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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LED2472GQTR датащи(PDF) 31 Page - STMicroelectronics |
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LED2472GQTR датащи(HTML) 31 Page - STMicroelectronics |
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31 / 39 page  DocID024620 Rev 3 31/39 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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