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LM3435 Fiches technique(PDF) 9 Page - Texas Instruments

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No de pièce LM3435
Description  Compact Sequential Mode RGB LED Driver with I2C Control Interface
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

LM3435 Fiches technique(HTML) 9 Page - Texas Instruments

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background image
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
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