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LP8555 Datasheet(PDF) 50 Page - Texas Instruments |
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LP8555 Datasheet(HTML) 50 Page - Texas Instruments |
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50 / 64 page  LP8555 SNVS857 – FEBRUARY 2014 www.ti.com 9.2.1.4.5 Boost Input Capacitor A ceramic capacitor with at least 10-V voltage rating is recommended for the boost input capacitor. If input voltage is higher, then the rating should be selected accordingly. The DC-bias effect can reduce the effective capacitance by up to 80%, which needs to be considered in capacitance value selection. Typically, a 10- μF capacitor per boost is sufficient. X5R/X7R are recommended types. 9.2.1.4.6 Diode A Schottky diode should be used for the output diode. Peak repetitive current should be greater than inductor peak current (3.1 A) to ensure reliable operation. Average current rating should be greater than the maximum output current. Schottky diodes with a low forward drop and fast switching speeds are ideal for increasing efficiency in portable applications. Choose a reverse breakdown voltage of the Schottky diode significantly larger (~40 V) than the output voltage. Do not use ordinary rectifier diodes, since slow switching speeds and long recovery times cause the efficiency and the load regulation to suffer. 9.2.1.5 Application Performance Plots Typical performance plots with default EPROM configuration. The LP8555EVM was used for taking the oscilloscope plots. VDD = 3.7V ILED = 25 mA 12 x 7 LEDs VDD = 3.7V VBOOST = 28V Load = 150 mA Figure 45. Start-up Waveform with I2C Write Figure 46. Typical Boost Waveform, Boost A Full Brightness Slope Function Disabled. VDD = 3.7V fSW = 1 MHz ƒPWM = 19.5 kHz 6 Strings Figure 47. 180° Phase Difference Between Boost A and B Figure 48. Typical LED Current and Voltage Waveforms. 50 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: LP8555 |
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