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參數資料
| 型號： | TPS65820RSHTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC56 |
| 封裝： | 7 X 7 MM, GREEN, PLASTIC, QFN-56 |
| 文件頁數： | 48/98頁 |
| 文件大小： | 2290K |
| 代理商： | TPS65820RSHTG4 |
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CHARGER OFF MODE
PRECHARGE SAFETY TIMER
CHARGE SAFETY TIMER
TIMER FAULT RECOVERY
SLVS663B – MAY 2006 – REVISED APRIL 2008 .............................................................................................................................................................. www.ti.com
The TPS65820 charger circuitry enters the low-power OFF mode if both AC and USB power are not detected.
This feature prevents draining the battery during the absence of input supply.
The TPS65820 activates an internal safety timer during the battery pre-conditioning phase. The precharge safety
timer time-out value is set by the external resistor connected to TMR pin, RTMR, and the timeout constants KPRE
and KTMR :
tPRECHG = KPRE × RTMR × KTMR
The KPRE constant typical value is 0.1, setting the precharge 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 precharge 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 precharge timer period a fault condition is detected and the charger is turned off.
If the TMR pin is left floating and internal resistor, 50 k
typ, is used to generate the timebase used to set the
precharge timeout value. The typical precharge timeout value can be then calculated as :
TPRECHG = KPRE × 50K × KTMR
As a safety mechanism the TPS65820 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 or if the control bit TERM_OFF,in the
CHG_EN I2C register, is set to HI. Under this mode of operation an internal resistor, 50 k
typ, sets the internal
charger and power path deglitch and delay times, as well as the precharge safety timer timeout value.
The TPS65820 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 TPS65820 enters the UVLO mode.
52
Copyright 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS65820
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