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Load current sensing circuit for sensing load current of direct current converter, has simulation stage forming resistor proportional to time-averaged resistor, and measurement circuit measuring current flowing through resistor with voltage
Load current sensing circuit for sensing load current of direct current converter, has simulation stage forming resistor proportional to time-averaged resistor, and measurement circuit measuring current flowing through resistor with voltage
The circuit has a comparator stage (26) determining difference voltage between direct current (DC) components of pulse width modulation signals. An impedance simulation stage (28) forms a resistor that is proportional to a time-averaged resistor of high-level side and low-level side power transistors (T1, T2), which are connected in series between supply terminals. The determined difference voltage is applied to the impedance simulation stage. A measurement circuit (30) measures current flowing through the resistor of the impedance simulation stage with the difference voltage. An independent claim is also included for a method for sensing a direct current converter load current of a direct current converter.
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