DD311 데이터 시트보기 (PDF) - Silicon Touch Technology Inc.

부품명

상세내역

제조사

DD311

HIGH CONSTANT CURRENT LED DRIVER

Silicon Touch Technology Inc. 

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

Power Dissipation

DD311

Notice that 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:

Tj(junction temperature)(max)(°C)– Ta(ambient temperature)(°C)

Pd(max)(Watt) =

Rth(junction-to-air thermal resistance)(°C/Watt)

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

below:

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

0

Tj(max)=125 °C

Rth=23.38 °C/Watt

20

40

60

80

100

120

140

Ambient Temperature Ta(°C)

Based on the Pd(max), the maximum allowable voltage of output terminal can be calculated as

follows:

Pd(max)(Watt)– VREXT(Volt) × IREF(A)

Vout(max)(Volt) =

Iout(A) × Dimming Duty

HIGH CONSTANT CURRENT LED DRIVER

Version:A.002

Page 11

Share Link: