The **ATS2805S** is a high-performance, radiation-hardened DC-DC converter specifically designed for space and satellite applications. It belongs to a family of power converters manufactured by **Infineon (formerly International Rectifier/IR HiRel)**. --- ### ## Technical Specifications Overview The ATS2805S is engineered to operate in the harsh environment of space, focusing on reliability and stability under radiation. | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 18V to 50V DC | | **Output Voltage** | 5.0V DC | | **Output Power** | Up to 25 Watts | | **Efficiency** | ~80% (depending on load) | | **Operating Temperature** | -55°C to +125°C | | **Radiation Tolerance (TID)** | > 100 kRads(Si) | | **Package Type** | Hermetic, through-hole mount | --- ### ### Key Electronic Components & Features The internal architecture of the ATS2805S utilizes several critical electronic design strategies to ensure performance: #### 1. Magnetic Feedback System Unlike standard commercial converters that use opto-couplers (which degrade quickly under radiation), the ATS2805S uses **magnetic coupling** for feedback. This ensures the isolation between input and output remains stable throughout the mission life. #### 2. Radiation Hardened (Rad-Hard) MOSFETs The internal switching elements are proprietary Rad-Hard power MOSFETs. These components are resistant to: * **TID (Total Ionizing Dose):** Cumulative long-term damage from radiation. * **SEE (Single Event Effects):** Sudden failures caused by a single high-energy particle strike. #### 3. Integrated EMI Filter The device includes internal filtering components to minimize electromagnetic interference, ensuring that the high-frequency switching of the DC-DC converter does not disrupt sensitive communication equipment on the satellite. #### 4. Protection Circuitry The converter includes several "fail-safe" electronic blocks: * **Under-Voltage Lockout (UVLO):** Prevents the device from starting if the input voltage is too low. * **Overload & Short Circuit Protection:** Limits current to prevent thermal runaway. * **Soft Start:** Gradually increases output voltage to prevent current spikes during power-up. --- ### ### Application Use-Case The ATS2805S is typically used as a "Point of Load" (POL) converter or a main bus regulator for: * **On-board computers** (SBCs). * **Telemetry and Command** systems. * **Sensor payloads** requiring a stable 5V rail. ---