降低WLED驱动器中辐射EMITexas Instruments Incorporated Power Management Reducing radiated EMI in WLED drivers By Jeff Falin Senior Applications Engineer Most mobile phones use white LEDs (WLEDs) as the strength of a capacitor is directly proportional to its capac- backlight for their displays. Li-Ion batteries with an output itance and the voltage across its terminals. The capacitance range of 2.7 to 4.2 V are the most common power source is inversely proportional to the distance between the termi for mobile phones. Since several WLEDs in series, each nals. Ideally, the IC and components are laid out on the with forward voltages around 3.6 V, are typically used for board to mini……