The **RTS-0509-R** is a high-quality, sub-miniature DC/DC converter manufactured by **RECOM Power**. It belongs to the RTS series, which is specifically designed for board-level power isolation and voltage conversion in space-constrained applications. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Input Voltage** | 5V DC (Nominal) | | **Output Voltage** | 9V DC | | **Output Power** | 1 Watt | | **Isolation Voltage** | 1kV DC (Standard) | | **Efficiency** | 70% to 80% (Typical) | | **Package Type** | SMD (Surface Mount Device) | | **Operating Temp** | -40°C to +85°C (without derating) | --- ### 2. Functional Components & Internal Design The RTS-0509-R is an **unregulated** converter. Internally, it consists of several core electronic sections: 1. **Switching Oscillator:** Converts the 5V DC input into a high-frequency AC signal. 2. **Isolation Transformer:** Uses a tiny ferrite core transformer to transfer energy magnetically. This provides the 1kV DC galvanic isolation between the input and output circuits. 3. **Rectification & Filtering:** High-speed diodes convert the AC back to DC, and internal capacitors smooth the ripple to provide a steady 9V output. 4. **Housing:** Encapsulated in a non-conductive plastic case (UL94V-0 rated) to protect against environmental factors and ensure electrical safety. --- ### 3. Pin Configuration (SMD) The "R" in the suffix typically denotes the **Reel** packaging, but the physical layout follows the standard RTS SMD footprint: * **Pin 1:** -Vin (Ground) * **Pin 2:** +Vin (Input Supply) * **Pin 5:** -Vout (Common/Ground) * **Pin 8:** +Vout (9V Output) * *Note: Pins 3, 6, and 7 are usually "No Connection" (NC) or omitted.* --- ### 4. Common Applications * **Digital Isolation:** Providing isolated power to logic gates or microcontrollers to prevent noise loops. * **Industrial Interfaces:** Powering RS-232 or RS-485 drivers where the signal lines require isolation. * **Sensor Power:** Providing a clean 9V rail from a standard 5V USB or logic bus for analog sensors. * **Medical Equipment:** Used in non-patient-critical circuits requiring basic isolation. --- ### 5. Implementation Notes * **No Minimum Load:** Unlike many older DC/DC converters, the RTS series typically does not require a minimum load to operate safely. * **Capacitive Load:** To reduce output ripple, it is recommended to place a small ceramic capacitor (e.g., 1μF - 10μF) near the output pins. * **Unregulated Nature:** Note that if the input voltage fluctuates or the load changes significantly, the 9V output will vary slightly.