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L6924UTR Datasheet(PDF) 26 Page - STMicroelectronics

Part # L6924UTR
Description  USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6924UTR Datasheet(HTML) 26 Page - STMicroelectronics

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Application information: monitoring and protection
L6924U
26/37
Doc ID 14716 Rev 2
Based on Equation 14 and Equation 17, it derives that:
Equation 18
The temperature hysteresis can be estimated by the equation:
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 low
temperature, the hysteresis is approximately:
Equation 20
Obviously at high temperature hysteresis is:
Equation 21
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.
7
50
0
=
°
°
C
NTC
C
NTC
R
R
T
TH
HYS
TH
TH
HYS
NTC
V
V
V
T
×
−
=
_
C
NTC
mV
mV
mV
T
C
HYS
°
×
−
=
°
0
900
780
900
0
C
NTC
mV
mV
mV
T
C
HYS
°
×
−
=
°
50
225
248
225
50
C
mV
mV
mV
T
C
HYS
o
5
.
2
051
.
0
900
780
900
0
≅
×
−
=
°
C
mV
mV
mV
T
C
HYS
o
5
.
2
039
.
0
225
248
225
50
−
≅
×
−
=
°



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