The VLA4 combines Varedan’s high performance class AB linear analog ultra-low drift output stage with our new digital control platform. Feedback options include standard incremental quadrature to modern absolute digital systems such as BiSS and EnDat.
The PC based VaredanGUI™, with it’s built in command stimulus and real time oscilloscope signal tracer views, reduces the requirements for external equipment while setting up new systems. The standard Ethernet based communications easily connects with all modern computers. Full system configuration can be saved and uploaded for quick and easy drive provisioning.
In current mode the amplifier is commutated by an external controller. Our Linear Amplifier Series are designed to drive single & 3-phase loads by analog input commands.
These current mode linear amplifiers are available in the following standard configurations:
“T-Mode” – Three-phase current output. This configuration is used for driving three phase rotary or linear motors with a full-bridge output configuration. In this configuration the amplifier receives two sinusoidal current commands for phases A and B (ABSine). The phase C command is generated internally in the amplifier.
“S-Mode” – Single-phase H-Bridge type output. This configuration is used for driving single phase loads such as brush-type motors or voice coils. In this mode the amplifier can deliver the full rail-to-rail bipolar bus voltage to the load.
The following is an example of S-Mode operation. When operating in full-bridge configuration (Phase to Phase), the maximum bus voltage that can be applied to the voice coil is the full B+ to B- voltage. For example if you are using a +/-50VDC bus and a full-bridge connected voice coil, the maximum voltage that can be applied to the voice coil is +100V or -100V. This is illustrated in the following picture which shows positive current from PhaseB to PhaseC (+100V):
“D-Mode” – Dual independent Half-Bridge type outputs. This mode is used to drive two independent single phase loads, such as brush-type motors or voice coils, with one amplifier module. In this mode the amplifier can deliver half of the full rail-to-rail bipolar bus voltage to the load. The sum total wattage requirements of the two independent loads must be within the capabilities of the amplifier module.
The following is an example of D-Mode operation, (or one or two voice coil connected to a T-Mode amplifier). When operating in Half-Bridge configuration (Phase to Common), the maximum bus voltage that can be applied to the voice coil is 1/2 of the full +/-Bus supply. For example if you are using a +/-50VDC bus and a half-bridge connected voice coil, the maximum voltage that can be applied to the voice coil is +50V or -50V. This is illustrated in the following picture which shows positive current from phaseB to Common (+50V):
The VLA4 can be configured and tuned through an easy to use PC based VaredanGUI™. The VLA4 supports:
| Amplifier Series | Current Continuous/Peak | Power Continuous/Peak | ± VDC Bus Voltage | Dimensions | Weight |
|---|---|---|---|---|---|
| VLA4-210 | 2.5/10A | 200/400W | ±12 - ±150VDC | 7.50” x 8.00” x 2.612” | 3.60 Pounds |
| VLA4-415 | 5/15A | 400/1800W | ±12 - ±150VDC | 7.50” x 8.00” x 2.612” | 3.60 Pounds |
| VLA4-525 | 15/25A | 500/1900W | ±12 - ±150VDC | 7.50” x 8.00” x 2.612” | 4.60 Pounds |
| VLA4-540 | 15/40A | 500/3800W | ±12 - ±150VDC | 7.50” x 8.00” x 2.612” | 4.60 Pounds |
| VLA4-825 | 15/25A | 800/1900W | ±12 - ±150VDC | 7.50” x 8.00” x 3.871” | 7.80 Pounds |
| VLA4-840 | 15/40A | 800/3800W | ±12 - ±150VDC | 7.50” x 8.00” x 3.871” | 7.80 Pounds |
| VLA4-1525 | 15/25A | 1500/1900W | ±12 - ±150VDC | 7.50” x 8.00” x 4.871” | 9.80 Pounds |
| VLA4-1540 | 15/40A | 1500/3800W | ±12 - ±150VDC | 7.50” x 8.00” x 4.871” | 9.80 Pounds |
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