Driven by the advancement of flexible manufacturing and Industry 4.0, intelligent adhesive dispensing collaborative robots have become key equipment for precise and efficient production. Their power supply and motion drive systems, serving as the "nerve center and muscles" of the entire unit, need to provide precise and highly dynamic power conversion for critical loads such as joint servo motors, end-effector heaters/valves, and sensor arrays. The selection of power MOSFETs directly determines the system's control precision, dynamic response, power density, and operational reliability. Addressing the stringent requirements of collaborative robots for safety, precision, compactness, and robustness, this article centers on scenario-based adaptation to reconstruct the power MOSFET selection logic, providing an optimized solution ready for direct implementation.
I. Core Selection Principles and Scenario Adaptation Logic
Core Selection Principles
1. Sufficient Voltage Margin: For motor drive bus voltages (24V/48V) and logic/sensor voltages (12V/5V), the MOSFET voltage rating must have a safety margin ≥50% to handle motor back-EMF, switching spikes, and power line disturbances.
2. Low Loss & Fast Switching Priority: Prioritize devices with low on-state resistance (Rds(on)) and low gate charge (Qg) to minimize conduction loss and enable high-frequency PWM for precise current control and high efficiency.
3. Package & Integration Matching: Select compact packages like DFN, SC70, SOT based on power level and highly integrated PCB space to maximize power density and facilitate heat dissipation in confined robot joints/body.
4. High Reliability & Ruggedness: Meet requirements for continuous operation in industrial environments, considering thermal cycling capability, vibration resistance, and built-in protection features.
Scenario Adaptation Logic
Based on the core load types within the collaborative robot, MOSFET applications are divided into three main scenarios: Joint Motor Drive (Motion Core), Auxiliary System Power Management (Functional Support), and End-Effector Control (Precision & Safety). Device parameters and characteristics are matched accordingly.
II. MOSFET Selection Solutions by Scenario
Scenario 1: Joint Motor Drive / Servo Amplifier (50W-200W) – Motion Core Device
Recommended Model: VBGQF1201M (Single-N, 200V, 10A, DFN8(3x3))
Key Parameter Advantages: Utilizes SGT technology, achieving an Rds(on) of 145mΩ at 10V drive. A 200V voltage rating provides ample margin for 24V/48V bus systems handling regenerative braking energy.
Scenario Adaptation Value: The compact DFN8 package offers excellent thermal performance in minimal space, crucial for integrated joint modules. High voltage capability ensures robustness against transients. Low conduction loss reduces inverter heat generation, enabling higher continuous torque output or smaller heatsinks, directly contributing to robot power density and duty cycle performance.
Applicable Scenarios: BLDC/PMSM motor inverter bridge driving in joint modules, servo amplifier output stages requiring high voltage ruggedness.
Scenario 2: Auxiliary System Power Management – Functional Support Device
Recommended Model: VBQG7313 (Single-N, 30V, 12A, DFN6(2x2))
Key Parameter Advantages: Low Rds(on) of 20mΩ at 10V drive combined with high 12A current capability. Low gate threshold voltage (1.7V) compatible with 3.3V/5V logic.
Scenario Adaptation Value: The ultra-small DFN6 footprint is ideal for dense power management PCB areas. Very low conduction loss is perfect for high-current power path switching (e.g., for sensors, controllers, lighting) or as a synchronous rectifier in point-of-load DC-DC converters. Enables efficient and intelligent power distribution, allowing different subsystems (vision, AI compute, communication) to be powered on/off dynamically for energy saving.
Applicable Scenarios: High-side/Low-side load switching, POL converter synchronous rectification, central power distribution control.
Scenario 3: End-Effector & Precision Control – Safety-Critical & Compact Device
Recommended Model: VBQG5325 (Dual N+P, ±30V, ±7A, DFN6(2x2)-B)
Key Parameter Advantages: Highly integrated dual N-Channel and P-Channel MOSFETs in one package with matched characteristics (Rds(on) 18/32mΩ @10V). Provides complementary switching capability in minimal space.
Scenario Adaptation Value: The integrated dual configuration simplifies circuit design for H-bridges or half-bridges used in precise end-effector control (e.g., micro-diaphragm pump for adhesive, solenoid valve, heater PID control). Excellent parameter consistency ensures balanced operation. The compact package is ideal for space-constrained end-of-arm tooling (EoAT). Enables safe and independent enable/disable of critical end-effector functions with fault isolation capability.
Applicable Scenarios: Compact H-bridge for small actuators/valves, complementary power switching for heater control, level-shifted high-side switching with integrated low-side driver.
III. System-Level Design Implementation Points
Drive Circuit Design
VBGQF1201M: Pair with dedicated motor driver ICs or gate drivers capable of sourcing/sinking adequate peak current for fast switching. Careful PCB layout to minimize power loop inductance is critical.
VBQG7313: Can be driven directly by MCU GPIO for slower switching or with a gate driver for higher frequency. Include a gate resistor to damp ringing.
VBQG5325: Design gate drive circuits considering the different requirements for N and P-channels. May use a dedicated half-bridge driver IC for optimal performance.
Thermal Management Design
Graded Heat Dissipation Strategy: VBGQF1201M in motor drives requires substantial PCB copper pour, potentially connected to the joint housing or a dedicated heatsink. VBQG7313 and VBGQF5325 can rely on their package's thermal pad connected to a generous PCB copper area.
Derating Design Standard: Derate continuous current to 60-70% of rated value in compact spaces. Maintain junction temperature well below maximum rating, considering ambient temperatures inside enclosed robot joints.
EMC and Reliability Assurance
EMI Suppression: Use snubber circuits or parallel high-frequency capacitors across drain-source of motor drive MOSFETs (VBGQF1201M). Ensure proper shielding and filtering for sensor lines.
Protection Measures: Implement overcurrent detection and hardware shutdown for all motor phases. Use TVS diodes on power inputs and near MOSFET gates for surge and ESD protection. Incorporate redundant safety checks for end-effector control loops.
IV. Core Value of the Solution and Optimization Suggestions
The power MOSFET selection solution for intelligent adhesive dispensing collaborative robots, based on scenario adaptation logic, achieves full-chain coverage from high-power motion control to intelligent power distribution and precise end-effector actuation. Its core value is mainly reflected in the following three aspects:
1. Precision Motion with High Power Density: By selecting the high-voltage VBGQF1201M for joint drives and the highly integrated VBQG5325 for end-effectors, the solution enables precise current control and fast dynamic response in an extremely compact form factor. This is fundamental for achieving smooth, accurate robot trajectories and delicate dispensing work, while allowing for more streamlined and lightweight mechanical designs.
2. Intelligent Power & Thermal Efficiency: The use of ultra-low Rds(on) devices like VBQG7313 for power management minimizes conduction losses across distributed subsystems. This intelligent power gating capability, combined with reduced heat generation from all selected MOSFETs, lowers overall system thermal load, improves energy efficiency, and enhances long-term reliability—critical for 24/7 production environments.
3. Balanced Robustness and Integration: The selected devices offer strong electrical margins (voltage, current) and come in robust, space-saving packages suitable for the demanding industrial environment. The integration level, particularly with the dual N+P chip (VBQG5325), reduces component count, saves board space, and simplifies assembly. This balance between rugged performance, high integration, and cost-effectiveness accelerates development and ensures field reliability.
In the design of the power and drive system for intelligent collaborative robots, power MOSFET selection is a core link in achieving precision, efficiency, compactness, and safety. The scenario-based selection solution proposed in this article, by accurately matching the characteristic requirements of different functional blocks and combining it with system-level drive, thermal, and protection design, provides a comprehensive, actionable technical reference for robot development. As collaborative robots evolve towards higher dexterity, greater intelligence, and deeper human-robot interaction, the selection of power devices will place greater emphasis on deep integration with motion control algorithms and system health monitoring. Future exploration could focus on the application of MOSFETs with integrated current sensing and temperature reporting, and the development of fully integrated motor-drive power modules, laying a solid hardware foundation for creating the next generation of high-performance, truly intelligent factory collaborators.

Detailed Topology Diagrams