Datasheet

Inhibit
GND GND
R
SET
0.05 W
1%
C
I
(Ceramic)
C
O
(Required)
PTN78000W
1
4
52
3
AdjGND
V
O
V
I
2.2 Fm
100 Fm
V
I
V
O
Inh
PTN78000W , PTN78000H
www.ti.com ...................................................................................................................................... SLTS230C – NOVEMBER 2004 – REVISED SEPTEMBER 2008
As an example, Table 2 gives the operating input voltage range for the common output bus voltages. In addition,
the Electrical Characteristics define the available output voltage adjust range for various input voltages.
Table 2. Standard Values of R
SET
for Common Output Voltages
R
SET
V
O
V
O
Operating
PRODUCT (Standard Value)
(Required) (V) (Actual) (V) V
I
Range (V)
(k Ω )
2.5 Open 2.5 7 to 25
3.3 78.7 3.306 7 to 33
PTN780x0W
5 21 4.996 7 to 36
12 0.732 12.002 14.5 to 36
12 383 12.000 15 to 36
15 15 14.994 18 to 36
PTN780x0H
18 4.42 18.023 21 to 36
22 0.0953 21.998 26 to 36
(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 1
using dedicated PCB traces.
(2) Never connect capacitors from V
O
Adjust to GND or V
O
. Any capacitance added to the V
O
Adjust pin affects the
stability of the regulator.
Figure 27. PTN78000W V
O
Adjust Resistor Placement
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