The **AP43771FBZ-13-FZ95** is a highly integrated **USB Type-C Power Delivery (PD) Controller** manufactured by Diodes Incorporated. It is specifically designed to manage power negotiation and supply between power sources (like wall adapters) and sink devices (like smartphones or laptops). --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Diodes Incorporated | | **Protocol Support** | USB PD 3.0 (PPS), QC4/4+, QC5 | | **Operating Voltage** | 3.3V to 24V | | **Package Type** | V-QFN4040-24 | | **Control Interface** | I2C (Inter-Integrated Circuit) | | **Protection Features** | OVP, UVP, OCP, SCP, OTP | --- ### 2. Core Functional Blocks The internal electronic architecture consists of several critical stages: 1. **PD PHY (Physical Layer):** Handles the BMC (Biphase Mark Coding) signaling over the CC1/CC2 lines to communicate with the connected device. 2. **Protocol Engine:** A digital logic block that manages the "handshaking" process, ensuring both the charger and the device agree on a specific voltage (e.g., 5V, 9V, 15V, 20V). 3. **Gate Drivers:** Integrated circuitry designed to drive external N-channel MOSFETs, which act as switches to turn the power output on or off safely. 4. **ADC (Analog-to-Digital Converter):** Monitors voltage and current in real-time to provide feedback for the Programmable Power Supply (PPS) features. --- ### 3. Application Circuit Components To function in a real-world electronic design, the AP43771 requires the following surrounding parts: * **Sense Resistor:** Used to measure output current for OCP (Overcurrent Protection). * **N-Channel MOSFETs:** Act as the "Load Switch" to isolate the output connector from the power source until negotiation is successful. * **Decoupling Capacitors:** Usually 0.1μF or 1μF placed near the VCC and VIN pins to filter high-frequency noise. * **CC Line Resistors:** Internal or external pull-up/pull-down resistors to detect cable orientation. --- ### 4. Why the "FZ95" Suffix? The specific suffix **-FZ95** typically refers to a custom firmware version or a specific packaging/reeling variant. In PD controllers, the firmware determines: * Default power profiles (e.g., max wattage). * Specific vendor-defined messages (VDMs). * Behavior when a non-PD compliant cable is detected. --- ### 5. Common Use Cases * **USB-C Fast Chargers:** AC/DC adapters ranging from 18W to 100W+. * **Power Banks:** Managing both charging the battery and discharging to a phone. * **Car Chargers:** Converting 12V automotive power to PD-compliant outputs.