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: 11/38页
文件大小: 1206K
代理商: PTH08T261WAZT
C Capacitance
F
T
ransient
mV/A
20
10
9
8
7
30
4000
3000
2000
1000
500
400
300
200
5000
900
600
700 800
100
40
PTH08T261 Type A
Ceramic Capacitors
Without TurboTrans
With TurboTrans
C Capacitance
F
T
ransient
mV/A
20
10
9
8
7
30
4000
3000
2000
1000
500
400
300
200
5000
900
600
700 800
100
40
PTH08T261 Type A
Ceramic Capacitors
Without TurboTrans
With TurboTrans
R
TT
=40x
1-(C
/1000)
O
5 x(C
/1000)-1
O
(k
)
W
[]
SLTS272F
– DECEMBER 2006 – REVISED APRIL 2011
PTH08T261W Type A Capacitors
12-V INPUT
5-V INPUT
Figure 10. Capacitor Type A, 100
≤ C(μF) x
Figure 11. Capacitor Type A, 100
≤ C(μF) x
ESR(m
) ≤ 1000
ESR(m
) ≤ 1000
(e.g. Ceramic)
Table 4. Type A 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
)
25
50
75
200
open
200
open
20
40
60
240
150
210
634
18
35
55
300
56.2
260
97.6
15
30
45
400
23.7
340
37.4
13
25
40
560
9.76
460
16.5
10
20
30
840
2.0
660
5.9
8
15
25
5000
N/A
950
0.536
RTT Resistor Selection
The TurboTrans resistor value, RTT can be determined from the TurboTrans programming equation:
(2)
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.
Copyright
2006–2011, Texas Instruments Incorporated
19
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