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DC Servo

Overview

DC servo systems provide responsive feedback and accurate positioning, essential for industrial automation, robotics, and other applications. This DC servo platform offers optimized motor control and can interface with common industrial networks and protocols such as EtherCAT®. Advanced motor control algorithms are executed by the motor control MCU to manage power switching and drive components, while integrated motor feedback enables precise position sensing for accurate performance.

System Benefits:

  • Optimized and highly integrated system in a compact form factor, ideal for robot joints with servo motor control and dual encoders
  • Reliable EtherCAT communication and advanced motor control algorithms
  • Flexible, cost-effective position sensor for encoder with up to 15-bit accuracy and immunity to magnetic stray fields

Block Diagram

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CN032-9: WEBConnector Arrow.28Line.339Line Arrow.223Battery.27Sheet.3Sheet.4Sheet.5Line ArrowConnector Arrow48V48V48VBattery PackBattery PackBattery Pack12V12V12VConnector Arrow.145V5V5VLine Arrow.163.3V3.3V3.3VVertical Wire Bundle333Sheet.31Vertical Wire Bundle.180666Sheet.182Connected signals arrow.218Motor-DCSheet.220MMMSheet.222Vertical Wire Bundle.224333Sheet.226Line Arrow.230Vertical Wire Bundle.231333Sheet.233Connector 2GroundSheet.69Sheet.70ShuntSheet.74Sheet.75Sheet.76Line Arrow.228Connector 1.160Ground.257Sheet.258Sheet.259Shunt.261Sheet.262Sheet.263Sheet.264Line Arrow.266Connector 1.268Ground.271Sheet.272Sheet.273Shunt.275Sheet.276Sheet.277Sheet.278Line Arrow.280Connector 1.282Vertical Wire Bundle.286333Sheet.288Bus VoltageBus VoltageBus VoltageLine Arrow.291Temperature SensorTemperature SensorTemperature SensorLine Arrow.294Connector Arrow.296Connector Arrow.298Dual componentComponent block.631Position SensorPosition SensorPosition SensorRS-485RS-485RS-485Bi-directionalLine Bi-directionalLine Bi-directional.310Encoder Board x2Encoder Board x2Encoder Board x2Connector Arrow.312WS298WS298WS298CAN TransceiverCAN TransceiverCAN TransceiverCAN I/FCAN I/FCAN I/FBi-directional.316Bi-directional.317100M PHY100M PHY100M PHYBi-directional.319Bi-directional.321Diode - LEDSheet.327Sheet.328Sheet.329Sheet.330Sheet.331Darlington.651Sheet.333Darlington.254Ground.335Sheet.336Sheet.337Line.338Line.340Sheet.341Component block.631RJ45RJ45RJ45Buck RegulatorBuck RegulatorBuck RegulatorDC/DCDC/DCDC/DCLDOLDOLDOSheet.342Component block.745Component block.631Half-Bridge FET DriversHalf-Bridge FET DriversHalf-Bridge FET DriversSheet.343Component block.78Component block.79Operational AmplifierOperational AmplifierOperational AmplifierLine Arrow.234Connected signals arrowLine Arrow.179Sheet.344Encoder ControlEncoder ControlEncoder ControlUARTUARTUARTSPISPISPISheet.345Motor Control MCUMotor Control MCUMotor Control MCUPWMPWMPWMEtherCATEtherCATEtherCATCANCANCANGPIOGPIOGPIOADCADCADCADCADCADCADCADCADCUARTUARTUARTSheet.349Power FETsPower FETsPower FETsN-Channel Depletion MOSFETSheet.33Sheet.34Sheet.35Sheet.36Sheet.37Sheet.38Sheet.39Sheet.40Sheet.41Sheet.42Sheet.43Sheet.44Connect.50Sheet.46Sheet.47Sheet.48N-Channel Depletion MOSFET.49Sheet.50Sheet.51Sheet.52Sheet.53Sheet.54Sheet.55Sheet.56Sheet.57Sheet.58Sheet.59Sheet.60Sheet.61Connect.50Sheet.63Sheet.64Sheet.65Line.66N-Channel Depletion MOSFET.100Sheet.101Sheet.102Sheet.103Sheet.104Sheet.105Sheet.106Sheet.107Sheet.108Sheet.109Sheet.110Sheet.111Sheet.112Connect.50Sheet.114Sheet.115Sheet.116N-Channel Depletion MOSFET.117Sheet.118Sheet.119Sheet.120Sheet.121Sheet.122Sheet.123Sheet.124Sheet.125Sheet.126Sheet.127Sheet.128Sheet.129Connect.50Sheet.131Sheet.132Sheet.133Line.134N-Channel Depletion MOSFET.140Sheet.141Sheet.142Sheet.143Sheet.144Sheet.145Sheet.146Sheet.147Sheet.148Sheet.149Sheet.150Sheet.151Sheet.152Connect.50Sheet.154Sheet.155Sheet.156N-Channel Depletion MOSFET.157Sheet.158Sheet.159Sheet.160Sheet.161Sheet.162Sheet.163Sheet.164Sheet.165Sheet.166Sheet.167Sheet.168Sheet.169Connect.50Sheet.171Sheet.172Sheet.173Line.174Line.227Line.279Line.265

Buck Regulator

Buck Regulators (Integrated FETs)

DC/DC

Buck Regulators (Integrated FETs)

LDO

Linear Regulators (LDO)

Motor Control MCU

Enable high‑performance, real-time motor control for high-speed operation, with a wide range of connection interfaces for flexible integration into other systems and applications.
RA Arm Cortex-M MCUs
RA Arm Cortex-M MCUs
White Paper

Half-Bridge FET Drivers

Ensure thermal efficiency with tight control loops, reduced torque ripple, and instant servo response, supported by high-frequency half-bridge drivers for smooth motor operation and built-in protections for system reliability.
Half-Bridge FET Drivers
Half-Bridge FET Drivers

Power FETs

Ultra-compact, high-efficiency FETs, ideal for high-power and high-frequency switching in DC servo applications.
Power MOSFETs

Operational Amplifier

General-purpose Op Amps

Encoder Control

RA Arm Cortex-M MCUs

Position Sensor

Inductive Position Sensors
Inductive Position Sensors
Application Note

RS-485

RS-485/422, RS-232, & Multi-protocol Transceivers

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