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AS3693B
austriamicrosystems
Product Specification, Confidential
1 General Description
The AS3693B is a 16 channels high precision LED
controller with build in PWM generators for driving
external FETs in LCD-backlight panels.
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
16 Channel LED driver
Output current only limited by external
transistor
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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3 Applications
•
LED backlighting for LCD – TV sets and
monitors
Revision 1.21 / 2011-09-30
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 epTQFP64 and QFN64
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AS3693B–16 Channel high precision LED driver for
LCD Backlight
AS3693B
austriamicrosystems
4 Block Diagram
Vsupply
V2_5
Vreg
PWM
FBB
FBG
FBR
Reference,
DAC
REF
PWM
PWM
Fault detectors
PWM
PWM
PWM
PWM
PWM
AS3693B
PWM
PWM
Typical application
10k
10k
10k
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Vsync
Hsync
100k
10k
V2_5
10k
100k
AS3693B
Ref(EXT)
V2_5
AGND
GND
( Exposed Pad )
2.2uF
2.2uF
ADDR2
ADDR1
FBR
FBG
FBB
SDO
Fault
Cfb
10uF
Cfb
10uF
Cfb
10uF
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Revision 1.21 / 2011-09-30
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PWM
PWM
PWM
86 byte
registers
PWM
PWM
SPI / I2C
Interface
PWM
Vsync
Hsync
Addr2
Addr1
SDA
SCL
CS
SDO
Fault
V2_5
Vdcdc
16 output
channels
Rvreg
2.2uF
Vreg
Curr1
Rfb1
Curr2
Rfb2
Curr15
Rfb15 Curr16
Rfb16
Gate1
Gate2
Gate15
Gate16
SDI
SCLK
xCS
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AS3693B
austriamicrosystems
Table of Contents
1
2
3
4
5
General Description ....................................................................................................................................... 1
Digital interface ..................................................................................................................................... 20
10 Ordering Information .................................................................................................................................... 31
Contact Information ............................................................................................................................................. 32
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AS3693B
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.
Symbol
V
DDMAX
V
INVREG
I
INVREG
V
IN2.5V
V
IN5V
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
V
See notes
1
Note
Applicable for pin VREG
-0.3
-0.3
V2_5+0.3V
VREG+
0.3V
55
Applicable for 2.5V pins
Applicable for 5V pins
2
V
IN50V
I
IN
T
STRG
V
ESD
V
ESD
PT
P
DERATE
T
BODY
Notes:
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50V Pins
-0.3
-25
V
Input Pin Current
+25
150
85
mA At 25ºC, Norm: Jedec 17
°C
%
V
Storage Temperature Range
Humidity
-55
5
Non condensing
Electrostatic Discharge on Pins
Curr1 – Curr16
-4000
4000
Electrostatic Discharge on all Pins
Total Power Dissipation
PT Derating Factor
-2000
2000
V
3.8W
40
W
mW/
3
See notes
°C
°C
Body Temperature during
Soldering
260
Revision 1.21 / 2011-09-30
Applicable for CURR1, CURR2,
CURR3 up to CURR16
Norm: MIL 883 E Method 3015
Norm: MIL 883 E Method 3015
At Ta = 25ºC, no airflow for
ePTQFP64 on two layer FR4-Cu
3
PCB
according to IPC/JEDEC J-STD-
020C
1, As the AS3693B is not directly connected to this supply. Only the parameters V
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