The **LS100-15** is a 100W AC-DC enclosed switching power supply manufactured by TDK-Lambda. It is specifically designed to convert high-voltage alternating current (AC) into a stable 15V direct current (DC) output. --- ### 1. General Specifications | Feature | Parameter | | :--- | :--- | | **Output Voltage** | 15V DC | | **Maximum Output Power** | 100W | | **Maximum Current** | 7.0A | | **Efficiency** | ~85% | | **Input Voltage Range** | 88 - 264VAC (Universal) or 125 - 373VDC | --- ### 2. Key Electronic Components & Functions The LS100-15 utilizes a high-frequency switching architecture. Below are the primary internal sections: #### A. Input Stage (EMI & Rectification) * **Input Filter:** Consists of X and Y capacitors and a common-mode choke. This minimizes Electromagnetic Interference (EMI) both from the power line and generated by the unit itself. * **Bridge Rectifier:** Converts the incoming AC sine wave into a pulsating DC voltage. * **Bulk Capacitor:** A high-voltage electrolytic capacitor that smooths the rectified DC before it enters the switching stage. #### B. Control & Switching Stage * **PWM Controller IC:** The "brain" of the unit. It regulates the output voltage by adjusting the Pulse Width Modulation (PWM) duty cycle. * **Switching MOSFET:** Acts as a high-speed electronic switch (tens of kHz), chopping the DC voltage to pass through the transformer. #### C. Power Transformation & Isolation * **Main Transformer:** A ferrite-core transformer that provides galvanic isolation between the high-voltage input and the 15V output while stepping down the voltage. * **Optoisolator:** Provides feedback from the 15V output back to the PWM controller. This allows the controller to adjust for load changes while maintaining electrical isolation for safety. #### D. Output Stage (Rectification & Smoothing) * **Schottky Diodes:** These rectifiers convert the high-frequency AC from the transformer back into DC. They are chosen for their low forward voltage drop and fast switching speeds. * **Output Filter (L-C Circuit):** A combination of electrolytic capacitors and inductors that removes high-frequency ripples, ensuring a steady 15V supply to your equipment. --- ### 3. Protection Circuits The LS100-15 includes several electronic protection mechanisms to prevent damage: * **Overcurrent Protection (OCP):** Limits the output current if it exceeds ~105% of the rated 7A. * **Overvoltage Protection (OVP):** Shuts down the unit if the output voltage spikes (typically triggers between 17.3V and 21V). * **Thermal Protection:** Internal circuitry that throttles or shuts down the unit if temperatures exceed safe operating limits. --- ### 4. Mechanical & Connection Parts * **Terminal Block:** A 7-pin screw terminal usually configured as: * L, N (AC Input) * Ground (Earth) * -V, +V (15V Output) * **Potentiometer (V. ADJ):** A small trimmer resistor on the front panel that allows the user to fine-tune the output voltage (typically ±10%, approx. 13.5V to 16.5V).