: The "F" in the part number typically denotes a fuse component that protects the circuit without needing manual replacement after a fault. Status Indicators : Modern schematics for this board often include a status LED
28V to 48V DC Output: 24V DC @ 1.1A Efficiency: ~88%
): 1.1A. This is the maximum current the device can safely carry without tripping at room temperature. Voltage Rating ( Vmaxcap V sub m a x end-sub f4901 1.1a 24v schematic
After analyzing three different PCB revisions (common in Chinese industrial supplies), here is the . Note that component labels (R1, C2, etc.) are generic, but values are specific to the 24V/1.1A output.
If your schematic is correct but the circuit isn't powering on: : The "F" in the part number typically
The F4901 1.1A 24V schematic refers to a specific electronic circuit design, likely used in power supply or voltage regulation applications. In this write-up, we will provide a detailed overview of the F4901 1.1A 24V schematic, including its components, functionality, and potential applications.
| Component | Value/Rating | Function in the F4901 | | :--- | :--- | :--- | | | 1.5A / 250V | Input protection. If blown, check bridge rectifier and MOSFET Q1. | | C2 | 100µF / 400V | Bulk capacitor. High ESR here causes 100Hz ripple and overheating. | | R2 | 150kΩ (1W) | Startup resistor. If open, the IC never starts. | | Q1 | 4N60 (4A, 600V N-MOS) | Primary switching transistor. Known failure point. | | R3 | 0.68Ω (1%) | Current sense resistor. If value drifts >10%, output current limit changes. | | T1 | EE19 or EE22 core | Transformer. Turns ratio: Primary:Vcc:Secondary = 100:15:12 (approx). | | D1 | SB3100 (3A, 100V) | Output rectifier. Must be ultrafast or Schottky. | | C3 | 470µF / 35V (Low ESR) | Output filter. Failure causes 24V rail noise. | | U3 | TL431 | Precision shunt regulator. Sets output to 24V via R5/R6 divider. | Voltage Rating ( Vmaxcap V sub m a
The component is designed for low-voltage power rail protection with the following primary ratings: 24V24 cap V Hold Current ( Iholdcap I sub h o l d end-sub ): 1.1A1.1 cap A Package Type: Surface Mount Device (SMD) Material Property: Lead-free/Green process ( GP ) 3. Schematic Integration & Function
Depending on whether the F4901 acts as a regulator or a controller, this block manages the energy.