參數(shù)資料
型號: PTH08T231WAZT
廠商: TEXAS INSTRUMENTS INC
元件分類: 電源模塊
英文描述: 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
封裝: ROHS COMPLIANT PACKAGE-10
文件頁數(shù): 11/39頁
文件大?。?/td> 1281K
代理商: PTH08T231WAZT
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
PTH08T231 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
PTH08T231 Type A
Ceramic Capacitors
Without TurboTrans
With TurboTrans
R
TT
=40x
1-(C
/1000)
O
5 x(C
/1000)-1
O
(k
)
W
[]
www.ti.com
SLTS265K – NOVEMBER 2005 – REVISED JUNE 2010
PTH08T231W Type A Capacitors
12-V INPUT
5-V INPUT
Figure 12. Capacitor Type A, 100
≤ C(mF) x
Figure 13. Capacitor Type A, 100
≤ C(mF) 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
(1.5 A)
(3 A)
(4.5 A)
Required Output
TurboTrans
Required Output
TurboTrans
Capacitance (mF)
Resistor (k
)
Capacitance (mF)
Resistor (k
)
45
90
135
200
open
200
open
40
80
120
240
150
210
634
35
70
105
300
56.2
260
97.6
30
60
90
400
23.7
340
37.4
25
50
75
560
9.76
460
16.5
20
40
60
840
2.0
660
5.9
15
30
45
N/A
1450
short
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 mF. CO values greater than or equal to 1000 mF 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 2005–2010, Texas Instruments Incorporated
19
Product Folder Link(s): PTH08T230W PTH08T231W
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