Charger Control - LG U8120 Service Manual

3.4.10 Charger control

A programmable charger in AB2000 is used for battery charging. It is possible to set limits for the
output voltage at CHSENSE- and the output current from DCIO via the sense resistor to CHSENSE-.
The voltage at CHSENSE- and the current feed to CHSENSE- cannot be measured directly by the
GPADC. Instead, the two measuring amplifiers translate these inputs to a voltage proportional to the
input and within the range of the GPADC. Figure shows the schematic of charging control part.
DCIN_3
C2280
NA
1608
DCIN_2
Q2201
R2214
Si5441DC
1 8
D1 D6 0.1
2 7
D2 D5
3 6
D3 D4
4 5
G S
VBATI
Figure. Schematic of charging control part
Figure. Battery charging block diagram
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3. TECHNICAL BRIEF
E2
DCIO
D1
CHREG
D3
CHSENSE+
D2
CHSENSE-