The **SSL40C** is a series of open-frame, AC-DC switching power supplies manufactured by Artesyn Embedded Power (now part of Advanced Energy). These units are designed for space-constrained applications, offering high reliability in a compact 2" x 4" footprint. --- ### 1. Key Technical Specifications The "40C" designation refers to its 40-watt power rating under convection cooling. Below are the primary specifications: | Feature | Specification | | :--- | :--- | | **Input Voltage Range** | 90 - 264 VAC (Universal Input) | | **Output Power** | 40W (Convection), Up to 50W (with 30CFM Airflow) | | **Typical Efficiency** | 70% - 85% (Model dependent) | | **Form Factor** | 2.0" x 4.0" x 1.2" (Open Frame) | | **Safety Certifications** | UL60950, CSA22.2, VDE, CE Mark (LVD) | | **MTBF** | >550,000 hours at full load | --- ### 2. Core Electronic Components The SSL40C utilizes a **Flyback Topology** for power conversion. The primary internal sections include: #### A. Input Filtering & Rectification * **EMI Filter:** A combination of X/Y capacitors and common-mode chokes to minimize electromagnetic interference. * **Bridge Rectifier:** Converts AC input to high-voltage DC. * **Inrush Current Limiter:** Usually a thermistor to prevent damage during initial power-up. #### B. Power Conversion Stage * **PWM Controller IC:** Regulates the duty cycle to maintain a stable output voltage. * **Switching MOSFET:** High-speed transistor that "chops" the DC voltage into high-frequency pulses. * **Power Transformer:** Provides galvanic isolation between the input (primary) and output (secondary) sides. #### C. Secondary Rectification & Feedback * **Schottky Diodes:** Used for high-frequency rectification of the transformer output. * **Filter Capacitors:** High-quality electrolytic capacitors to smooth ripples. * **Optocoupler:** Provides a feedback loop to the PWM controller while maintaining electrical isolation, ensuring output voltage stability. --- ### 3. Protection Features The SSL40C is engineered with several safety mechanisms to prevent damage to the connected electronics: 1. **Overvoltage Protection (OVP):** Shuts down the unit if the output voltage exceeds a safe threshold (typically 110-135% of nominal). 2. **Short Circuit Protection:** Features "Hiccup mode," where the power supply tries to restart periodically after a short is detected. 3. **Overload Protection:** Limits the current to prevent overheating and component failure. --- ### 4. Common Model Variations The SSL40C comes in different output configurations. Common examples include: | Model Number | Output Voltage | Max Current (Convection) | | :--- | :--- | :--- | | **SSL40C-7605** | 5.0 V | 8.0 A | | **SSL40C-7612** | 12.0 V | 3.3 A | | **SSL40C-7615** | 15.0 V | 2.7 A | | **SSL40C-7624** | 24.0 V | 1.7 A | ---