The **RSS-0509-R** is a specific model of a DC/DC converter manufactured by **RECOM Power**. It is part of the RSS series, which are subminiature, isolated, unregulated converters designed for board-level power distribution. --- ### 1. Technical Specifications The "0509" in the part number indicates the input and output voltage ratings. | Parameter | Value | | :--- | :--- | | **Input Voltage** | 5V DC (Nominal) | | **Output Voltage** | 9V DC | | **Output Current** | 111 mA | | **Power Rating** | 1 Watt | | **Isolation Voltage** | 1kV DC (Standard) | | **Efficiency** | ~75% to 80% | | **Package Type** | SMD (Surface Mount Device) | --- ### 2. Key Internal Components & Functions To achieve the voltage conversion in such a small form factor, the RSS-0509-R utilizes several electronic subsections: * **Switching Controller:** An internal oscillator that converts the 5V DC input into a high-frequency AC signal. * **Transformer:** A miniature toroidal or bobbin-based transformer provides the **Galvanic Isolation**. This allows the output ground to be independent of the input ground, protecting sensitive components from noise or voltage spikes. * **Rectification & Filtering:** High-speed diodes convert the AC back to DC, and internal capacitors smooth the ripple to provide a steady 9V output. * **Lead-Free Construction:** The "-R" suffix typically denotes compliance with RoHS standards and packaging in **Tape & Reel** for automated assembly. --- ### 3. Application Use Cases This part is commonly used when a circuit board has a 5V rail but requires a specific 9V supply for a small sub-system. * **Data Acquisition:** Powering operational amplifiers (Op-Amps) that require 9V for better headroom. * **Industrial Interface:** Providing isolated power for RS-485 or CAN bus transceivers to prevent ground loops. * **Sensor Power:** Supplying 9V to specialized sensors that cannot operate on standard 3.3V or 5V logic levels. --- ### 4. Typical Connection Diagram ```cpp [Input Side] [Isolated Output Side] Pin 1: -Vin (GND) ---- Pin 5: -Vout (GND) Pin 2: +Vin (5V) ---- Pin 8: +Vout (9V) // Note: External MLCC capacitors (1uF - 10uF) // are recommended on input/output for noise reduction. ```