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LM3435 Fiches technique(PDF) 9 Page - Texas Instruments |
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LM3435 Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 27 page RGB Current Regulator And Logic Control Gm Sample & Hold Comp Gm Gm MUX I 2 C Interface Logic 10 bit 10 bit 10 bit IGRN IBLU IRED Bias and Vref Gint Bint Rint Flyback Converter Control Logic Gint Bint Rint L.S. Driver H.S. Driver ON-timer OFF-timer VOUT RT EN PGND IREFR IREFB IREFG SCLK SDATA SVDD FAULT RCTRL BCTRL GCTRL GLED BLED RLED VIN SW GND CR CB CG SGND SENG,B,R SENG SENB SENR IREFG,B,R IREFG IREFB IREFR VREF Comp Comp Ch. Select VFB Feedback Sample & Hold Sample & Hold LM3435 www.ti.com SNVS724C – JUNE 2011 – REVISED MAY 2013 SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM OPERATION DESCRIPTION INTRODUCTION The LM3435 is a sequential LED driver for portable and pico projectors. The device is integrated with three high current regulators, low side MOSFETs and a synchronous flyback DC-DC converter. Only single LED can be enabled at any given time. The DC-DC converter quickly adjusts the output voltage to an optimal level based on each LED’s forward voltage. This minimizes the power dissipation at the current regulators and maximizes the system efficiency. The I2C compatible synchronous serial interface provides access to the programmable functions and registers of the device. I2C protocol uses a two-wire interface for bi-directional communications between the devices connected to the bus. The two interface lines are the Serial Data Line (SDA), and the Serial Clock Line (SCL). These lines should be connected to a positive supply, via a pull-up resistor and remain HIGH even when the bus is idle. Every device on the bus is assigned an unique address and acts as either a Master or a Slave depending on whether it generates or receives the serial clock (SCL). SYNCHRONOUS FLYBACK CONVERTER The LM3435 integrates a synchronous flyback DC-DC converter to power the three-channel current regulator. The LEDs are connected across VOUT of the flyback converter and VIN through an internal power MOSFET connecting to corresponding LED channel. The maximum current to LED is 2A and the maximum voltage across VOUT and VIN is limited at around 4.7V. The LM3435 integrates the main N-channel MOSFET, the synchronous P-channel MOSFET of the flyback converter and three N-channel MOSFETs as internal passing elements connecting to LED channels in order to minimize the solution components count and PCB space. Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM3435 |
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