Philips 32PT740H37A Manual de Serviço descarregar pdf (Página 92)

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• After closing switch 'S', the linear in time increasing current IT, , will charge

capacitor C.

• Opening switch 'S' will generate a counter-e.m.f. in coil L, trying to maintain

current IT. This is possible via diode D (this diode is also called 'freewheel

diode'). So after opening 'S', the magnetic energy stored in coil L will be

transferred to electrostatic energy in capacitor C. The VIN will only supply current

during the time that 'S' is closed while a constant current is flowing through RL.

• VBAT is directly proportional with VIN and the time that 'S' is closed and reverse

proportional with period time 'T'. Therefore, by changing the duty cycle, it will be

possible to control VBAT.

Figure: Main supply circuitry

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