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參數資料
| 型號： | TPS65810RTQT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 9-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC56 |
| 封裝： | 8 X 8 MM, GREEN, PLASTIC, QFN-56 |
| 文件頁數： | 47/99頁 |
| 文件大小： | 2128K |
| 代理商： | TPS65810RTQT |
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CHARGE SAFETY TIMER
TIMER FAULT RECOVERY
DYNAMIC TIMER FUNCTION
SLVS658B – MARCH 2006 – REVISED FEBRUARY 2007
The KPRE constant typical value is 0.1, setting the pre-charge timer value to 10% of the charge safety timer value.
When the charger is in suspend mode, set via I2C register CHG_CONFIG bit CHGON or set by a pack
temperature fault, the pre-charge safety timer is put on hold (i.e., charge safety timer is not reset). Normal
operation resumes when the charger exits the suspend mode. If V(BAT) does not reach the internal voltage
threshold VPRECHG within the pre-charge timer period a fault condition is detected and the charger is turned off.
If the TMR pin is left floating, an internal resistor of 50 K
(typ) is used to generate the time base used to set the
pre-charge timeout value. The typical pre-charge timeout value can be then calculated as:
TPRECHG = KPRE × 50K × KTMR
As a safety mechanism the TPS65810 has a user-programmable timer that measures the total fast charge time.
This timer (charge safety timer) is started at the end of the pre-conditioning period. The safety charge timeout
value is set by the value of an external resistor connected to the TMR pin RTMR). The charge safety timer
time-out value is calculated as follows:
TCHG = KTMR × RTMR
When the charger is in suspend mode, set via I2C register CHG_CONFIG bit CHGON or set by a pack
temperature fault, the charge safety timer is put on hold (i.e., charge safety timer is not reset). Normal operation
resumes when the charger exits the suspend mode. If charge termination is not reached within the timer period a
fault condition is detected, and the charger is turned off.
The charge safety timer is held in reset if the TMR pin is left floating. Under this mode of operation an internal
resistor, 50K
typical, sets the internal charger and power path deglitch and delay times, as well as the
pre-charge safety timer timeout value.
The TPS65810 provides a recovery method to deal with timer fault conditions. The following summarizes this
method:
Condition 1: Charge voltage above recharge threshold, V
RCH, and timeout fault occurs.
Recovery method: The IC waits for the battery voltage to fall below the recharge threshold. This could happen
as a result of a load on the battery, self-discharge or battery removal. Once the battery falls below the recharge
threshold, the IC clears the fault and starts a new charge cycle.
Condition 2: Charge voltage below recharge threshold,V
(RCH), and timeout fault occurs.
Recovery method: Under this scenario, the IC connects an internal pullup resistor from OUT pin to BAT pin.
This pullup resistor is used to detect a battery removal condition and remains on as long as the battery voltage
stays below the recharge threshold. If the battery voltage goes above the recharge threshold, the IC disables the
pullup resistor connection and executes the recovery method described for condition 1.
All timers are reset and all timer fault conditions are cleared when a new charge cycle is started either via I2C
(toggling CHG_CONFIG bits CE, CHGON) or by cycling the input power. All timers are reset and all timer fault
conditions are cleared when the TPS65810 enters the UVLO mode.
The charge and pre-charge safety timers are programmed by the user to detect a fault condition if the charge
cycle duration exceeds the total time expected under normal conditions. The expected total charge time is
usually calculated based on the fast charge current rate.
When the thermal loop or the DPPM loops are activated the charge current is reduced, and a false safety timer
fault can be observed if this mode of operation is active for a long periods. To avoid this undesirable fault
condition the TPS65810 activates the dynamic timer function when the DPPM and thermal loops are active. The
dynamic timer function slows down the safety timers clock, effectively adding an extra time to the programmed
timeout value as follows:
1. If the battery voltage is below the battery depleted threshold: the pre-charge timer value is modified while the
thermal loop or the DPPM loop are active
2. If the battery voltage is above the pre-charge threshold: the safety timer value is modified if the DPPM or the
Copyright 2006–2007, Texas Instruments Incorporated
51
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相關代理商/技術參數 |
參數描述 |
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| TPS65810RTQTG4 | 功能描述:電池管理 Int Sgl-Cell Lit-Ion Batt & Pwr Mgmt IC RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TPS65811RTQR | 功能描述:電池管理 Integr S-C Li-Ion RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TPS65811RTQRG4 | 功能描述:電池管理 Integr S-C Li-Ion RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TPS65811RTQT | 功能描述:電池管理 Integr S-C Li-Ion RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| TPS65811RTQTG4 | 功能描述:電池管理 Integr S-C Li-Ion RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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