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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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L6924U Fiches technique(PDF) 13 Page - STMicroelectronics |
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L6924U Fiches technique(HTML) 13 Page - STMicroelectronics |
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13 / 38 page  L6924U Operation description 13/38 Figure 6. Typical charge curves in linear mode The worst case in power dissipation occurs when the device starts the fast-charge phase. In fact, the battery voltage is at its minimum value. In this case, there is the maximum difference between the adapter voltage and battery voltage, and the charge current is at its maximum value. The power dissipated is given by the following formula: Equation 1 The higher the adapter voltage is, the higher the power dissipated is. The maximum power dissipated depends on the thermal impedance of the device mounted on board. End Charge Voltage-Regulation Phase Power dissipation Pre-Charge Phase Fast-Charge Phase I PRETH I CHG V OPRGTH Battery Voltage Charge Current Adapter Voltage V ADP V PRETH CHG BAT ADP DIS I V V P × − = ) ( |
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