Datasheet

GND GND
R
SET
0.01W
1%
PTN04050C
1
3
42
AdjGND
V
O
V
I
V
I
V
O
C
O
100 F
(Required)
m
C
10
I
0 F
(Required)
m
R =15k
SET
W ´
2V
V -5V
O
-2.94kW
PTN04050C
www.ti.com SLTS251A –SEPTEMBER 2005–REVISED FEBRUARY 2011
APPLICATION INFORMATION
Adjusting the Output Voltage of the PTN04050C Wide-Output Adjust Power Modules
General
A resistor must be connected between the V
O
Adjust control (pin 3) and GND (pin 1) to set the output voltage of
the PTN04050C product. The adjustment range is from 5 V to 15 V. If pin 3 is left open, the output voltage
defaults to the lowest value.
Table 1 gives the standard resistor value for several common voltages, along with the actual output voltage that
the value provides. For other output voltages, the value of the required resistor can be calculated using
Equation 1. Alternatively, R
SET
can be simply selected from the range of values given in Table 2. Figure 14
shows the placement of the required resistor.
(1)
Table 1. Standard Values of R
SET
for Common Output
Voltages
V
O
R
SET
V
O
(Required) (Standard Value) (Actual)
5.0 V Open 5.00 V
9.0 V 4.53 kΩ 9.01 V
12.0 V 1.33 kΩ 12.03 V
15.0 V 60.4 Ω 14.99 V
(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 3 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 14. PTN04050C V
O
Adjust Resistor Placement
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