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參數(shù)資料
| 型號： | PT4521 |
| 英文描述： | 40V Single N-Channel HEXFET Power MOSFET in a I-Pak package; A IRLU3114ZPBF with Standard Packaging |
| 中文描述： | 3.3 5A條48V的輸入隔離DC - DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大小： | 192K |
| 代理商： | PT4521 |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT4500/PT4520 Series
Operating Features and System Considerations for
the PT4500/PT4520 DC/DC Converters
Output Current Limit
The PT4500 and PT4520 series of DC/DC converters
incorporate an output current limit. This protects both the
module and upstream source against load faults. Applying
a load, in excess of the current limit threshold, will sim-
ply cause the output voltage to drop. The output current
remains limited, but continues to flow in the fault. The
drop in output voltage will vary according to the severity
of the fault. Applying a short circuit to the output will
result in an output voltage of zero, and the fault current
will be limited to a value slightly higher than the current
limit threshold. Upon the removal of the load fault, the
output voltage of the module will fully recover to its
normal regulated output voltage.
Primary-Secondary Isolation
The PT4500 and PT4520 series of DC/DC converters
incorporate electrical isolation between the input termi-
nals (primary) and the output terminals (secondary). All
converters are production tested to a withstand voltage
of 1500VDC. The isolation complies with UL60950 and
EN60950, and the requirements for operational isolation.
This allows the converter to be configured for either a
positive or negative input voltage source.
Output Voltage Adjustment
The output voltage is typcially adjustable over a range of
±10% of nominal. Consult the separate application note,
“Ajusting the Output Voltage of the PT4500/PT4520
Series of Isolated DC/DC Converters.”
Remote On/Off Function
The output voltage from the converter can be turned off
from the primary side using the
Remote On/Off
control
(pin 1). Consult the separate application note, “Using
the Remote On/Off Function on the PT4500/PT4520
Series of Isolated DC/DC Converters.”
Under-Voltage Lock-Out
The Under-Voltage Lock-Out (UVLO) circuit prevents
operation of the converter whenever the input voltage to
the module is insufficient to maintain output regulation.
Below the UVLO threshold the module is off and the
Remote On/Off
control (pin 1) is inoperative. Table 1-2
gives the applicable UVLO thresholds.
Table 1-2; UVLO Thresholds
Series
UVLO Threshold
PT4520
31V Typical
PT4500
16.5V Typical
V
in
Range
36 – 75V
18 – 40V
Turn-On Time
The typical turn-on time is typically 35 milliseconds at
V
in
=48V. This is from application of input power, or the
removal of a low-voltage signal from the
Remote On/Off
(pin 1). This includes about about 5–10ms of delay time
before the output voltage begins to rise. Turn-on time
will vary slightly with input voltage, output load, and the
total amount of capacitance connected to the output.
Input Current Limiting
The converter is not internally fused.
For safety and
overall system protection, the maximum input current to
the converter must be limited. Active or passive current
limiting can be used. Passive current limiting can be a
fast acting fuse. A 125-V fuse, rated no more than 5A, is
recommended. Active current limiting can be imple-
mented with a current limited “Hot-Swap” controller.
Thermal Considerations
Airflow may be necessary to ensure that the module can
supply the desired load current in environments with
elevated ambient temperatures. The required airflow
rate may be determined from the Safe Operating Area
(SOA) thermal derating curves. These are provided in
the “Typical Characteristics” section of the converter
specifications.
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| PT4526 | 1.5V 5A 48V-Input Isolated DC-DC Converter |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PT4521A | 功能描述:DC/DC轉(zhuǎn)換器 3.3V 5A 48V-Input Iso DC-DC Converter 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）: 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: |
| PT4521C | 功能描述:DC/DC轉(zhuǎn)換器 3.3V 5A 48V-Input Iso DC-DC Converter 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）: 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: |
| PT4521N | 功能描述:CONVERTER DC-DC 3.3VIN 5.0A VRT RoHS:是 類別:電源 - 板載 >> DC DC Converters 系列:PT4520 標(biāo)準(zhǔn)包裝:10 系列:PT4570 類型:隔離 輸出數(shù):1 電壓 - 輸入（最?。?36V 電壓 - 輸入（最大）:75V Voltage - Output 1:9V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:3.3A 電源（瓦） - 制造商系列:30W 電壓 - 隔離:1.5kV（1500V） 特點(diǎn):- 安裝類型:表面貼裝 封裝/外殼:19-SIP SMD 模塊 尺寸/尺寸:3.00" L x 1.19" W x 0.50" H（76.2mm x 30.2mm x 12.7mm） 包裝:托盤 工作溫度:-40°C ~ 85°C 效率:84% 電源（瓦特）- 最大:30W |
| PT4522 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:20-W 48-V Input Isolated DC/DC Converter |
| PT4522A | 功能描述:DC/DC轉(zhuǎn)換器 5.0V 20W 48V-Input Iso DC/DC Converter 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）: 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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