AN4501 datasheet(39/48 Pages) STMICROELECTRONICS

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AN4501

Glossary

Appendix A

Glossary

In this document, currents and voltages with lower case character refer to the instantaneous

parameter whereas the higher case characters refer to the DC or average values. For

example iL represents the instantaneous inductor current and IL designates the DC inductor

current.

The subscripts MIN and MAX refer to the minimum and to the maximum values. The

subscripts PEAK and PP refer to the peak and to the peak-to-peak value. The subscript RMS

refers to the RMS value.

Table 4. Notations and abbreviations

Notation

Description

IIN, VIN

Input current and voltage

IOUT,VOUT

Output current and voltage

VFLED

Single LED forward voltage

FSW

Converter’s switching frequency

Converter’s period = 1/ FSW

IL, VL

Inductor voltage and current

Inductor and inductance

LBOUNDARY

Inductance operating at the boundary between CCM and DCM

IL,PEAK

Inductor peak current

IL,VALLEY

Inductor valley current

IL,PP

Inductor peak-to-peak current

IL,PP@VINMIN

IL,PP at VIN,MIN

tON, tOFF

Converter’s on-time, off-time

Converter’s duty cycle = tON/T

VFDIODE

Forward voltage of freewheeling diode

RTHJ-AMB,D

Junction-to-ambient thermal resistance of the freewheeling diode

RTHJ-AMB,M1

Junction-to-ambient thermal resistance M1

Boost switching MOSFET

Dimming MOSFET

IM1 ,VM1

M1 drain-source current and voltage

VM1,GS

M1 gate-source voltage

vM1,GS,TH

Threshold voltage of vM1,GS

vM1,DS

Drain-Source voltage of M1

CGS

M1 gate-source capacitor

CGD

M1 gate-drain capacitor

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