SLMA002 datasheet(41/55 Pages) TI1

41 / 55 page

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TPS54283,, TPS54286

SLUS749C – JULY 2007 – REVISED OCTOBER 2007

Table 4. Definition of Symbols

CDJ

Average junction capacitance of the rectifier diode from 0V to VIN(max)

COSS

Average output capacitance of the switching MOSFET from 0V to VIN(max)

COUT

Output Capacitor

D(max)

Maximum steady state operating duty cycle

D(min)

Minimum steady state operating duty cycle

ESR(max)

Maximum allowable output capacitor ESR

fSW

Switching frequency

IBP

Output Current of BP regulator due to external loads

IDD

Switching quiescent current with no load on BP

ID(avg)

Average diode conduction current

ID(peak)

Peak diode conduction current

IIN(avg)

Average input current

IIN(rms)

Root mean squared (RMS) input current

IL(avg)

Average inductor current

IL(rms)

Root mean squared (RMS) inductor current

IL(peak)

Peak current in inductor

ILRIP(max)

Maximum allowable inductor ripple current

L(min)

Minimum inductor value to maintain desired ripple current

IOUT(max)

Maximum designed output current

IRMS(cin)

Root mean squared (RMS) current through the input capacitor

IRIPPLE

Inductor peak to peak ripple current

IQSW(rms)

Root mean squared current through the switching MOSFET

PCON

Power loss due to conduction through switching MOSFET

PD(max)

Maximum power dissipation in diode

RDS(on)

Drain to source resistance of the switching MOSFET when “ON”

PSW

Power loss due to switching

PREG

Power loss due to the internal regulator

VBP

Output Voltage of BP regulator

V(BR)R(min)

Minimum reverse breakdown voltage rating for rectifier diode

VFB

Regulated feedback voltage

VFD

Forward voltage drop across rectifier diode

VIN

Power stage input voltage

VOUT

Regulated output voltage

VRIPPLE(cap)

Peak to Peak ripple voltage due to ideal capacitor (ESR = 0

)

VRIPPLE(tot)

Maximum allowable peak to peak output ripple voltage

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