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LDS8161/41
RECOMMENDED OPERATING CONDITIONS
Parameter
V IN
I LED per LED pin
Total Output Current I LOAD
Junction Temperature Range
Rating
2.5 to 5.5
0 – 31.875
191.25
-40 to +125
Unit
V
mA
mA
°C
Typical application circuit with external components is shown on page 1.
ELECTRICAL OPERATING CHARACTERISTICS
(Over recommended operating conditions unless specified otherwise) V IN = 3.6V, C IN = 1 μF, EN = High, T AMB = 25°C
Name
LEDx Channel Current DAC Range
Conditions
Min
0
Typ
Max
31.875
Units
mA
# of LEDx Current steps (linear steps)
LEDx Current DAC Resolution/step
256
0.125
steps
mA
Standby (no I C clock)
EN = V IN
2
125
μA
Quiescent Current
6/4 Channels at 100%
DC PWMs and Temp
De-Rating Active
I LOAD = 120 mA/ 80 mA
I LOAD = 60 mA / 40 mA
0.6/0.45
0.45/0.35 0.35
mA
mA
Load Regulation
Dropout Voltage
Shutdown Current
LED Current Accuracy
LED Channel Matching
Line Regulation
1
2
PWM Frequency
# of PWM duty cycle steps
Minimum PWM On Time
PWM resolution
PWM Step Size
V EN = 0V
5 mA ≤ I LED ≤ 30 mA
(I LED - I LEDAVG ) / I LEDAVG
2.7 V ≤ V IN ≤ 4.2 V
0.2 V < Vdx < 1.2 V
1 mA ≤ I LED ≤ 30 mA
Log Mode steps
Log Mode
Log Mode
0.5
±1.5
±1.5
2
1
50
285
256
13.7
12
0.17
1
75
μA
%
%
%/V
%/V
mV
Hz
μs
bits
dB
Steps/5 C
C
C
C
of ?
?? ? PWM Steps for current de-rating
De-rating Temperature Adjust Steps
Programmable De-rating Start
Temperature (Tj) Range (typical)
Programmable LED Shutdown
Temperature(Tj) Range (typical)
1-x Scale Mode
2-x Scale Mode
-7
-14
30
80
5
55
105
0
0
80
120
PWM
0
0
0
0
EN Pin
Input current
Logic Level
High
Low
Active mode, EN = V IN
Normal Standby
Active Mode or Normal
Standby Mode
-1
1.2
5
1
0.4
μA
V
Input Current Limit
Thermal Shutdown
Thermal Hysteresis
450
150
20
mA
°C
Output short circuit Threshold
Wake-up/Shutdown Delay Time from EN
Raising/Falling Edge
3
Note:
1. Vdx = Vin – V F ,
Soft ramp disabled
Soft ramp enabled
I LED = 20 mA
10
250
0.14
ms
ms
V
2. Vdx = Vin – V F , at which I ILED decreases by 10% from set value
3. Minimum LED forward voltage, which will be interpreted as “LED SHORT” condition
? 2009 IXYS Corp.
Characteristics subject to change without notice
3
Doc. No. 8141/61_DS, Rev. N1.0
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