FSP 2000W CRPS Server PSU Teardown: Eight APAQ Solid Capacitors Across the 12V Output Path
2026-09-30 · Compiled by Best IT Parts from public industry reporting
A teardown of the FSP2000-20FM, a 2000W CRPS server power supply, identifies eight APAQ solid-state capacitors distributed through its low-voltage output filtering. The unit follows the CRPS-185 form factor and reaches its full 2000W at 220-240V AC or 240V DC input, with a 12V main rail rated 163.6A and 80 PLUS Platinum conversion efficiency. The power stage uses a PFC front end followed by a phase-shifted full bridge and synchronous rectification.
Two 1000uF 16V APAQ capacitors sit directly beneath the main transformer, adjacent to the secondary power loop, where they work with the downstream filter network to smooth the rectified output. After the synchronous rectifier, the main output section carries multiple 1200uF 16V APAQ capacitors that combine with the output inductor to suppress ripple on the 12V bus and buffer short-term energy demand during fast server load swings - the critical function at a 163.6A, low-voltage, high-current output. A 2200uF 16V capacitor in the same area was not attributed to a brand in the original teardown and is therefore not counted in the APAQ tally.
The remaining APAQ parts sit on auxiliary rails. A third 1000uF 16V capacitor follows the Schottky rectifier on the standby transformer secondary, filtering the 12Vsb/3A standby output, while a 470uF 16V device is mounted on the control daughter board that hosts the PFC controller, phase-shifted full-bridge controller, op-amps and buck converters, stabilising the low-voltage supply for the digital and analogue control circuits.
For buyers specifying replacement parts, the teardown indicates the capacitance and voltage set a 2kW-class CRPS platform relies on at the low-voltage side: 1000uF, 1200uF and 470uF parts at 16V, selected for ESR, ripple-current capability and long-term stability.
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Technical details are reproduced as reported. Verify specifications against the original source before design or procurement decisions.