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參數(shù)資料
| 型號： | BQ24205DGNR |
| 英文描述： | Fast Recovery Bridge Rectifiers |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 201K |
| 代理商： | BQ24205DGNR |
SLUS501A
–
OCTOBER 2001
11
www.ti.com
APPLICATION INFORMATION
battery charge current
Following a successful pre-conditioning, the bq2420x relies on an external current-limited supply to limit the
charge current to the cell. The bq2420x continues this phase until the battery reaches the voltage regulation
phase.
During this phase (and all other phases of operation) in order to protect the integrated powerFET, the internal
short circuit and thermal protection circuits are active.
battery voltage regulation
The voltage regulation feedback is through the BAT pin. This input is tied directly to the positive side of the
battery pack. The bq2420x monitors the battery-pack voltage between the BAT and VSS pins. The bq2420x
is offered in two fixed-voltage versions: 4.1 V and 4.2 V.
As a safety backup, the bq2420x also monitors the charge time in the voltage regulation mode. If taper current
is not detected within this time period, t
(CHG)
, the bq2420x turns off the charger and enunciates FAULT on the
STAT pin. Fault condition is cleared by POR or battery replacement. Note that the safety timer is reset if the
bq2420x is forced out of the voltage regulation mode.
charge termination and recharge
The bq2420x monitors the charging current during the voltage regulation phase. Once the taper threshold,
I
(TAPER)
, is detected the bq2420x initiates the taper timer, t
(TAPER)
. Charge is terminated after the timer expires.
The bq2420x resets the taper timer in the event that the charge current returns above the taper threshold,
I
(TAPER).
In addition to the taper current detection, the bq2420x terminates charge in the event that the charge current
falls below the I
(TERM)
threshold. This feature allows for quick recognition of a battery removal condition.
After a charge termination, the bq2420x restarts the charge once the voltage on the BAT pin falls below the
V
(RCH)
threshold. This feature keeps the battery at full capacity at all times.
sleep mode
The bq2420x enters the low-power sleep mode if the Vcc is removed from the circuit (i.e. the Vcc and IN pins
are floating). For applications where these pins are not floating, placing a low-power 10
(1/16 W) between
the IN and VCC pins ensures the V
(SLP)
conditions are met (see Figure 9).This feature prevents draining the
battery during the absence of V
CC
.
P
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