Only For Training And Service Purposes - LG TU750 Service Manual

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.
Parameter
Trickle current
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).
(a) Charging voltage
(b) Charging current
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Only for training and service purposes

Min
30
Table. 3-5-4. Trickle charging spec
Fig. 3-5-8. CCCV charging method
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3. TECHNICAL BRIEF
Typ Max
50 60
Unit
mA
LGE Internal Use Only