DD311 データシートの表示（PDF） - Silicon Touch Technology Inc.

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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

Constant-Current Output

DD311

Constant-current value is set by the reference current input. The output current will be 100

times the input current value produced by an external resistor between the REXT pin and the bias

voltage*2 or, alternatively, force the low bias voltage to REXT pin. Varying the resistor or the bias

voltage value can adjust the current scale ranging up to 1A. Notice that the output current is a little

increasing or decreasing until the device temperature and ambient temperature are balance. The

output current value is calculated roughly by the following equation:

ILED (A) ～ 100 × ( Vbias－ VREXT ) / REXT (ohm) = 100 × IREF (A)

*2 The variation of bias voltage influences the output stability directly.

HIGH CONSTANT CURRENT LED DRIVER

Version:A.002

Page 6

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