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| 型号： | TPS40054PWPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 3/35页 |
| 文件大小： | 866K |
| 代理商： | TPS40054PWPRG4 |
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BP5 AND BP10 INTERNAL VOLTAGE REGULATORS
2
4
6
8
12
10
V
IN
– Input Voltage – V
2
1
5
4
6
3
V
B
P
5
–
B
P
5
V
o
lt
a
g
e
–
V
110°C
– 55°C
25°C
2
4
6
8
12
10
V
IN
– Input Voltage – V
2
0
8
6
10
4
V
B
P
1
0
–
B
P
1
0
V
o
lt
a
g
e
–
V
110°C
– 55°C
25°C
1
7
5
9
3
SELECTING THE INDUCTOR VALUE
L +
V
IN * VO
V
O
V
IN
DI
f
SW
(Henries)
(5)
www.ti.com ...................................................................................................................................... SLUS593F – DECEMBER 2003 – REVISED SEPTEMBER 2008
Start-up characteristics of the BP5 and BP10 regulators over different temperature ranges are shown in Figure 7
and Figure 8. Slight variations in the BP5 occurs dependent upon the switching frequency. Variation in the BP10
regulation characteristics is also based on the load presented by switching the external MOSFETs.
INPUT VOLTAGE
vs
BP5 VOLTAGE
BP10 VOLTAGE
Figure 7.
Figure 8.
The inductor value determines the magnitude of ripple current in the output capacitors as well as the load current
at which the converter enters discontinuous mode. Too large an inductance results in lower ripple current but is
physically larger for the same load current. Too small an inductance results in larger ripple currents and a greater
number of (or more expensive output capacitors for) the same output ripple voltage requirement. A good
compromise is to select the inductance value such that the converter doesn't enter discontinuous mode until the
load approximated somewhere between 10% and 30% of the rated output. The inductance value is described in
where
V
O is the output voltage
ΔI is the peak-to-peak inductor current
Copyright 2003–2008, Texas Instruments Incorporated
11
Product Folder Link(s): TPS40054 TPS40055 TPS40057
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