### Overview of the TPS1663x Series The **TPS1663x** is a family of high-voltage eFuses (electronic fuses) developed by Texas Instruments. These integrated circuits are designed to provide robust protection for power lines in industrial and automotive applications, replacing traditional mechanical fuses or PPTCs. --- ### Key Features and Specifications | Parameter | Value / Range | | :--- | :--- | | **Operating Voltage ($V_{IN}$)** | 4.5 V to 60 V | | **Maximum Output Current ($I_{OUT}$)** | Up to 6 A | | **On-Resistance ($R_{DS(on)}$)** | ~31 mΩ | | **Adjustable Current Limit** | 0.6 A to 6 A via external resistor | | **Protection Features** | Overvoltage, Overcurrent, Short Circuit, Reverse Polarity | --- ### Internal Electronic Components & Functions The TPS1663x integrates several sophisticated blocks to manage power flow: #### 1. Power MOSFET The heart of the eFuse is a low $R_{DS(on)}$ N-channel MOSFET. This acts as the "switch" that disconnects the load if a fault is detected. Because it is integrated, it saves board space compared to discrete MOSFET solutions. #### 2. Current Sensing (Imon) Unlike traditional fuses that rely on heat, the TPS1663x uses an internal current-sense amplifier. The **IMON** pin provides an analog voltage proportional to the load current, allowing a microcontroller to monitor power consumption in real-time. #### 3. Protection Mechanisms * **Overvoltage Protection (OVP):** Using the **OVLO** pin, you can set a specific threshold. If the input voltage exceeds this, the device shuts off to protect the downstream load. * **Undervoltage Lockout (UVLO):** Ensures the device only operates when the input voltage is high enough for stable operation. * **Thermal Shutdown:** An internal temperature sensor shuts down the device if the silicon temperature exceeds safe limits (typically 150°C). #### 4. Control Logic (EN/UVLO Pin) This pin serves a dual purpose: it acts as a precision enable input and allows the user to program the Undervoltage Lockout threshold using a resistor divider. --- ### Comparison of Variants (TPS16630 vs TPS16632) | Feature | TPS16630 | TPS16632 | | :--- | :--- | :--- | | **Fault Response** | Latch-off (Stays off until reset) | Auto-Retry (Attempts to restart) | | **Reverse Polarity** | Integrated protection | Integrated protection | | **Best For** | Systems requiring manual intervention | Remote systems requiring uptime | --- ### Typical Application Circuit Example To use the TPS1663x, you typically need the following external passive components: ```c // External Components for TPS1663x 1. R_ILIM : Resistor from ILIM to GND (Sets the current limit) 2. R_OVLO : Resistor divider (Sets Overvoltage threshold) 3. C_dVdT : Capacitor from dVdT to GND (Controls output ramp rate/Soft Start) 4. C_IN : Input bypass capacitor (Minimizes voltage spikes) ```