參數(shù)資料
型號(hào)： PTN78060WAZT
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源模塊
英文描述： 1-OUTPUT 45 W DC-DC REG PWR SUPPLY MODULE
封裝： ROHS COMPLIANT, DIP-7
文件頁數(shù)： 13/28頁
文件大?。?/td> 1948K
代理商： PTN78060WAZT
www.ti.com
π Filters
GND
C5
7
4
5
6
2
3
GND
Inhibit
1
Sense
Adjust
VI
VO
C1
1 F
m
50 V
Ceramic
C2*
2.2 mF
50 V
Ceramic
(Required)
L1
1 - 5 mH
L2
1 - 5 mH
VI
VO
PTN78060W
RSET
C3
#
100 mF
(Optional)
C4
1 mF
Ceramic
Recommended whenever I is greater than 2 A.
O
# See
section for suggested value and type.
Application Information
* See specifications for required value and type. For PTN78060H, C2 is equal to 3 x 4.7 F.
m
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
PTN78060W, PTN78060H
SLTS229A – NOVEMBER 2004 – REVISED APRIL 2005
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 33 and Figure 34). In order for
the inductor to be effective ceramic capacitors are also required. (Note: see Capacitor Recommendations for
additional information on vendors and component suggestions.)
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
× 3 mm), easy to use, low cost, and has
low dc resistance. Fair-Rite also manufactures a surface-mount bead (part number 2773021447). It is rated to 5
A, and can be used on the output bus. As an alternative, suitably rated 1-H to 5-H wound inductors can be
used in place of the ferrite inductor bead.
Figure 33. Adding
π Filters (I
O ≤ 3 A)
Figure 34.
π-Filter Attenuation vs. Load Current
20
相關(guān)PDF資料
PDF描述
PTN78060HAST 1-OUTPUT 45 W DC-DC REG PWR SUPPLY MODULE
PTN78060HAH 1-OUTPUT 45 W DC-DC REG PWR SUPPLY MODULE
PTN78060WAZ 1-OUTPUT 45 W DC-DC REG PWR SUPPLY MODULE
PTN78060HAZT 1-OUTPUT 45 W DC-DC REG PWR SUPPLY MODULE
PTN78060WAD 1-OUTPUT 45 W DC-DC REG PWR SUPPLY MODULE
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