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TPS65070-Q1 Datasheet(PDF) 26 Page - Texas Instruments |
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TPS65070-Q1 Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 91 page  VBAT(REG) IO(CHG) VLOWV I(TERM) PRECHARGE CCFASTCHARGE CVTAPER DONE Battery Voltage BatteryCurrent TERMCURRENT=1 I(PRECHG) TPS65070-Q1, TPS65072-Q1, TPS65073-Q1, TPS650732-Q1 SLVSAP7 – JANUARY 2011 www.ti.com Figure 27. Battery Charge In the pre-charge phase, the battery is charged at a current of IPRECHG. The battery voltage starts rising. Once the battery voltage crosses the VLOWV threshold, the battery is charged at a current of ICHG. The battery voltage continues to rise. When the battery voltage reaches VBAT(REG), the battery is held at a constant value of VBAT(REG). The battery current now decreases as the battery approaches full charge. When the battery current reaches ITERM, the TERM CURRENT flag in register CHGCONFIG0 indicates charging done by going high. Note that termination detection is disabled whenever the charge rate is reduced from the set point because of the actions of the thermal loop, the DPM loop or the VIN-LOW loop. The value of the fast-charge current is set by the resistor connected from the ISET pin to GND, and is given by the equation ICHG = KISET / RISET (1) (1) RISET = KISET / ICHG (2) (2) Note that if ICHG is programmed as greater than the input current limit, the battery will not charge at the rate of ICHG, but at the slower rate of IIN-MAX (minus the load current on the OUT pin, if any). In this case, the charger timers will be slowed down by 2x whenever the thermal loop or DPPM is active. I-PRECHARGE: The value for the pre-charge current is fixed to a factor of 0.1 of the fast charge current (full scale current) programmed by the external resistor Rset ITERM: The value for the termination current threshold can be set in register CHGCONFIG3 using Bits TERMINATION CURRENT FACTOR 0 and TERMINATION CURRENT FACTOR 1. The termination current is pre-set to a factor of 0.1 of the fast charge current programmed by the external resistor Rset. Battery Detection and Recharge: Whenever the battery voltage falls below VRCH (Vset-100mV), a check is performed to see whether the battery has been removed: current IBAT(DET) is pulled from the battery for a duration tDET. If the voltage on the BAT pin remains above VLOWV, it indicates that the battery is still connected. If the charger is enabled by Bit CHARGER ENABLE in register CHGCONFIG1 set to 1, the charger is turned on again to top up the battery. 26 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated Product Folder Link(s) :TPS65070-Q1 TPS65072-Q1 TPS65073-Q1 TPS650732-Q1 |
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