tb62719af TOSHIBA Semiconductor CORPORATION, tb62719af Datasheet - Page 5

• Manufacturer Part Number: tb62719af
• Description: 16ch Constant Current Drivers And Controller For Full-color Led Modules And Panels
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Constant Current Adjustment Range
This Graph Shows How Current May Be Adjusted to a Fraction of Its Full-Scale Value.
Note: In each case, the value input to each DAC is the value output from the previous DAC.
Reference: Current adjustment functions
Note: Assuming precise linear correlation between output current and LED brightness
DAC1 to DAC3 are the current adjustment functions for all outputs.
Therefore,
It is recommended that DAC1 and DAC2 be used for adjusting the REXT resistance.
It is recommended that DAC3 be used for adjusting brightness between module.
(after it was set and it had DAC4 adjusted to the dot.)
The beginning is set in about 75% of the middle value, after that it is effective to use ±25% of set width.
DAC4 is the current adjustment function for each outputs.
And also, DAC4 has a very wide setting range.
Therefore, DAC4 can be used to adjust the brightness of LEDs without a rank classification.
This method allows brightness to be adjusted with a degree of accuracy of 1.27% of full scale.
The adjustment width of DAC1 is large and approximate (1LSB ∼ − 25%).
The adjustment width of DAC2 is the smallest and has a large error (1LSB ∼ − 0.95%).
The adjustment width of DAC3 is small. DAC3 is a high-performance DAC with a small error
(1LSB ∼ − 1.61%).
The adjustment width of DAC4 is small. But it is a high-performance DAC with a small error
(1LSB ∼ − 1.27%).
(graph)
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TB62719AF
2004-05-12