Vicor MI-J20-IY/S: A Rugged DC-DC Converter for Military Applications
## Vicor MI-J20-IY/S DC-DC Converter for Military Applications
The Vicor MI-J20-IY/S is a high-density, military-grade DC-DC converter module engineered for reliability in demanding distributed power architectures. This component leverages Vicor’s first-generation zero-current/zero-voltage switching topology to deliver exceptional efficiency and power density. It is specifically constructed to meet the rigorous environmental standards of MIL-STD-810, ensuring operational integrity under extreme conditions.
* **Core Specifications**: Input 18-50V | Output 28V | Power 50W
* **Key Advantages**: High power density in a compact footprint, compliance with MIL-STD-704D/E voltage standards.
* **Engineered for Extremes**: The module’s full epoxy encapsulation allows it to withstand high levels of shock, vibration, and humidity.
Download Official Datasheet (PDF)
Technical Analysis for System Integration
The standout characteristic of the MI-J20-IY/S is its ability to deliver 50 watts of regulated power from a compact, industry-standard package. This high power density is a direct result of its advanced switching topology, which minimizes internal energy losses. For system designers, this translates to smaller, lighter end-products, a critical factor in aerospace and portable military equipment. The module’s high efficiency, reaching up to 90%, reduces the amount of waste heat generated during operation.
Think of the module’s thermal resistance as the bottleneck in a pipe; a lower value means heat can escape more easily. The MI-J20-IY/S is designed with a metal baseplate to facilitate efficient heat transfer to an external heatsink. This robust thermal management is crucial for maintaining reliability, as excessive heat is a primary cause of electronic component failure. The module is fully encapsulated in thermally conductive epoxy, which not only aids in heat dissipation but also protects internal components from mechanical stress and environmental ingress, as stipulated by MIL-STD-810 standards.
Optimized Application Scenarios
This DC-DC converter is specified for high-reliability systems where performance cannot be compromised.
* **Military Ground Vehicles**: Its compliance with MIL-STD-704D/E ensures it can handle the unstable voltage supply typical in vehicular power systems.
* **Avionics and Aerospace**: The module’s high power density and qualification for shock and vibration make it suitable for control and communication systems where space and weight are at a premium.
* **Naval Systems**: The MI-J20-IY/S is designed to resist environmental factors like salt fog, a common requirement for electronics deployed in marine environments.
* **Industrial Controls**: In rugged industrial automation, its wide input voltage range and robust packaging provide a reliable power source in electrically noisy and physically harsh factory settings.
This component is the optimal choice for systems requiring a proven, military-qualified power converter with a high power-to-size ratio and operational resilience.
Key Specifications of the MI-J20-IY/S
| Electrical Characteristics (at Tc = 25°C unless otherwise specified) | |
|---|---|
| Input Voltage Range | 18V – 50V DC (28V Nominal) |
| Output Voltage | 28V DC |
| Output Power | 50W |
| Efficiency | 80-90% |
| Output Voltage Trim Range | +10% to -50% of nominal |
| Operating Temperature (M-Grade) | -55°C to +85°C (at baseplate) |
Engineer’s FAQ
What is the primary method for cooling the MI-J20-IY/S module?
The primary cooling method is conduction. The module features a metal baseplate designed for mounting to a heatsink or chassis. Effective thermal management requires a thermal interface material between the module’s baseplate and the mounting surface to minimize thermal resistance.
How do I adjust the output voltage?
The output voltage can be trimmed from 50% to 110% of its nominal value. This is accomplished by connecting an external resistor between the Trim pin and either the +Sense or -Sense pin, depending on whether you are trimming up or down. The specific resistor values are detailed in the official product datasheet.
Is this module suitable for applications with severe shock and vibration?
Yes. The MI-J20-IY/S is fully encapsulated in a rugged epoxy, a design choice that makes it highly resistant to mechanical shock, vibration, and acceleration. It is specifically engineered to meet the environmental requirements outlined in MIL-STD-810.
What is the function of the Inhibit pin?
The Inhibit pin is a logic-level input that allows an external circuit to shut down the converter. This feature is useful for power sequencing or for placing the unit in a standby mode to conserve power. Refer to the datasheet for specific logic levels and implementation details.
This Vicor power semiconductor module provides engineers with a robust, off-the-shelf solution for converting DC power in harsh environments. The combination of high power density, proven switching technology, and military-grade construction enables the development of compact and highly reliable electronic systems.