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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LP8555 датащи(PDF) 1 Page - Texas Instruments |
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LP8555 датащи(HTML) 1 Page - Texas Instruments |
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1 / 64 page  LP8555 SW_A FB_A VLDO GNDs EN/VDDIO ISET/SCL PWM/INT LEDA1 LEDA2 LEDA3 LEDA4 LEDB3 LEDB4 L1 D1 7 - 28V 2.7V ± 20V CVLDO VDD VBATT FSET/SDA LEDB5 LEDB6 SW_B FB_B L2 D2 2.7V ± 20V VBATT LEDA5 LEDA6 LEDB1 LEDB2 1.3 9OUT / VIN 10 VOUT_A 7 - 28V 1.3 9OUT / VIN 10 VOUT_B CVDD EN SDA SCL VDDIO RPULL-UP INT RPULL-UP LCD Display COUT_A CIN_A COUT_B CIN_B 80 82 84 86 88 90 92 0 20 40 60 80 100 Brightness (%) VIN = 3.0 V VIN = 3.7 V VIN = 4.2 V VIN = 5.4 V VIN = 7.4 V VIN = 8.4 V C002 Inductor: IHLP2525CZER6R8M01 Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LP8555 SNVS857 – FEBRUARY 2014 LP8555 High-Efficiency LED Backlight Driver for Tablet PCs 1 Features 3 Description The LP8555 is a high efficiency LED driver with 1 • Dual High-Efficiency DC/DC Boost Converters integrated dual DC-DC boost converters. It has 12 • 2.7-V to 20-V VDD Range high-precision current sinks that can be controlled by • 12 50-mA High-Precision LED Current Sinks With a PWM input signal, an I2C master, or both. 12-Bit Brightness Control Dual-boost configuration of LP8555 shares the load • Adaptive LED Current Sink Headroom Controls for to two inductors and allows thinner overall solution Maximum System Efficiency size and better efficiency compared to single-boost solutions. 12 LED strings allows driving high number • LED String Count Auto-Detection of LEDs with optimal efficiency since boost • Phase-Shifted PWM Mode for Reduced Audible conversion ratio can be kept low. Noise The boost converter has adaptive output voltage • PWM Input Duty-Cycle and/or I2C-Register control based on the LED current sink headroom Brightness Control voltages. This feature minimizes the power • Hybrid PWM and Current Dimming for Higher LED consumption by adjusting the voltage to lowest Drive Optical Efficiency sufficient level in all conditions. • Flexible CABC Support The LED string auto-detect function enables use of • EPROM, I2C-Register, or External Resistors for the same device in systems with 2 to 12 LED strings Configuration for the maximum design flexibility. Proprietary Hybrid PWM and Current dimming mode enables additional • Improved Boost EMI Performance with Slew-Rate system power savings. Phase-shift PWM allows Control, Spread Spectrum, and Phase-Shifted reduced audible noise and smaller boost output Switching capacitors. Flexible CABC support combines • Extensive Fault Detection Schemes brightness level selections based on the PWM input and I2C commands. 2 Applications Device Information • Tablet LCD Display LED Backlight ORDER NUMBER PACKAGE BODY SIZE LP8555YFQR DSBGA (36) 2,478mm x 2,478mm 4 Simplified Schematic LED Drive Efficiency 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
Аналогичный номер детали - LP8555 |
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Аналогичное описание - LP8555 |
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