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| 型号： | L6924U |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, QCC16 |
| 封装： | 3 X 3 MM, ROHS COMPLIANT, VFQFP-16 |
| 文件页数： | 19/38页 |
| 文件大小： | 598K |
| 代理商： | L6924U |
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Application information: monitoring and protection
L6924U
26/38
Where RNTC50°C is the value of the NTC at 50 °C. Considering VMAXTH = 225 mV it follows
that:
Equation 16
Consequently:
Equation 17
Based on equations 14 and 17, it derives that:
Equation 18
The temperature hysteresis can be estimated by the formula:
Equation 19
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 20
Obviously at the high temperature hysteresis is:
Equation 21
C
NTC
UP
C
NTC
R
°
+
×
=
50
8
.
1
225
.
0
7
50
UP
C
NTC
R
=
°
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
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