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

9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C.

Tel：886-3-5645656

Fax：886-3-5645626

16-channel 16-bit PWM Constant Current LED Driver

Version : A.003

Page 19

未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任

Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.

DM634

Output to Output Delay

DM634 has build-in output to output delay with a special arrangement. This arrangement help

chip avoid noise cause by large current during channels switching. The arrangement details are

shown as following table.

Channel

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Delay units 0 4 1 5 2 6 3 7 3 7 2 4 1 5 0 4

Power Dissipation

The power dissipation of a semiconductor chip is limited to its package and ambient

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:

Pd(max)(Watt) =

The relationship between power dissipation and operating temperature can be referred to the

figure below:

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

0

2040

6080

100

120

140

160

Ambient Temperature Ta ( ℃ )

The power consumption of IC can be determined by the following equation and should be less

than the maximum allowable power dissipation:

Tj(max)=150

°C

°C/Watt

°C/Watt

°C/Watt

SSOP24

TSSOP24E

SOP24