BQ24100_07 Datasheet, PDF (24/36 Pages) Texas Instruments – SYNCHRONOUS SWITCHMODE, LI-ION AND LI-POLYMER CHARGE-MANAGEMENT IC WITH INTEGRATED POWER FETs (bqSWITCHER™)

bq24100, bq24103, bq24103A
bq24105, bq24108, bq24109
bq24113, bq24113A, bq24115
SLUS606K – JUNE 2004 – REVISED NOVEMBER 2007
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6. Determine TTC capacitor (_TTC) for the 5.0 hours safety timer using the following equation:
C_TTC
+
t_CHARGE
K_TTC
C_TTC
+
300 m
2.6 mńnF
C_TTC + 115.4 nF
(20)
Select standard value 100 nF, 16V, X7R, ±10% ceramic capacitor (i.e., Panasonic ECJ-1VB1C104K). Using
this capacitor the actual safety timer will be 4.3 hours.
7. Determine TS resistor network for an operating temperature range from 0°C to 45°C.
VTSB
RT1
TS
RT2
RTH
103AT
Figure 17. TS Resistor Network
Assuming a 103AT NTC Thermistor on the battery pack, determine the values for RT1 and RT2 using the
following equations:
ƪ ƫ V_O(VTSB) RTH_COLD RTH_HOT
1
V_LTF
*
1
V_HTF
RT2 +
RTH_HOT
ǒ Ǔ VO(VTSB)
V_HTF
*
1
* RTH_COLD
ǒ Ǔ VO(VTSB)
V_LTF
*
1
RT1
+
V_O(VTSB)
V_LTF
*
1
1
RT2
)
1
RTH_COLD
(21)
RTH_COLD + 27.28 kW
RTH_HOT + 4.912 kW
RT1 + 9.31 kW
RT2 + 442 kW
(22)
24
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