Sharp SL-5500 Service Manual page 31

PC-UM10M
4. POWER SUPPLY COMPOSITION
DC - DC
Adapter
DC - DC
SW 3
VDT
3.0 V
Reg.
3.1 V
VDT
3.3 V
MAIN Batt.
SW1: Off when the backup battery voltage falls below 2V. (Dis-
charging is inhibited. Charging is allowed.)
SW2: Off when VAB falls below 3V.
During set ON
5VDC/DC=ON (5V output)
SW3 = ON
SW4 = OFF
During set OFF (Main battery voltage >3.3V)
5V DC/DC=ON (3.8V output)
SW3 = OFF
SW4 = ON
1.8 V
VCC-Core
5 V
VCC 5
SW 4
SW 2
3.3 V
VCC 3
DC - DC
3.3 V
DC - DC
VDT
B/U Batt.
2.0 V
SW 1
SL-5500 HARDWARE DESCRIPTION
POWER BLOCK DIAGRAM
950mAh (Discharge max = 2.3A)
5V
DC-DC
Step_up
Inverter
300mA
3.3V
Regurater
(TK11133CS)
SD CARD CF CARD Plus
– 30 –
AC_Adaptor
Battery
Fatal = 3.6V (about)
3.3V
DC-DC DC-DC
Step_Down Step_Down
SDRAM
Mask_ROM
Flash_ROM
IR_Unit
Regurater
(TK11133)
TC35143AF
DAC(PCM1741)
Regurater
(TK11133)
AMP(NJM2172)
3V
Regurater
(TK11133)
5V
FET SW
±15V
Regurater DC-
(TK11133) DC
3.3V or 5V
FET SW
1.8V
CPU
LCD