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參數(shù)資料
| 型號(hào)： | PT3344C |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | SMD-19 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 220K |
| 代理商： | PT3344C |
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 Vo (min)
and Vo (max).
Adjust Up:
An increase in the output voltage is obtained
by adding a resistor, R2 between Vo adjust (pin 18), and
-Remote Sense (pin 13). See note 4.
Adjust Down:
Add a resistor (R1), between Vo 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, (R1) or R2.
Notes:
1. Use only a single 1% resistor in either the (R1) or R2
location. Place the resistor as close to the ISR as possible.
2. Never connect capacitors to Vo adjust. Any capacitance
added to the Vo 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
PT3341
PT3342
PT3343
PT3344
48V Bus
PT3327
PT3325
PT3326
PT3321
PT3322
PT3323
PT3324
CU Case:
24V Bus
PT4585
PT4581
PT4582
PT4583
PT4584
48V Bus
PT4567
PT4565
PT4566
PT4561
PT4562
PT4571
PT4563
PT4564
Vo(nom)
1.8V
2.0V
2.5V
3.3V
5.0V
9.0V
12.0V
15.0V
Vo(min)
1.62V
1.8V
2.25V
2.95V
4.5V
7.0V
10.8V
13.5V
Vo(max)
2.5V
1.98V
2.2V
2.75V
3.65V
5.5V
10.0V
13.2V
16.5V
Vr
1.225V
2.5V
Ko (Vk
)
69.58
62.47
42.33
68.89
68.71
133.25
135.9
137.5
Rs (k
)
80.6
150.0
121.0
150.0
121.0
110
90.9
80.6
Figure 1
(R1)
Adj Down
R2
Adj
Up
Cin
100
F
100V
(Optional)
+
Cout
330
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 +Vout or -Vout
respectively.
4. The adjusted output voltage, Va effectively sets the voltage
across pins 13 and 19 (±Remote Sense). When using the
remote sense pins, Vout (measured directly across pins 10–
12, and 14–17) can be significantly higher than Va, and may
exceed Vo (max). If Va is adjusted upward of Vo(max), the
the minimum input voltage is increased by the same
percentage as Vout exceeds Vo(max).
The values of (R
1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulas.
(R1)
=
Ko (Va – Vr)
– Rs
k
Vr (Vo – Va)
R2
=
Ko
– Rs
k
(Va – Vo)
Where
Vo = Original output voltage
Va = Adjusted output voltage
Vr = Reference voltage (Table 1)
Ko = Multiplier constant (Table 1)
Rs = Series resistance (Table 1)
PT3320/3340/4560/4580 Series
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