DD3111 Silicon Touch Technology Inc., DD3111 Datasheet - Page 12

• Manufacturer Part Number: DD3111
• Description: High Constant Current Driver
• Manufacturer: Silicon Touch Technology Inc.

Power Dissipation
temperature, in which the device requires the maximum output current calculated for given
operating conditions. The maximum allowable power consumption can be calculated by the
following equation:
The relationship between power dissipation and operating temperature can be refer to the figure
below:
Based on the Pd(max), the maximum allowable voltage of output terminal can be calculated as
follows:
HIGH CONSTANT CURRENT LED DRIVER
Notice that the power dissipation of a semiconductor chip is limited to its package and ambient
Pd(max)(Watt) =
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC
新竹市科學園區展業一路 9 號 7 樓之 1
Tel：[phone]
9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C.
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
Vout(max)(Volt) =
0
Fax：[phone]
Tj(junction temperature)(max)(
20
Rth(junction-to-air thermal resistance)(
Ambient Temperature Ta(°C)
40
.
Pd(max)(Watt)
60
Iout(A)
×
–
80
°
C)
Dimming Duty
V
–
REXT
Version:A.002
Ta(ambient temperature)(
Tj(max)=125 °C
Rth=23.38 °C/Watt
(Volt)
100
×
I
REF
°
120
C/Watt)
(A)
140
°
Page 11
C)
DD311