PTH08T240F_08 Datasheet, PDF (18/37 Pages) Texas Instruments – 10-A, 4.5-V to 14-V INPUT, NON-ISOLATED POWER MODULE FOR 3-GHz DSP SYSTEMS

PTH08T240F
SLTS277C – DECEMBER 2006 – REVISED DECEMBER 2008........................................................................................................................................ www.ti.com
PTH08T240F Type C Capacitors
8-V Input
10
9
8
7
6
5
4
5-V Input
10
9
8
7
6
5
4
3
3
2
2
1
1
C - Capacitance - mF
Figure 18. Capacitor Type C,
5000 < C(µF)×ESR(mΩ) ≤ 10,000
(e.g. OS-CON)
C - Capacitance - mF
Figure 19. Capacitor Type C,
5000 < C(µF)×ESR(mΩ) ≤ 10,000
(e.g. OS-CON)
Table 6. Type C TurboTrans C_O Values and Required R_TT Selection Table
Transient Voltage Deviation (mV)
8-V Input
5-V Input
25% load step
(2.5 A)
50% load step
(5 A)
75% load step
(7.5 A)
C_O
Minimum
Required Output
Capacitance (µF)
R_TT
Required
TurboTrans
Resistor (kΩ)
C_O
Minimum
Required Output
Capacitance (µF)
R_TT
Required
TurboTrans
Resistor (kΩ)
20
40
60
1000
open
1040
787
18
36
54
1000
open
1180
169
16
32
48
1100
340
1350
82.5
14
28
42
1300
97.6
1600
45.3
12
24
36
1600
45.3
1930
26.7
10
20
30
2050
22.6
2420
14.7
8
16
24
2750
10.5
3200
6.49
6
12
18
4050
2.49
4560
1.0
R_TT Resistor Selection
The TurboTrans resistor value, R_TT can be determined from the TurboTrans programming, see Equation 4 .
R_TT
=
40 ´ éë1- (C_O 5000)ùû
éë₍C_O 1000₎- 1ùû
(kW)
(4)
Where C_O is the total output capacitance in µF. C_O values greater than or equal to 5000 µF require R_TT to be a
short, 0 Ω. (R_TT results in a negative value when C_O > 5000 µF).
To ensure stability, the value of R_TT must be calculated using the minimum required output capacitance
determined from the capacitor transient response charts above.
18
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