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(yè)數(shù)： 15/38頁(yè)
文件大?。?/td> 598K
代理商： L6924U
Applications information: charging process
L6924U
22/38
7.8
Maximum charging time
To avoid the charging of a dead battery for a long time, the L6924U has the possibility can
be set a maximum charging time starting from the beginning of the fast-charge phase. This
timer can be set with a capacitor, connected between the TPRG pin and GND. The CTPRG is
the external capacitor (in nF) and is given by the following formula:
Equation 10
Note:
The maximum recommended CTPRG value must be less than 50 nF.
Figure 15.
TPRG pin connection
Where,
RPRG = resistor which sets the current (RUSB or RAC)
VREF = 1.8 V,
KT = 279 x 10
5,
VBG = 1.23 V, and
TMAXCH is the charging time given in seconds.
If the battery does not reach the end-of-charge condition before the time expires, a fault is
issued.
Also during the pre-charge phase there is a safety timer, given by:
Equation 11
If this timer expires and the battery voltage is still lower than VPRETH, a fault signal is
generated, and the charge process finishes.
Note:
When the device is charged in low power USB mode, in order to take into account the
reduced charge current, the maximum charging time is proportionally increased (five times
the maximum charging time calculated with RUSB)
9
10
×
×
=
REF
PRG
BG
T
MAXCH
TPRG
V
R
V
K
T
C
E
MAXCH
MAXPRECH
T
×
=
8
1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
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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
L6925D 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Synchronous Step-Dwn RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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