Design & Integration File
Designed, Built, Tested
Board pictured here has been fully assembled and tested.

Overview

Design Resources

Design & Integration File

  • Schematic
  • PCB Layout
  • Bill of Materials
  • Allegro Layout Files
Download Design Files 23.3 MB

Description

ADPS30146-RD is a compact GaN-based servo drive solution designed for high-efficiency motor control in space-constrained applications. Integrating LT8418 gate drivers for half-bridge motor control and LT1999 in-line current sensing for precise torque regulation, it delivers reliable performance and high thermal efficiency. Supporting PWM frequencies from 25 kHz to 100 kHz with dead-time adjustment down to 10 ns, the design enables low-noise, highly efficient operation. Optional LC/LCL filtering provides smoother sine-wave outputs, while its controller- agnostic architecture supports a wide range of motor controllers and motor types from 50 W to 750 W, simplifying integration and reducing cooling requirements.

APPLICATIONS

  • Humanoid robot joints
  • Hollow shaft BLDC/servo motors
  • Industrial and automation servo drives
  • General BLDC, PMSM, and FOC-based motor applications

Features & Benefits

  • Compact GaN servo drive with integrated gate drive and sensing
  • Accurate current sensing improves torque regulation and dynamic response
  • Adjustable 25–100 kHz PWM with fine dead time control for low-noise efficiency
  • GaN efficiency removes need for external cooling
  • Small PCB footprint with optional LC/LCL filtering for clean output and motor integration
  • Compatible with multiple controllers, supporting 50–750 W across diverse motor types

Electrical Requirements:

  • Input Voltage: 48–58 V battery source
  • Output Voltage: 50–750 W
  • Board V1 Output: Conventional GaN switching waveform
  • Board V2 Output: Sine wave output generated through LC/LCL filtering

Control & Feedback Requirements:

  • PWM Frequency: 25–100 kHz
  • PWM Tuning Parameters: Switching frequency and dead time adjustment
  • Current Sensing Method: In-line sensing, two-phase measurement (U and W)
  • Scalability: Configurable sense resistor and amplifier gain

Mechanical Requirements:

  • PCB Size: 40 × 50 mm
  • Setup Variations: Extended cable connection between driver board and motor. Driver board mechanically integrated within the motor assembly
  • Thermal Constraints: Passive cooling only (no heatsink and no forced airflow)
  • Motor Load: MINAS A6 48 V, 400 W (MSMD04BL1S). Hollow shaft BLDC motors

Protection Requirements:

  • Provision for DC bus back EMF energy dissipation
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