 |
数据搜索系统，热门电子元器件搜索 |
|
|
数据搜索系统，热门电子元器件搜索 |
|
LP8550TLE/NOPB 数据表(PDF) 16 Page - Texas Instruments |
|
|
|
|||||||||||||||||||||||||||||
LP8550TLE/NOPB 数据表(HTML) 16 Page - Texas Instruments |
|
|
16 / 49 page  OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 tSHIFT = 1/(FPWM x 6) Shift time 1/(FPWM) Cycle time LP8550 SNVS657E – SEPTEMBER 2010 – REVISED SEPTEMBER 2014 www.ti.com Table 1. Available PWM Frequencies and Resolutions (continued) PWM_RES[1:0] 00 01 10 11 PWM_FREQ[4:0] 5 MHz 10 MHz 20 MHz 40 MHz RESOLUTION (bits) 00101 1728 3456 6912 13823 11 00100 1503 3005 6010 12020 11 00011 1202 2404 4808 9616 12 00010 1052 2104 4207 8414 12 00001 826 1653 3306 6611 12 00000 601 1202 2404 4808 13 RFSET resistance values with corresponding PWM frequencies: Table 2. PWM Frequency Selection with Resistor PWM_RES[1:0 00 01 10 11 ] RFSET (k Ω) 5 MHz CLOCK RESOLUTION 10 MHz RESOLUTION 20 MHz RESOLUTION 40 MHz RESOLUTION CLOCK CLOCK CLOCK 10...15 19232 8 19232 9 19232 10 19232 11 26...29 16828 8 15927 9 16227 10 17429 11 36...41 14424 8 12771 9 14424 10 15626 11 50...60 12020 8 9616 10 12020 10 12020 11 85...100 9616 9 8715 10 9616 11 9616 12 135...150 7963 9 7813 10 7813 11 8414 12 200...300 6386 9 6311 10 6010 11 6811 12 450... 4808 10 4808 11 4808 12 4808 13 8.3.2.14 Phase Shift PWM (PSPWM) Scheme Phase shift PWM scheme allows delaying the time when each LED output is active. When the LED output are not activated simultaneously, the peak load current from the boost output is greatly decreased. This reduces the ripple seen on the boost output and allows smaller output capacitors. Reduced ripple also reduces the output ceramic capacitor audible ringing. PSPWM scheme also increases the load frequency seen on boost output by x6 and therefore transfers the possible audible noise to so high frequency that human ear cannot hear it. Description of the PSPWM mode is seen in Figure 14. PSPWM mode is enabled by setting <EN_PSPWM> EEPROM bit to 1. Shift time is the delay between outputs and it is defined as 1 / (fPWM x 6). If the <EN_PSPWM> bit is 0, then the delay is 0 and all outputs are active simultaneously. Figure 14. Phase Shift PWM Mode 16 Submit Documentation Feedback Copyright © 2010–2014, Texas Instruments Incorporated Product Folder Links: LP8550 |
|
链接网址 |
| ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 数据表链接 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Chinese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
