VTM (Vicor Transformer Module) series provides high-efficiency current multiplication with galvanic isolation. These current multiplication devices transfer power from input to output with voltage transformation while preserving the dynamic response of the power delivery network. VTMs are designed for use in Factorized Power Architecture (FPA) systems when paired with PRMs (Propensity Regulated Modules).
VTM Modules Overview
VTM (Vicor Transformer Modules) represent Vicor's implementation of current multiplication transformers with galvanic isolation. These devices are designed to work in conjunction with PRMs (Propensity Regulated Modules) in Factorized Power Architecture (FPA) systems. The VTM handles voltage transformation and current multiplication while the PRM provides regulation, preserving the dynamic response of the power delivery network.
Unlike traditional transformers, VTMs are optimized for power delivery in FPA systems, allowing for fast transient response while maintaining current multiplication and isolation. The technology provides galvanic isolation with voltage transformation and current multiplication in a compact package.
Key Features and Benefits
Current Multiplication
VTM modules provide current multiplication in the inverse ratio of voltage transformation, enabling high-output current from lower-input current.
- Current multiplication with voltage transformation
- Galvanic isolation maintained
- No regulation bandwidth limitation
- High efficiency operation
Dynamic Response Preservation
Unlike regulated converters, VTMs preserve the dynamic response characteristics of the power delivery network for fast load transient response.
- Preserved load-side dynamics
- Immediate response to load changes
- High bandwidth operation
- No feedback loop delay
Galvanic Isolation
VTM modules provide reinforced galvanic isolation with high voltage stand-off capability for safety and noise isolation.
- High isolation voltage (up to 8000V)
- Enhanced safety in power systems
- Common-mode noise rejection
- Protection between power domains
High Efficiency
Efficiency exceeding 97% across the load range with peak efficiency exceeding 98% for many models.
- 97%+ efficiency typical
- Reduced thermal dissipation
- Minimal power losses
- High power density enabling
Factorized Power Architecture
Designed specifically for FPA applications where PRMs provide regulation and VTMs provide current multiplication with isolation.
- Works with PRM modules
- Preserves load dynamics
- Current multiplication option
- High-density implementation
Compact Packaging
Available in VIA (Vertical Integrated Array) and ChiP (Converter in Package) technologies for space-constrained applications.
- VIA and ChiP package options
- High power density
- Surface mount compatibility
- Minimal external components
VTM Product Series
VTM High Current Series
High-current multiplication modules designed for applications requiring significant current multiplication with galvanic isolation.
Key Specifications:
- Current multiplication ratios up to 16:1
- Power range: 500W to 2000W
- Efficiency: up to 98.2%
- Isolation: up to 8000V
- Package: VIA, ChiP
Target Applications:
- High-current processor supplies
- AI accelerator power
- High-power industrial systems
- Telecom power delivery
VTM Low Profile Series
Space-constrained applications requiring current multiplication with galvanic isolation in a compact form factor.
Key Specifications:
- Current multiplication: 2:1 to 8:1
- Power range: 100W to 600W
- Efficiency: up to 97.8%
- Isolation: up to 2500V
- Package: LVI (Low Vertical Integration)
Applications:
- Low-profile power systems
- Aerospace systems
- Portable instrumentation
- Medical equipment
VTM Automotive Series
AEC-Q100 qualified VTM modules for automotive applications requiring current multiplication and isolation.
Automotive Specifications:
- AEC-Q100 qualified
- Temperature: -40°C to +125°C
- Vibration and shock tested
- EMC compliance for automotive
- Lead-free and RoHS compliant
Automotive Applications:
- 48V mild hybrid systems
- Computational platform power
- Safety-critical systems
- Isolated power systems
VTM Aerospace Series
High-reliability VTM modules for aerospace and defense applications with enhanced environmental specifications.
Enhanced Specifications:
- Space-level reliability
- Extended temperature range
- Radiation tolerance options
- Hermetically sealed packages
- Enhanced life testing
Aerospace Applications:
- Satellite power systems
- Avionics power supplies
- Space exploration equipment
- Defense electronics
Factorized Power Architecture (FPA) Implementation
VTMs work in conjunction with PRMs to create Factorized Power Architecture (FPA) systems:
How FPA Works with VTM + PRM
In FPA systems:
- The PRM provides regulation at an intermediate voltage
- The VTM connects the intermediate voltage bus to the load
- The VTM transforms voltage and multiplies current in a fixed-ratio
- Load dynamics are preserved, providing fast response to load changes
Benefits of FPA Implementation:
- Fast dynamic response to load changes
- Galvanic isolation between input and load
- Current multiplication for high-current applications
- Efficient power delivery at high currents
- Regulation point-of-load without bandwidth limitations
Technical Specifications
| Model Series | Power Range | Efficiency | Transformation Ratio | Isolation | Package | Applications |
|---|---|---|---|---|---|---|
| VTM48EF012T050 | 500W | 98.2% | 4:1 | 2250Vdc | XTM | 48V to 12V conversion with current multiplication |
| VTM48EF015T040 | 400W | 98.1% | 16:5 | 2250Vdc | XTM | 48V to 15V conversion with current multiplication |
| VTM48EF024T020 | 200W | 98.3% | 2:1 | 2250Vdc | XTM | 48V to 24V conversion with current multiplication |
| VTM48EF028T017 | 170W | 98.0% | 24:7 | 2250Vdc | XTM | 48V to 28V conversion with current multiplication |
| VTM48EF048T010 | 100W | 97.8% | 1:1 | 2250Vdc | XTM | Isolated 48V distribution with current multiplication |
| VTM36EF012T075 | 750W | 98.0% | 3:1 | 2250Vdc | XTM | 36V to 12V conversion with current multiplication |
Applications
AI & HPC Power
High-current applications for powering AI accelerators, GPUs, and high-performance computing processors with fast transient response.
- High-current delivery
- Fast transient response
- Galvanic isolation
- High efficiency
Telecommunications
Power distribution systems in 5G infrastructure, base stations, and networking equipment requiring high efficiency and isolation.
- Isolated power systems
- High efficiency required
- Fast dynamic response
- Compact form factor
Automotive Systems
48V mild hybrid systems and other automotive power applications requiring current multiplication and safety isolation.
- 48V to 12V conversion
- Safety isolation requirements
- High power density
- Automotive qualification
Industrial Automation
Power supplies for factory automation, process controls, and instrumentation requiring isolation and high current delivery.
- Isolated power supplies
- High reliability requirements
- Harsh environment operation
- Current multiplication needs
Medical Equipment
Power systems for medical devices requiring patient isolation and high reliability with fast response.
- Patient isolation requirements
- High reliability
- Low noise operation
- Fast response to load changes
Avionics Power
Power systems for aviation applications with strict weight, size, and reliability requirements.
- Aerospace qualification
- Lightweight design
- High reliability
- Environmental compliance
Design Resources
VTM Application Notes
Implementation guides and design examples for various VTM applications and FPA implementations.
VTM Selection Guide
Guidance on selecting the appropriate VTM for specific current multiplication and isolation requirements.
Thermal Design Guide
Thermal management recommendations for VTM modules in various applications and environments.
Engineering Perspective: FPA System Design
Benefits of Using VTMs in FPA Systems
When designing with FPA using VTMs:
- Preserved load-side dynamics for fast transient response
- Galvanic isolation between input and output
- Current multiplication for high-current applications
- Efficient power delivery with high-current capability
- Regulation without bandwidth limitations
Design Considerations
Important considerations when implementing VTM-based FPA systems:
- PRM output voltage must match VTM input requirements
- Combined current capability must meet load requirements
- Proper input and output filtering for stability
- Thermal management for high-efficiency operation
- Layout considerations for optimal performance
Frequently Asked Questions
What's the difference between VTM and BCM?
VTMs are designed to work with PRMs in Factorized Power Architecture for regulated output with current multiplication. BCMs are stand-alone current multiplication devices without regulation. VTMs preserve load-side dynamics while BCMs have their own control characteristics.
How do I match a VTM with a PRM?
The PRM output voltage must match the voltage required by the load after VTM transformation. For example, if you need 1.2V at the load and are using a 4:1 VTM, configure the PRM for 4.8V output. The current multiplication factor will be the inverse of the voltage transformation ratio.
What is the efficiency of VTM modules?
VTM modules achieve very high efficiency, typically exceeding 97% across the load range with peak efficiency often exceeding 98% for many models. The ZVS technology contributes to these high efficiency levels.
Can VTMs be paralleled for higher current?
Yes, VTMs can be paralleled in FPA systems (with corresponding PRMs) for higher current applications. Their natural droop characteristics help with current sharing, similar to DCMs.
What protection features do VTMs provide?
VTMs provide galvanic isolation which offers protection against voltage differences and noise between input and output. They also feature inherent current limiting due to the design, though over-current protection depends on the upstream PRM in FPA systems.
How do VTMs contribute to system efficiency?
VTMs contribute to high system efficiency in FPA through their high (>97%) efficiency operation. The FPA approach allows the PRM to operate at an optimal voltage for efficiency while the VTM provides current transformation at the load, reducing I²R losses in power delivery.
Related Products
PRM Modules
Regulated modules that work with VTMs in Factorized Power Architecture systems.
BCM Modules
Bus converter modules providing current multiplication with galvanic isolation in stand-alone applications.
DCM Modules
Fixed-ratio isolated converters for voltage transformation without regulation.
Implement High-Current Power Solutions with VTMs
Our FAE team specializes in FPA system design with PRMs and VTMs. Contact us for technical support, custom solutions, or design guidance.