Toshiba Satellite L500D - 1.4 Power Supply

Error!UsetheHometabtoapply2tothetextthatyouwanttoappearhere.Error!Usethe
Hometabtoapply2tothetextthatyouwanttoappearhere. 1HardwareOverview
SatelliteL500DMaintenanceManual 1-15
1.4 PowerSupply
Thepowersupplyunitprovidesconstantvoltage(19V)forthesystemboardandperformsthe
followingfunctions:
1. Powerinputmonitor
 CheckswhethertheACadapter(DCpowersupply)isconnectedtothecomputer.
 Checkswhetherthebatterypackisconnectedtothecomputer.
 MonitorstheDCpowersupplyinputvoltage(ACAdapteroutputvoltage).
2. Powersupply'sinternalcontrol
 Turnsonandoffthebatterypackchargingpowersupply.
 IssuesachargingcurrentinstructiontothePWMcontrolICofthebatterypackcharging
powersupply.
 ControlsthesupplyofDCpowersupplyinput(ACAdapteroutput)tothepowersupply
unit.
 Controlsthesupplyofpowertothesystemblock(load/logiccircuitside).
 Controlsforcedshutdownifthepowersupplymalfunctions.
3. Logiccircuitcontrol
 Instructsthegatearraytoenable/disabletuningthepoweron.
 Controlspower-on/offoperation.
4. Statusdisplay
 TurnsonthePowerLED(inGreen).
 Batteryindicator(inGreenorAmber).
 DC-INindicator(inGreen)
5. Externalinterface
 PerformscommunicationthroughtheI2Cbus(viatheinternalEC/KBC).
 Transfersthepowersupplyoperationmode.