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A single ended primary inductor converter (SEPIC) converter based light emitting diode (LED) power supply, which can achieve power factor correction (PFC) and constant-current driver for the LED in the critical conduction mode, is presented in this paper. The circuit principle is described in detail. Meanwhile the formulas for metal-oxide semiconductor field-effect transistor (MOSFET) switch-on time, switching frequency and the main influences of power factor are given. Experimental resultsdoi:10.1587/elex.11.20140576 fatcat:xomz6kmuqfgb5fmmadxhxup6cq