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參數(shù)資料
| 型號(hào)： | PT4701 |
| 英文描述： | 150V Single N-Channel HEXFET Power MOSFET in a SO-8 package; A IRF7451 with Standard Packaging |
| 中文描述： | 35鎢四路輸出。 48 - V輸入直流/直流轉(zhuǎn)換器的DSL線路驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 9/13頁(yè) |
| 文件大小： | 345K |
| 代理商： | PT4701 |
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Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT4701
Figure 3; PT4701 Power-up Sequence
On/Off Output Voltage Sequencing
The PT4701 converter power-up characteristics meet
the requirements of Texas Instruments’ TNETD7112
dual-channel line-interface driver/receiver ICs. All four
outputs from the converter are internally sequenced to
power up in unison. Figure 3 shows the waveforms from
a PT4701 following the application of power. There is a
delay of appoximately 25 ms from the application power
to the point that the output voltages begin to rise. The
converter typically produces a fully regulated output
within 75 ms.The waveforms of Figure 3 were measured
with loads of approximately 50% on each output, with
an input source of 48 VDC.
Using the On/Off Enable Controls on the PT4701
Quad-Output DC/DC Converter
The PT4701 is a quad-output DC/DC converter that is
specifically designed for powering DSL line driver ICs.
The converter incorporates two output enable controls.
EN1 (pin 4) is the
Negative Enable
input, and EN2 (pin 3)
is the
Positive Enable
input. Both inputs are electrically
referenced to –V
in
(pin 2) on the primary or input side of
the converter. A pull-up resistor is not required, but may
be added if desired. Voltages of up to 70 V can be safely
applied to the either of the
Enable
pins.
Automatic (UVLO) Power-Up
Connecting EN1 (pin 4) to -V
in
(pin 2) and leaving EN2
(pin 3) open-circuit configures the converter for auto-
matic power up. (See data sheet “Typical Application”).
The converter control circuitry incorporates an “Under
Voltage Lockout” (UVLO) function, which disables the
converter until the minimum specified input voltage is
present at ±V
in
. (See data sheet Specifications). The UVLO
circuitry ensures a clean transition during power-up and
power-down, allowing the converter to tolerate a slow-
rising input voltage. For most applications EN1 and
EN2, can be configured for automatic power-up.
Positive Output Enable (Negative Inhibit)
To configure the converter for a positive enable func-
tion, connect EN1 (pin 4) to -V
in
(pin 2), and apply the
system On/Off control signal to EN2 (pin 3). In this
configuration, a low-level input voltage (-V
in
potential)
applied to pin 3 disables the converter outputs. Figure 1
is an example of this configuration.
Negative Output Enable (Positive Inhibit)
To configure the converter for a negative enable function,
EN2 (pin 3) is left open circuit, and the system On/Off
control signal is applied to EN1 (pin 4). A low-level
input voltage (-V
in
potential) must then be applied to
DC/DC
Module
EN 1*
EN 2
–
Vin
–
V
IN
1 =Outputs Off
3
4
2
BSS138
DC/DC
Module
EN 1*
EN 2
–
Vin
–
V
IN
1 =Outputs On
3
4
2
BSS138
Figure 2; Negative Enable Configuration
Figure 1; Positive Enable Configuration
pin 4 in order to enable the outputs of the converter.
An example of this configuration is detailed in Figure 2.
Note: The converter will only produce and output voltage if a
valid input voltage is applied to ±V
in
.
+Vo1 (2V/Div)
+Vo2 (2V/Div)
–
Vo2 (2V/Div)
–
Vo1 (2V/Div)
HORIZ SCALE: 10ms/Div
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT4701A | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 35W Quad-Outp 48V Inpt DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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 |
| PT4701C | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 35W Quad-Outp 48V Inpt DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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 |
| PT4701N | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 35W Quad-Outp 48V Inpt DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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 |
| PT4711 | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:45-W Dual-Output Isolated DC/DC Converter |
| PT4711A | 功能描述:DC/DC轉(zhuǎn)換器 45W Dual 15V Out 48V Inpt Iso DC/DC Cnvtr RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱(chēng)）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
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