Ipkbl-sr 35w Schematic __full__ Guide

IPKBL-SR/35W

The is a proprietary Dell All-In-One (AIO) motherboard specifically used in the OptiPlex 3050 AIO series. While a full manufacturer schematic (circuit-level blueprint) is typically restricted to authorized repair centers, the technical architecture and component layout are well-documented for maintenance and upgrades. 🛠️ Technical Specifications

• AC In -> fuse -> EMI filter -> bridge -> bulk cap -> DC bus
• DC bus -> primary of HF-transformer via switching MOSFET and current-sense resistor
• Transformer secondary -> Schottky diode(s) -> output caps -> output
• Output feedback: TL431 -> optocoupler -> controller on primary
• Auxiliary winding -> regulator -> Vcc to controller
• Snubber/clamp on primary to limit spikes

2. Key Specifications (Derived from Schematic Analysis)

• The Switching IC (Let's call it U1) generates a 60-100 kHz square wave at its OUT pin.
• This drives the Gate of the MOSFET via a 10-22 Ohm resistor.
• Current Sensing: A low-value, high-wattage resistor (0.33 Ohm to 1 Ohm) between the Source of the MOSFET and primary ground provides overcurrent protection to the CS pin of U1.