LG B2050 Service Manual - Page 38

Circuit For Battery Charging At Ad6537b

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3. TECHNICAL BRIEF T15 NC_T15 NC_R1 R1 R3 VMEMSEL GND_NET1 T5 NC_G16 G16 NC_B7 B7 NC_B5 B5 VBATSENSE B8 VCHG A5 A7 ISENSE GATEDRIVE A6 VBAT VCHARGE NORMAL CHARGING R108 0.2 D100 CUS02 C127 10u R109 330 Q100 G 4 D3 3 D2 2 D1 1 S 5 D4 6 D5 7 D6 8 TPCF8102 VCHARGE VBAT Trickle- C325 CHARGING 0.1u PRECHARGE R355 1.5K R357 10K 3 2 1 IMX9T110 Q301 4 5 6 R353 1K 2012,1% R352 15 R356 47K VBAT C324 0.1u LD306 R350 750 3 2 Q401 2SC5585 1 R358 10K R359 20 Figure 3-21 CIRCUIT FOR BATTERY CHARGING AT AD6537B In order to reduce time for trickle charging, additional circuit(Pre-charge circuit) was included.This circuit has supplied Max 160mA current into the battery additionally. So call it, it reduce trickle charging time - 37 -

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3. TECHNICAL BRIEF
- 37 -
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NORMAL
CHARGING
Trickle-
CHARGING
Figure 3-21 CIRCUIT FOR BATTERY CHARGING AT AD6537B
In order to reduce time for trickle charging, additional circuit(Pre-charge circuit) was included.This circuit
has supplied Max 160mA current into the battery additionally.
So call it, it reduce trickle charging time