La-d401p Schematic | Repack

| Fault | Detection | Action | |-------|-----------|--------| | | Voltage across R7 exceeds threshold (≈0.2 V) | U4 forces Q1 OFF, LED1 ON | | Over‑Temperature | TMP1 voltage > set point (≈150 °C) | Same as above | | Under‑Voltage | Input drops below 10 V (detected by U3) | Driver held off until voltage recovers | | Reverse Polarity | D1 conducts in reverse | Prevents damage to downstream circuitry |

| Symbol | Description | Typical Part | |--------|-------------|--------------| | | Switching regulator (integrated boost) | LM3478‑type or custom ASIC | | L1 | Power inductor | 10 µH, 5 A ferrite | | D2 | Fast recovery diode (output) | 40 V, 5 A (e.g., SS34) | | C3 | Output filter capacitor | 47 µF, 10 V | | R1, R2 | Feedback divider (sets boost voltage) | 10 kΩ / 2 kΩ | | R3 | Current‑sense resistor (boost stage) | 0.05 Ω, 1 % | la-d401p schematic

“Figure 3 – Current‑Regulation Block” 5 A (e.g.