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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) 11 Page - Texas Instruments |
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LP8555 датащи(HTML) 11 Page - Texas Instruments |
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11 / 64 page  PWM Control Headroom Control Boost Converter Bank A Switching Frequency 500, 1000 kHz Oscillator Thermal Shutdown Reference Voltage LDO PWM Detector POR PWM Generator PWM & Current Dimming Control Fault Detection (Open LED, Over- current, Over-voltage) VBATT I 2C Slave Headroom Control PWM Control Switching Frequency 500, 1000 kHz EPROM ADCs for LED Current and PWM/ Boost Frequency Selection UVLO VDD VLDO SW_A FB_A GND_SW_A EN/VDDIO PWM/INT FSET/SDA ISET/SCLK RFSET RISET LED Current Sinks VBATT SW_B FB_B Boost Converter Bank B GND_SW_B LEDA1 LEDA2 LEDA3 LEDA4 LEDA5 LEDA6 LEDB1 LEDB2 LEDB3 LEDB4 LEDB5 LEDB6 LP8555 LP8555 www.ti.com SNVS857 – FEBRUARY 2014 8 Detailed Description 8.1 Overview The LP8555 is a white LED driver featuring an asynchronous boost converter and 12 high-precision current sinks that can be controlled by a PWM input signal, an I2C master, or both. The boost converter uses adaptive output voltage control for setting the optimal LED driver voltages as high as 28 V. This feature minimizes the power consumption by adjusting the voltage to the lowest sufficient level under all conditions. The converter can operate at two switching frequencies: 500 and 1000 kHz pre-configured via EPROM. Proprietary Hybrid PWM and Current Dimming mode allows higher system power saving. In addition, phase- shifted LED PWM dimming allows reduced audible noise and smaller boost output capacitors. The LP8555 has a full set of safety features that ensure robust operation of the device and external components. The set consists of input undervoltage lockout, thermal shutdown, overcurrent protection, four levels of overvoltage protection, and LED open and short detection. 8.2 Functional Block Diagram Copyright © 2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LP8555 |
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