主权项 |
1. A method of determining output inductor current for a DC-DC switching regulator including a bypass switch coupling ends of an output inductor and an output capacitor, the output inductor having one end coupled to a node between a high side switch and a low side switch coupled in series and another end coupled to the output capacitor and a power load, comprising:
deactivating the bypass and low side switches and activating the high side switch when a bypass mode is disabled; determining a first change in capacitor voltage of the output capacitor over a first time period during which the bypass switch is deactivated; determining a first capacitor current value based on the first change in capacitor voltage, the first time period, and a capacitance of the capacitor; activating the bypass switch and deactivating the low and high side switches when the bypass mode is enabled; determining a second change in capacitor voltage of the output capacitor over a second time period during which the bypass switch is activated; determining a second capacitor current value based on the second change in capacitor voltage, the second time period, and the capacitance of the capacitor; and summing the first capacitor current value and the second capacitor current value to obtain an indication of output inductor current. |