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LM3549 Fiches technique(PDF) 9 Page - Texas Instruments

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No de pièce LM3549
Description  High Power Sequential LED Driver
Download  25 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

LM3549 Fiches technique(HTML) 9 Page - Texas Instruments

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background image
R_EN
G_EN
B_EN
R_OUT
G_OUT
B_OUT
GREEN
RED
R_EN
G_EN
B_EN
BLUE
GREEN
RED
GREEN
RED
BLUE
GREEN
RED
7.5%
11%
12.5%
7.5%
12.5%
7.5%
11%
12.5%
7.5%
12.5%
60 Hz
LM3549
www.ti.com
SNVS640A – AUGUST 2010 – REVISED MAY 2013
OPERATION DESCRIPTION
LM3549 is a sequential LED driver for portable video projectors. It has three high current low side drivers and a
buck-boost DC-DC converter. Only single LED can be enabled at any given time. DC-DC converter quickly
adjusts the output voltage to a suitable level based on each LED’s forward voltage. This minimizes the power
dissipation at the drivers and maximizes the system efficiency.
Figure 15 shows a typical timing of a portable video projector light source. Each frame is divided into 10
individual color sequences. White balance is achieved by adjusting the driver currents.
Timing of LM3549 depends solely on the R_EN, G_EN and B_EN inputs. Each driver’s current is set with I2C
registers and current levels can be stored to internal EEPROM. After correct current values are stored to
EEPROM LM3549 can be used in application without I2C interface.
Full frame
1/60Hz
16.66 ms
Red
Full frame x 7.5%
1.25 ms
Green
Full frame x 11%
1.822 ms
Blue
Full frame x 12.5%
2.08 ms
Figure 15. Timing Chart
CONTROL INTERFACE
Even though each driver has its own control input only one driver can be enabled at any given time. If second
control is pulled high while previous color is active second output won’t be enabled until the first input is pulled
low. This can be seen on Figure 16. G_EN is pulled high while R_EN is still high. G_OUT is not activated until
R_EN is pulled low. Next B_EN and R_EN are both pulled high while G_EN is high. When G_EN is pulled low
R_OUT is enabled because R_EN has higher priority (Priority order: RGB).
Figure 16. Control Signals
Copyright © 2010–2013, Texas Instruments Incorporated
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