Toshiba l500d Manual

A SERVICE OF

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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.