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PTH08T255WAST Datasheet(PDF) 14 Page - Texas Instruments

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Part # PTH08T255WAST
Description  40-A, 8-V to 14-V INPUT, 3-V to 5.25-V OUTPUT, NON-ISOLATED, ADJUSTABLE POWER MODULE
PDF  35 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

PTH08T255WAST Datasheet(HTML) 14 Page - Texas Instruments

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PTH08T255W Type B Capacitors
C – Capacitance – mF
2
1
4
3
With TurboTrans
With TurboTrans
Without TurboTrans
Without TurboTrans
6
5
7
(
)
(
)
O
TT
O
1
C
4700
R
40
(k
)
5
C
4700
1
-
=
´
W
´
-
(2)
PTH08T255W
SLTS290 – NOVEMBER 2008 ........................................................................................................................................................................................... www.ti.com
12-V INPUT
Figure 7. Capacitor Type B,
1000 < C(
µF)×ESR(mΩ) ≤ 5000 (e.g. Polymer-Tantalum)
Table 4. Type B TurboTrans CO Values and Required RTT Selection Table
Transient Voltage Deviation (mV)
12 Volt Input
25% load step
50% load step
75% load step
CO
RTT
(10 A)
(20 A)
(30 A)
Minimum Required
Required TurboTrans
Output
Resistor (k
Ω)
Capacitance (
µF)
65
130
195
1000
open
60
120
180
1100
187
50
100
150
1360
64.9
40
80
120
1760
28.7
30
60
90
2470
11.8
25
50
75
3050
6.19
20
40
60
4000
1.96
15
30
45
8000
short
RTT Resistor Selection
The TurboTrans resistor value, RTT can be determined from the TurboTrans programming Equation 2.
Where CO is the total output capacitance in µF. CO values greater than or equal to 4700 µF require RTT to be a
short, 0
Ω. (Equation 2 results in a negative value for RTT when CO > 4700 µF.)
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 Figure 7.
14
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): PTH08T255W



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