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DM633 Fiches technique(PDF) 10 Page - Silicon Touch Technology Inc.

No de pièce DM633
Description  16-CHANNEL CONSTANT CURRENT LED DRIVER WITH PROGRAMMABLE PWM OUTPUTS
Download  26 Pages
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Fabricant  SITI [Silicon Touch Technology Inc.]
Site Internet  http://www.siti.com.tw
Logo SITI - Silicon Touch Technology Inc.

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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 12-bit PWM Constant Current LED Driver
Version : A.002
Page 9
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.
DM633
Constant-Current Output
Constant-current value (Iout
*1) of each output channel is set by an external resistor connected
between the REXT pin and GND. The current scale ranging can be adjusted from 5mA to 70mA by
varying the resistor value. User can input GBC value to increase Iout to 90mA.
The reference
voltage of REXT terminal (Vrext) is approximately 1.23V. The output current value is calculated by
the following equation:
Iout(mA)
5
10
20
30
40
50
60
70
M
41.13
39.35
36.78
35.09
33.75
32.53
31.35
30.09
Ou tput C urre nt a s a Functiono R e xt va lue
0
10
20
30
40
50
60
70
80
01
23
4
5
6
7
8
9
10
Re xt(KΩ)
Output Current as a Function of Output Voltage
0
10
20
30
40
50
60
70
80
0
0 .5
1
1 .5
2
2 .5
3
Vout (V)
In order to obtain a good performance of constant-current output, a suitable output voltage is
necessary. Users can get related information about the minimum output voltage above.
*1 Iout is typical current value setting under 100% PWM duty cycle and 75% Iout.
Iout*1 (mA) ~
V rext(V)
Rrext (KΩ)
× M


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