Toshiba PROL550 Laptop User Manual


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1HardwareOverview 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.
SatelliteL550MaintenanceManual 1-12
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.
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