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AS3695A Datasheet(PDF) 5 Page - ams AG

Part # AS3695A
Description  16 channel white LED driver for LCD backlight
PDF  34 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3695A Datasheet(HTML) 5 Page - ams AG

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AS3695A
austriamicrosystems
www.austriamicrosystems.com
Rev 1.10 / 2010-12-8
4 - 33
3.2.3 Current outputs
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Vcurrx
Output voltage pins
CURRx
30
V
Icurrx
Output current
VDAC = 0.25V Vcurr = 0.6V
120
mA
Rcurrx
Input resistance in
CURRx
PWM = 0
PWM = 1
10
0.1
M
M
IResx
Input current pin RESx
URESx = 0.5V
URESx = 0.8V
10
100
uA
Iled_250
Trimmed
Current accuracy
Trimmed during production
ILED =100mA, Temp = 25°C,
DACref=800mV, VDAC = 250mV
(1)
(excluding error of external Rset)
-0.5
+0.5
%
Iled_all
FET
Current accuracy
External FET
Temp = 25°C, DACref=800mV,
VDAC = 200mV to 800mV
(2)
(excluding error of external Rset)
-1.4
+1.4
%
Ich_250
Channel to channel
Current accuracy
ILED =100mA, Temp = 25°C,
DACref=800mV, VDAC = 250mV
(1)
(excluding error of external Rset)
0.2
%
Iled_all
FET
Current accuracy
Tjunction = -20°C to +100°C,
DACref=800mV,
VDAC = 200mV to 800mV
(2)
(excluding error of external Rset)
-1.5
+1.5
%
Note:
(1) It is recommended to use DACref = 800mV in order to achieve specified accuracy
(2) It is not recommended to use DAC-voltages < 200mV in order to minimize influences from PCB-
layout and noise.
3.2.4 Feedback circuit, fault detectors
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
IFBmax
Feedback current
maximum
200
uA
RFBmin
Minim output resistance
VCURRx = 0.2V
200
500
IFB_g
FB transconductance
IFB_g = ∆IFB/ ∆VCURRx
-2
mA/V
VFB
Feedback voltage trip
point
Programmable,
Tolerance ±10%
0.6
0.8
1.0
VDAC
+0.35
V
Vshort
Short LED detection
voltage at Pin Dx
Programmable,
Tolerance ±1.2V
2
3
4
5
6
7
8
9
10
11
12
V
V
V
V
V
V
V
V
V
V
V



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