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L6924D Fiches technique(PDF) 27 Page - STMicroelectronics

No de pièce L6924D
Description  Battery charger system with integrated power switch for Li-ION/Li-POLYMER
PDF  38 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6924D Fiches technique(HTML) 27 Page - STMicroelectronics

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L6924D
Application information: monitoring and protection
27/38
Similarly, when the battery is at the high temperature limit, the TH pin voltage is 225mV. The
correct resistance ratio to set the high temperature limit at 50°C can be found with the following
formula:
Where RNTC50°C is the value of the NTC at 50°C. Considering VMAXTH = 225mV it follows that:
Consequently:
Based on equations 9-3 and 9-6, it derives that:
The temperature hysteresis can be estimated by the formula:
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:
Obviously at the high temperature hysteresis is:
Considering typical values for NTC0°C and NTC50°C, the hysteresis is:
And:
C
NTC
UP
C
NTC
REF
MAXTH
R
R
R
V
V
°
°
+
×
=
50
50
Eq: 9-4
C
NTC
UP
C
NTC
R
R
R
°
°
+
×
=
50
50
8
.
1
225
.
0
Eq: 9-5
7
50
UP
C
NTC
R
R
=
°
Eq: 9-6
7
50
0
=
°
°
C
NTC
C
NTC
R
R
Eq: 9-7
T
TH
HYS
TH
TH
HYS
NTC
V
V
V
T
×
−
=
_
Eq: 9-8
C
NTC
mV
mV
mV
T
C
HYS
°
×
−
=
°
0
900
780
900
0
Eq: 9-9
C
NTC
mV
mV
mV
T
C
HYS
°
×
−
=
°
50
225
248
225
50
Eq: 9-10
C
mV
mV
mV
T
C
HYS
o
5
.
2
051
.
0
900
780
900
0
≅
×
−
=
°
Eq: 9-11
C
mV
mV
mV
T
C
HYS
o
5
.
2
039
.
0
225
248
225
50
−
≅
×
−
=
°
Eq: 9-12



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