The **FP0708R1-R15-R** is a high-current, shielded drum core power inductor manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). It is part of the FP0708 series, specifically designed for high-frequency voltage regulator modules (VRMs). ### 1. Part Number Breakdown Understanding the nomenclature helps identify the component's specific characteristics: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **FP** | Series Name | Flat-Pac (High current, low profile) | | **0708** | Size Dimensions | Approx. 7.2mm x 8.2mm footprint | | **R1** | Revision/Variation | Design revision indicator | | **R15** | Inductance Value | **0.150 µH** (150 nanohenries) | | **-R** | RoHS Compliance | Lead-free and compliant with environmental standards | --- ### 2. Technical Specifications This component is engineered for applications where extremely high current and high efficiency are required in a small space. * **Inductance (L):** 150 nH (±10%) * **Full Load Current ($I_{sat}$):** Typically around **52A to 72A** (Saturation current where inductance drops by 20%). * **Heating Current ($I_{rms}$):** Typically **40A to 50A** (Current causing a 40°C temperature rise). * **DC Resistance (DCR):** Extremely low, typically around **0.42 mΩ** (milliohms). * **Operating Temperature:** -40°C to +125°C. --- ### 3. Key Features and Applications The FP0708R1 series is built using a ferrite core material that provides low core losses at high frequencies. #### Physical Characteristics - **Shielded Construction:** Minimizes EMI (Electromagnetic Interference) with surrounding components. - **Surface Mount (SMD):** Designed for automated pick-and-place assembly. - **Vertical Orientation:** The "Flat-Pac" design optimizes airflow in server environments. #### Typical Applications 1. **Multi-phase Buck Regulators:** Used in CPU/GPU power stages. 2. **Voltage Regulator Modules (VRMs):** Found on high-end motherboards and server blades. 3. **Data Center Infrastructure:** Powering ASICs and FPGAs. 4. **Point-of-Load (POL) Converters:** High-density power supplies. --- ### 4. Schematic Representation In a circuit diagram, the part is represented as a standard power inductor, often positioned between the switching MOSFETs and the output capacitors. ```spice * Typical Buck Converter Implementation VIN ---- [MOSFET High Side] ----+---- [FP0708R1-R15-R] ---- VOUT (Core Rail) | (0.15uH) [MOSFET Low Side] | GND ``` ---