contains an analog pre-amplifier, PWM modulator, 2 output PWBs, and output filter. This module is 7 x 10 x 5 inches without heat sink. This assembly requires external heat sinking. An adequate heat sink for air cooling may be attached to the top of the standard module. The S26-2 is an S26-2A module packaged in an 8.75 inch high rack mounting enclosure and is delivered ready to use, including the DC supply and output transformer.

OUT-27 - This very narrow PWB is 3.5 inches wide and includes a preamp and PWM modulator. It operates from a 48V supply. It is cooled by making contact to one edge.

OUT-38 - This 1,000 VA amplifier is just 6 x 15 inches and includes an analog Preamp, PWM modulator, four quadrant bridge amplifier, some output filtering, and an A/B switch to redirect the output to two different loads. It is conductively cooled with an expanding card-lock along one 15 inch edge. This unit is especially suitable for under water applications utilizing conductive cooling to the enclosure.

OUT-40 - This 1,500 VA amplifier PWB is 4.5 x 14 inches and includes an analog Preamp, PWM modulator, four quadrant bridge amplifier, and an output filter. A special 2 channel chassis has been developed which has a small power supply for operation from a standard 115V outlet and 2 OUT-40 PWBs. Click here to see the S40-2. 

Load power factor range

    0 - 100% capacitive or inductive

Protection

    No combination of passive loads or input signals, including
    overdrive, short or open will cause amplifier failure.

Ambient temperature

    0 - 40 degrees C

PWM units only

Distortion (THD)

    below 20 kHz: 2% max, 0.2% typical

RMS noise (re max output)

    -60 dB gated on -120 dB gated off

Input impedance (analog)

    5 k ohm

Input voltage for full output

    1 V RMS for full output

Model

OUT-18

OUT-26

OUT-27

OUT-38

OUT-40

Output VA

2,500

750

600

1,000

1,500

Max duty cycle

1%

100%

100%

20%

100%

Bridge configuration

Full

Half

Full

Full

Full

Heat sinking

none

Clamp

Clamp

Clamp

Air

Max frequency kHz

50 PWM

    260

85 PWM

85 PWM

85 PWM

Input signal

Analog
1VRMS

Digital
TTL

Analog
1VRMS

Analog
1VRMS

Analog
1VRMS

Connection Method

96 DIN

96 DIN

DB-25

Double
Ended
Plugs

35 EDAC

Width

6.0

4.5

3.0

6.0

4.5

Length

12.0

8.3

15.75

13.0

14.0

Thickness

2.5

1.2

1.0

0.8

1.3

Main DC Supply needed

250

48-59

48-59

250

250

Aux Dc supply needed

+12

12

+12

+12

+12

Amplifier Photograph

OUT-18

OUT-26

OUT-27

OUT-38

OUT-40

Model

S18-26

S26-2A

S26-2

18 Channels

Module

Rack Mount

Input power needed

440 V 3ph

48-59 VDC

115*/230 VAC

Input Signal

Analog

Analog

Analog

Frequency Range (-3 dB)

10-35 kHz

50 Hz - 30 kHz

50 Hz - 30 kHz

Modulation

PWM

PWM

PWM

Output VA

2,500 VA/chan

1,500

1,500

Output Watts

10 mSec

1,500

1,200

Max duty cycle

1%

100%

100%

Size (inches)

18 x18x 60

7 x 10 x 5

8.75 high

Weight (pounds)

700

15

65

Amplifier Photograph

S18-26

S26-2A

S26-2

© 2011 Instruments, Inc. - All Rights Reserved