Datasheet

C5
1 µF
Ceramic
UDG−06050
C1
2.2 µF
50 V
Ceramic
C2
330 µF
50 V
(Optional)
R
SET
C6
100 µF
V
I
V
I
PTN78020W
2 6
5
+
7 4
Vo
Inhibit GND Adjust
Vo
Sense
13
GNDGND
+
GND
C3
2.2 µF
50 V
Ceramic
(Required)
C4
330 µF
(Required)
(2)
(3)(4)
L1
1−5 µH
(1)
L2
1−5 µH
+
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
PTN78020W
PTN78020H
SLTS228C – DECEMBER 2004– REVISED AUGUST 2011 www.ti.com
(1) See the specifications for required value and type. For the PTN78020H, C3 = 4 × 4.7 μF.
(2) See the Application Information section for suggeted value and type.
(3) Recommended whenever I
O
> 2A.
(4) For PTN78020H, C1 ≤ 4.7 μF.
Figure 30. Adding π Filters (I
O
≤ 3 A)
Figure 31. π-Filter Attenuation vs. Load Current
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Product Folder Link(s): PTN78020W PTN78020H