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參數(shù)資料
| 型號： | TPS2421-2DDA |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | PLATSIC, SOP-8 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 1297K |
| 代理商： | TPS2421-2DDA |
(
)
IFLT
FAULT
200k
200,000
R
80 k
I
2.5
W
=
=
W
3
6
FAULT
CT
3
T
10
C
20
0.514
10
38.9
10
38.9
10
-
=
=
15V
D1
SMAJ15A
1
2
3
4
8
7
6
5
FLT
EN
VIN
GND
PG
VOUT
CT
ISET
9
PwPd
TPS2421
R2
10kW
C1
0.1 mF
RISET
80.6kW
CT
560nF
D2
MBR130LSFT1
GND
12VIN
GND
12VOUT
R1
10kW
1
SLUS907D – JANUARY 2009 – REVISED AUGUST 2010
www.ti.com
Design Example
This TPS2421 Design supports 12 V to operate a hot plugged disk drive.
The 12 V specification for a disk drive is approximately 1-A operating current and 2-A typical spin-up. Selecting a
2.5 A setting for ISET would allow some margin for the operating current and satisfy the start current
requirements.
(8)
Because ISET satisfies the spin up current, the timer can be set for the additional loading of charging the
capacitor. Estimate approximately 20 ms. Use either Equation 9 or Table 3 to estimate the capacitance.
(9)
To alter parameters IIAX, IFAULT, IIMON or CCT use the formulas in the Pin Description section or use Table 3 .
Figure 21. 12-V, 2.5-A Steady State Current, 3.125-A Max Currrent
NOTE
D1, D2, and C1 are required only in systems with significant feed and/or load inductance.
Table 3. Typical Design Examples
ISET (A)
RISET (k)
CCT (mF)
TFAULT (ms)
TSD (ms)
ILOAD(max) (A)
1
200
0.022
0.86
22
1
1.5
133
0.047
1.83
47
1.5
2
100
0.1
3.89
100
2
2.5
80.6
0.22
8.56
220
2.5
3
65.5
0.47
18.28
470
3
3.5
56.2
0.68
26.45
680
3.5
4
49.9
1
38.9
1000
4
16
Copyright 2009–2010, Texas Instruments Incorporated
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