Datasheet

20
10
9
8
7
6
5
4
3
2
10000
6000
5000
4000
3000
2000
1000
500
400
300
200
C − Capacitance − µF
V
I
= 5 V
Transient − mV/A
With Turbo Trans
Without Turbo Trans
R
TT
Resistor Selection
R
TT
+ 40
1 *
ǒ
C
O
4000
Ǔ
5
ǒ
C
O
4000
Ǔ
* 1
kW
(2)
PTH05T210W
www.ti.com ...................................................................................................................................................... SLTS263I – AUGUST 2007 – REVISED MARCH 2009
Type A Capacitor
5-V Input
Figure 7. Capacitor Type A, 100 ≤ C µ F × ESR ≤ 1000 m Ω
(e.g. Ceramic)
Table 4. Type A TurboTrans C
O
Values & Required R
TT
Selection Table
Transient Voltage Deviation (mV) 5-V Input
25% 50% 75% C
O
R
TT
Load Step Load Step Load Step Minimum Required Output Required TurboTrans
(7.5 A) (15 A) (22.5 A) Capacitance Resistor (k Ω )
( µ F)
90 180 270 800 open
80 160 240 950 165
70 140 210 1100 75.0
60 120 180 1350 40.2
50 100 150 1650 22.1
40 80 120 2150 11.3
30 60 90 3000 3.65
25 40 60 3700 0.825
The TurboTrans resistor value, R
TT
can be determined from the TurboTrans programming equation, see
Equation 2 .
Where C
O
is the total output capacitance in µ F. C
O
values greater than or equal to 4000 µ F require R
TT
to be a
short, 0 Ω . (Equation 2 results in a negative value for R
TT
when C
O
≥ 4000 µ F.)
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