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PTH08T261WAST Datasheet(PDF) 20 Page - Texas Instruments

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Part # PTH08T261WAST
Description  3-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans
PDF  36 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PTH08T261WAST Datasheet(HTML) 20 Page - Texas Instruments

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C − Capacitance −
µF
20
10
9
8
7
30
40
Without TurboTrans
With TurboTrans
C − Capacitance −
µF
20
10
9
8
7
30
40
R
TT
=40x
1-(C
/1000)
O
5 x(C
/1000)-1
O
(k
)
W
[]
(4)
PTH08T260W, PTH08T261W
SLTS272A – DECEMBER 2006 – REVISED MAY 2007
PTH08T260W Type C Capacitors
12-V INPUT
5-V INPUT
Figure 14. Capacitor Type C, 5000 < C(
µF) x ESR(mΩ) ≤
Figure 15. Capacitor Type C, 5000 < C(
µF) x ESR(mΩ) ≤
10,000
10,000
(e.g. OS-CON)
(e.g. OS-CON)
Table 6. Type C 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)
30
55
85
200
open
200
open
25
50
75
200
open
220
309
20
40
60
240
150
270
82.5
18
35
55
290
63.4
330
41.2
15
30
45
440
18.7
520
12.1
13
25
40
580
8.87
690
5.11
10
20
30
820
2.32
980
0.205
8
15
25
2300
short
6800
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.
20
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