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參數資料
| 型號： | TPS40211DRCTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | GREEN, PLASTIC, SON-10 |
| 文件頁數： | 20/47頁 |
| 文件大小： | 1375K |
| 代理商： | TPS40211DRCTG4 |
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OUT
IN(max)
FD
MIN
OUT
FD
V
24 V 14 V
0.5 V
D
42.9%
V
24 V
0.5 V
-
+
-
+
=
+
OUT
IN(m in)
FD
MAX
OUT
FD
V
24 V
8 V
0.5 V
D
67.3%
V
24 V
0.5 V
-
+
-
+
=
+
OUT(max)
RIPPLE(max)
MIN
I
2
I
0.3
1.05 A
1 D
1 0.429
=
=
=
-
IN(max)
MIN
RIPPLE(max)
SW
V
1
14 V
1
L
D
0.429
9.5 H
I
1.05 A
600kHz
=
=
m
f
IN
RIPPLE(V typ)
SW
V
1
12 V
1
I
D
0.50
1.02 A
L
10 H
600kHz
=
=
m
f
in
IN
RIPPLE(Vinmin)
SW
V
1
8 V
1
I
D
0.673
0.90 A
L
10 H
600kHz
=
=
m
f
( )
( ) (
)
(
)
( )
(
)
2
OUT(max)
1
Lrms
RIPPLE
RIPPLE(VINmin)
L avg
12
MAX
I
2
I
0.90A
6.13 Arms
1 D
1 0.673
=
+
+
=
+
=
÷
÷
÷
-
è
è
( )
OUT(max)
1
Lpeak
RIPPLE(Vinmin)
2
MAX
I
2
I
0.90
6.57 A
1 D
1 0.673
+
=
+
=
-
www.ti.com
SLUS772D – MARCH 2008 – REVISED APRIL 2010
Table 2. TPS40210 Design Example Specifications (continued)
PARAMETER
CONDITIONS
MIN NOM
MAX
UNIT
SYSTEM CHARACTERISTICS
fSW
Switching frequency
600
kHz
hPK
Peak efficiency
VIN = 12 V
95%
h
Full load efficiency
VIN = 12 V, IOUT = 2 A
94%
TOP
Operating temperature range
8 V
≤ VIN ≤ 14 V, IOUT ≤ 2 A
25
°C
MECHANICAL DIMENSIONS
W
Width
1.5
L
Length
1.5
in
h
Height
0.5
Step-By-Step Design Procedure
Duty Cycle Estimation
The duty cycle of the main switching MOSFET is estimated using Equation 32 and Equation 33.
(32)
(33)
Using an estimated forward drop (VFD) of 0.5 V for a schottky rectifier diode, the approximate duty cycle is 42.9%
(minimum) to 67.3% (maximum).
Inductor Selection
The peak-to-peak ripple is chosen to be 30% of the maximum input current.
(34)
The minimum inductor size can be estimated using Equation 35.
(35)
The next higher standard inductor value of 10 mH is selected. The ripple current for nominal and minimum VIN is
estimated by Equation 36 and Equation 37.
(36)
(37)
The worst case peak-to-peak ripple current occurs at 50% duty cycle (VIN = 12.25 V) and is estimated as 1.02 A.
Worst case RMS current through the inductor is approximated by Equation 38.
(38)
The worst case RMS inductor current is 6.13 Arms. The peak inductor current is estimated by Equation 39.
(39)
Copyright 2008–2010, Texas Instruments Incorporated
27
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