MEAN WELL VFD-350P-48 350W 48V DC Input Variable Frequency Drive Module

Overview

The MEAN WELL VFD-350P-48 is a 350W 48V DC input variable frequency drive module designed for compact three-phase motor drive systems. It provides an integrated power stage with three-phase switches, gate drivers, and basic VFD sensor functions, allowing system designers to build motor drive solutions by coordinating the module with an external motor drive controller through logic-level and analog I/O.

As a PCB-type VFD module, the VFD-350P-48 supports a 20–55VDC input range and is suitable for 48V class motor applications. Its three-phase motor output supports up to 55VDC, with line-to-line voltage adjustable from 0–34V by modulated PWM. The module is intended for use with BLDC motors, induction motors, and SynRM motor drive applications.

The VFD-350P-48 delivers 350W rated power, 92.5% typical efficiency, and high peak current capability up to 200% for 5 seconds. Its compact 4″ × 2″ size and fanless design make it suitable for integration into space-limited motor systems where silent operation and long service life are important.

Typical applications include HVAC systems, fans, water and air pumps, power tools, conveyors, automatic doors, fitness equipment, and other three-phase motor drive systems requiring a compact 48V VFD power module.

Features

• 350W 48V DC Input Variable Frequency Drive Power Module
• 20–55VDC Input Range for 48V Class Motor Drive Applications
• Line-to-Line Output Voltage Adjustable from 0–34V by Modulated PWM
• Integrated 3-Phase Switches, Gate Drivers, and Basic VFD Sensor Functions
• 3-Phase PWM Control Compatible with 3.3V TTL / CMOS Input Signals
• High Peak Current Capability up to 200% for 5 Seconds
• 92.5% Typical Efficiency
• Fanless Design for Silent Operation and Long Lifetime
• Built-In Current Sensor Outputs, DC Bus Voltage Sensor, and IGBT Temperature Sensor
• Auxiliary 15V Output Power for External Control Board
• Short Circuit and Overcurrent Protection with Active-Low Fault Signal Output
• Wide -30°C to +70°C Operating Temperature Range
• Suitable for BLDC, Induction Motor, and SynRM Three-Phase Motor Drive Systems

Need help applying the VFD-350P-48 to your motor drive system? Review the main specifications and control functions below, or contact us for model availability and application support.

Control Functions

The MEAN WELL VFD-350P-48 integrates the main power-stage and sensing functions required for a compact three-phase motor drive system. It is designed to work with an external motor drive control board through 3.3V TTL / CMOS PWM input signals and analog sensor outputs.

3-Phase PWM Control

The VFD-350P-48 provides six-switch control using three half-bridge IGBTs. PWM_UH / PWM_UL, PWM_VH / PWM_VL, and PWM_WH / PWM_WL inputs are used to control the U, V, and W phases. The PWM input is compatible with 3.3V TTL / CMOS signals, with High > 2.7V and Low < 0.4V.

Current Detection and Overcurrent Protection

Low-side 6mΩ shunt resistors are built into each phase for current measurement and short-circuit detection. If the output current exceeds 200% of the rated value, the internal protection circuit shuts down the gate driver for protection.

DC Bus Voltage Detection

The built-in DC bus voltage sensor provides a 2.5V output when the DC bus voltage is 48V. This output can be used by the external control board for DC bus monitoring and protection logic.

Temperature Detection and Fault Signal

The module includes a built-in NTC resistor for IGBT temperature detection. It also provides an active-low FAULT signal to notify the external controller when an overcurrent state occurs.

Mechanical Dimensions and Installation

The MEAN WELL VFD-350P-48 is a compact PCB-type variable frequency drive module designed for integration into three-phase motor drive systems. Its 4″ × 2″ miniature format makes it suitable for equipment where limited internal space, silent operation, and compact power-stage design are important.

According to the mechanical specification, the VFD-350P-48 measures 101.6 × 50.8 × 28.6 mm, with a tolerance of ±1 mm. The module includes DC input, three-phase motor output, and control signal connectors for integration with an external motor drive control board.

Dimensions

The VFD-350P-48 has mechanical dimensions of 101.6 × 50.8 × 28.6 mm. This compact size allows the module to be installed inside motor drive equipment, fan systems, pump systems, automatic doors, fitness equipment, and other embedded motor control applications.

Connector Layout

The module includes dedicated connectors for DC input, PWM output, and control signal assignment. The CN93 control connector provides access to DC bus voltage sensing, auxiliary 15V output, temperature sensing, fault signal output, PWM control inputs, and phase current sensor outputs.

Installation Notes

The VFD-350P-48 uses a fanless module design. During equipment integration, system designers should follow the datasheet derating curve, provide suitable thermal management, and maintain proper clearance around the module. The external control board should also monitor current, DC bus voltage, temperature, and fault signals to support safe motor drive operation.

Need application and compliance information for the VFD-350P-48? Continue below to explore recommended applications, safety approvals, EMC information, and datasheet download.

Applications

The MEAN WELL VFD-350P-48 is suitable for compact three-phase motor drive systems that require a 48V DC input VFD power module. According to the datasheet, it is designed for a range of motor-driven equipment, including ventilation, pumping, automation, material handling, and fitness-related applications.

With its 350W rated power, 20–55VDC input range, compact 4″ × 2″ PCB-type design, fanless operation, and integrated sensing functions, the VFD-350P-48 is well suited for embedded motor drive applications where space, reliability, and external control flexibility are important.

• HVAC Systems
• Fan Applications
• Water and Air Pumps
• Power Tools
• Conveyors
• Automatic Doors
• Fitness Equipment
• BLDC, Induction Motor, and SynRM Drive Systems

Need certification and compliance details for your project? Continue below to review the safety standards, EMC information, and related approval data for the VFD-350P-48.

Certifications and Safety

The MEAN WELL VFD-350P-48 includes safety and EMC compliance information for compact variable frequency drive module applications. These approvals and test standards help support integration into motor drive equipment, industrial control systems, HVAC equipment, pump systems, and other embedded three-phase motor applications.

According to the official datasheet, the VFD-350P-48 includes the following safety and EMC information:

• CB IEC61800-5-1
• TUV / BS EN / EN61800-5-1
• EAC TP TC004 Approved
• EMC Emission: BS EN / EN IEC61800-3, Second Environment
• Conducted Emission: BS EN / EN IEC61800-3, Class A, C2
• Radiated Emission: BS EN / EN IEC61800-3, Class A, C2
• EMC Immunity: BS EN / EN IEC61800-3
• ESD: BS EN / EN61000-4-2, Level 3 8kV Air, Level 2 4kV Contact
• Radiated Immunity: BS EN / EN IEC61000-4-3, Level 3
• EFT / Burst: BS EN / EN61000-4-4, Level 3
• Surge: BS EN / EN61000-4-5, Level 2
• Conducted Immunity: BS EN / EN61000-4-6, Level 3
• Magnetic Field: BS EN / EN61000-4-8, Level 2

The datasheet also lists short circuit and overcurrent protection. When a fault condition occurs, the module shuts down output voltage and requires re-power on to recover. The external control design should also monitor current, DC bus voltage, temperature, and the active-low FAULT signal to support safe system-level operation.

Need more product details before sending an inquiry? Continue below to review common questions about the VFD-350P-48.