6 pn Diode Applications - Part 2

6 pn Diode Applications - Part 2 - pn-Diode Applications...

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Unformatted text preview: pn-Diode Applications Part 2 ↓Voltage Regulator:- Maintaining VoutputAgainst Vinput(input voltage) & IL(load current) change "Regulated Power Supply"There are two situations to consider:- (i)where the Viis fixed and RLwill change (ii)where the RLis fixed and Viwill change VottViVi(min)Vi(max)Zener Diode:- Use a Zener diode operating in its reversevoltage breakdown condition. Special Region →Zener Region →Zener Diode Due to :- Ionization process a166Avalanche breakdown Tunneling effect a166Quantum effect a166Zener effect 0V ⇔VZ →~open circuit (OFFstate)≥VZ→~ short circuit ( ON state)VZ- Zener potential, Zener Voltage ( ∼2 - 200Volt ) RVZ+-Vo+-IZVi(5V)Vo= ViVo= 5VIZ ~ 0A Vi↑→IZ ↑Power dissipatedby the Zener diode ⇒PZ= IZVZThe amount of power the Zener diode can withstand IZMVZis a limiting factorin power supply design!! PZ< IZMVZPZM(= IZMVZ) , IZM ,VZ-from data sheet PZM= IZMVZ= (100mA)(5V) = 0.5W XtimeVodamageVZVo = VZ = 5VVo = ViIZ > IZM5VIZ > 100mARVVIZiz-=timeViVZ5VIDVDVZISZenerRegionIZM(100mA)5VConditions:- PZ= IZVZPZ< IZMVZ IZ< IZM For a given R , RLand IZM→R →limit IZ< IZM RVZ+-VoRL+--+IRILIZViVitimeLZRIII+=(max)(min)VVVi<<XtimeVodamageVZVo = VZVo = Vi ??IZ > IZMiLLoVRRRV+=RVZ+-VoRL+--+IRILIZViViVyVxVZtViVyVxVZVot??VZVoVZ??Conditions:- PZ= IZVZPZ< IZMVZ IZ< IZM For a given R , Viand IZM→RVZ+-VoRL+--+IRILIZViRLtimeLZRIII+=(max)(min)LLLRRR<<XtimeVodamageVZVo = VZIZ > IZMiLLoVRRRV+=Voltage Regulator:- Maintaining VoutputAgainst Vinput(input voltage) & IL(load current) change "Regulated Power Supply"There are two situations to consider:- (i)where the Viis fixed and RLwill change (ii)where the RLis fixed and Viwill change R+-inputVΔLoadRΔinputVΔLoadRΔVZVZVoVoThere are two situations to consider:- (i)where the Viis fixed and RLwill change (ii)where the RLis fixed and Viwill change ZiLLoVVRRRV=+=LZRIII+=LZZZiRVIRVV+=-RVZ+-RL ( =Vo )+-IRILIZViCase...
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6 pn Diode Applications - Part 2 - pn-Diode Applications...

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