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| 型号： | TPS40210QDGQRQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | GREEN, PLATSIC, MSOP-10 |
| 文件页数： | 20/41页 |
| 文件大小： | 999K |
| 代理商： | TPS40210QDGQRQ1 |
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OUT
IN(max)
FD
MIN
OUT
FD
V
24 V 14 V
0.5 V
D
42.8%
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(m ax)
Lrip(m ax)
MIN
I
2
I
0.3
1.05 A
1 D
1 0.428
=
=
=
-
IN(max)
MIN
Lrip(max)
SW
V
1
14 V
1
L
D
0.428
9.5 H
I
f
1.05 A
600kHz
=
=
m
f
IN
RIPPLE
SW
V
1
12 V
1
I
D
0.50
1.02 A
L
10
H
600 kHz
=
=
m
f
IN
RIPPLE(Vinmin)
SW
V
1
8 V
1
I
D
0.673
0.89 A
L
10 H
600kHz
=
=
m
( )
( ) (
)
(
)
( )
(
)
2
OUT(max)
1
Lrms
RIPPLE
RIPPLE(VINmin)
L avg
12
MAX
I
2
I
0.817A
6.13 Arms
1 D
1 0.673
=
+
+
=
+
=
÷
÷
÷
-
è
è
www.ti.com
SLVS861D – AUGUST 2008 – REVISED APRIL 2010
Table 1. TPS40210 Design Example Specifications (continued)
PARAMETER
CONDITIONS
MIN NOM
MAX
UNIT
SYSTEM CHARACTERISTICS
fSW
Switching frequency
600
kHz
hPK
Peak efficiency
VIN = 12 V, 0.2 A ≤ IOUT ≤ 2 A
95%
h
Full load efficiency
VIN = 12 V, IOUT = 2 A
94%
TOP
Operating temperature range
10 V
≤ VIN ≤ 14 V, 0.2 A ≤ 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 and estimated forward drop of 0.5 V for a Schottky rectifier diode, the approximate duty cycle is 42.8%
(minimum) to 67.3% (maximum).
Inductor Selection
The peak-to-peak ripple is limited to 30% of the maximum output 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 is estimated by Equation 36.
(36)
(37)
The worst-case peak-to-peak ripple current occurs at 50% duty cycle 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.
Copyright 2008–2010, Texas Instruments Incorporated
27
Product Folder Link(s): TPS40210-Q1 TPS40211-Q1
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