Circuit efficiency versus input voltage shows an increase in efficiency for increasing LED current and decreasing input voltage

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Other Materials from the Main Document

• Article «Switching regulator efficiently controls white-LED current»
• Figure 1. This circuit drives a high-current, white LED at 93% efficiency over input voltage and temperature. Potentiometer R₁ controls current through LED₁ and allows brightness adjustment. Diode D₁ provides temperature compensatio
• Figure 2. Circuit efficiency versus input voltage shows an increase in efficiency for increasing LED current and decreasing input voltage
• Figure 3. Current through the LED varies less than 3% over an operating- temperature range of 0 to 75 °C