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Analog Devices Semiconductor Electronic Components Datasheet

LT3967 Datasheet

1.3A Eight-Switch Matrix LED Dimmer

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FEATURES
n Eight Independent 15V/110mΩ NMOS Switches
n Controls LED Dimming of Strings Up to 54V
n I2C Serial Interface with Programmable Address
n I2C Packet Error Checking with CRC-8
n Programmable 256:1 (8-Bit) PWM Dimming
n 11-Bit Precision Exponential Fade with
Programmable Time
n Independent On/Off Control for Each Switch
n Programmable Shorted/Open LED Threshold with
Fault Reporting
n Internal PWM Signal Generator
n Programmable Watchdog Timer
n Accurate VIN Referred Enable Pin
n User Defined Power-Up/Reset State of Switches
n Thermally Enhanced TSSOP Package
APPLICATIONS
n Automotive LED Headlight Clusters
n Large LED Displays
n RGBW Color Mixing Lighting
LT3967
1.3A Eight-Switch Matrix
LED Dimmer with CRC-8
DESCRIPTION
The LT®3967 is an LED bypass switching device for dim-
ming individual LEDs in a string using a common current
source. It features eight individually controlled floating
source 15V/110mΩ NMOS switches. The eight switches
can be connected in parallel and/or in series to bypass
current around LEDs in a string. The LT3967 uses the I2C
serial interface to communicate with a microcontroller.
Each of the eight channels can be independently pro-
grammed to bypass the LED string in constant on or off,
or PWM dimming with or without fade transition. Using
the programmable fade option provides 11-bit resolution
exponential transition between PWM dimming states. The
LT3967 provides an internal clock generator and also sup-
ports an external clock source for PWM dimming. The
LT3967 reports fault conditions for each channel such as
open LED and shorted LED. The four address pins allow
16 LT3967 devices to share the I2C bus and define the
power-up state of the switches.
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
1A Matrix LED Dimmer Powered by a Buck LED Driver
VIN
32V TO 36V
10µF
50V
1µF ×2
50V
VIN
255k
EN/UVLO
10.2k
LT3932
D1
INTVCC
BST
22nF
SW
VOUT
267k
FB
10k
L1
33µH
D2
LED+
1A
100mΩ
22nF
50V
D1: NEXPERIA BAT46WJ
D2: NXP PMEG4010CEJ
L1: WURTH 74437349330
PWMTG, FAULT, AND
ISMON NOT USED
2.2µF
INTVCC
1M
2.2µF
VREF
GND
CTRL
ISP
PWM
ISN
INTVCC
SS
SYNC/SPRD
RT
RP VC
287k
350kHz
10nF
330pF
CLKIN
1A
UP TO 26V LED
1µF
50V
10k
DRN8 VIN
ENH
SRC8
DRN7
SRC7
VDD
DRN6
LT3967
SRC6
DRN5
ALERT
SRC5
DRN4
SRC4
DRN3
SCL
SDA
RTSYNC
SRC3
DRN2
WDI
SRC2
DRN1
ADDR1
ADDR2
ADDR3
SRC1 GND ADDR4
49.9k
LED+
VDD
2.2µF
10k
10k
10k
CLKIN
3.3V
0V
350kHz
10nF
3967 TA01
Document Feedback
For more information www.analog.com
Rev 0
1


Analog Devices Semiconductor Electronic Components Datasheet

LT3967 Datasheet

1.3A Eight-Switch Matrix LED Dimmer

No Preview Available !

LT3967
TABLE OF CONTENTS
Features............................................................................................................................. 1
Applications........................................................................................................................ 1
Typical Application................................................................................................................ 1
Description......................................................................................................................... 1
Absolute Maximum Ratings...................................................................................................... 3
Pin Configuration.................................................................................................................. 3
Order Information.................................................................................................................. 3
Electrical Characteristics......................................................................................................... 4
Typical Performance Characteristics........................................................................................... 7
Pin Functions....................................................................................................................... 9
Block Diagram.....................................................................................................................11
Applications Information........................................................................................................12
Overview................................................................................................................................................................ 12
Power-On Reset and Dimming Cycle Initialization................................................................................................. 12
Operation in Shutdown Condition.......................................................................................................................... 12
Dimming without Fade Transition vs Dimming with Fade Transition...................................................................... 13
LT3967 I2C Registers............................................................................................................................................ 14
LT3967 Command Registers and Channel Control................................................................................................ 14
I2C Serial Interface................................................................................................................................................. 14
The Start and Stop Conditions............................................................................................................................... 17
I2C Serial Port Data Transfer.................................................................................................................................. 17
LT3967 I2C Commands and Write/Read Protocols................................................................................................ 19
LT3967 Alert Response Protocol Using Alert Response Address (ARA)................................................................ 23
Watchdog Timeout Reset....................................................................................................................................... 24
RTSYNC Input Clock Fault Detection and Alert Assertion....................................................................................... 24
LED/Overheat Fault Detection And Reporting......................................................................................................... 24
Open LED Fault Detection and Alert Assertion....................................................................................................... 25
Shorted LED Fault Detection and Alert Assertion................................................................................................... 25
LED Fault Status Bit Clearance............................................................................................................................... 25
Overheat Fault Detection and Alert Assertion......................................................................................................... 25
Overheat Status Bits Clearance.............................................................................................................................. 25
Alert Deassertion................................................................................................................................................... 25
Printed Circuit Board Layout.................................................................................................................................. 25
Typical Applications..............................................................................................................27
Package Description.............................................................................................................28
Typical Application...............................................................................................................30
Related Parts......................................................................................................................30
Rev 0
2
For more information www.analog.com


Part Number LT3967
Description 1.3A Eight-Switch Matrix LED Dimmer
Maker Analog Devices
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LT3967 Datasheet PDF






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