參數(shù)資料
型號(hào)： L6924U
廠商： STMICROELECTRONICS
元件分類： 電源管理
英文描述： POWER SUPPLY SUPPORT CKT, QCC16
封裝： 3 X 3 MM, ROHS COMPLIANT, VFQFP-16
文件頁數(shù)： 10/38頁
文件大?。?/td> 598K
代理商： L6924U
Applications information: charging process
L6924U
18/38
7.2
Pre-charge phase
The L6924U allows pre-charging the battery with a low current when the battery is deeply
discharged.
The battery is considered deeply discharged when its voltage is lower than a threshold
(VPRETH), internally set to 3 V.
During pre-charge phase, the current (IPRECH) has a default value equal to 10 % of the fast-
charge current.
A safety timer is also present. If the battery voltage does not rise over VPRETH within this
If at the beginning of the charge process, the battery voltage is higher than the VPRETH, the
pre-charge phase is skipped.
7.3
AC or USB mode
The L6924U can charge batteries from both AC adapter and USB inputs.
The choice of the power supply is done by driving the MODE pin.
A low level sets the L6924U in AC mode. The fast charge current is determined by the
resistor connected to the IAC pin (Chapter 7.4: Fast charge phase), regardless the resistor
connected to IUSB.
The same way, a high level at the MODE pin sets the L6924U in USB mode. The fast charge
current is determined by the resistor connected to the IUSB pin (Chapter 7.4: Fast charge
phase), regardless the resistor connected to IAC.
Figure 10.
MODE pin selection
I
AC
R
AC
L6924U
MODE
AC adapter mode
R
USB
I
AC
R
AC
L6924U
MODE
USB mode
R
USB
I
USB
V
IN
I
USB
Sets the fast charge current
I
AC
R
AC
L6924U
MODE
AC adapter mode
R
USB
I
AC
R
AC
L6924U
MODE
USB mode
R
USB
I
USB
V
IN
I
USB
Sets the fast charge current
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參數(shù)描述
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