降低WLED驱动器中辐射EMI

降低WLED驱动器中辐射EMI

Texas 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