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| 型号： | TPS65562RGTTG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A BATTERY CHARGE CONTROLLER, PQCC16 |
| 封装： | GREEN, PLASTIC, QFN-16 |
| 文件页数： | 15/17页 |
| 文件大小： | 632K |
| 代理商： | TPS65562RGTTG4 |
www.ti.com
PRINCIPLES OF OPERATION
CHG
(VOUT)
XFULL
F_ON
G_IGBT
(ENA)
~~
tim
eA
tim
eB
tim
eC
tim
eD
tim
eE
tim
eF
tim
eG
tim
eH
tim
eI
tim
eJ
Start/Stop Charging
Indicate Charging Status
SLVS775 – JUNE 2007
Figure 4. Whole Operation Sequence Chart
TPS65562 has one internal enable latch, F1, that holds the charge enable (ON/OFF status) of the device (see
Figure 4).
The only way to start charging is to input CHG
↑ (see time A/C/H in Figure 4). Each time CHG↑ is applied, the
TPS65562 starts charging.
There are three trigger events to stop charging:
1. Forced stop by inputting CHG = L from the controller (see timeB in Figure 4).
2. Automatic stop by detecting a full charge. VOUT reaches the target value (see TimeD in Figure 4).
3. Protected stop by detecting an overcurrent function (OVDS) trigger at SW pin (see TimeI in Figure 4).
When the charging operation is complete, the TPS65562 drives the charge completion indicator pin, XFULL, to
GND. A controller can detect the status of the device as a logic signal when connected through a pullup resister,
R1 (see Figure 1).
The XFULL output enables the controller to detect the OVDS protection status. If OVDS protection occurs,
XFULL never goes L during CHG = H. Therefore, the controller detects OVDS protection by measuring the time
from CHG high to XFULL low. If the time to XFULL low is longer than the maximum designed charge time, then
an OVDS protection occurred.
The device starts charging at timeH, and OVDS protection occurs at TimeI (see Figure 5). At TimeI, XFULL
stays H. At TimeJ, the controller detects OVDS protection through the expiration of a timer ends and then sets
CHG to low to terminate the operation.
7
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