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參數(shù)資料
| 型號： | TPS40054QPWPRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 4/28頁 |
| 文件大小： | 571K |
| 代理商： | TPS40054QPWPRQ1 |
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2
8
4
6
12
10
0
2
4
6
8
10
INPUT VOLTAGE
vs
BP10 VOLTAGE
VIN Input Voltage V
V
B
P
1
0
BP10
V
oltage
V
55
°C
110
°C
25
°C
2
8
4
6
12
10
1
2
3
4
5
6
INPUT VOLTAGE
vs
BP5 VOLTAGE
25
°C
110
°C
55
°C
VIN Input Voltage V
V
B
P
5
BP5
V
oltage
V
SELECTING THE INDUCTOR VALUE
L +
V
IN * VO
V
O
V
IN
DI
f
SW
(Henries)
(4)
CALCULATING THE OUTPUT CAPACITANCE
DV + DI ESR )
1
8
C
O
f
SW
V
P*P
(5)
TPS40054-Q1, TPS40055-Q1, TPS40057-Q1
SLAS482A – AUGUST 2005 – REVISED NOVEMBER 2005
APPLICATION INFORMATION (continued)
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 does not enter discontinuous mode until the
load approximated somewhere between 10% and 30% of the rated output. The inductance value is described in
Equation 4.
where:
VO is the output voltage
I is the peak-to-peak inductor current
The output capacitance depends on the output ripple voltage requirement, output ripple current, as well as any
output voltage deviation requirement during a load transient.
The output ripple voltage is a function of both the output capacitance and capacitor ESR. The worst case output
ripple is described in Equation 5.
The output ripple voltage is typically between 90% and 95% due to the ESR component.
12
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