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AP4460 Datasheet(PDF) 9 Page - Asahi Kasei Microsystems |
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AP4460 Datasheet(HTML) 9 Page - Asahi Kasei Microsystems |
9 / 18 page [AP4460] 014012310-E-01 2015/04 - 9 - F1, F2 and F3 switches compose the Power Path function. The F1 switch is placed between the PPIN pin and the VS1 pin, F2 switch is placed between the VS1 pin and the VS2 pin and F3 switch is placed between the VS1 pin and the VOUT pin. The F1 switch is synchronized with DC-DC convertor statement that is controlled by the VD condition. When the VD voltage reaches VVDTGT by DC-DC converter, the F1 switch becomes ON state and the VD charge is transferred to VS1 to charge the external capacitor until VD voltage becomes less than VVDTGT-VVDTGTHYS. In other situations, the F1 switch is in OFF state to prevent reverse current flowing from the VS1 pin to the VD pin. When the VS1 voltage reaches VVOUTEN, the F3 switch becomes ON state and the VOUT output is available for system loads. The F3 switch is turned OFF when the VS1 voltage becomes less than VVOUTDIS. When the VS1 voltage reaches VVS2CHG, the F2 switch changes to ON state and the VS1 charge is transferred to the capacitor connected to the VS2 pin until the VS1 voltage becomes VVS2HLD. When VS1 voltage drops less than VVS2DCH, the F2 switch also becomes ON state and the VS2 charge is transferred to the capacitor connected to the VS1 pin. If the VS1 voltage is below VVOUTDIS, the F2 switch is turned OFF. Unnecessary power dissipation of the external system can be reduced by setting VOUTDIS higher than the lowest operation voltage of the external system connected to the VOUT pin. When the VD voltage becomes less than VVPORL, the F2 and F3 switches become ON state. At this time, if the capacitor connected to the VS2 pin (CVS2) is charged enough, the power supply operation to the external system is continued. In case the VD voltage again reaches VVDTGT, the F2 and F3 switches remain in ON state if the VS1 voltage is over VVOUTDIS×1.03. If VS1 voltage is below VVOUTDIS, the F2 and F3 switches change to OFF state. Figure 4. State Transition of the Power Path Switches 10.2 Determine the control threshold of the DC-DC converter and power path Four resistors are needed to connect in series between the VREF pin and GND to determine the output target of the DC-DC convertor (VVDTGT), the output start voltage of the VOUT pin and charge/discharge threshold of the super capacitor. The voltages between each resistor should be input to the VDSET pin, the VSSET pin and the VLSET pin. The control threshold of the DC-DC convertor input voltage can be determined by connecting three resistors in series between the VREF pin and GND, and the voltages between each resistor should be input to the MPPH pin and the MPPL pin. The connection of resistors is shown in Figure 5. Figure 5. Resistor connection circuit |
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