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DM632 Datasheet(PDF) 10 Page - Silicon Touch Technology Inc. |
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DM632 Datasheet(HTML) 10 Page - Silicon Touch Technology Inc. |
10 / 25 page 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.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. DM632 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 90mA by varying the resistor value. 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 80 90 M 50.86 48.60 48.39 47.66 46.97 46.13 44.74 43.94 43.20 42.24 O utput C urre nt a s a Func tiono R e xt va lue 0 10 20 30 40 50 60 70 80 90 100 01 234 5678 9 10 11 12 13 Re xt(KΩ) Output Current as a Function of Output Voltage 0 10 20 30 40 50 60 70 80 90 100 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 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. Iout (mA) ~ Vrext (V) Rrext (KΩ) × M |
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