3. TECHNICAL BRIEF
- 52 -
3.15. USB charging circuit
The USB charging circuit is a fully integrated USB VBUS voltage single-cell Li-ion battery charger
circuit. The charger uses a CC/CV charge profile required by Li-ion batteries. CC charging current and
End of charging current is programmable I
REF
& I
MIN
resistors.
I
REF
resistor between this pin and the GND pin to set the charge current limit determined by the
following equation:
I
CC
= 12089/30K = 400mA
The End Of Charging current is set by I
MIN
That can be programmed by the as following equation:
I
EOC
= 11000/110K = 100mA
Figure 25 USB charging circuit
USB CHARGING
(1%)
30K
R126
VBAT
2V72_IO
TP105
8
BAT
5
GND
IMIN
6
IREF
7
9
PGND
VIN
1
3
_CHG
_EN
4
2
_PPR
ISL6294
U106
110K
R125
C129
1u
1u
C128
100K
R118
USB_VBUS
USB_CHG_EN
USB_EOC
Summary of Contents for Prada KE850
Page 1: ...Date March 2007 Issue 1 0 Service Manual Model KE850 Service Manual KE850 ...
Page 3: ... 4 ...
Page 5: ... 6 ...
Page 71: ...4 PCB layout 72 Main PCB bottom Main PCB bottom placement ...
Page 115: ... 116 6 Download S W upgrade 6 Press the START button ...
Page 117: ...6 Download S W upgrade 118 KE850 KE850P40 7 V09a KE850 KE850P40 7 V09a ...
Page 127: ... 128 LGMC 8 pcb layout ...
Page 128: ... 129 LGMC 8 pcb layout ...
Page 129: ... 130 LGMC 8 pcb layout ...
Page 130: ... 131 LGMC 8 pcb layout ...
Page 131: ... 132 8 pcb layout ...
Page 132: ... 133 8 pcb layout ...
Page 133: ... 134 8 pcb layout ...
Page 134: ... 135 8 pcb layout ...
Page 135: ... 136 8 pcb layout ...
Page 136: ... 137 8 pcb layout ...
Page 137: ... 138 ...
Page 149: ... 150 ...
Page 151: ... 152 ...
Page 172: ...Note ...
Page 173: ...Note ...