Teardown: AcBel PCB033 280W OEM ATX Power Supply for Lenovo Commercial Desktops
2026-09-15 · Compiled by Best IT Parts from public industry reporting
Chongdiantou tears down the AcBel PCB033, a 280W OEM ATX supply built for Lenovo commercial desktops — 150 x 140 x 86mm, 1,122g, 100-240V wide-range input, CCC certified, with a customised 14-pin mainboard connector and 4-pin CPU feed (2 x 16A on 12V rails, 5.08VSB/2.5A standby). The single-sided PCBA uses a Champion Micro CM6800T combo controller driving active PFC and a dual-switch forward PWM stage, with a TNY288PG auxiliary standby controller, Weltrend WT7578T supervisory IC and an onsemi LM339DG quad comparator handling protection and monitoring. Power devices include an Infineon IPP60R280E6 PFC MOSFET, an ST STTH8S06D boost diode, a Toshiba TK10A60D forward switch, and Diodes MBR20100CT plus ST STPS20S100CT output rectifiers. Filtering relies on Elite, Chemi-Con, Rubycon, Nichicon and Aishi capacitors, cooled by a Protechnic MGA8012HR-A25 dual-ball-bearing fan. A detailed OEM cost-structure benchmark for PSU component sourcing.
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Technical details are reproduced as reported. Verify specifications against the original source before design or procurement decisions.