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参数资料
| 型号： | PT4741C |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 4-OUTPUT 70 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | SMD-26/19 |
| 文件页数： | 12/14页 |
| 文件大小： | 321K |
| 代理商： | PT4741C |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Adjusting the Output Voltages of the PT4701 &
PT4741 Quad-Output DC/DC Converters
The PT4741 quad-output DC/DC converter produces
two pairs of balanced ±Vo complimentary output voltages.
The magnitude of each balanced pair of outputs may be
adjusted higher or lower by up to ±10%. The adjustment
method uses a single external resistor 1, which adjusts the
magnitude of the respective +Vo and –Vo simultaneously.
The value of the resistor determines the magnitude of
adjustment, and the placement of the resistor determines the
direction of adjustment (increase or decrease). The resistor
values can be calculated using the appropriate formula
(see below). The formula constants are provided in
Table 3-2. Alternatively the resistor value may be selected
directly from Table 3-3 and Table 3-4, for ±Vo1 and ±Vo2
respectively. The placement of each resistor is as follows.
Adjust Up:
To increase the magnitude of the complimentary
output voltages, add a resistor R1 between the appropriate
±Vox Adj (‘±Vo1 Adj’ or ‘±Vo2 Adj’) and the -Vox voltage rail.
See Figure 3-1(a) and Table 3-1 for the resistor placement
and pin connections.
Figure 3-1b
PT4741
Calculation of Resistor Adjust Values
The adjust resistor value may also be calculated using an
equation. Note that the equation for R1 [Adjust Up] is
different to that for (R2) [Adjust Down].
R1 [Adjust Up]
=
2 Vr Ro
– Rs
k
Va – Vo
(R2) [Adjust Down] =
Ro (2 Va – Vr ) – R
s
k
2 (Vo – Va )
Where: Vo = Original output voltage (±Vox)
Va = Adjusted output voltage (±Vax)
Vr = The reference voltage from Table 3-2
Ro = The resistance value in Table 3-2
Rs = The series resistance from Table 3-2
(R
2)
+Vo
x
±V
x Adj
+Vo
x
PT4741
#
# - See Table 3-1 for pin connections,
where ±Vo
x indicates ±Vo 1, or ±Vo 2
–Vo
x
–Vo
x
To adjust the
magnitude of a +V
o
& –V
o pair lower
COM
Figure 3-1a
R
1
To adjust the
magnitude of a +V
o
& –V
o pair higher
# - See Table 3-1 for pin connections,
where ±Vo
x indicates ±Vo 1, or ±Vo 2
+Vo
x
±V
x Adj
+Vo
x
PT4741
#
–Vo
x
–Vo
x
COM
Adjust Down:
To decrease the magnitude of the compli-
mentary output voltages, add a resistor (R2), between the
appropriate Vox Adj (Vo1 Adj or Vo2 Adj,) and the +Vox
voltage rail. See Figure 3-1(b) and Table 3-1 for the
resistor placement and pin connections.
Table 3-1; Adjust Resistor Pin Connections
To Adjust Up
To Adjust Down
Connect R1
Connect (R2)
from
to
from
to
±Vox Adj
–Vox
±Vox Adj
+Vox
±Vo1
21
20
21
18
±Vo2
26
25
26
23
Notes:
1. Use only a single 1% (or better) tolerance resistor in
either the R1 or (R2) location to adjust a specific output.
Place the resistor as close to the ISR as possible.
2. Never connect capacitors to any of the ‘Vox Adj’ pins. Any
capacitance added to these control pins will affect the
stability of the respective regulated output.
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