Teardown: LITEON PS-2551-5L 550W CRPS Platinum Server PSU — SiC PFC and TI Digital Control
2026-09-17 · Compiled by Best IT Parts from public industry reporting
Chongdiantou tears down the LITEON PS-2551-5L, a CRPS-185 form-factor 550W redundant server supply rated 80 PLUS Platinum: 100-240V AC or 240Vdc HVDC input, +12V/45A and +12Vsb/3A output, 185 x 73.5 x 40.7mm, ~850g, certified to CCC, KC, FCC, CE and EAC. Topology is digital PFC plus LLC resonant conversion plus secondary synchronous rectification. PFC rectification uses an Infineon IDH04G65C5 650V/4A SiC Schottky diode to cut reverse-recovery loss — the key to Platinum efficiency — switched by an onsemi FCP260N60E (600V/260mR) driven by a TI UCC27511DBVT. Control is split: a Microchip dsPIC33FJ16GS502 runs the PFC boost loop, while a TI UCD3138064 digital controller handles LLC frequency modulation, SR timing and PMBus management. LLC switches are Infineon IPP65R190CFD (700V/190mR); output rectification uses four Toshiba TPH2R306NH 30V/1.9mR MOSFETs with ST PM8834 drivers. Bulk filtering is a Chemi-Con 450V/470uF electrolytic; the output combines five Chemi-Con PSF 16V/470uF polymer capacitors with KZE 16V/2200uF long-life parts. Standby runs on a TI UCC28610 flyback plus ST STD7NM80, cooled by a MinebeaMitsumi 4028 fan.
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Technical details are reproduced as reported. Verify specifications against the original source before design or procurement decisions.