參數(shù)資料
型號： L6924D013TR
廠商： STMICROELECTRONICS
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16
封裝： 3 X 3 MM, VFQFPN-16
文件頁數(shù)： 9/38頁
文件大?。?/td> 1454K
代理商： L6924D013TR
L6924D
Applications information: charging process
Doc ID 11908 Rev 9
17/38
7.2
Pre-charge current
The L6924D allows pre-charging the battery with a low current when the battery voltage is
lower than a specified threshold (VPRETH). The Pre-charge current has a default value equal
to 10% of the fast-charge current. However it can be adjusted by connecting a resistor from
the IPRE pin to GND or VREF (see Figure 10). When the resistor is connected between IPRE
pin and GND, the current is higher than the default value. The RPRE value is given by:
Equation 6
Figure 10.
IPRE pin connection
When RPRE is connected to VREF, the current is lower than the default value. VREF is the
external reference equal to 1.8 V, VBG is the internal reference equal to 1.23 V and KPRE is a
constant equal to 950. See Figure 11.
The relationship is shown in the equation 7:
Equation 7
Figure 11.
IPRE pin connection
7.3
Pre-charge voltage
If the VPRE pin is floating, a default value of VPRETH is set, equal to 2.8 V (VPRETHDefault).
Otherwise, the device offers the possibility to program this value, with a resistor connected
between the VPRE pin and GND (see Figure 12). In this case, the RVPRE is given by the
equation 8:
PRG
BG
PRE
PRECH
BG
PRE
R
V
K
I
V
R
=
L6924D
I
PRE
L6924D
I
PRE
PRE
PRECH
PRG
BG
REF
PRE
K
I
R
V
R
=
V
REF
L6924D
I
PRE
V
REF
L6924D
I
PRE
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相關代理商/技術參數(shù)
參數(shù)描述
L6924U 功能描述:電池管理 USB Battery Charger System w/integra 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
L6924U013TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer
L6924UTR 功能描述:電池管理 Battery Charger USB Compatible 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
L6925 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR
L6925013TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR
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