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LED8102S bảng dữ liệu(PDF) 10 Page - STMicroelectronics

tên linh kiện LED8102S
Giải thích chi tiết về linh kiện  8-channel LED driver with direct switch control
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LED8102S bảng dữ liệu(HTML) 10 Page - STMicroelectronics

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8
LED current settings
The current drawn each OUTn channel is set by RSET resistor value according to the following formula:
IOUT=1.2/Rext*16
Driver headroom voltage
In order to correctly regulate the channel current, a minimum output voltage (VHEADROOM) across each current
generator must be guaranteed.
Figure 7, shows the minimum VHEADROOM slightly less than the target value (output MOS transistor in triode
region).
If the VHEADROOM is lower than the minimum recommended, the regulation of a current is lower than the expected
one. However an excess of VHEADROOM increases the power dissipation.
Figure 7. Minimum Vheadroom vs. IOUT (TJ = 25 °C)
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Vheadroom min. [mV]
LED8102S
LED current settings
DS12963 - Rev 3
page 10/20



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