The **FLCS-12A-R** is a high-performance, ultra-compact, non-isolated DC-DC point-of-load (POL) converter part of the **Fujitsu/FDK Senpai Series**. These modules are designed to provide a regulated output voltage from a wide range of input voltages, typically used in high-density networking and computing equipment. --- ## 1. Technical Specifications The following table summarizes the primary electrical characteristics of the FLCS-12A-R: | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 8.3V to 14.0V DC (Nominal 12V) | | **Output Voltage Range** | 0.75V to 5.0V DC (Adjustable) | | **Output Current** | 12 Amperes (Max) | | **Efficiency** | Up to 93% (at 12Vin, 5Vout) | | **Switching Frequency** | 300 kHz (Typical) | | **Mounting Type** | Surface Mount (SMD) | | **Isolation** | Non-isolated | --- ## 2. Key Electronic Components & Features The module integrates several sophisticated electronic sub-systems into a single SIP/SMT package: ### A. Power Train * **MOSFETs:** High-efficiency synchronous buck converter topology using low $R_{DS(on)}$ MOSFETs to minimize thermal loss. * **Inductor:** Integrated high-current power inductor designed for low EMI and high saturation levels. ### B. Control Circuitry * **Voltage Tracking:** Allows the output voltage to follow an external reference, useful for complex power sequencing. * **Remote On/Off:** Negative or Positive logic pins that allow the system to enable/disable the converter remotely. * **Voltage Margining:** Capability to adjust the output voltage slightly up or down to test system stability. ### C. Protection Mechanisms * **Over-Current Protection (OCP):** Automatically limits current or enters "hiccup mode" during a short circuit. * **Over-Temperature Protection (OTP):** Shuts down the device if internal temperatures exceed safe operating limits. * **Under-Voltage Lockout (UVLO):** Prevents the device from starting until the input voltage reaches a stable threshold. --- ## 3. Pin Configuration (Typical SMT) | Pin # | Name | Function | | :--- | :--- | :--- | | 1 | **Vout** | Output Voltage | | 2 | **Trim** | External resistor connection to set output voltage | | 3 | **GND** | Power and Signal Ground | | 4 | **Vin** | Input Voltage | | 5 | **On/Off** | Remote Control Pin | | 6 | **Sense** | Remote Sense (to compensate for voltage drops) | --- ## 4. Implementation Example To set the output voltage ($V_{out}$), an external resistor ($R_{trim}$) must be connected between the **Trim** pin and **GND**. ```python # Formula example for calculating Trim Resistor (R_trim) # R_trim = (10.5 / (Vout - 0.7525)) - 1.0 (kOhms) def calculate_trim(v_target): if v_target <= 0.7525: return "Open Circuit" r_trim = (10.5 / (v_target - 0.7525)) - 1.0 return round(r_trim, 3) # Example: To get 3.3V Output print(f"Required Resistor: {calculate_trim(3.3)} kOhms") ```