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參數(shù)資料
| 型號： | L6924D013TR |
| 廠商： | 意法半導體 |
| 英文描述： | Battery charger system with integrated power switch for Li-ION/Li-POLYMER |
| 中文描述： | 電池為鋰聚合物集成電源開關，充電系統(tǒng) |
| 文件頁數(shù)： | 19/38頁 |
| 文件大小： | 1350K |
| 代理商： | L6924D013TR |
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L6924D
Applications information: charging process
19/38
7.3
Pre-charge voltage
If the V
PRE
pin is floating, a default value of V
PRETH
is set, equal to 2.8V (V
PRETHDefault
).
Otherwise, the device offers the possibility to program this value, with a resistor connected
between the V
PRE
pin and GND
Figure 12
. In this case, the R
VPRE
is given by the equation 8.3:
Figure 12. V
PRE
pin connection
Where R
VPRE
is the resistor between V
PRE
and GND, and R
PRG
is the resistor used to set the
charge current (see
Section 7.4: Fast charge current
), and V
PRETH
is the selected threshold.
A safety timer is also present. If the battery voltage doesn't rise over V
PRETH
, before this time is
expired, a fault is given (see
Section 7.8: Maximum charging time
). If at the beginning of the
charge process, the battery voltage is higher than the V
PRETH
, the Pre-Charge phase is
skipped.
7.4
Fast charge current
When the battery voltage reaches the Pre-charge voltage threshold (V
PRETH
), the L6924D
starts the Fast-charge Phase. In this phase, the device charges the battery with a constant
current, I
CHG
, programmable by an external resistor that sets the charge current with an
accuracy of 7%
Figure 13
. The formula used to select the R
PRG
as follows:
Figure 13. I
PRG
pin connection
Where K
PRG
is a constant, equal to 9500.
During this phase, the battery voltage increases until it reaches the programmed output
voltage. A safety timer is also present. If this time expires, a fault is given (
Section 7.8:
Maximum charging time
).
×
=
lt
PRETHDefau
V
PRETH
V
PRG
VPRE
R
R
Eq: 8-3
V
PRE
L6924D
R
PRE
×
=
CHG
PRG
BG
PRG
I
K
V
R
Eq: 8-4
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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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