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PDF AS3695C Data sheet ( Hoja de datos )
| Número de pieza | AS3695C | |
| Descripción | 16 channel white LED controller | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS3695C (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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AS3695C
16 channel white LED controller for LCD backlight
Product Specification, Confidential
General Description
The AS3695C is a 16 channels precision LED controller
for driving external FET/BJT in LCD-backlight panels.
Dynamic power feedback controls the external power
supply to guarantee best efficiency. Build in safety
features include thermal shutdown as well as open and
short LED detection. The device is programmable via
serial interface.
16 Channel LED driver
Output voltage max. 30V
Output current only limited by external transistor
Linear current setting using 10-bit DAC
Current accuracy ±0.5% @ VDAC=250mV
Channel to Channel current accuracy ±0.2%
BJT base current compensation
Output slew rate programmable
Current programmable with external resistor
Digital current control with 16 independent PWM
generators
Free programmable 12 bit resolution
( period, high time and delay )
PWM-generator clock
Internal RC-oscillator
External Clock
PLL-synthesized clock from external signal
H-Sync, V-Sync inputs to synchronize with TV-set
Direct PWM mode
Undervoltage detection ( open LED )
Undervoltage auto-turnoff
Overvoltage detection ( short LED )
Overvoltage auto-turnoff
Temperature shutdown
Register lock/unlock function
Fault interrupt output
2 configurable supply regulation feedback outputs
SPI interface
4kV ESD at voltage sense inputs
2kV ESD an all other pins
Package QFN64 9x9mm, 0.5mm pitch
LQFP64 14x14mm, 0.8mm pitch
Applications
LED backlighting for LCD – TV sets and
monitors
1 Block diagram
VDD
VDD
FB1 FB2 V2_5
Filt1 Filt2 VSSA VSS_SENSE
D1 D16
G1
PWM
Reference
PWM
G16
S1
DAC
S16
D2 D15
G2
PWM
Fault detectors
PWM
G15
S2 S15
D3 SMPS D14
G3
PWM
feedback
PWM
G14
S3 S14
D4
PLL
D13
G4 PWM
S4
PWM
G13
S13
D5 AS3695C
D12
G5 PWM
PWM
G12
S5 S12
D6
G6 PWM
S6
PWM
D11
G11
S11
D7 D10
G7
PWM
Registers
PWM
G10
S7 S10
D8 D9
G8 PWM SPI PWM G9
S8 Interface S9
xRES xCS SDI SCL SDO
HSYNC VSYNC
EPAD
xFAULT
VDD
www.austriamicrosystems.com
Rev 1.11 / 2010-12-08
1 - 39
1 page  
AS3695C
austriamicrosystems
3.2.4 Feedback circuit, fault detectors
Symbol
Parameter
IFBmax
Feedback current
maximum
RFBmin Minim output resistance
IFB_g FB transconductance
Conditions
VDx = 0.2V
IFB_g = ∆IFB/ ∆VDx
VFB
Feedback voltage trip
point
Programmable
Tolerance ±10%
Vshort
Short LED detection
voltage at Pin Dx
Programmable
Tolerance ±1.2V
Vopen
Open LED detection
Voltage at Pin Sx
Tovtemp
Thyst
Over temperature limit
Over termperature
hysteresis
Programmable
Tolerance ±10%
Min Typ Max Unit
200 uA
200 800 Ω
-2 mA/V
0.6
0.8
1.0
VDAC
+0.35
V
2V
3V
4V
5V
6V
7V
8V
9V
10 V
11 V
12 V
50
100
200
VDAC
/2
mV
mV
mV
V
130 140 150 °C
10 °C
3.2.5 PWM-generators
Symbol
fOSC
fHSYNC
fVSYNC
fPLL
Parameter
Internal Clock for PWM
HSYNC frequency
VSYNC frequency
PLL frequency
Conditions
Min Typ Max Unit
400 500 600 kHz
100 2000 kHz
60 480 Hz
125 2000 kHz
3.2.6 Digital pins
Symbol
Parameter
Min Typ Max Unit
VIH
High Level Input voltage
1.3
VDD V
VIL
Low Level Input voltage
-0.3
0.8 V
VoH
High Level output voltage
VDD-
0.3
V I=mA
VoL Low Level output voltage
VDD-
0.3
V I=mA
VoL_PD
Low level output voltage open
drain outputs
VDD-
0.3
V I=mA
R_pu Input resistance PullUp inputs 300 kΩ
Note
www.austriamicrosystems.com
Rev 1.11 / 2010-12-08
5 - 39
5 Page 
AS3695C
austriamicrosystems
10...3us
11...1us
RegAddr: 0x09
SHORTLED1
Bit Name
7:0
SHORTLED
1-8
Description
Indicates short LED condition on outputs 1 to 8
0...no short LED detected
1... short LED detected
RegAddr: 0x0A
SHORTLED2
Bit Name
7:0
SHORTLED
9 - 16
Description
Indicates short LED condition on outputs 9 to 16
0...no short LED detected
1... short LED detected
RegAddr: 0x0B
OPENLED1
Bit Name
7:0
OPENLED
1-8
Description
Indicates open LED condition on outputs 1 to 8
0...no open LED detected
1... open LED detected
RegAddr: 0x0C
OPENLED2
Bit Name
7:0
OPENLED
9 - 16
Description
Indicates open LED condition on outputs 9 to 16
0...no open LED detected
1... open LED detected
RegAddr:
0x0E 0x0D
Bit Bit
1:0 7:0
DAC
Description
DAC[9:0] defines DADC output voltage
DACvoltage = DAC[9:0]* DACref/1024
Default
00000000
Acc
ess
r/w
Default
00000000
Acc
ess
r/w
Default
00000000
Acc
ess
r/w
Default
00000000
Acc
ess
r/w
Default
1000000000
Access
r/w
4.2
PWM-generators
Filt1
Filt2
R1
C0
C1
60 - 480Hz
Hsync
Vsync
NCdiv
ACdiv
ODdiv
PLL
125kHz - 2MHz
RefClk
RC-Oscillator
500kHz ±20%
ClockSrc0
ClockSrc1
VSYNCedge
clk
res
Periode
PW Mper
High Time
PW M16HT
PW M15HT
:
:
PW M2HT
PW M1HT
Delay
PW M16del
PW M15del
:
:
PWM2del
PWM1del
Reverse
PW Mrev
16 x PWM - generator
UpdateMode
SDI
SDO
SCLK
xCS
SPI
interface
Vsync
detect
VSYNCdet
4.2.1 Clock and reset
The clock for the build in PWM-generators can be one of three different sources.
1. Internal RC oscillator with 500KHz +-20%
PW Mext
PW Mx
www.austriamicrosystems.com
Rev 1.11 / 2010-12-08
11 - 39
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS3695C.PDF ] | |
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