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      • LA 100 Series Analog Linear Servo Amplifiers
      • LA-300 Analog Linear Servo Amplifier
      • LA-200/400/500 Series Linear Amplifiers
      • LA-800/1500 Series Linear Amplifiers
      • LALD-400/500/800/1500 Series Low Drift Linear Amplifiers
      • 3U Eurocard Modules/Rackmount Systems
      • 6U Eurocard Modules/Rackmount Systems
    • Intelligent Linear Servo Amplifiers
      • LAD-300S Series Intelligent Linear Servo Amplifiers
      • VLA4 Series Intelligent Linear Amplifiers
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      • VSA1 / VSA2 Series Digital PWM Servo Amplifiers
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info@varedan.com
Varedan TechnologiesVaredan Technologies
  • Home
  • Products
    • Analog Power OP Amps
      • 100 Volt Analog Power Op Amps
      • 150 Volt Analog Power Op Amps
      • 200 Volt Analog Power Op Amps
      • 300-350 Volt Analog Power Op Amps
      • 500-2000 Volt Analog Power Op Amps
      • Compact Analog Power Op Amps
      • Rail to Rail Analog Power Op Amps
    • Analog Linear Servo Amplifiers
      • LA 100 Series Analog Linear Servo Amplifiers
      • LA-300 Analog Linear Servo Amplifier
      • LA-200/400/500 Series Linear Amplifiers
      • LA-800/1500 Series Linear Amplifiers
      • LALD-400/500/800/1500 Series Low Drift Linear Amplifiers
      • 3U Eurocard Modules/Rackmount Systems
      • 6U Eurocard Modules/Rackmount Systems
    • Intelligent Linear Servo Amplifiers
      • LAD-300S Series Intelligent Linear Servo Amplifiers
      • VLA4 Series Intelligent Linear Amplifiers
      • VLTP Brushless Air Bearing Spindle Controller
    • Digital PWM Servo Amplifiers
      • VSA1 / VSA2 Series Digital PWM Servo Amplifiers
    • Power Supplies
      • VPS-LA-3KVA Stand Alone 3-Phase Linear Power Supply
      • Other DC Power Supplies
    • AC Step Down Transformers
  • Servo Amplifier Sizing & Tools
  • Company
  • News
  • Contact Us
    • FAQ / Support Center
    • Returns/Repairs

LA-800/1500 Series Linear Amplifiers

The LA Linear Servo Amplifier Series are the perfect choice for systems requiring low radiated noise and zero distortion. These high power linear amplifiers are well suited to drive loads such as brushless and brush servo motors or voice coils. Our designs incorporate class AB linear output stages for true linear output.

The design of these amplifiers includes an onboard high-speed DSP that monitors all key system functions in real time, and provides protection for the outputs by limiting output power to a “Safe Operating Area”. An intelligent user interface allows setup and storage of all system parameters via the serial interface. Non-volatile memory provides storage of the parameters during power off conditions.

Modes of Operation

Current Mode

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):

Linear Amplifier Sizing
S-Mode Operation

“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):

Internally Commutated Current Mode

Our optional VMC2* plug-in board can interface with the encoder to allow the amplifier full sinusoidal commutation.

Velocity Mode & Position Mode

Our optional VMC2* plug-in board can interface with your feedback device to provide velocity & position mode.

*Please contact Varedan for more information.

linear Amplifier Sizing
D-Mode Operation

Request Application Assistance

Tell us about your application so we can help you select the right solution.

Please use this fillable PDF form to guide you through the information about your application that we need to properly size and select an amplifier for your application.  Please also see out Amplifier Sizing & Tools page for sizing calculators, white papers and other tools.

Standard Models

Amplifier SeriesCurrent Continuous/Peak Power Continuous/Peak ±VDC Bus VoltageDimensionsWeight
LA-83015/30 Amps800/3000 Watts±12 - ±150VDC8.00" x 8.16" x 4.45"7.8 lbs.
LA-83518/35 Amps800/4500 Watts±12 - ±150VDC8.00” x 8.16” x 4.45”7.8 lbs.
LA-84020/40 Amps800/6000 Watts±12 - ±150VDC8.00” x 8.16” x 4.45”7.8 lbs.
LA-153520/35 Amps1500/3000 Watts±12 - ±150VDC8.00" x 8.16" x 5.85"9.8 lbs.
LA-154525/45 Amps1500/4500 Watts±12 - ±150VDC8.00" x 8.16" x 5.85"9.8 lbs.
LA-155530/55 Amps1500/6000 Watts±12 - ±150VDC8.00" x 8.16" x 5.85"9.8 lbs.

Key Design Benefits

  • True Rail to Rail Output
  • DSP Fault – Set when the internal DSP checksum fails following reset
  • NVM Fault – Set when NVM checksum fails following reset. Parameter defaults set
  • External +5V – Set when on board +5V supply for Halls is out of range
  • Autobalance Fault – Set when autobalance can’t balance amplifier outputs
  • ABS Overcurrent – Set when instantaneous overcurrent condition is detected
  • SOA – Set when Safe Operating Area protection detects an over power condition
  • 5 VDC Reference error – Set when internal +5 reference supply is out of range
  • Bus Over Voltage – Set when Bus voltage is greater than maximum allowed (75 VDC)
  • Hall Error – Set when hall sequence is invalid (0 or 7 value is read on hall inputs)
  • Fatal Error – Set if the DSP encounters an unidentified problem
  • Amplifier Over Temp – Set when amplifier heat sink temperature exceeds 70 C
  • Motor Over Temp – Set when motor temperature input is open
  • Over-current – Set when amplifier detects an overcurrent condition
  • Bus Under Voltage – Set when Bus voltage is less than the minimum allowed (10 Vdc)
  • Bias error – Set when Bias voltage input +/-15 is outside allowable range
  • 5V Reference error – Set when internal 2.5V supply is out of range
  • Factory or Customer Programable Options:
    • RMS Over-current Trip Level
    • RMS Over-current Trip Time
    • Absolute Over-current Trip Level
    • Enable level
    • Enable Source
    • Fault level

Models & Specifications

  • LA-800 Series Amplifiers
  • LA-1500 Series Amplifiers
Package Type DatasheetInstallation DrawingManualSTEP File
Amplifier Module - For high density or OEM applications. Available without covers.
Stand-Alone Amplifier Package - For "plug & play" applications. Available in a fully enclosed package with built in fan and power supply.
Single Axis Package (needs external isolation transformer) - Mounted on a baseplate with built in fan.Contact Varedan
Contact Varedan
2 Axis Package (needs external isolation transformer) - Mounted on a baseplate with built in fan.Contact Varedan
Contact Varedan

Package Type DatasheetInstallation DrawingManualSTEP File
Amplifier Module - For high density or OEM applications. Available without covers.
Single Axis Package (needs external isolation transformer) - Mounted on a baseplate with built in fan.Contact Varedan
Contact Varedan
2 Axis Package (needs external isolation transformer) - Mounted on a baseplate with built in fan.Contact Varedan
Contact Varedan

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  • Varedan Technologies
  • 3860 Del Amo Blvd., Suite 401 Torrance, CA 90503
  • 310.542.2320
  • 310.542.2344
  • info@varedan.com
  • varedan

© 2022 · Varedan Technologies

  • Home
  • Products
    • Analog Power OP Amps
      • 100 Volt Analog Power Op Amps
      • 150 Volt Analog Power Op Amps
      • 200 Volt Analog Power Op Amps
      • 300-350 Volt Analog Power Op Amps
      • 500-2000 Volt Analog Power Op Amps
      • Compact Analog Power Op Amps
      • Rail to Rail Analog Power Op Amps
    • Analog Linear Servo Amplifiers
      • LA 100 Series Analog Linear Servo Amplifiers
      • LA-300 Analog Linear Servo Amplifier
      • LA-200/400/500 Series Linear Amplifiers
      • LA-800/1500 Series Linear Amplifiers
      • LALD-400/500/800/1500 Series Low Drift Linear Amplifiers
      • 3U Eurocard Modules/Rackmount Systems
      • 6U Eurocard Modules/Rackmount Systems
    • Intelligent Linear Servo Amplifiers
      • LAD-300S Series Intelligent Linear Servo Amplifiers
      • VLA4 Series Intelligent Linear Amplifiers
      • VLTP Brushless Air Bearing Spindle Controller
    • Digital PWM Servo Amplifiers
      • VSA1 / VSA2 Series Digital PWM Servo Amplifiers
    • Power Supplies
      • VPS-LA-3KVA Stand Alone 3-Phase Linear Power Supply
      • Other DC Power Supplies
    • AC Step Down Transformers
  • Servo Amplifier Sizing & Tools
  • Company
  • News
  • Contact Us
    • FAQ / Support Center
    • Returns/Repairs