The **RTS-243.3-R** is a specific model of an isolated DC/DC converter manufactured by **RECOM Power**. It belongs to the **RTS series**, which is known for being a 2-watt, high-isolation, unregulated power module in a compact SMD (Surface Mount Device) package. --- ### 1. Key Technical Specifications The model number "243.3" indicates the input and output voltage configurations. | Parameter | Specification | | :--- | :--- | | **Input Voltage** | 24V DC (Nominal) | | **Output Voltage** | 3.3V DC | | **Power Rating** | 2 Watts | | **Isolation Voltage** | 1kV DC (Standard) | | **Package Type** | SMD (Surface Mount) | | **Efficiency** | ~70% to 75% | | **Output Current** | ~606 mA | --- ### 2. Electronic Architecture The internal circuitry of the RTS-243.3-R consists of several critical stages: 1. **Oscillator/Switching Stage**: Converts the 24V DC input into a high-frequency AC signal. 2. **Isolation Transformer**: Transfers the energy across a magnetic barrier. This provides galvanic isolation, protecting the load from input-side surges and breaking ground loops. 3. **Rectification & Filtering**: The AC signal is converted back to DC (3.3V). Since this is an **unregulated** converter, the output voltage may fluctuate slightly based on the load (load regulation) and input voltage variations (line regulation). 4. **Feedback (Limited)**: As an unregulated device, it does not have a complex closed-loop feedback system like regulated converters, making it more cost-effective and compact. --- ### 3. Pinout and Physical Form Factor The "R" suffix typically denotes the packaging style (often Reel/Tape for automated assembly). * **Compact Design**: It uses a "Big 5" or "Little 8" SMD footprint depending on the specific series revision, saving significant PCB space. * **Operating Temperature**: Usually rated for -40°C to +85°C without derating, making it suitable for industrial environments. --- ### 4. Typical Applications Because it provides 3.3V from a 24V rail with isolation, it is commonly used for: * **Digital Logic Power**: Supplying microcontrollers or FPGAs that require 3.3V in a 24V industrial system. * **Ground Loop Elimination**: Preventing noise in sensitive analog-to-digital measurement circuits. * **IGBT Gate Drivers**: Providing isolated bias voltages. ---