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PTH04T240FAS bảng dữ liệu(PDF) 16 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED POWER MODULE FOR 3-GHz DSP SYSTEMS
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PTH04T240F Type B Capacitors
9
8
20
10
7
6
5
2
1
4
3
C - Capacitance - mF
5-V INPUT
C - Capacitance - mF
3.3-V INPUT
9
8
20
10
7
6
5
2
1
4
3
(
)
(
)
(
)
O
TT
O
40
1
C
5000
R
k
C
1000
1
é
ù
´
-
ë
û
=
W
é
ù
-
ë
û
(2)
PTH04T240F
SLTS293A – DECEMBER 2008 – REVISED MARCH 2009 ............................................................................................................................................... www.ti.com
Figure 10. Capacitor Type B, 1000 < C(
µF)×ESR(mΩ) ≤
Figure 11. Capacitor Type B, 1000 < C(
µF)×ESR(mΩ) ≤
5000 (e.g. Polymer-Tantalum)
5000 (e.g. Polymer-Tantalum)
Table 4. Type B TurboTrans CO Values and Required RTT Selection Table
TRANSIENT VOLTAGE DEVIATION (mV)
5-V INPUT
3.3-V INPUT
CO
RTT
CO
RTT
25% load step
50% load step
75% load step
Minimum
Required
Minimum
Required
(2.5 A)
(5 A)
(7.5 A)
Required Output
TurboTrans
Required Output
TurboTrans
Capacitance (
µF)
Resistor (k
Ω)
Capacitance (
µF)
Resistor (k
Ω)
25
50
75
1000
open
1000
open
22
44
66
1065
487
1120
261
20
40
60
1180
169
1230
130
18
36
54
1300
97.6
1360
80.6
15
30
45
1580
47.5
1640
42.2
12
24
36
2000
23.7
2060
22.1
10
20
30
2400
15.0
2470
13.7
8
16
24
3020
7.87
3090
7.32
5
10
5
4900
0.21
5000
short
RTT Resistor Selection
The TurboTrans resistor value, RTT can be determined from the TurboTrans programming, see Equation 2.
Where CO is the total output capacitance in µF. CO values greater than or equal to 5000 µF require RTT to be a
short, 0
Ω. (RTT results in a negative value when CO > 5000µF).
To ensure stability, a minimum amount of output capacitance is required for a given RTT resistor value. The value
of RTT must be calculated using the minimum required output capacitance determined from the capacitor
transient response charts above.
16
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Copyright © 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): PTH04T240F



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