SAMHOP Microelectronics Corp.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
Output Current - Duty (LED turn-on rate)
Output Current - REXT Resistor
Ta - P
D
R
EXT - IOUT
1.6
1.4
1.2
100
90
80
70
60
50
40
30
20
P/SP FREE
AIR
≒
Ω
×
I
OUT
{(1.23 / REXT ( )} 15.2
1
0.8
0.6
0.4
0.2
0
F/FN ON PCB
V
CE = 0.7V
DD = 5.0V
V
F/FN FREE AIR
10
0
200 300
500
1,000
2,000 3,000 5,000
-40 -20
0
80
20
40
60
Ω
Fig. 1
REXT ( )
Ambient Temerature Ta (oC)
Output Current - Output Voltage
IOUT-VOUT
0.1
0.09
0.08
0.07
Ω
Rext=240
0.06
0.05
0.04
IOUT
Ω
Rext=470
0.03
0.02
0.01
0
Ω
Rext=3900
0.5
1
1.5
2
2.5
3
0
VOUT
Page 10
V2.0 MAY,2003