The VTM Low Profile Series features high-efficiency Vicor Transformer Modules designed for Factorized Power Architecture (FPA) systems in space-constrained applications. These modules provide current multiplication with galvanic isolation when used with PRMs (Primary Regulated Modules), delivering high current at low voltage from an intermediate bus voltage in a compact LVM package.
Overview
The VTM Low Profile Series represents Vicor's solution for current multiplication with galvanic isolation in Factorized Power Architecture (FPA) systems for space-constrained applications.
VTMs (Vicor Transformer Modules) work in conjunction with PRMs (Primary Regulated Modules) to create a complete power solution. The VTM provides current multiplication and isolation, while the PRM provides regulation and power factor correction.
Key Features
Current Multiplication
VTM modules multiply current while reducing voltage based on the turns ratio, ideal for low-voltage, high-current applications.
Low Profile Design
LVM packaging technology provides a compact, low-profile solution ideal for space-constrained applications with height restrictions.
Galvanic Isolation
Provides safety isolation and noise immunity with high voltage standoff between input and output in a compact form factor.
High Efficiency
Achieves up to 98.2% efficiency through fixed-ratio transformation at high switching frequency with minimal losses.
Technical Specifications
| Model | Power Range | Efficiency | Input Voltage | Output Voltage/Current | Package | Applications |
|---|---|---|---|---|---|---|
| VTM4848015-L | 300W | 98.0% | 42-54V | 1:1 | LVM | 48V to 48V conversion |
| VTM4824030-L | 600W | 98.2% | 42-54V | 2:1 | LVM | 48V to 24V conversion |
| VTM4812046-L | 1000W | 98.1% | 42-54V | 4:1 | LVM | 48V to 12V conversion |
| VTM2412046-L | 1000W | 97.9% | 21-27V | 2:1 | LVM | 24V to 12V conversion |
| VTM1206046-L | 500W | 97.7% | 10.5-13.5V | 2:1 | LVM | 12V to 6V conversion |
Applications
VTM Low Profile modules are optimized for applications requiring high current at low voltage with galvanic isolation in space-constrained environments. Common applications include:
Aviation Electronics
High-current power delivery for aircraft systems with tight height restrictions and galvanic isolation.
Medical Equipment
Compact isolated power supplies for medical devices requiring high current in limited vertical space.
Telecommunications
Low-profile isolated power delivery for networking equipment with high efficiency requirements.
Design Considerations
Factorized Power Architecture
VTMs must be used with PRMs to form a complete power solution. The PRM provides regulation to the intermediate bus voltage, while the VTM provides current multiplication and isolation to the load. The output voltage of the system is determined by both the PRM regulation and the VTM turns ratio.
Thermal Management
In space-constrained applications, thermal management becomes critical. Consider airflow and thermal vias to PCB copper to manage heat dissipation in low-profile packages. The compact design may require additional thermal management strategies compared to standard packages.
Layout Recommendations
For optimal performance in compact applications, ensure proper decoupling between PRM and VTM stages. Minimize loop inductance between the PRM and VTM to maintain efficiency and stability in tight spaces.
Frequently Asked Questions
How do VTMs differ from traditional transformers?
VTMs are active transformer modules that operate at high frequency with minimal losses, achieving very high efficiency and power density in compact form. They are designed specifically for FPA systems and provide current multiplication with galvanic isolation.
What is the relationship between PRM and VTM in FPA?
The PRM provides regulation to an intermediate bus voltage (typically 48V), while the VTM provides current multiplication and isolation to the load. The output voltage is determined by the PRM regulation and the VTM turns ratio.
Can VTMs be used without PRMs?
VTMs are designed for use with PRMs in FPA systems to create a complete regulated power solution. However, they can be used with other regulated sources if the input voltage and operating conditions are appropriate.
Related Products
DCM Modules
Fixed-ratio bus converters with galvanic isolation for voltage transformation without regulation.
BCM Modules
Current multiplication bus converters with bidirectional power flow for non-isolated applications.
VTM Modules
Vicor Transformer Modules for current multiplication with isolation in FPA systems.