MC44608P40 Ver la hoja de datos (PDF) - ON Semiconductor

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MC44608P40

Few External Components Reliable and Flexible SMPS Controller

ON Semiconductor 

MC44608

EQUATION 1

Startup Phase Duration:

tstart–up + CVcc

(Vstup * UVLO2)

Istup

where: Istup is the startup current flowing through VCC pin

CVcc is the VCC capacitor value

EQUATION 2

Switching Phase Duration:

tswitch + CVcc

(Vstup * UVLO1)

IccS ) IG

where: IccS is the no load circuit consumption in switching phase

IG is the current consumed by the Power Switch

EQUATION 3

Latched−off Phase Duration:

tlatched*off + CVcc

(UVLO1 * UVLO2)

IccL ) Ipin3

where: IccL is the latched off phase consumption

Ipin3 is the current drawn from pin3 adding a resistor

EQUATION 4

Burst Mode Duty Cycle:

dBM

+

tstart*up

)

tswitch

tswitch )

tlatched*off

EQUATION 5

dBM + CVcc

CVcc (Vstup *UVLO1)

IccS) IG

(Vstup *

Istup

UVLO2)

)

CVcc

(Vstup

IccS)

*UVLO1)

IG

)

CVcc

(UVLO1*UVLO2)

IccL) Ipin3

EQUATION 6

ǒ dBM +

1 ) kSńStup

1

Ǔ ǒ IccS) IG

Istup

)

kSńL

Ǔ IccS) IG

IccL) Ipin3

where: kS/Stup = (Vstup − UVLO2)/(Vstup − UVLO1)

kS/L = (UVLO1 − UVLO2)/(Vstup − UVLO1)

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