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PDF AS3693B Data sheet ( Hoja de datos )
| Número de pieza | AS3693B | |
| Descripción | 16 Channel high precision LED driver | |
| Fabricantes | austriamicrosystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS3693B (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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AS3693B
austriamicrosystems
Product Specification, Confidential
AS3693B–16 Channel high precision LED driver for
LCD Backlight
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
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
3 Applications
• LED backlighting for LCD – TV sets and
monitors
www.austriamicrosystems.com
Revision 1.21 / 2011-09-30
1 - 32
1 page  
AS3693B
5.2 Operating Conditions
Test circuit
austriamicrosystems
Vcurr
Vreg
V2_5
Vreg
SDI
SCLK
xCS
Vsync
Hsync
Curr1
Rfb1 Curr2
Rfb2
Gate1
Gate2
AS3693B
SDO
Fault
Ref(EXT) V2_5 AGND
2.2uF
2.2uF
GND
( Exposed Pad )
Curr15 Rfb15 Curr16 Rfb16
Gate15
Gate16
ADDR2 ADDR1
FBR
FBG
FBB
Table 2 – Operating Conditions
Symbol
Parameter
VDD
Main Supply
Min
VDDTOL Main Supply Voltage Tolerance
VREGINT
VREGEXT
Supply (shunt regulated by
AS3693B)
-20
5.0
3
VUVL Untervoltage lockout voltage 2.4
IVREG
Supply Current (Chip current
consumption)
IVREG_M
AX
Maximum Supply current
IVREG
EXT_OFF
Igate
Gate driving capability
0.5
Typ Max Unit
Note
Not
Limited
V
Supply is not directly connected to
the AS3693B – see section ‘Shunt
Regulator’
+20
%
Applies only for supply VREG is
connected via Rvdd
5.2
5.4
V
If internally (shunt-)regulated by
ZD1
4.5 4.9 V If externally supplied
If Vreg < UVUL current sources
2.7 3 V are turned off
( Addr 0x01,Addr 0x02 = 0x00 )
Excluding current through shunt
regulator (ZD1) – see section
20 mA ‘Shunt Regulator’. Note: Take care
of the Power dissipation of the
external Resistor.
Maximum Current Into VREG –
30 mA PIN (Supply current + shunt
regulator current).
Condition: externally supplied
350 uA Curr_reg1-16 off (register 01h =
00h, register 02h = 00h)
1 2 mA Gate1 – Gate16 output current
www.austriamicrosystems.com
Revision 1.21 / 2011-09-30
5 - 32
5 Page 
AS3693B
austriamicrosystems
7.1.1 Feedback Selection
In the AS3693B, each led – string feedback can be assigned to the specific led-supply, to minimize the power
consumption in the system. It can be chosen in between FBR, FBG and FBB.
From main
supply
DCDC Converter
for VDD
(Internal or externa)l
Voltage Feedback Vfb
input for DCDC
R1
R3
R2
C1
AS3693B
ANALOG REGULATION
CIRCUIT
16 REGULATORS
3...16
2
1
FB R
FB G
FB B
N OFB
VC
SHORTLED
VSL
OPENLED
VOL
REF
Feedback resistor divider
(part of DCDC converter circuit)
R5
Table 7 – Feedback Selection
Addr: 05h,06h,07h,08h
Bit Bit Name
FB1_Select
1:0
FB5_Select
FB9_Select
FB13_Select
FB2_Select
3:2
FB6_Select
FB10_Select
FB14_Select
FB3_Select
5:4
FB7_Select
FB11_Select
FB15_Select
FB4_Select
7:6
FB8_Select
FB12_Select
FB16_Select
Feedback Select 1-4
This register controls the Feedback of the Automatic feedback loop
Default
00
01
01
10
Access
Description
Selects the feedback of the voltage regulators
00= regulator on FBR
R/W 01= regulator on FBG
10= regulator on FBB
11= regulator not connected to FB
Selects the feedback of the voltage regulators
00= regulator on FBR
R/W 01= regulator on FBG
10= regulator on FBB
11= regulator not connected to FB
Selects the feedback of the voltage regulators
00= regulator on FBR
R/W 01= regulator on FBG
10= regulator on FBB
11= regulator not connected to FB
Selects the feedback of the voltage regulators
00= regulator on FBR
R/W 01= regulator on FBG
10= regulator on FBB
11= regulator not connected to FB
www.austriamicrosystems.com
Revision 1.21 / 2011-09-30
11 - 32
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS3693B.PDF ] | |
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