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參數(shù)資料
| 型號(hào)： | PT4711N |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 45-W Dual-Output Isolated DC/DC Converter |
| 中文描述： | 45瓦雙輸出隔離式DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大?。?/td> | 336K |
| 代理商： | PT4711N |
Application Notes
For technical support and further information, visit http://power.ti.com
Adjusting the Output Voltages of the PT4711
Dual-Output DC/DC Converters
The PT4711 dual-output DC/DC converter produces
two independently regulated output voltages. The mag-
nitude of each output may be trimmed higher or lower
than the nominal set-point by up to 10%. The adjust-
ment method uses a single external resistor.
1
The value
of the resistor determines the magnitude of adjustment,
and the location of the resistor determines the direction
of adjustment (increase or decrease). The resistor values
can be calculated using a formula (see below). Alterna-
tively the resistor value may be selected directly from
the values given in Table 2-2. The placement of each
resistor is as follows.
Adjust Up:
To increase the magnitude of the output volt-
age, add a resistor R
1
between the appropriate
Vo
x
Adj
(‘Vo
1
Adj’ or ‘Vo
2
Adj’) and the respective
-Vo
x
voltage
rail. See Figure 2-1(a) and Table 2-1 for the resistor
placement and pin connections.
Figure 2-1b
PT4711
Calculation of Resistor Adjust Values
The adjust resistor value may also be calculated using an
equation. Note that the equation for R
1
[Adjust Up] is
different to that for
(R
2
)
[Adjust Down].
R
1
[Adjust Up]
=
35.75
(V
a
– V
o
)
– 20
k
(R
2
)
[Adjust Down]
=
14.3 (V
a
– 2.5) – 20
(V
o
– V
a
)
k
Where: V
o
= Original output voltage (Vo
x
)
V
a
= Adjusted output voltage (Va
x
)
(R
2
)
To adjust the Vo
1
or Vo
2
lower
# - See Table 3-1 for pin connections,
where Vo
x
indicates Vo
1
, or Vo
2
+Vo
x
Vo
x
Adj
+Vo
x
DC/DC
Module
#
#
#
–Vo
x
–Vo
x
Figure 2-1a
R
1
To adjust the Vo
1
or Vo
2
higher
# - See Table 3-1 for pin connections,
where Vo
x
indicates Vo
1
, or Vo
2
+Vo
x
Vo
x
Adj
+Vo
x
DC/DC
Module
#
#
#
–Vo
x
–Vo
x
Adjust Down:
To decrease the magnitude of the output
voltage, add a resistor
(R
2
)
, between the appropriate
Vo
x
Adj
(Vo
1
Adj or Vo
2
Adj,) and the respective
+Vo
x
voltage
rail. See Figure 2-1(b) and Table 2-1 for the resistor
placement and pin connections.
Table 2-1; Adjust Resistor Pin Connections
To Adjust Up
Connect R
1
from
Vo
x
Adj
To Adjust Down
Connect
(R
2
)
from
Vo
x
Adj
to
to
–Vo
x
+Vo
x
Vo
1
Vo
2
17
21
16
20
17
21
14
18
Notes:
1. Use only a single 1% (or better) tolerance resistor in
either the R
1
or
(R
2
)
location to adjust a specific output.
Place the resistor as close to the ISR as possible.
2. Never connect capacitors to any of the ‘Vo
x
Adj’ pins. Any
capacitance added to these control pins will affect the
stability of the respective regulated output.
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