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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)： | 19/38頁 |
| 文件大?。?/td> | 1454K |
| 代理商： | L6924D013TR |
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Application information: monitoring and protection
L6924D
26/38
Doc ID 11908 Rev 9
Based on Equation 16: and Equation 19: , it derives that:
Equation 20
The temperature hysteresis can be estimated by the equation:
Equation 21
Where VTH is the pin voltage threshold on the rising edge, VTH_HYS is the pin voltage
threshold on the falling edge, and NTCT (-%/°C) is the negative temperature coefficient of
the NTC at temperature (T) expressed in % resistance change per °C. For NTCT values, see
the characteristics of the NTC manufacturers (e.g. the 2322615 series by VISHAY). At the
low temperature, the hysteresis is approximately:
Equation 22
Obviously at the high temperature hysteresis is:
Equation 23
Considering typical values for NTC0°C and NTC50°C, the hysteresis is:
Equation 24
And:
Equation 25
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.
7
50
0
=
°
C
NTC
C
NTC
R
T
TH
HYS
TH
HYS
NTC
V
T
×
=
_
C
NTC
mV
T
C
HYS
°
×
=
°
0
900
780
900
0
C
NTC
mV
T
C
HYS
°
×
=
°
50
225
248
225
50
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
×
=
°
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