### Technical Overview: CTX68-4-R Inductor The **CTX68-4-R** is a high-performance, surface-mount (SMD) power inductor part of the **OCTA-PAC® PLUS** series manufactured by **Eaton (formerly Coiltronics)**. It is specifically designed as a dual-winding toroidal inductor, allowing it to be used in various circuit configurations. --- ### 1. Key Technical Specifications | Parameter | Specification | |:---|:---| | **Inductance (Parallel)** | 67.3 µH | | **Inductance (Series)** | 269.4 µH | | **Current Rating (Parallel)** | 1.15 A | | **DC Resistance (DCR) Max** | 0.283 Ω (Parallel) | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD) | | **Package / Case** | Size 4 (Approx. 15.0mm x 12.0mm) | --- ### 2. Design Features * **Dual Winding Construction:** It features two separate windings on a single core. This provides the flexibility to connect the windings in **series** (for higher inductance) or in **parallel** (for higher current capacity). * **Toroidal Core:** The use of a toroidal (ring-shaped) core helps in self-shielding, significantly reducing Electromagnetic Interference (EMI) and flux leakage. * **High Power Density:** The OCTA-PAC® PLUS series is engineered for high-density applications where space is limited but power requirements are high. * **Materials:** Built using a high-temperature powdered iron core material, making it suitable for automotive and industrial environments. --- ### 3. Common Applications The CTX68-4-R is primarily found in power conversion circuits, including: 1. **DC-DC Converters:** Used in Buck, Boost, and Forward converters. 2. **SEPIC Converters:** Because of the dual windings, it is an ideal component for Single-Ended Primary-Inductor Converters. 3. **1:1 Transformers:** It can be used as a 1:1 isolation transformer or a common-mode choke. 4. **Filtering:** Effective in input/output filter circuits to smooth out current ripples. --- ### 4. Circuit Implementation Example ```cpp // Connecting Windings Logic if (Configuration == "Series") { Inductance = 4 * Base_Inductance; // ~269.4 uH Current_Limit = Base_Current / 2; } else if (Configuration == "Parallel") { Inductance = Base_Inductance; // ~67.3 uH Current_Limit = Base_Current; // 1.15 A } ``` ---