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LP8550TLE/NOPB.A 数据表(PDF) 15 Page - Texas Instruments |
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LP8550TLE/NOPB.A 数据表(HTML) 15 Page - Texas Instruments |
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15 / 49 page  LP8550 www.ti.com SNVS657E – SEPTEMBER 2010 – REVISED SEPTEMBER 2014 8.3.2.12 Current Setting Maximum current of the LED outputs is controlled with CURRENT[7:0] EEPROM register bits linearly from 0 to 30 mA. If <EN_I_RES> = 1 the maximum LED output current can be scaled also with external resistor, RISET. RISET controls the LED current as shown in Equation 1: (1) Default value for CURRENT[7:0] = 7Fh (127d). Therefore, the output current can be calculated as shown in Equation 2: (2) For example, if a 16-k Ω RISET resistor is used, then the LED maximum current is 23 mA. Please note: formula is only approximation for the actual current. 8.3.2.13 PWM Frequency Setting PWM frequency is selected with PWM_FREQ[4:0] EEPROM register. If PLL clock frequency multiplication is used, the output PWM frequency is also affected. <PWM_RESOLUTION[1:0]> EEPROM bits select the PLL output frequency and hence the PWM frequency and resolution. Table 1 lists PWM frequencies with <EN_VSYNC]> = 0. PWM resolution setting effects the PLL clock frequency (5 MHz to 40 MHz). Highlighted frequencies with boldface can be selected also with external resistor RFSET. To activate RFSET frequency selection the <EN_F_RES> EEPROM bit must be 1. Table 1. Available PWM Frequencies and Resolutions PWM_RES[1:0] 00 01 10 11 PWM_FREQ[4:0] 5 MHz 10 MHz 20 MHz 40 MHz RESOLUTION (bits) 11111 19232 - - - 8 11110 16828 - - - 8 11101 14424 - - - 8 11100 12020 - - - 8 11011 9616 19232 - - 9 11010 7963 15927 - - 9 11001 6386 12771 - - 9 11000 4808 9616 19232 - 10 10111 4658 9316 18631 - 10 10110 4508 9015 18030 - 10 10101 4357 8715 17429 - 10 10100 4207 8414 16828 - 10 10011 4057 8114 16227 - 10 10010 3907 7813 15626 - 10 10001 3756 7513 15025 - 10 10000 3606 7212 14424 - 10 01111 3456 6912 13823 - 10 01110 3306 6611 13222 - 10 01101 3155 6311 12621 - 10 01100 3005 6010 12020 - 10 01011 2855 5710 11419 - 10 01010 2705 5409 10818 - 10 01001 2554 5109 10217 - 10 01000 2404 4808 9616 19232 11 00111 2179 4357 8715 17429 11 00110 1953 3907 7813 15626 11 Copyright © 2010–2014, Texas Instruments Incorporated Submit Documentation Feedback 15 Product Folder Links: LP8550 |
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