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)： 20/38頁(yè)
文件大?。?/td> 598K
代理商： L6924U
L6924U
Application information: monitoring and protection
27/38
Considering typical values for NTC0°C and NTC50°C, the hysteresis is:
Equation 22
And:
Equation 23
If a PTC connected to GND is used, the selection is the same as above, the only difference
is when the battery temperature increases, the voltage on the TH pin increases, and vice
versa. For applications that do not need a monitor of the battery temperature, the NTC can
be replaced with a simple resistor whose value is one half of the pull-up resistor RUP.
In this case, the voltage at the TH pin is always inside the voltage window, and the charge is
always enabled.
8.2
Battery absence detection
This feature provides a battery absent detection scheme to detect the removal or the
insertion of the battery. If the battery is removed, the charge current falls below the IENDTH.
At the end of de-glitch time, a detection current IDETECT, equal to 1 mA, is sunk from the
output for a time of TDETECT. The device checks the voltage at the output. If it is below the
VPRETH, a current equal to IDETECT is injected in the output capacitor for a TDETECT, and it is
checked to see if the voltage on the output goes higher than VRCH (4.05 V). If the battery
voltage changes from VPRETH to VRCH and vice versa in a TDETECT time, it means that no
battery is connected to the charger. The TDETECT is expressed by:
Equation 24
C
mV
T
C
HYS
o
5
.
2
051
.
0
900
780
900
0
×
=
°
C
mV
T
C
HYS
o
5
.
2
039
.
0
225
248
225
50
×
=
°
3
10
54
×
= MAXCH
DETECT
T
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