参数资料
型号: PTH08T261WAZT
厂商: TEXAS INSTRUMENTS INC
元件分类: 电源模块
英文描述: 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
封装: ROHS COMPLIAT PACKAGE-10
文件页数: 13/38页
文件大小: 1206K
代理商: PTH08T261WAZT
C Capacitance
F
T
ransient
mV/A
20
10
9
8
7
30
40
Without TurboTrans
With TurboTrans
1000
500
400
300
200
600 700
100
5000
4000
3000
2000
10000
6000
C Capacitance
F
T
ransient
mV/A
1000
500
400
300
200
600 700
100
5000
4000
3000
2000
10000
6000
20
10
9
8
7
30
40
R
TT
=40x
1-(C
/1000)
O
5 x(C
/1000)-1
O
(k
)
W
[]
SLTS272F
– DECEMBER 2006 – REVISED APRIL 2011
PTH08T260W Type B Capacitors
12-V INPUT
5-V INPUT
Figure 12. Capacitor Type B, 1000
< C(μF) x
Figure 13. Capacitor Type B, 1000
< C(μF) x
ESR(m
) ≤ 5000
ESR(m
) ≤ 5000
(e.g. Polymer-Tantalum)
Table 5. Type B 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
(0.75 A)
(1.5 A)
(2.25 A)
Required Output
TurboTrans
Required Output
TurboTrans
Capacitance (
μF)
Resistor (k
)
Capacitance (
μF)
Resistor (k
)
30
55
85
200
open
200
open
25
50
75
210
634
230
205
20
40
60
300
56.2
320
45.3
18
35
55
370
29.4
400
23.7
15
30
45
460
16.5
500
13.3
13
25
40
610
7.68
650
6.19
10
20
30
850
1.87
900
1.15
8
15
25
2700
short
5000
short
RTT Resistor Selection
The TurboTrans resistor value, RTT can be determined from the TurboTrans programming equation:
(3)
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
.
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
Copyright
2006–2011, Texas Instruments Incorporated
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