The **V28A5T175BK2** is a high-density, isolated DC-DC converter module from Vicor’s Maxi series. These modules are known for their high efficiency and reliability in industrial and military-grade applications. --- ### ## Technical Specifications | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 18V to 36V DC (Nominal 28V) | | **Output Voltage** | 5V DC | | **Output Power** | 175 Watts | | **Output Current** | 35 Amperes | | **Efficiency** | ~82% - 84% | | **Isolation Voltage** | 3,000 Vrms | | **Package Size** | Maxi (4.6" x 2.2" x 0.5") | | **Operating Temp** | -40°C to +100°C (T-Grade) | --- ### ## Key Features and Components 1. **ZCS/ZVS Switching:** The module utilizes **Zero Current Switching (ZCS)** and **Zero Voltage Switching (ZVS)**. This reduces electronic noise (EMI) and minimizes switching losses, allowing the part to operate at high power densities without overheating. 2. **Baseplate Cooling:** The "BK2" suffix indicates a specific baseplate configuration (typically a slotted baseplate). This allows for easy mounting to a heat sink, which is necessary when drawing the full 35A of current. 3. **Control Pins:** * **PR (Parallel):** Allows multiple units to be connected in parallel for higher power requirements. * **PC (Primary Control):** Used to disable the module or check its operational status. * **SC (Secondary Control):** Allows for fine-tuning the output voltage (Trim) above or below 5V. 4. **Protection Circuits:** Internal electronics include over-voltage protection (OVP), over-temperature shutdown, and short-circuit current limiting. --- ### ## Part Number Breakdown Understanding the nomenclature helps identify the electronic limits: | Segment | Code | Meaning | | :--- | :--- | :--- | | **Input Voltage** | **V28** | 28V Nominal (18-36V Range) | | **Module Size** | **A** | Maxi Size | | **Output Voltage** | **5** | 5 Volts | | **Product Grade** | **T** | -40°C to +100°C (Operating Temp) | | **Output Power** | **175** | 175 Watts | | **Baseplate/Pin** | **BK2** | Slotted Baseplate, Through-hole Pins | --- ### ## Application Usage This part is primarily used in: * **Defense/Aerospace:** Due to the 28V nominal input, it is standard for vehicle and aircraft power systems. * **Industrial Controls:** Powering high-current logic boards or sensors. * **Distributed Power Architectures:** Where a high-voltage bus needs to be stepped down to TTL levels (5V).