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參數(shù)資料
| 型號： | PT4741 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | "70-W Quad-Output DC/DC converter for DSL |
| 中文描述： | 70W 四路輸出 48V 輸入的 DC/DC 轉(zhuǎn)換器，用于 DSL 線路驅(qū)動器 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 180K |
| 代理商： | PT4741 |
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 ±V
o
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 +V
o
and –V
o
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 ±Vo
1
and ±Vo
2
respectively. The placement of each resistor is as follows.
Adjust Up:
To increase the magnitude of the complimentary
output voltages, add a resistor R
1
between the appropriate
±Vo
x
Adj
(‘±Vo
1
Adj’ or ‘±Vo
2
Adj’) and the
-Vo
x
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 R
1
[Adjust Up] is
different to that for
(R
2
)
[Adjust Down].
R
1
[Adjust Up]
=
2 V
r
R
o
V
a
– V
o
– R
s
k
(R
2
)
[Adjust Down]
=
R
o
(2 V
a
– V
r
) – R
s
2 (V
o
– V
a
)
k
Where: V
o
= Original output voltage (±Vo
x
)
V
a
= Adjusted output voltage (±Va
x
)
V
r
= The reference voltage from Table 3-2
R
o
= The resistance value in Table 3-2
R
s
= 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
(R
2
)
, between the
appropriate
Vo
x
Adj
(Vo
1
Adj or Vo
2
Adj,) and the
+Vo
x
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
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
21
26
20
25
21
26
18
23
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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| PT4741A | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 70W Quad-Outp 48V Inpt DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| PT4741C | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 70W Quad-Outp 48V Inpt DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| PT4741N | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 70W Quad-Outp 48V Inpt DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| PT4-8 | 制造商:WM BERG 功能描述: |
| PT480 | 功能描述:PHOTO TRANS CLEAR LEN 800NM SIDE RoHS:否 類別:傳感器，轉(zhuǎn)換器 >> 光學(xué) - 光電檢測器 - 光電晶體管 系列:* 標(biāo)準(zhǔn)包裝:1,200 系列:- 電壓 - 集電極發(fā)射極擊穿（最大）:30V 電流 - 集電極 (Ic)（最大）:1mA 電流 - 暗 (Id)（最大）:100nA 波長:880nm 視角:24° 功率 - 最大:100mW 安裝類型:通孔 方向:頂視圖 封裝/外殼:徑向 |
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