LG KU580 Service Manual - Page 63

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. Parameter Min Typ Max Unit Trickle current 30 50 60 mA Table. 3-5-4. Trickle charging spec 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 LGE Internal Use Only Fig. 3-5-8. CCCV charging method - 64 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes