Ipkbl-sr 35w Schematic Repack -
IPKBL-SR/35W primary motherboard for the Dell OptiPlex 3050 All-in-One (AIO)
- AC Input Stage: The input stage includes a fuse, a varistor, and a bridge rectifier.
- DC-DC Converter: A high-frequency DC-DC converter provides the regulated output current.
- Control Circuitry: The control circuitry includes a microcontroller, a current sensing circuit, and a feedback loop.
Section 5: Where to Search for the Elusive OEM Schematic
| Rev | Date | Change | |------|------|--------| | 1.0 | 2024-01-15 | Initial release – IPKBL-SR 35W flyback with SR | | 1.1 | 2024-06-10 | Updated SR MOSFET gate resistor to 10Ω; added OTP | ipkbl-sr 35w schematic
- When the MOSFET turns off, the magnetic field in T1 collapses, transferring energy to the secondary winding.
- The secondary AC voltage is rectified by the Schottky diode (D2) and smoothed by the output capacitors.
- Feedback Loop: A voltage divider on the output feeds the TL431. The TL431 drives the PC817 optocoupler, which sinks current from the FB (Feedback) pin on the primary controller to regulate the duty cycle.
Power Controller:
Uses high-efficiency PWM controllers to maintain stability for the 35W "T" series processors. IPKBL-SR/35W primary motherboard for the Dell OptiPlex 3050