SM16705 Datasheet, PDF (11/15 Pages) SamHop Microelectronics Corp. – 8-BIT CONSTANT CURRENT LED DRIVER

SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
Output Current - Duty (LED turn-on rate)
Ta - PD
1.6
1.4
P FREE AIR
1.2
1
F/FN ON PCB
0.8
0.6
F/FN FREE AIR
0.4
0.2
0
-40 -20 0
20 40 60 80
Ambient Temerature Ta (^oC)
Output Current - REXT Resistor
REXT - IOUT
100
90
80
70
IOUT ≒ {(1.25 / REXT (Ω)} ×14.7
60
VOUT = 0.7V
50
VDD = 5.0V
40
30
20
10
0
200 300 500
1,000 2,000 3,000 5,000
R_EXT (Ω) Fig. 1
Output Current - Output Voltage
0.09
0.08
0.07
0.06
0.05
Ice ^0.04
0.03
0.02
0.01
0
-0.01
0
0.5
1
Vce-Ice
1.5
2
Vce
R=240Ω
R=470Ω
R=3900Ω
2.5
3
3.5
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V.2.10