Content last revised on July 21, 2026
VI-252-CY Vicor Isolated DC-DC Converter Module
A highly efficient, zero-current switching isolated DC-DC converter designed to deliver stable 15V output from a wide 100V to 200V input range.
150V Nominal Input | 15V Output | 50W Power Rating | 3 kV isolation.
Key Benefits: Minimizes switching losses via ZCS; enhances reliability with 3 kV isolation.
For industrial control boards prioritizing high isolation and low switching noise, this 50W module is the optimal choice.
Key Parameter Overview
Highlighted Specifications for High-Reliability Power Integration
| Parameter | Specification / Metric | Design Significance |
|---|---|---|
| Manufacturer | Vicor | Industry-established vendor for high-density power modules. |
| Input Voltage Range (Vin) | 100V to 200V DC (150V Nominal) | Accommodates standard telecommunication and industrial high-voltage DC buses. |
| Output Voltage (Vout) | 15V DC | Provides regulated low-voltage power for control logic and gate drives. |
| Output Current (Iout) | 3.33A | Supports multiple industrial control loads within rated power envelope. |
| Output Power (Pout) | 50W | Optimal capacity for auxiliary systems without excessive thermal dissipation. |
| Isolation Voltage (Viso) | 3,000V RMS (3 kV) | Prevents ground loop errors and protects low-voltage circuits from high-voltage spikes. |
| Efficiency | 90% Typical | Reduces internal heat generation and cooling system requirements. |
| Operating Temperature | –25°C to 85°C (Baseplate) | Ensures stable thermal performance under standard industrial conditions. |
| Package Size | Full Brick (4.6" x 2.4" x 0.5") | Standard physical footprint for reliable chassis or PCB mounting. |
Download the VI-252-CY datasheet for detailed specifications and performance curves.
Application Scenarios & Value
Optimizing Efficiency in Low-Power Control Systems and Heavy Industry
Engineers seeking a reliable 150V input to 15V output DC-DC converter for industrial logic boards find that the VI-252-CY delivers stable power regardless of input line fluctuations. In heavy industrial environments, control systems are often subjected to massive electrical noise and ground loop issues. The VI-252-CY provides a highly isolated 15V supply to power logic circuits and gate drivers.
For instance, when dealing with motor starting inrush currents on an industrial conveyor system, the module's stable 15V output prevents control board resets, maintaining system uptime. This stability makes it highly suitable for integration into industrial automation setups, telemetry units, and Uninterruptible Power Supply (UPS) auxiliary rails. Designers consulting a power semiconductor selection guide often select this module for its proven track record in high-density installations.
While this 50W module is ideal for medium-load control circuits, systems requiring high-power switching stages can utilize modules like the SKM300GA123D or FF450R12KE4 to complete the power train. Consulting resources on semiconductor selection helps system architects align auxiliary converters with primary inverter components.
Technical & Design Deep Dive
Zero-Current Switching Topology and Thermal Efficiency Breakdown
The core of the VI-252-CY's performance lies in its Zero-Current Switching (ZCS) topology. Traditional converters suffer from high switching losses because the power transistors turn on and off while carrying current. ZCS solves this by waiting for the current through the switch to drop to zero before initiating the state transition. This is akin to a driver shifting gears only when the clutch is fully depressed, eliminating transmission wear. In electrical terms, this virtually eliminates switching losses, allowing the module to run cooler and achieve up to 90% efficiency.
Additionally, the Full Brick packaging provides a large copper baseplate. This allows direct attachment to a heatsink, minimizing the junction-to-case thermal resistance (Rth(j-c)) and enabling full-power operation even in space-constrained, convection-cooled enclosures. The 3 kV isolation barrier acts as an electrical firewall, preventing dangerous high-voltage spikes on the input side from crossing over to the low-voltage control circuitry, similar to a physical double-containment barrier in a chemical processing plant.
Frequently Asked Questions
Addressing Engineering Inquiries on Voltage Margins and Thermal Derating
What is the significance of the "C" and "Y" suffixes in the VI-252-CY model number?
The "C" suffix specifies the operating temperature range of –25°C to 85°C (baseplate), while the "Y" suffix indicates a power output rating of 50W at the nominal 15V output voltage.
How does the 3 kV RMS isolation rating of the VI-252-CY benefit industrial logic boards?
The 3 kV isolation acts as an electrical firewall, protecting sensitive low-voltage control circuits from high-voltage transients (up to 200V) present on the input side, preventing catastrophic system resets.
What is the typical input voltage range for this module, and how does it handle fluctuations?
The module accepts a wide input range of 100V to 200V DC (nominal 150V). Its internal regulation loop keeps the 15V output stable within tight tolerances even during rapid input line changes.
Is it necessary to use a heatsink with the VI-252-CY at its full 50W output power?
Yes, depending on the ambient temperature and airflow. Because the module is housed in a Full Brick package, utilizing the baseplate to dissipate thermal energy is crucial. Keeping the baseplate below 85°C prevents thermal shutdown.
When designing power architectures for high-reliability systems, incorporating isolated converters with proven topologies is a strategic approach to ensuring long-term operational stability and lowering the total cost of ownership.
