參數(shù)資料
型號： TPS40042DRCTG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO10
封裝： 3 X 3 MM, GREEN, PLASTIC, SON-10
文件頁數(shù)： 20/35頁
文件大小： 746K
代理商： TPS40042DRCTG4
www.ti.com
SLUS777 – NOVEMBER 2007
Definition of Symbols
SYMBOL
DESCRIPTION
VIN(max)
Maximum operating input voltage
VIN(min)
Minimum operating input voltage
VINRIPPLE
Peak-to-peak ac ripple voltage on VIN
VOUT
Target output voltage
VOUTRIPPLE
Peak-to-peak ac ripple voltage on VOUT
IOUT(max)
Maximum operating load current
IRIPPLE
Peak-to-peak ripple current through the output filter inductor
IL_PEAK
Peak ripple current through the output filter inductor
IL_RMS
Root mean squared current through the output filter inductor
IRMS_CIN
Root mean squared current in input capacitor
FSW
Switching frequency
FCO
Desired control loop cross-over frequency
AMOD
Low frequency gain of the pulse width modulator
VCONTROL
PWM control voltage (error amplifier output voltage - VCOMP)
FRES
L-C filter resonant frequency
FESR
Output capacitors’ ESR zero frequency
FP1
First pole frequency in error amplifier compensation
FP2
Second pole frequency in error amplifier compensation
FZ1
First zero frequency in error amplifier compensation
FZ2
Second pole frequency in error amplifier compensation
QG1_Q1
Total gate charge of upper switch MOSFET
QG2_Q2
Total gate charge of synchronous rectifier MOSFET
RDS(on_Q1)
“ON” drain-to-source resistance of upper switch MOSFET
RDS(on_Q2)
“ON” drain-to-source resistance of synchronous rectifier MOSEFT
PCON_Q1
Conduction losses in upper switch MOSFET
PSW_Q1
Switching losses in upper switch MOSFET
PCON_Q2
Conduction losses in synchronous rectifier MOSFET
QGD_Q1
Gate-to-drain charge of upper switch MOSFET
Post threshold gate-to-source charge of the upper switch MOSFET. (Estimate from QG vs. VGS if not provided in
QGS2_Q1
MOSFET data sheet)
VFB
Internal reference voltage as measured on FB pin.
VRAMP_slope
Slope of internal PWM ramp
APS(Fco)
VCOMP to VOUT gain at desired loop cross-over frequency. (dB)
AMID-BAND
VOUT to VCOMP gain at desired loop cross-over frequency (V/V)
BWREFIN
Desired frequency bandwidth of the REFIN input.
Copyright 2007, Texas Instruments Incorporated
27
Product Folder Link(s): TPS40042
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