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ALED8102S Datasheet(PDF) 9 Page - STMicroelectronics

Part # ALED8102S
Description  Automotive 8-channel LED driver with direct switch control
PDF  19 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ALED8102S Datasheet(HTML) 9 Page - STMicroelectronics

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8
Driver headroom voltage
In order to correctly regulate the channel current, a minimum output voltage (VHEADROOM) across each current
generator must be guaranteed.
Figure below, 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]
ALED8102S
Driver headroom voltage
DS12430 - Rev 2
page 9/19



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