Datasheet

GND
GND
R
SET
0.05 W
1%
C
O
330 Fm
PTN78020H
7 4
5
62
3
V
I
V
I
V
O
V
O
GND
Inhibit
1
Sense
Adjust
C
4x4.7 F
Ceramic
I
m
GND
PTN78020W
PTN78020H
SLTS228C – DECEMBER 2004– REVISED AUGUST 2011 www.ti.com
(1) A 0.05-W rated resistor may be used. The tolerance should be 1%, with a temperature stability of 100 ppm/°C (or
better). Place the resistor as close to the regulator as possible. Connect the resistor directly between pins 4 and 7
using dedicated PCB traces.
(2) Never connect capacitors from V
O
Adjust to either GND or V
O
. Any capacitance added to the V
O
Adjust
pin affects the stability of the regulator.
Figure 25. PTN78020H V
O
Adjust Resistor Placement
Table 4. PTN78020H Output Voltage Set-Point Resistor Values
V
O
R
SET
V
O
R
SET
V
O
R
SET
11.85 V 2633 kΩ 13.50 V 34.3 kΩ 17.20 V 6.12 kΩ
11.90 V 896 kΩ 13.65 V 30.9 kΩ 17.40 V 5.66 kΩ
11.95 V 538 kΩ 13.80 V 28.1 kΩ 17.60 V 5.23 kΩ
12.00 V 383 kΩ 13.95 V 25.6 kΩ 17.80 V 4.83 kΩ
12.10 V 242 kΩ 14.10 V 23.5 kΩ 18.00 V 4.46 kΩ
12.15 V 204 kΩ 14.25 V 21.6 kΩ 18.20 V 4.11 kΩ
12.20 V 176 kΩ 14.40 V 19.9 kΩ 18.40 V 3.79 kΩ
12.25 V 154 kΩ 14.55 V 18.5 kΩ 18.60 V 3.48 kΩ
12.30 V 138 kΩ 14.70 V 17.2 kΩ 18.80 V 3.19 kΩ
12.35 V 124 kΩ 14.85 V 16.0 kΩ 19.00 V 2.91 kΩ
12.40 V 113 kΩ 15.00 V 14.9 kΩ 19.20 V 2.65 kΩ
12.45 V 103 kΩ 15.15 V 13.9 kΩ 19.40 V 2.41 kΩ
12.50 V 94.9 kΩ 15.30 V 13.1 kΩ 19.60 V 2.18 kΩ
12.55 V 87.9 kΩ 15.45 V 12.3 kΩ 19.80 V 1.95 kΩ
12.60 V 81.8 kΩ 15.60 V 11.5 kΩ 20.00 V 1.74 kΩ
12.65 V 76.4 kΩ 15.75 V 10.8 kΩ 20.20 V 1.54 kΩ
12.70 V 71.7 kΩ 15.90 V 10.2 kΩ 20.40 V 1.35 kΩ
12.75 V 67.5 kΩ 16.05 V 9.59 kΩ 20.60 V 1.17 kΩ
12.80 V 63.7 kΩ 16.20 V 9.03 kΩ 20.80 V 995 Ω
12.85 V 60.2 kΩ 16.35 V 8.51 kΩ 21.00 V 829 kΩ
12.90 V 57.1 kΩ 16.50 V 8.03 kΩ 21.20 V 669 Ω
12.95 V 54.3 kΩ 16.65 V 7.57 kΩ 21.40 V 516 Ω
13.00 V 51.7 kΩ 16.80 V 7.14 kΩ 21.80 V 229 Ω
13.05 V 49.3 kΩ 17.10 V 6.36 kΩ 22.00 V 94 Ω
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