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参数资料
| 型号： | PTN04050CAST |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 12 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | DIP-4 |
| 文件页数： | 5/19页 |
| 文件大小： | 640K |
| 代理商： | PTN04050CAST |
GND
GND
1
3
4
2
GND
Adj
C5
VI
VO
PTN04050C
VI
VO
RSET
L1
1-5 H
m
L2
1-5 H
m
C1
22 F
Ceramic
m
C4
22 F
Ceramic
m
C2
10
*
0 F
(Required)
m
C3
*
100 F
(Required)
m
* Seethe
sectionforsuggestedvalueandtype.
ApplicationInformation
Recommendedforapplicationswithloadtransients.
10
15
20
25
30
35
40
45
0
0.5
1
1.5
2
2.5
3
1 MHz
600 kHz
Attenuation
dB
Load Current A
SLTS251A
– SEPTEMBER 2005 – REVISED FEBRUARY 2011
π Filters
If a further reduction in ripple/noise level is required for an application, higher order filters must be used. A
π (pi)
filter, employing a ferrite bead (Fair-Rite Part Number 2673000701 or equivalent) in series with the input or
output terminals of the regulator reduces the ripple/noise by at least 20 db (see Figure 18 and Figure 19). In
order for the inductor to be effective in reduction of ripple and noise, ceramic capacitors are required. (Note: for
additional information on vendors and component suggestions, see the capacitor recommendations for the
PTN04050C.)
These inductors plus ceramic capacitors form an excellent filter because of the rejection at the switching
frequency (650 kHz - 1 MHz). The placement of this filter is critical. It must be located as close as possible to the
input or output pins to be effective. The ferrite bead is small (12,5 mm X 3 mm) and has low dc resistance.
Fair-Rite also manufactures a surface-mount bead (Part No. 2773021447), through hole (Part Number
2673000701) rated to 5 A. Inductors in the range of 1
μH to 5 μH can be used in place of the ferrite inductor
bead.
Figure 18. Adding
π Filters
Figure 19.
π-Filter Attenuation vs. Load Current
2005–2011, Texas Instruments Incorporated
13
Product Folder Link(s): PTN04050C
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