LED2472G datasheet(31/39 Pages) STMICROELECTRONICS

部件名	LED2472G

功能描述	24-channels LED driver with error detection and gain control

PDF	39 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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31 / 39 page

DocID024620 Rev 3

31/39

LED2472G

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

280

320

800

1050

LED2472G 数据表(PDF) 31 Page - STMicroelectronics