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Hometabtoapply2tothetextthatyouwanttoappearhere.1HARDWAREOVERVIEW
1.4 PowerSupply
Thepowersupplyunitprovidesconstantvoltage(19V)forthesystemboardandperformsthe followingfunctions:
1. Powerinputmonitor
CheckswhethertheACadapter(DCpowersupply)isconnectedtothecomputer.
Checkswhetherthebatterypackisconnectedtothecomputer.
MonitorstheDCpowersupplyinputvoltage(ACAdapteroutputvoltage).
2. Powersupply'sinternalcontrol
Turnsonandoffthebatterypackchargingpowersupply.
IssuesachargingcurrentinstructiontothePWMcontrolICofthebatterypackcharging powersupply.
ControlsthesupplyofDCpowersupplyinput(ACAdapteroutput)tothepowersupply unit.
Controlsthesupplyofpowertothesystemblock(load/logiccircuitside). Controlsforcedshutdownifthepowersupplymalfunctions.
3. Logiccircuitcontrol
Instructsthegatearraytoenable/disabletuningthepoweron.
4. Statusdisplay
TurnsonthePowerLED(inGreen).
Batteryindicator(inGreenorAmber).
5. Externalinterface
PerformscommunicationthroughtheI2Cbus(viatheinternalEC/KBC).
Transfersthepowersupplyoperationmode.
SATELLITEL500DMAINTENANCEMANUAL |