## Overview of the IQL48060A033V-003-R The **IQL48060A033V-003-R** is a high-performance, isolated DC-DC converter module, part of the **iQL Series** manufactured by **TDK-Lambda**. It is designed in a standard "Quarter-Brick" footprint and is optimized for telecommunications, data communications, and computing applications. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Form Factor** | Quarter-Brick (approx. 57.9 x 36.8 x 12.7 mm) | | **Input Voltage Range** | 36V to 75V DC (48V Nominal) | | **Output Voltage** | 3.3V DC | | **Maximum Output Current** | 60A | | **Maximum Output Power** | 198W | | **Efficiency** | Up to 90% | | **Isolation Voltage** | 1500V DC (Input to Output) | | **Control Logic** | Negative Logic (Remote On/Off) | --- ### 2. Electronic Sub-Systems and Components The module is a sophisticated Power Management Integrated Circuit (PMIC) assembly. Internally, it consists of several key electronic sections: #### A. Input Section * **EMI Filter:** Includes capacitors and inductors to reduce conducted electromagnetic interference. * **Undervoltage Lockout (UVLO):** Ensures the converter only operates when the input voltage is within a safe, functional range (typically >34V). #### B. Power Conversion Stage (Topology) * **Synchronous Rectification:** Instead of standard diodes, this part uses low $R_{DS(on)}$ MOSFETs to rectify the output. This significantly reduces heat dissipation and boosts efficiency to 90%. * **Magnetic Isolation:** Uses a high-frequency transformer to provide 1500V galvanic isolation between the noisy 48V input bus and the sensitive 3.3V load. #### C. Control and Protection Circuitry * **PWM Controller:** A high-speed controller manages the switching frequency and duty cycle to maintain a steady 3.3V output regardless of load changes. * **Remote Sense:** Includes "Sense+" and "Sense-" pins to compensate for voltage drops across the PCB traces between the converter and the load. * **Trim Function:** Allows the user to adjust the output voltage slightly (usually +/- 10%) via an external resistor. --- ### 3. Pinout Configuration The "Quarter-Brick" standard usually follows this pin layout: 1. **Vin (+):** Positive Input 2. **ON/OFF:** Remote Control (Negative Logic: Low = On) 3. **Vin (-):** Negative Input 4. **Vout (-):** Negative Output 5. **Sense (-):** Remote Sense Negative 6. **Trim:** Output Voltage Adjustment 7. **Sense (+):** Remote Sense Positive 8. **Vout (+):** Positive Output --- ### 4. Safety and Environmental Features * **Thermal Protection:** Internal thermal sensors trigger a shutdown if the module exceeds safe operating temperatures (Over-Temperature Protection). * **OCP & OVP:** Includes Over-Current and Over-Voltage Protection to prevent damage to the connected electronics. * **RoHS Compliant:** The "-R" suffix indicates compliance with the Restriction of Hazardous Substances directive. ---