Reducing radiated EMI in WLED drivers
Most mobile phones use white LEDs (WLEDs) as the backlight for their displays. Li-Ion batteries with an output range of 2.7 to 4.2 V are the most common power source for mobile phones. Since several WLEDs in series, each with forward voltages around 3.6 V, are typically used for the backlight, the backlight driver must provide a voltage higher than the Li-Ion range. Therefore, an inductive boost converter is a common power-supply topology for WLED drivers.
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