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PTH08T231W Datasheet(PDF) 18 Page - Texas Instruments

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Part # PTH08T231W
Description  6-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans?
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PTH08T231W Datasheet(HTML) 18 Page - Texas Instruments

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C − Capacitance −
µF
20
10
9
8
7
30
40
PTH08T231 Type A
Ceramic Capacitors
Without TurboTrans
With TurboTrans
C − Capacitance −
µF
20
10
9
8
7
30
40
PTH08T231 Type A
Ceramic Capacitors
Without TurboTrans
With TurboTrans
R
TT
=40x
1-(C
/1000)
O
5 x(C
/1000)-1
O
(k
)
W
[]
(2)
PTH08T230W, PTH08T231W
SLTS265F – NOVEMBER 2005 – REVISED MAY 2007
PTH08T231W Type A Capacitors
12-V INPUT
5-V INPUT
Figure 12. Capacitor Type A, 100
≤ C(
µF) x ESR(mΩ) ≤
Figure 13. Capacitor Type A, 100
≤ C(
µF) x ESR(mΩ) ≤
1000
1000
(e.g. Ceramic)
(e.g. Ceramic)
Table 4. Type A TurboTrans CO Values and Required RTT Selection Table
Transient Voltage Deviation (mV)
12 V Input
5 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)
45
90
135
200
open
200
open
40
80
120
240
150
210
634
35
70
105
300
56.2
260
97.6
30
60
90
400
23.7
340
37.4
25
50
75
560
9.76
460
16.5
20
40
60
840
2.0
660
5.9
15
30
45
N/A
N/A
1450
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 1000 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.
18
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Copyright © 2005–2007, Texas Instruments Incorporated
Product Folder Link(s): PTH08T230W PTH08T231W


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