TPS54383, TPS54386
www.ti.com
SLUS774B–AUGUST 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)
Output Capacitor
COUT
D(max)
D(min)
Maximum steady state operating duty cycle
Minimum steady state operating duty cycle
Maximum allowable output capacitor ESR
Switching frequency
ESR(max)
fSW
IBP
Output Current of BP regulator due to external loads
Switching quiescent current with no load on BP
Average diode conduction current
IDD
ID(avg)
ID(peak)
IIN(avg)
IIN(rms)
IL(avg)
Peak diode conduction current
Average input current
Root mean squared (RMS) input current
Average inductor current
IL(rms)
Root mean squared (RMS) inductor current
Peak current in inductor
IL(peak)
ILRIP(max)
L(min)
Maximum allowable inductor ripple current
Minimum inductor value to maintain desired ripple current
Maximum designed output current
IOUT(max)
IRMS(cin)
IRIPPLE
IQSW(rms)
PCON
Root mean squared (RMS) current through the input capacitor
Inductor peak to peak ripple current
Root mean squared current through the switching MOSFET
Power loss due to conduction through switching MOSFET
Maximum power dissipation in diode
PD(max)
RDS(on)
PSW
Drain to source resistance of the switching MOSFET when “ON”
Power loss due to switching
PREG
Power loss due to the internal regulator
Output Voltage of BP regulator
VBP
V(BR)R(min)
VFB
Minimum reverse breakdown voltage rating for rectifier diode
Regulated feedback voltage
VFD
Forward voltage drop across rectifier diode
Power stage input voltage
VIN
VOUT
Regulated output voltage
VRIPPLE(cap)
VRIPPLE(tot)
Peak to Peak ripple voltage due to ideal capacitor (ESR = 0ꢀ
)
Maximum allowable peak to peak output ripple voltage
Copyright © 2007, Texas Instruments Incorporated
Submit Documentation Feedback
41
Product Folder Link(s): TPS54383 TPS54386
TI [ TEXAS INSTRUMENTS ]
