Sharp VL-H860U

VL-H860U
VL-H880U
VL-H870U
VL-H875U
VL-H890U
14
7-7. MAIN BATTERY CIRCUIT SECTION BLOCK DIAGRAM
Q2903 with FET always is "OFF" at DC input.
SYS 3.3V REG circuit
NON REG 7.2V
ADP-DET
Vcc
DC input lived
DC input "ON" "OFF" detection
Battery voltage detection
BATT.-DET
When the battery is installed , its turned "ON".
CHARGE-ON_L
System microcomputer
VCR-H
RESET
CHG SW
Charge control IC
Current control circuit section
Current detective section
Voltage detective section
LED RedLED Green
Charging : Red light up Completion : Green light up
LED_R LED_G
Vcc
with JACK : OPEN with out JACK : GND Short circuit
DC JACK input
Voltage detective circuit
Q2901
Q2903
Lithium ion battery
V
DC
<11V
V
BATT
=0
Charging off