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TPS40055 Datasheet

  • TPS40055

  • 寬輸入 (8V-40V) 最高頻率 1MHz 的同步降壓控制器，具有輸出驅動...

  • 34頁

  • TI

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SLUS593B 鈭?DECEMBER 2003 鈭?REVISED APRIL 2004
TPS40054
TPS40055
TPS40057
APPLICATION INFORMATION
BP5 AND BP10 INTERNAL VOLTAGE REGULATORS
Start-up characteristics of the BP5 and BP10 regulators over different temperature ranges are shown in
Figures 6 and 7. 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
10
6
INPUT VOLTAGE
vs
BP10 VOLTAGE
5
110擄C
VBP10 鈭?BP10 Voltage 鈭?V
VBP5 鈭?BP5 Voltage 鈭?V
8
4
鈭?5擄C
6
110擄C
25擄C
3
25擄C
4
鈭?5擄C
2
2
1
2
4
6
8
VIN鈭?Input Voltage 鈭?V
10
12
0
2
4
6
8
VIN鈭?Input Voltage 鈭?V
10
12
Figure 6.
Figure 7.
SELECTING THE INDUCTOR VALUE
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鈥檛 enter discontinuous mode until
the load approximated somewhere between 10% and 30% of the rated output. The inductance value is
described in equation (4).
L
+
where:.
V
IN
*
V
O
V
IN
DI
V
O
f
SW
(Henries)
(4)
D
V
O
is the output voltage
D
鈭咺
is the peak-to-peak inductor current
12
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