DM164 SITI [Silicon Touch Technology Inc.], DM164 Datasheet - Page 27

• Manufacturer Part Number: DM164
• Description: 8x3-CHANNEL CONSTANT CURRENT LED DRIVER
• Manufacturer: SITI [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
determined by the following equation:
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
The power dissipation of a semiconductor chip is limited to its package and ambient
Pd(max)(Watt) =
Vout0 x Iout0 x Duty0 + . . . + Vout23 x Iout23 x Duty23 < Pd(max) – VDD x IDD
4.0
3.0
2.0
1.0
0.0
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
0
LQFP48
QFN48
20
Tj(junction temperature)(max)(
Ambient Temperature Ta (
40
Rth(junction-to-air thermal resistance)(
60
80
°
C)
–
Ta(ambient temperature)(
Version:A.002
o
Tj(max)=150
Rja(QFN48)=31.22
Rja(LQFP48)=57.86
100
C )
°
C/Watt)
120
o
C
o
C/W
o
C/W
140
°
C)
DM164
Page 26