點晶科技股�½有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
Pd - Ta
1.80
1.60
1.40
1.20
Pd (W)
1.00
0.80
0.60
0.40
0.20
0.00
0
20
40
60 Ta 80
100
120
140
160
SSOP
SOP
DIP
Imax - Ta ( DM115 )
70
60
SOP
DIP
50
SSOP
Im a x (m A)
40
30
20
10
0
0
20
40
60
80
Ta
100
120
140
160
Note
As the power dissipation of a semiconductor chip is limited its package and ambient temperature,
this device requires a maximum output current be calculated for a given operating condition. The
maximum allowable power consumption (Pd (max)) of this device is calculated as follows:
(Tj (junction temperature) (max) - Ta (ambient temperature) )(
°
C
)
Pd
(max)(
Watt
)
=
Rth (
°
C
/
Watt
)
Based on the Pd (max), the maximum allowable current can be calculated as follows:
Iout = ( Pd – V
DD
‧I
DD
) / ( # outputs‧Vo‧Duty )
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
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