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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LP55281TL/NOPB Datenblatt(PDF) 34 Page - Texas Instruments |
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LP55281TL/NOPB Datenblatt(HTML) 34 Page - Texas Instruments |
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34 / 42 page  1.0 7.8 14.6 21.4 28.2 35.0 LOAD CURRENT (mA) 90.0 74.0 58.0 42.0 26.0 10.0 Autoload ON Autoload OFF 90.0 74.0 58.0 42.0 26.0 10.0 34 LP55281 SNVS458D – JUNE 2007 – REVISED OCTOBER 2016 www.ti.com Product Folder Links: LP55281 Submit Documentation Feedback Copyright © 2007–2016, Texas Instruments Incorporated Figure 31. Efficiency at Low Load vs Autoload 8.3 Initialization Set Up Example The following table gives an example initialization sequence to illustrate the various LED and Boost configuration options. Not every feature of the LP55281 is configured in this example. Table 11. Initialization Example ADDRESS DATA REGISTER COMMENT 60h 00h RESET Execute software reset to initialize LP55281 00h 3Fh RED 1 IPLS = 0 (25% IRGB), PWM = 100% 01h 5Fh GREEN1 IPLS = 1 (50% IRGB), PWM = 50% 02h 90h BLUE1 IPLS = 2 (75% IRGB), PWM = 25.4% 03h C8h RED 2 IPLS = 3 (100% IRGB), PWM = 12.7% 04h 1Fh GREEN2 IPLS = 0 (25% IRGB), PWM = 50% 05h 10h BLUE2 IPLS = 0 (25% IRGB), PWM = 25.4% 06h 07h RED 3 IPLS = 0 (25% IRGB), PWM = 11.1% 07h 03h GREEN3 IPLS = 0 (25% IRGB), PWM = 4.8% 08h 01h BLUE3 IPLS = 0 (25% IRGB), PWM = 1.6% 09h 0h RED 4 IPLS = 0 (25% IRGB), PWM = 0% 0Ah 0h GREEN4 IPLS = 0 (25% IRGB), PWM = 0% 0Bh 0h BLUE4 IPLS = 0 (25% IRGB), PWM = 0% 0Fh 0Fh Boost Output Boost output voltage set to 4.7V 10h 07h Frequency Selections PWM frequency (FPWM[1:0] = 0, 9.92 kHz), Boost SW frequency = 2 MHz 11h CFh Enables NSTBY, EN_BOOST, EN_RGB4, EN_RGB3, EN_RGB2, EN_RGB1 = 1 (exit standby state, enable boost and rgb drivers) 9 Power Supply Recommendations The LP55281 is designed to operate from an input supply range of 2.7 V to 5.5 V. This input supply must be well regulated and able to provide the peak current required by the LED configuration without voltage drop under load transients (enable on/off). The resistance of the input supply rail should be low enough such that the input current transient does not cause the LP55281 supply voltage to droop more than 5%. Additional bulk decoupling located close to the input capacitor (CIN) may be required to minimize the impact of the input supply rail resistance. |
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