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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6924D датащи(PDF) 15 Page - STMicroelectronics |
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L6924D датащи(HTML) 15 Page - STMicroelectronics |
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15 / 38 page  L6924D Operation description 15/38 The big difference is due to the fact that ICHG is higher than the current limit of the adapter. During the Fast-Charge Phase, the output voltage of the adapter drops and goes down to the battery voltage plus the voltage drop across the power MOSFET of the charger, as shown in the following equation: Where ∆V MOS is given by: Where, ILIM = current limit of the wall adapter, and RDS(on) = resistance of the power MOSFET. The difference between the set charge current and the adapter limit should be high enough to minimize the RDS(on) value (and the power dissipation). This makes the control loop completely unbalanced and the power element is fully turned on. Figure 8 shows the RDS(on) values for different output voltage and charging currents for an adapter current limit of 500mA. Figure 8. rDS(on) curves vs charging current and output voltage MOS BAT ADP IN V V V V ∆ + = = Eq. 7-2 I R V LIM ON DS MOS × = ∆ ) ( Eq. 7-3 |
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