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LP8555 Datasheet(PDF) 40 Page - Texas Instruments |
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LP8555 Datasheet(HTML) 40 Page - Texas Instruments |
40 / 64 page LP8555 SNVS857 – FEBRUARY 2014 www.ti.com 8.5.12 VOLTAGE_0 Address: 0x16 D7 D6 D5 D4 D3 D2 D1 D0 VMAX ADAPT VINIT Bits Field Type Description Maximum boost voltage for Boost A (typical). 00 = 18V 7:6 VMAX R/W 01 = 22V 10 = 25V 11 = 28V 5 ADAPT R/W Enable adaptive headroom optimization. Initial boost voltage. When ADAPT is 0 the boost voltage will remain at the VINIT setting. The voltage 4:0 VINIT R/W range is from 7V to 28V; where 0x00 equals 7V and 0x3F equals 28V (typical). The VOLTAGE_0.VMAX bit sets the maximum allowed boost voltage for Boost A. The boost control loop will never request a higher voltage than the VMAX value. When the VOLTAGE.ADAPT bit is set to 1 the boost voltage may vary from 7V to the VMAX configured voltage. VINIT (DEC) Voltage (V) VINIT (DEC) Voltage (V) VINIT (DEC) Voltage (V) 0 7.00 11 14.45 22 21.91 1 7.68 12 15.13 23 22.58 2 8.35 13 15.8 24 23.26 3 9.03 14 16.48 25 23.94 4 9.71 15 17.16 26 24.61 5 10.39 16 17.84 27 25.29 6 11.06 17 18.52 28 25.97 7 11.74 18 19.2 29 26.65 8 12.42 19 19.87 30 27.32 9 13.09 20 20.55 31 28.00 10 13.77 21 21.23 Example: For system where is 7 LEDs in series with 2.9 V Vf. Target value for boost initial voltage would be: 7 x (2.9 V + 0.1 V) + 2 V = 23 V → VINIT = 24(DEC). 0.1 V represents Vf variation of single LED, and 2 V is worst case headroom. So it is desirable to set the initial voltage little higher than the actual Vf voltage to take the worst- case condition in consideration. 40 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: LP8555 |
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