PTH08T220W Datasheet, PDF (19/37 Pages) Texas Instruments – 16-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans

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PTH08T220W Type B Capacitors
20
V_I = 12 V
12-V INPUT
With TurboTrans
Without TurboTrans
PTH08T220W, PTH08T221W
SLTS252E – NOVEMBER 2005 – REVISED OCTOBER 2006
20
V_I = 5 V
5-V INPUT
With TurboTrans
Without TurboTrans
10
10
9
9
8
8
7
7
6
6
5
5
4
4
3
3
2
2
C − Capacitance − µF
Figure 14. Capacitor Type B,
1000 < C(µF)×ESR(mΩ) ≤ 5000 (e.g. Polymer-Tantalum)
C − Capacitance − µF
Figure 15. Capacitor Type B,
1000 < C(µF)×ESR(mΩ) ≤ 5000 (e.g. Polymer-Tantalum)
Table 5. Type B TurboTrans C_O Values and Required R_TT Selection Table
Transient Voltage Deviation (mV)
12 Volt Input
5 Volt Input
25% load step
(4 A)
50% load step
(8 A)
75% load step
(12 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)
65
125
190
220
open
220
open
50
100
150
270
132
270
132
40
80
120
330
56
330
56
30
60
90
470
20.5
500
17.4
25
50
75
600
10.5
650
8.25
20
40
60
800
4.12
900
2.32
15
30
45
1500
short
1700
short
10
20
30
7000
short
10000
short
R_TT Resistor Selection
The TurboTrans resistor value, R_TT can be determined from the TurboTrans programming Equation 3.
R_TT + 40
ƪ_{1 *} ǒ_COń1100Ǔƫ
ƪǒ_{5 COń1100}Ǔ _{* 1}ƫ
(kW)
(3)
Where C_O is the total output capacitance in µF. C_O values greater than or equal to 1100 µF require R_TT to be a
short, 0Ω. (Equation 3 results in a negative value for R_TT when C_O > 1100 µF.)
To ensure stability, a minimum amount of output capacitance is required for a given R_TT resistor value. The
value of R_TT must be calculated using the minimum required output capacitance determined from Figure 14 and
Figure 15.
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