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LED2472GQTR bảng dữ liệu(PDF) 31 Page - STMicroelectronics

tên linh kiện LED2472GQTR
Giải thích chi tiết về linh kiện  24-channels LED driver with error detection and gain control
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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LED2472GQTR bảng dữ liệu(HTML) 31 Page - STMicroelectronics

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LED2472G
Dropout voltage
12
Dropout voltage
In order to correctly regulate the channel current, a minimum voltage (VDROP) across each
current generator must be guaranteed. Figure 18 and Table 14 show the minimum VDROP
related to the current to regulate. A VDROP lower than the minimum recommended implies
the regulation of a current lower than that expected. However, an excess of VDROP
increases the power dissipation. When all outputs are loaded simultaneously, the minimum
working drop rises. In full load condition at 61 mA per channel the minimum voltage to apply
on each channel must be increased by about 400 mV (550 mV at 72 mA).
Figure 18. Typical dropout voltage vs. output current (only one channel ON)
Table 14. Minimum dropout voltage for some current values (only one channel ON)
Output nominal current [mA]
Minimum VDROP [mV]
VDD = 3.3 V
5120
15
280
21
320
61
800
75
1050



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