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PDF AS3693B1 Data sheet ( Hoja de datos )
| Número de pieza | AS3693B1 | |
| Descripción | 16 Channel high precision LED driver | |
| Fabricantes | austriamicrosystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS3693B1 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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AS3693B1
austriamicrosystems
Product Specification, Confidential
AS3693B1–16 Channel high precision LED driver for
LCD Backlight
1 General Description
The AS3693B1 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 MLF64, LQFP64
3 Applications
• LED backlighting for LCD – TV sets and
monitors
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Revision 1.26 / 2011-04-02
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1 page  
AS3693B1
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
AS3693B1)
-20
5.0
4.0
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
RcurrX Input resistance at pins CurrX
0.5
100
5.3 Electrical Characteristics
Typ Max Unit
Note
Not
Limited
V
Supply is not directly connected to
the AS3693B1 – 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
kΩ
Table 3 – Analog Electrical Characteristics
Symbol
Parameter
VCURR Voltage at CURR1 to CURR16
Min
Typ
Max Unit
50.0 V
Note
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Revision 1.26 / 2011-04-02
5 - 33
5 Page 
AS3693B1
7:2
000000
austriamicrosystems
www.austriamicrosystems.com
Revision 1.26 / 2011-04-02
11 - 33
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS3693B1.PDF ] | |
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