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參數(shù)資料
| 型號： | PT4842 |
| 英文描述： | 12V/3.3V/1.8V 48V-Input 62-Watt Triple-Output DC/DC Converter |
| 中文描述： | 12V/3.3V/1.8V 48V的輸入62瓦三輸出DC / DC變換器 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大小： | 216K |
| 代理商： | PT4842 |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT4840 Series
Figure 3; Vo
1
, Vo
2
, Vo
3
Power-Up Sequence
On/Off Output Voltage Sequencing
The Vo
2
and Vo
3
low-voltage outputs from the PT4840
series of DC/DC converters are internally sequenced to
meet the power-up requirements of popular micropro-
cessor and DSP chipsets. Figure 3 shows the waveforms
from a PT4841 after power is applied to the input of the
converter. During power-up, the Vo
1
reaches its output
regulation voltage first, followed the Vo
2
and Vo
3
voltages.
The Vo
2
and Vo
3
voltage waveforms typically track within
0.4V prior to Vo
2
reaching regulation. The waveforms
were measured with resistive loads of 2A, 3A, and 3A, at
Vo1, Vo2, and Vo3 respectively. The input source volt-
age was 48-VDC. The converter typically produces a
fully regulated output within 25ms.
Using the On/Off Enable Controls on the PT4840
Series of Triple Output DC/DC Converters
The PT4840 (48V input) series of 65-W, triple-output
DC/DC converters incorporate two output enable controls.
EN1 (pin 3) is the
Negative Enable
input, and EN2 (pin 4)
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 70V can be safely
applied to the either of the
Enable
pins.
Automatic (UVLO) Power-Up
Connecting EN1 (pin 3) to -V
in
(pin 2) and leaving EN2
(pin 4) 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 3) to -V
in
(pin 2), and apply the
system On/Off control signal to EN2 (pin 4). In this
configuration, a low-level input voltage (-V
in
potential)
applied to pin 4 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 4) is left open circuit, and the system On/Off
control signal is applied to EN1 (pin 3). 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
4
3
2
BSS138
DC/DC
Module
EN 1*
EN 2
–
Vin
–
V
IN
1 =Outputs On
4
3
2
BSS138
Figure 2; Negative Enable Configuration
Figure 1; Positive Enable Configuration
During turn-off, all outputs drop rapidly due to the
discharging effect of actively switched rectifiers. The
voltage at Vo
2
remains higher than Vo
3
during this
period. The discharge time is typically 100μs, but will
vary with the amount of external load capacitance.
pin 3 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 (5V/Div)
Vo2 (1V/Div)
Vo3 (1V/Div)
HORIZ SCALE: 2ms/Div
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PT4842A | 55V Single N-Channel HEXFET Power MOSFET in a D2-Pak package; Similar to IRF1405S with Lead Free Packaging |
| PT4842C | DC to DC Converter |
| PT4842N | DC to DC Converter |
| PT5541 | A 25V Single N-Channel HEXFET Power MOSFET in a DirectFET SQ package rated at 59 amperes optimized with low on resistance for applications such as active OR'ing. Shipped in Tape and Reel only. Part is not available in bulk, TR is implied in part number.; A IRF6622 with Standard Tape and Reel Quantity of 4800 |
| PT5542 | A 25V Single N-Channel HEXFET Power MOSFET in a DirectFET SQ package rated at 59 amperes optimized with low on resistance for applications such as active OR'ing. Shipped in Tape and Reel only. Part is not available in bulk, TR is implied in part number.; Similar to IRF6622 qualified for use with lead free solder shipped in tape and reel 4800 pieces |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT4842A | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 12/3.3/1.8V 48V-Inp 62W 3-Out DC-DC 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 |
| PT4842C | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 12/3.3/1.8V 48V-Inp 62W 3-Out DC-DC 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 |
| PT4842N | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 12/3.3/1.8V 48V-Inp 62W 3-Out DC-DC 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 |
| PT4850 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:25-A Triple Output Isolated DC/DC Converter For Logic Applications |
| PT4850F | 制造商:SHARP 制造商全稱:Sharp Electrionic Components 功能描述:Thin Type Phototransistor |
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