Teardown Insight: Aishi Aluminum Electrolytic Capacitors Fill Every Critical Rail of Lenovo Legion 300W Laptop Adapter
2026-09-16 · Compiled by Best IT Parts from public industry reporting
Capacitor World's teardown of the Lenovo Legion ADL300SDC3A — a Delta-built 300W notebook adapter (100-240V input, 4.5A, 20V/15A output, 200.2 x 99.9 x 25.7mm, 868g) — maps three Aishi electrolytic series across the power train: three RH-series 450V units (120uF plus two 68uF, 256uF total) on the PFC high-voltage bus; one RJ-series 35V/220uF long-life part for auxiliary and control-circuit supply filtering; and six RZ-series 25V/470uF capacitors in parallel (2,820uF total) at the 20V/15A output, where paralleling both lifts ripple-current capability and supports transient load steps. The adapter uses fuse, X2 safety caps, common-mode chokes and bridge rectification into a PFC boost stage, followed by an LLC resonant converter with synchronous rectification, cooled by large aluminum heatsinks on both PCBA sides. A solid component benchmark for 300W-class laptop adapter designs and sourcing.
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Technical details are reproduced as reported. Verify specifications against the original source before design or procurement decisions.