A standard 35W schematic of this type is centered around a high-efficiency switching controller, often using a Pulse Width Modulation (PWM) IC to manage power delivery while minimizing heat. Input Stage:
This board is designed for business-critical performance in a compact footprint. Socket Type : LGA 1151. Processor Support
: Used in air purifiers or specialized consumer electronics.
| Component | Typical Value | Function | Common Failure Mode | | :--- | :--- | :--- | :--- | | | 1A - 1.6A, 250V | Short-circuit protection | Open (blown) | | Bridge Diode | KBP206 or MB6S | AC to DC rectification | Short or high leakage | | Main Cap C1 | 68µF - 100µF / 400V | Smooth DC bus | Bulging, loss of capacitance | | PWM IC | LD7575, OB2263, AP3842 | Switching control | No VCC, no output | | MOSFET Q1 | 4N60, 6N60 (600V) | High-speed switching | Shorted D-S, open G | | Current Sense R | 0.33Ω - 0.68Ω (2W) | Overcurrent protection | Cracked, increased value | | Optocoupler | PC817C | Isolates feedback | Low CTR (leads to output flutter) | | TL431 | TO-92 package | Voltage reference | Shorted or open (wrong voltage) | | Output Caps | 1000-2200µF 25V | Smooth DC output | ESR high, bulging |