Datasheet

TPS40192, TPS40193
SLUS719E –MARCH 2007–REVISED MAY 2013 www.ti.com
DEFINITION OF SYMBOLS
Table 8. Definition of Symbols
SYMBOL DESCRIPTION
V
IN(max)
Maximum Operating Input Voltage
V
IN(min)
Minimum Operating Input Voltage
V
IN(ripple)
Peak to Peak AC ripple voltage on V
IN
V
OUT
Target Output Voltage
V
OUT(ripple)
Peak to Peak AC ripple voltage on V
OUT
I
OUT(max)
Maximum Operating Load Current
I
RIPPLE
Peak-to-Peak ripple current through Inductor
I
L(peak)
Peak Current through Inductor
I
L(rms)
Root Mean Squared Current through Inductor
I
RMS(Cin)
Root Mean Squared Current through Input Capacitor
f
SW
Switching Frequency
f
CO
Desired Control Loop Crossover frequency
A
MOD
Low Frequency Gain of the PWM Modulator ( V
OUT
/ V
CONTROL
)
V
CONTROL
PWM Control Voltage (Error Amplifier Output Voltage V
COMP
)
f
RES
L-C Filter Resonant Frequency
f
ESR
Output Capacitors' ESR zero Frequency
F
P1
First Pole Frequency in Error Amplifier Compensation
F
P2
Second Pole Frequency in Error Amplifier Compensation
F
Z1
First Zero Frequency in Error Amplifier Compensation
F
Z2
Second Pole Frequency in Error Amplifier Compensation
Q
G1
Total Gate Charge of Main MOSFET
Q
G2
Total Gate Charge of SR MOSFET
R
DS(on)Q1
"ON" Drain to Source Resistance of Main MOSFET
R
DS(on)Q2
"ON" Drain to Source Resistance of SR MOSEFT
P
Q1C(on)
Conduction Losses in Main Switching MOSFET
P
Q1SW
Switching Losses in Main Switching MOSFET
P
Q2C(on)
Conduction Losses in Synchronous Rectifier MOSFET
Q
GD
Gate to Drain Charge of Synchronous Rectifier MOSFET
Q
GS
Gate to Source Charge of Synchronous Rectifier MOSFET
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