The **MI-RJ72-IA** is a high-reliability, military-grade DC-DC converter module produced by **Vicor Corporation**. It is part of the **MI-200** family, specifically designed for applications requiring robust power density and compliance with strict military standards. --- ## 1. Technical Specifications Below are the primary electronic characteristics of the MI-RJ72-IA: | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 270V DC (Nominal) | | **Output Voltage** | 15V DC | | **Output Power** | 25 Watts | | **Product Grade** | Military (I-Grade) | | **Efficiency** | Up to 80% - 90% (Typical) | | **Operating Temperature** | -40°C to +85°C (Case) | | **Isolation** | 3,000V RMS | --- ## 2. Key Electronic Features ### A. Zero-Current Switching (ZCS) Unlike standard PWM converters, this module uses a **Zero-Current Switching** topology. This allows the internal MOSFETs to switch only when current is at zero, significantly reducing: * Switching losses. * Electromagnetic Interference (EMI). * Thermal stress on components. ### B. Input/Output Performance * **Wide Input Range:** While nominal at 270V, these modules typically handle transients common in airborne or defense power systems. * **Voltage Trimming:** The output voltage (15V) can usually be adjusted (trimmed) within a range of -10% to +10% using external resistors. * **Remote Sensing:** Compensates for voltage drops across the output leads to ensure a precise 15V at the load. ### C. Protection Circuitry The module integrates several self-protection electronic layers: 1. **Overvoltage Protection (OVP):** Shuts down if output exceeds safe levels. 2. **Short Circuit Protection:** Continuous current limiting. 3. **Overtemperature Shutdown:** Protects the internal substrate if the case exceeds 85-95°C. --- ## 3. Compliance and Standards The "MI" prefix signifies that the internal components and manufacturing processes meet specific military requirements: * **MIL-STD-810:** Environmental testing (Shock/Vibration). * **MIL-STD-461:** Conducted and radiated emissions (when used with appropriate filters). * **NAVMAT P-4855-1:** Component derating guidelines. --- ## 4. Pin Configuration Reference | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | +In | Positive Input (270V) | | **2** | Gate In | Module Synchronization/Control | | **3** | Gate Out | Parallel Operation Control | | **4** | -In | Negative Input | | **5** | +Out | Positive Output (15V) | | **6** | +Sense | Remote Sense (Positive) | | **7** | Trim | Output Voltage Adjustment | | **8** | -Sense | Remote Sense (Negative) | | **9** | -Out | Negative Output |