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AS3693A QFN48
austriamicrosystems
Product Specification, Confidential
1 General Description
The AS3693A is a 16 channels high precision LED
driver with build in PWM generators for building
backlight panels in LCD-TV-sets.
External clock and synchronizing inputs allow the
synchronization of the LCD backlight with the TV
picture. Local dimming and scan dimming is
supported by 16 independent PWM generators with
programmable delay, period and duty cycle. Three
free configurable dynamic power feedback circuits
make the device usable for white LED as well as
RGB backlights. Build in safety features include
thermal shutdown as well as open and short LED
detection. All circuit parameters are programmable
via I2C or SPI interface.
2 Key Features
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16 Channel LED driver
Output current 70mA (150mA) per channel
Output voltage 0.4V to 50V
Absolute current accuracy +/- 0.5%
Output slew rate programmable
Current programmable with external resistor
Linear current control with 8 - bit DAC
Linear current control with external analog
voltage
Digital current control with 16 independent
PWM generators
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Free programmable 12 bit resolution ( period,
high time and delay )
Overvoltage detection ( short LED )
Undervoltage detection ( open LED )
Temperature shutdown
Fault interrupt output
H-Sync, V-Sync inputs to synchronize with TV-
set
Internal or external PWM – clock
I2C interface
SPI interface
5 bit device - address (sets device address
and interface mode)
Automatic supply regulation feedback
Each output can be assigned to red, green or
blue feedback.
Package QFN48 6x6mm, 0.4mm pitch,
QFN48 7x7mm, 0.5mm pitch
3 Applications
•
LED backlighting for LCD – TV sets and
monitors
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AS3693A –16 Channel high precision LED driver for
LCD Backlight
AS3693A QFN48
austriamicrosystems
4 Block Diagram
Vsupply
V2_5
Vreg
FBB
FBG
FBR
PWM
PWM
PWM
Fault detectors
PWM
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Vsync
Hsync
Addr2
Addr1
SDA
SCL
CS
SDO
Fault
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PWM
SMPS
feedback
PWM
PWM
PWM
AS3693A
PWM
PWM
PWM
PWM
PWM
86 byte
registers
PWM
PWM
SPI / I2C
Interface
PWM
V2_5
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Reference,
DAC
REF
AS3693A QFN48
austriamicrosystems
Table of Contents
General Description ....................................................................................................................................... 1
Digital interface ..................................................................................................................................... 19
10 Ordering Information .................................................................................................................................... 38
Contact Information ............................................................................................................................................. 39
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3
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5
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AS3693A QFN48
austriamicrosystems
5 Characteristics
5.1 Absolute Maximum Ratings
Stresses beyond those listed in Table 1 may cause permanent damage to the device. These are stress ratings
only and functional operation of the device at these or any other conditions beyond those indicated in Section 5
Electrical Characteristics is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Table
1 – Absolute Maximum Ratings
Symbol
V
DDMAX
V
INVREG
I
INVREG
V
IN2.5V
V
IN5V
V
IN50V
I
IN
T
STRG
Parameter
Supply for LED’s
VREG supply voltage
Maximum Vreg current
2.5 V Pins
5V Pins
Min
-0.3
-0.3
Max
>50
7.0
100
Unit
V
V
mA
V
See notes
1
Note
Applicable for pin VREG
Input Pin Current
Storage Temperature Range
Humidity
V
ESD
V
ESD
PT
P
DERATE
T
BODY
Notes:
Electrostatic Discharge on Pins
Curr1 – Curr16
Electrostatic Discharge on all Pins
Total Power Dissipation
PT Derating Factor
Body Temperature during
Soldering
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1, As the AS3693A is not directly connected to this supply. Only the parameters V
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