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When switch S is closed, the battery voltage is applied across the inductor L. Charging current flows through the inductor, building up a magnetic field, increasing as the switch is held closed. While the switch is closed, the diode D is reverse biased (open circuit) and current is supplied to the load by the capacitor C. Until the switch is opened, the inductor current willincrease linearly to a maximum value determined by the battery voltage, inductor value, and the amount oftime the switch is held closed (IMAX = VBAT/ L x TON). When the switch is opened, the magnetic field collapses, and the energy stored in the magnetic field is converted into a discharge current which fiows through the inductor in the same direction as the charging current. Because there is no path for current to flow through the switch, the current must flow through the switch, the current must fiow through the diode to supply the load and charge the output capacitor.
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