EMP-Protected Drone Circuit Design
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Table
| Designator(s) | Component | Flux.ai Link | Function / Notes |
|---|---|---|---|
| U1 | LM2596 | LM2596 | Primary switching regulator (DC-DC) for main power conversion. |
| U2 | MCP1700-3302E/TO | MCP1700-3302E/TO | Low-dropout regulator (LDO), providing stable 3.3V to sensitive logic (e.g., MCU). |
| U3 | BQ24075RGTT | BQ24075RGTT | Battery management IC for charging and battery power-path control. |
| U4 | DRV8301 | DRV8301 | 3-phase motor driver for BLDC propulsion control, receiving signals from the MCU. |
| U5 | STM32F4 | STM32F4 | Main microcontroller for flight control and system logic. |
| PTC1 | PTC Resettable Fuse | PTC Resettable Fuse | Overcurrent protection. Placed in series with the battery input line to limit fault currents. |
| D1 | TVS Diode | TVS Diode | Clamps high-voltage transients (EMP/ESD surges) between battery line and ground. |
| F1 | EMI Filter | EMI Filter | Attenuates high-frequency noise at the battery input, after the PTC fuse. |
| X1 | 8MHz Crystal | 8MHz Crystal | Provides an external clock source for the STM32F4. |
| RS1 | Reset Supervisor | Reset Supervisor | Ensures the MCU resets predictably upon power-up/brown-out. |
| ESD1 | ESD Diode Array | ESD Diode Array | Provides additional ESD/EMP protection on sensitive I/O lines (e.g., MCU pins). |
| R6, R7, R8 | 10Ω Resistors | 10Ω Resistor | Series gate resistors for the DRV8301, limiting switching transients. |
| C(decoupling) multiple | 100nF Capacitors + 10µF Capacitors | 100nF capacitor, 10uF capacitor | Placed at regulator inputs/outputs, MCU supply pins, and motor driver supply pins to stabilize voltage, suppress high-frequency noise, and handle load transients (bulk decoupling). |
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