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TPS40100 数据表(PDF) 18 Page - Texas Instruments

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部件名 TPS40100
功能描述  4.5V TO 18V INPUT 10 PIN SYNCHRONOUS BUCK CONTROLLER WITH POWER GOOD
Download  35 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

TPS40100 数据表(HTML) 18 Page - Texas Instruments

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Design Procedure
Selecting the Switching Frequency
Inductor Selection
L [
V
IN(max) * VOUT
0.3
I
OUT
V
OUT
V
IN(max)
1
f
SW
(6)
I
L(rms) +
I
L(avg)
2
)
1
12
I
RIPPLE
2
+
I
OUT
2
)
1
12
I
RIPPLE
2
(7)
Output Capacitor Selection (C8)
V
OVER t
I
TRAN
C
OUT
DT
+
I
TRAN
C
OUT
I
TRAN
L
V
OUT
+
I
TRAN
2
L
V
OUT
C
OUT
(8)
V
UNDER t
I
TRAN
C
OUT
DT
+
I
TRAN
C
OUT
I
TRAN
L
V
IN * VOUT
+
I
TRAN
2
L
V
IN * VOUT
C
OUT
(9)
C
OUT(min) +
I
TRAN(max)
2
L
V
OUT
V
OVER
(10)
ESR
MAX t
V
RIPPLE(tot) * VRIPPLE(cap)
C
OUT
+
V
RIPPLE(tot) *
I
RIPPLE
C
OUT
f
SW
I
RIPPLE
(11)
TPS40192, TPS40193
SLUS719 – MARCH 2007
For this design the TPS40192, with fSW = 600 kHz, is selected to reduce inductor and capacitor sizes.
The inductor is typically sized for approximately 30% peak-to-peak ripple current (IRIPPLE). Given this target ripple
current, the required inductor size can be calculated by Equation 6.
Solving this for
• V
IN(max) = 14 V
• V
OUT = 1.8 V
• I
OUT = 10A
• f
SW = 600 kHz
an inductor value of 0.87
μH is obtained.
A standard value of 1.0
μH is selected. Solving for IRIPPLE with 1.0 μH results in 2.6-A peak-to-peak ripple.
The RMS current through the inductor is approximated by Equation 7.
Using Equation 7, the maximum RMS current in the inductor is approximately 10.03 A
The selection of the output capacitor is typically driven by the output transient response. The Equation 8 and
Equation 9 overestimate the voltage deviation to account for delays in the loop bandwidth and can be used to
determine the required output capacitance.
If
• V
IN(min) > 2 × VOUT, use overshoot to calculate minimum output capacitance.
• V
IN(min) < 2 × VOUT, use undershoot to calculate minimum output capacitance.
Based on a 4-A load transient with a maximum 50 mV overshoot at 8.0 V input, calculate a minimum 178-
μF
output capacitance.
With a minimum capacitance, the maximum allowable ESR is determined by the maximum ripple voltage and is
approximated by Equation 11.
18
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