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LP8556 Datasheet(PDF) 19 Page - Texas Instruments |
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LP8556 Datasheet(HTML) 19 Page - Texas Instruments |
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19 / 63 page  PWM CONTROL CURRENT CONTROL 25% 100% Max current is set with CURRENT and CURRENT_MAX EPROM bits or CURRENT and CURRENT_MAX EPROM bits and RISET resistor 25% 50% 100% PWM & CURRENT CONTROL with Switch Point at 25% of ILED_MAX (PWM_TO_I_THRESHOLD = 0111b) BRIGHTNESS 50% 19 LP8556 www.ti.com SNVS871I – JULY 2012 – REVISED MARCH 2016 Product Folder Links: LP8556 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated (1) See CFG0. 8.3.2.5.3 Adaptive Control Adaptive dimming control combines PWM Control and Pure Current Control dimming methods. With the adaptive dimming, it is possible to achieve better optical efficiency from the LEDs compared to pure PWM control while still achieving smooth and accurate control at low brightness levels. Current resolution in this mode is 12 bits. Switch point from Current to PWM control can be set with the PWM_TO_I_THRESHOLD EPROM field from 0% to 100% of the brightness range to get good compromise between good matching of the LEDs brightness/white point at low brightness and good optical efficiency. PWM frequency is set either using an external set Resistor (RFSET) or using the PWM_FREQ EPROM bits. The maximum LED current is set either by using an external set Resistor (RISET), CURRENT, and CURRENT_MAX EPROM bits. Or the maximum LED current may be set using the CURRENT and CURRENT_MAX EPROM bits. Figure 10. Adaptive Output Dimming Scheme 8.3.2.6 Setting Full-Scale LED Current The maximum or full-scale LED current is set either using an external set Resistor (RISET), CURRENT, and CURRENT_MAX EPROM bits or just by using the CURRENT and CURRENT_MAX EPROM bits. Table 3 summarizes setting of the full-scale LED current. Table 3. Setting Full-Scale LED Current RISET [Ω] ISET_EN CURRENT_MAX CURRENT[11:0] FULL-SCALE ILED [mA] don't care 0 000 FFFh 5 don't care 0 001 FFFh 10 don't care 0 010 FFFh 15 don't care 0 011 FFFh 20 don't care 0 100 FFFh 23 don't care 0 101 FFFh 25 don't care 0 110 FFFh 30 don't care 0 111 FFFh 50 don't care 0 000 - 111 001h - FFFh See(1) 24k 1 000 FFFh 5 24k 1 001 FFFh 10 24k 1 010 FFFh 15 24k 1 011 FFFh 20 24k 1 100 FFFh 23 24k 1 101 FFFh 25 24k 1 110 FFFh 30 24k 1 111 FFFh 50 12k - 100k 1 000 - 111 001h - FFFh See(1) |
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