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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) 14 Page - STMicroelectronics |
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L6924D датащи(HTML) 14 Page - STMicroelectronics |
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14 / 38 page  Operation description L6924D 14/38 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, this 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: The higher the adapter voltage is, the higher the power dissipated. The maximum power dissipated depends on the thermal impedance of the device mounted on board. 6.2 Quasi-pulse mode The Quasi-Pulse Mode can be used when the system can rely on the current limit of the upstream adapter to charge the battery. In this case, ICHG must be set higher than the current limit of the adapter. In this mode, the L6924D charges the battery with the same three phases as in Linear Mode, but the power dissipation is greatly reduced as shown in Figure 7. Figure 7. Typical charge curves in quasi pulse mode CHG BAT ADP DIS I V V P × − = ) ( Eq. 7-1 Adapter Voltage Charge Current Power dissipation Battery Voltage End Charge Voltage Regulation Phase Pre-Charge Phase Fast-Charge Phase I LIM Ilim x Rdson I PRETH I CHG V PRETH V OPRGTH V ADP |
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