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PTH04T231W bảng dữ liệu(PDF) 19 Page - Texas Instruments

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tên linh kiện PTH04T231W
Giải thích chi tiết về linh kiện  6-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans?
PDF  35 Pages
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PTH04T231W bảng dữ liệu(HTML) 19 Page - Texas Instruments

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40
30
20
4
10
With TurboTrans
Without TurboTrans
6
5
8
7
9
C − Capacitance −
µF
C − Capacitance −
µF
Without TurboTrans
With TurboTrans
40
30
20
4
10
6
5
8
7
9
R
TT + 40
1 * CO 1250
C
O
250 * 1
kW
(3)
PTH04T230W, PTH04T231W
SLTS271A – SEPTEMBER 2006 – REVISED OCTOBER 2006
PTH04T230W Type B Capacitors
5-V Input
3.3-V Input
Figure 12. Capacitor Type B, 1000 < C(
µF) x ESR(mΩ) ≤
Figure 13. Capacitor Type B, 1000 < C(
µF) x ESR(mΩ) ≤
5000
5000
(e.g. Polymer-Tantalum)
(e.g. Polymer-Tantalum)
Table 5. 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
(1.5 A)
(3 A)
(4.5 A)
Required Output
TurboTrans
Required Output
TurboTrans
Capacitance (
µF)
Resistor (k
Ω)
Capacitance (
µF)
Resistor (k
Ω)
60
120
180
250
open
250
open
50
100
150
300
165
300
165
40
80
120
400
46.4
400
46.4
30
60
90
570
16.9
570
16.9
25
50
75
710
9.31
720
9.09
20
40
60
940
3.57
960
3.24
15
30
45
1520
short
1500
short
12
24
36
3200
short
3100
short
RTT Resistor Selection
The TurboTrans resistor value, RTT can be determined from the TurboTrans programming equation:
Where CO is the total output capacitance in µF. CO values greater than or equal to 1250 µF require RTT to
be a short, 0
Ω.
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.
19
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