LG C1100 Service Manual page 33

3. TECHNICAL BRIEF
In order to reduce time for trickle charging, additional circuit (Pre-charge circuit) was included.
This circuit has supplied a 50mA current into the battery additionally.
So call it, it reduce trickle charging time
VMEM
C409 39p
R405
SPKN
NA
R406
SPKP
NA
R407
0
R409
0
C406 C407
Closed to Analog SW
47p 47p
R414
RECP
4.7
R416
RECN
4.7
C411 C412
47p 47p
Figure 3-20. MAIN RECEIVER CIRCUIT
PRE_CHARGE
VCHARGE
VBAT
C187
CUS02
10u Current Sense
D101
R107 0.2
1%
R108 CLOSE TO BATTERY PACK
330
Q103
4 5
G S
3 6
D3 D4
2 7
D2 D5
1 8
D1 D6
TPCF8102
Figure 3-21. CHARGING CIRCUIT
U402
MAX4684EUB
1 10
V+ NO2
2 9
NO1 COM2
3 8
COM1 IN2
4 7
IN1 NC2
C410
5 6
NC1 GND
R415 100K
VCHARGE
C140
R162
49.9
0.1u
R155
NA
UMX1NTN
3
R157
2
R165
1.5K
100K
1
- 32 -
SPK_REC_N
47p
SPK_REC_P
SPK_RCV_SEL
VBAT
R163
R164
0
1K
4
RED_LED
5
6
Q104