Datasheet

20
10
9
8
7
6
5
4
3
2
10000
6000
5000
4000
3000
2000
1000
500
400
300
200
Transient − mV/A
C − Capacitance − µF
With Turbo Trans
Without Turbo Trans
R
TT
Resistor Selection
R
TT
+ 40
1 *
ǒ
C
O
2350
Ǔ
5
ǒ
C
O
2350
Ǔ
* 1
kW
(3)
PTH05T210W
SLTS263I – AUGUST 2007 – REVISED MARCH 2009 ...................................................................................................................................................... www.ti.com
Type B Capacitor
5-V Input
Figure 8. Capacitor Type B, 1000 ≤ C ( µ F) × ESR (m Ω ) ≤ 5000
(e.g. Polymer-Tantalum)
Table 5. Type B 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)
70 140 210 470 open
60 120 180 560 174
50 100 150 700 57.6
40 80 120 950 24.9
35 70 105 1100 15.8
30 60 90 1350 9.31
25 50 75 1700 4.42
20 40 60 2250 0.523
The TurboTrans resistor value, R
TT
can be determined from the TurboTrans programming equation, see
Equation 3 .
C
O
values greater than or equal to 2350 µ F require R
TT
to be a short, 0 Ω . (Equation 3 result sin a negative value
for R
TT
when C
O
≥ 2350 µ F.)
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