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| 型号： | TPS40192DRCRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件页数： | 13/38页 |
| 文件大小： | 707K |
| 代理商： | TPS40192DRCRG4 |
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L [
V
IN(max) * VOUT
0.3
I
OUT
V
OUT
V
IN(max)
1
f
SW
I
L(rms) +
I
L(avg)
2
)
1
12
I
RIPPLE
2
+
I
OUT
2
)
1
12
I
RIPPLE
2
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
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
C
OUT(min) +
I
TRAN(max)
2
L
V
OUT
V
OVER
ESR
MAX t
V
RIPPLE(tot) * VRIPPLE(cap)
C
OUT
+
V
RIPPLE(tot) *
I
RIPPLE
C
OUT
f
SW
I
RIPPLE
SLUS719C – MARCH 2007 – REVISED AUGUST 2010
www.ti.com
Design Procedure
Selecting the Switching Frequency
For this design the TPS40192, with fSW = 600 kHz, is selected to reduce inductor and capacitor sizes.
Inductor Selection
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
VIN(max) = 14 V
VOUT = 1.8 V
IOUT = 10A
f SW = 600 kHz
(6)
an inductor value of 0.87 mH is obtained.
A standard value of 1.0 mH is selected. Solving for IRIPPLE with 1.0 mH results in 2.6-A peak-to-peak ripple.
The RMS current through the inductor is approximated by Equation 7.
(7)
Using Equation 7, the maximum RMS current in the inductor is approximately 10.03 A
Output Capacitor Selection (C8)
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.
(8)
If
VIN(min) > 2 × VOUT, use overshoot to calculate minimum output capacitance.
VIN(min) < 2 × VOUT, use undershoot to calculate minimum output capacitance.
(9)
(10)
Based on a 4-A load transient with a maximum 50 mV overshoot at 8.0 V input, calculate a minimum 178-mF
output capacitance.
With a minimum capacitance, the maximum allowable ESR is determined by the maximum ripple voltage and is
approximated by Equation 11.
(11)
20
Copyright 2007–2010, Texas Instruments Incorporated
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