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Only for training and service purposes
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3. TECHNICAL BRIEF
Trickle charging
When the VBAT is below a certain value, 3.2V, a current generator take care of internal trickle charge
signal is active. The charging current is set to 50mA.
Table. 3-5-4. Trickle charging spec
Parameter
Min
Typ
Max
Unit
Trickle current
30
50
60
mA
Normal charging
When the VBAT voltage is within limits or the internal regulators are turned on, the current source
for trickle charging is turned off and all parts of the charging block are active. The charging method
is ‘CCCV’. (Constant Current Constant Voltage)
This charging method is used for Lithium chemistry battery packs. The CCCV method regulates the
charge current and the VBAT voltage. This charging method prevents the battery voltage to go
above the charge set in the CCCV algorithm. (Fig.2-5-8) shows the charging voltage(a) and charging
current change(b).
(b) Charging current
(a) Charging voltage
Fig. 3-5-8. CCCV charging method
Содержание TU750
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