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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM6681ATR датащи(PDF) 27 Page - STMicroelectronics |
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PM6681ATR датащи(HTML) 27 Page - STMicroelectronics |
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27 / 47 page  PM6681A Device description 27/47 The adjustable linear regulator is supplied by LDO5 output. It turns on after LDO5 power up sequence. It can provide up to 100 mA peak current. Set up the feedback resistor divider according to the following formula, to regulate a voltage from 0.9 V to 3.3 V. Equation 12 where LDO is the desired output voltage, Vr = 0.9 V is the internal reference voltage and Rup and Rdown are the resistors of the feedback divider, as shown in Figure 38: Figure 38. LDO linear regulator Bypass LDO5 and LDO output with 1-10 µF ceramic capacitor and a 4,7 µF tantalum capacitor (ESR ≥ 2 Ω). Table 8. V5SW multifunction pin V5SW Description GND The 5 V linear regulator is always turned on and supplies LDO5 output. Switching 5 V output The 5 V linear regulator is turned off when the voltage on V5SW is above 4.8 V and LDO5 output is supplied by the switching 5 V output. External 5 V supply The 5 V linear regulator is turned off when the voltage on V5SW is above 4.8 V and LDO5 output is supplied by the external 5 V. ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + × = down up r R R 1 V LDO |
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