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參數(shù)資料
| 型號： | PT3344N |
| 英文描述： | DC to DC Converter |
| 中文描述： | DC至DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 4/9頁 |
| 文件大?。?/td> | 194K |
| 代理商： | PT3344N |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Adjusting the Output Voltage of Power Trends’
30W Isolated DC/DC Converter Series
The factory pre-set output voltage of Power Trends’ 30W
series of isolated DC/DC converters may be adjusted
within a nominal ±10% range. This is accomplished with
the addition of a single external resistor. For the input
voltage range specified in the data sheet, Table 1 gives the
allowable adjustment range for each model as V
o
(min)
and V
o
(max).
Adjust Up:
An increase in the output voltage is obtained
by adding a resistor, R
2
between V
o
adjust (pin 18), and
-Remote Sense (pin 13).
See note 4
.
Adjust Down:
Add a resistor
(R
1
)
, between V
o
adjust (pin
18), and +Remote Sense (pin 19).
Refer to Figure 1 and Tables 2 & 3 for both the placement and
value of the required resistor,
(R
1
)
or R
2
.
Notes:
1. Use only a single 1% resistor in either the
(R
1
)
or R
2
location. Place the resistor as close to the ISR as possible.
2. Never connect capacitors to V
o
adjust. Any capacitance
added to the V
o
adjust control pin will affect the stability of
the ISR.
Table 1
DC/DC CONVERTER ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt #
AL Case:
24V Bus
48V Bus
CU Case:
24V Bus
PT4585
48V Bus
V
o
(nom)
1.8V
Vo(min)
1.62V
Vo(max)
2.5V
V
r
1.225V
K
o
(V·k
)
69.58
R
s
(k
)
80.6
PT3341
PT3321
PT3342
PT3322
PT3343
PT3323
PT3344
PT3324
PT3327
PT3325
PT3326
PT4581
PT4561
3.3V
2.95V
3.65V
1.225V
68.89
150.0
PT4582
PT4562
5.0V
4.5V
5.5V
1.225V
68.71
121.0
PT4583
PT4563
12.0V
10.8V
13.2V
2.5V
135.9
90.9
PT4584
PT4564
15.0V
13.5V
16.5V
2.5V
137.5
80.6
PT4567
1.8V
1.62V
1.98V
1.225V
69.58
80.6
PT4565
2.0V
1.8V
2.2V
1.225V
62.47
150.0
PT4566
2.5V
2.25V
2.75V
1.225V
42.33
121.0
PT4571
9.0V
7.0V
10.0V
2.5V
133.25
110
Figure 1
(R1)
Adj Down
R2
Adj
Up
Cin
100
μ
F
100V
(Optional)
+
Cout
330
μ
F
+
L
O
A
D
+V
out
-V
out
+V
in
-V
in
30W Isolated
18
4, 5, 6
7, 8, 9
+Vin
+Vout
-Vin
Vo(adj)
Remote
On/Off
2
Sns(+)
19
10 - 12
-Vout
14 - 17
Sns(-)
13
3. If the remote sense pins are not being used, the resistors
(R1)
and R2 can be connected to +V
out
or -V
out
respectively.
4. The adjusted output voltage, V
a
effectively sets the voltage
across pins 13 and 19 (±Remote Sense). When using the
remote sense pins, V
out
(measured directly across pins 10–
12, and 14–17) can be significantly higher than V
a
, and may
exceed V
o
(max). If V
a
is adjusted upward of V
o
(max), the
the minimum input voltage is increased by the same
percentage as V
out
exceeds V
o
(max).
The values of
(R
)
[adjust down], and R
[adjust up], can
also be calculated using the following formulas.
K
o
(V
a
– V
r
)
V
r
(V
o
– V
a
)
(R
1
)
=
– R
s
k
R
2
=
K
o
– R
s
k
(V
a
– V
o
)
Where
V
o
V
a
V
r
K
o
= Multiplier constant (Table 1)
R
s
= Series resistance (Table 1)
= Original output voltage
= Adjusted output voltage
= Reference voltage (Table 1)
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